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Rules for Classification of Offshore Drilling and Support Units


OFFSHORE SERVICE SPECIFICATION

DNV-OSS-101

Rules for Classification of Offshore Drilling and Support Units
OCTOBER 2014

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DET NORSKE VERITAS AS

FOREWORD
DNV is a global provider of knowledge for managing risk. Today, safe and responsible business conduct is both a license to operate and a competitive advantage. Our core competence is to identify, assess, and advise on risk management. From our leading position in certification, classification, verification, and training, we develop and apply standards and best practices. This helps our customers safely and responsibly improve their business performance. DNV is an independent organisation with dedicated risk professionals in more than 100 countries, with the purpose of safeguarding life, property and the environment. DNV service documents consist of among others the following types of documents: — Service Specifications. Procedural requirements. — Standards. Technical requirements. — Recommended Practices. Guidance. The Standards and Recommended Practices are offered within the following areas: A) Qualification, Quality and Safety Methodology B) Materials Technology C) Structures D) Systems E) Special Facilities F) Pipelines and Risers G) Asset Operation H) Marine Operations J) Cleaner Energy O) Subsea Systems U) Unconventional Oil & Gas

? Det Norske Veritas AS October 2014 Any comments may be sent by e-mail to rules@dnv.com

If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that the maximum compensation shall never exceed USD 2 million. In this provision "Det Norske Veritas" shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas.

Offshore Service Specification DNV-OSS-101, October 2014 CHANGES – CURRENT – Page 3

CHANGES – CURRENT
General
This document supersedes DNV-OSS-101, July 2014. Text affected by the main changes in this edition is highlighted in red colour. However, if the changes involve a whole chapter, section or sub-section, normally only the title will be in red colour. Det Norske Veritas AS, company registration number 945 748 931, has on 27th November 2013 changed its name to DNV GL AS. For further information, see www.dnvgl.com. Any reference in this document to “Det Norske Veritas AS” or “DNV” shall therefore also be a reference to “DNV GL AS”.

Main changes, entering into force 1 April 2015
? General This update contains: — a new alternative drilling equipment survey arrangement — further development of alternative survey arrangements applicable for drilling units. ? Ch.3 Sec.3 Periodical survey extent for main class — [1.2] IIP tables have been updated. ? Ch.3 Sec.7 Alternative survey arrangements — Table 7-1: — New survey arrangement (Drilling equipment PMS) has been added. — MPD pressure control system has been added to the table. — New footnote (22) has been added. [2.3]: Minor changes have been made. [2.3.5]: New guidance note on maintenance terminology has been added. [2.4.2]: Prerequisites for PMS RCM to be valid have been added. [2.4.4] to [2.4.7]: New items on maintenance management approval. [2.4.8]: New title has been added and the first item in the table has been revised. [2.4.10] and [2.4.11]: New items regarding Approval of maintenance programme and initial survey. [2.4.12]: Minor changes have been done. [2.4.18]: Text regarding risk based inspection (RBI) as an alternative to NDT have been added. [2.5.10]: Heading has been revised. [3.3]: New alternative survey arrangement: Drilling equipment PMS has been added. [3.4]: More clear definition of the survey arrangement and that it apply to drilling items following the PMS RCM arrangement has been added. — [3.5]: Guidance note: RBI as an alternative to NDT has been added. — [4.3]: Minor changes have been done. — [4.3.3]: More details on survey plan to be developed have been added. — — — — — — — — — — —

Editorial corrections
In addition to the above stated main changes, editorial corrections may have been made.

DET NORSKE VERITAS AS

Offshore Service Specification DNV-OSS-101, October 2014 Contents – Page 4

CONTENTS
CHANGES – CURRENT ................................................................................................................... 3

CH. 1 PRINCIPLES AND PROCEDURES FOR CLASSIFICATION............ 13
Sec. 1 Introduction....................................................................................................................... 13
1 Introduction ............................................................................................................................................. 13 1.1 General........................................................................................................................................... 13 1.2 Organisation................................................................................................................................... 13 1.3 Objects covered.............................................................................................................................. 13 Definitions ................................................................................................................................................ 13 2.1 Verbal forms .................................................................................................................................. 13 2.2 Definitions...................................................................................................................................... 13 Normative references .............................................................................................................................. 18 3.1 Normative references ..................................................................................................................... 18 3.2 DNV reference documents............................................................................................................. 18 3.3 Other references ............................................................................................................................. 18 Informative references............................................................................................................................ 19 4.1 DNV informative references.......................................................................................................... 19 4.2 Other references ............................................................................................................................. 19 Abbreviations........................................................................................................................................... 19 The classification concept ....................................................................................................................... 20 1.1 Introduction.................................................................................................................................... 20 1.2 Applicable rules ............................................................................................................................. 20 1.3 Basis for assignment of class ......................................................................................................... 21 1.4 Basis for maintenance of class....................................................................................................... 21 1.5 Documentation............................................................................................................................... 22 1.6 Disclosure of information .............................................................................................................. 22 1.7 Access ............................................................................................................................................ 23 1.8 Calibration of equipment ............................................................................................................... 23 1.9 Service suppliers ............................................................................................................................ 23 1.10 Limitation of DNV's responsibility................................................................................................ 24 Appeals ..................................................................................................................................................... 24 2.1 Decisions taken by the society ...................................................................................................... 24 Statutory certification ............................................................................................................................. 24 3.1 General .......................................................................................................................................... 24 3.2 Service suppliers ............................................................................................................................ 24 Scope of classification.............................................................................................................................. 25 1.1 General........................................................................................................................................... 25 1.2 Rule parts ....................................................................................................................................... 25 1.3 Rule particulars .............................................................................................................................. 25 Class notations ......................................................................................................................................... 25 2.1 General........................................................................................................................................... 25 2.2 Construction symbols..................................................................................................................... 25 2.3 Main character of class .................................................................................................................. 26 2.4 Basic design notations.................................................................................................................... 26 2.5 Service notations............................................................................................................................ 26 2.6 Optional class notations related to special equipment and systems............................................... 26 2.7 Optional class notations related to cold climate operation ............................................................ 27 2.8 Special feature notations ................................................................................................................ 27 2.9 Service restrictions......................................................................................................................... 28 2.10 Compliance with coastal state legislation ...................................................................................... 28 2.11 Combination of notations............................................................................................................... 28 Assignment of class - new vessels ........................................................................................................... 29 1.1 General........................................................................................................................................... 29 1.2 Requirements for builder or designer ............................................................................................ 29 1.3 Applicable rules ............................................................................................................................. 29 1.4 Plan approval ................................................................................................................................. 31 DET NORSKE VERITAS AS

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Classification principles ................................................................................................... 20
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Classification scope and notations................................................................................... 25
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Assignment of class ........................................................................................................... 29
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1.5 Survey during construction ............................................................................................................ 31 1.6 Installation of systems and equipment........................................................................................... 31 1.7 Testing and commissioning ........................................................................................................... 31 Assignment of class - existing vessels..................................................................................................... 32 2.1 General........................................................................................................................................... 32 2.2 Applicable rules ............................................................................................................................. 32 2.3 Design approval ............................................................................................................................. 32 2.4 Class entry survey .......................................................................................................................... 32 The class certificate ................................................................................................................................. 32 3.1 General........................................................................................................................................... 32 3.2 Late commissioning ....................................................................................................................... 33 The register of vessels ............................................................................................................................. 33 4.1 General........................................................................................................................................... 33 Conditions for retention of class ............................................................................................................ 34 1.1 General requirements ..................................................................................................................... 34 1.2 The customer’s obligations ............................................................................................................ 34 1.3 Maintenance................................................................................................................................... 34 Classification society involvement ......................................................................................................... 35 2.1 Applicable rules ............................................................................................................................. 35 2.2 Surveys........................................................................................................................................... 35 2.3 Conditions and memoranda ........................................................................................................... 35 2.4 Survey reports and survey status.................................................................................................... 36 2.5 Damage and repairs........................................................................................................................ 36 2.6 Conversions and alterations ........................................................................................................... 37 2.7 Temporary equipment.................................................................................................................... 37 Endorsement and renewal of the class certificate ................................................................................ 37 3.1 Endorsement of the class certificate .............................................................................................. 37 3.2 Renewal of the class certificate...................................................................................................... 38 Suspension and withdrawal of class ...................................................................................................... 38 4.1 General........................................................................................................................................... 38 4.2 Suspension of class ........................................................................................................................ 39 4.3 Reinstatement following class suspension..................................................................................... 39 4.4 Withdrawal of class........................................................................................................................ 39 4.5 Re-assignment of class following class withdrawal ...................................................................... 40 Change of owner or manager................................................................................................................. 40 5.1 General........................................................................................................................................... 40 Force majeure.......................................................................................................................................... 40 General ..................................................................................................................................................... 41 1.1 General........................................................................................................................................... 41 1.2 Requirements for manufacturer ..................................................................................................... 41 The classification involvement ............................................................................................................... 41 2.1 General........................................................................................................................................... 41 2.2 Plan approval ................................................................................................................................. 42 2.3 Type approval ................................................................................................................................ 42 2.4 Survey ............................................................................................................................................ 43 2.5 Manufacturing survey arrangement ............................................................................................... 43 Suspension and withdrawal of certificates............................................................................................ 43 3.1 General........................................................................................................................................... 43 Liability and jurisdiction ........................................................................................................................ 44 1.1 Limited liability ............................................................................................................................. 44 1.2 Use by other parties ....................................................................................................................... 44 1.3 Governing law................................................................................................................................ 44 1.4 Venue ............................................................................................................................................. 44

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Retention of class .............................................................................................................. 34
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Certification of materials, components and systems ..................................................... 41
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Legal provisions ................................................................................................................ 44
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CH. 2 DESIGN AND CONSTRUCTION PROVISIONS................................... 45
Sec. 1 Design and construction requirements for 1A1 MOU main class................................ 45
1 General ..................................................................................................................................................... 45 DET NORSKE VERITAS AS

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1.1 Introduction.................................................................................................................................... 45 1.2 Technical reference documents...................................................................................................... 45 1.3 General assumptions ...................................................................................................................... 45 Safety principles and arrangement........................................................................................................ 46 2.1 General........................................................................................................................................... 46 2.2 Design principles ........................................................................................................................... 46 2.3 Arrangement .................................................................................................................................. 46 2.4 Escape and evacuation ................................................................................................................... 46 Materials .................................................................................................................................................. 46 3.1 Technical requirements.................................................................................................................. 46 3.2 Supplementary classification requirements ................................................................................... 46 Structural design ..................................................................................................................................... 46 4.1 Scope.............................................................................................................................................. 46 4.2 Technical requirements.................................................................................................................. 47 Fabrication and testing of offshore structures ..................................................................................... 47 5.1 Technical requirements.................................................................................................................. 47 5.2 Supplementary classification requirements ................................................................................... 47 Stability and watertight/weathertight integrity.................................................................................... 47 6.1 Technical requirements.................................................................................................................. 47 Mooring and towing ................................................................................................................................ 47 7.1 General........................................................................................................................................... 47 7.2 Temporary mooring ...................................................................................................................... 48 7.3 Towing ........................................................................................................................................... 48 7.4 Supplementary classification requirements ................................................................................... 48 Marine and machinery systems and equipment................................................................................... 48 8.1 Technical requirements.................................................................................................................. 48 8.2 Supplementary classification requirements ................................................................................... 48 Electrical systems and equipment.......................................................................................................... 48 9.1 Supplementary classification requirements ................................................................................... 49 Instrumentation and telecommunication systems................................................................................ 49 10.1 Technical requirements.................................................................................................................. 49 10.2 Supplementary classification requirements ................................................................................... 49 Fire protection ......................................................................................................................................... 49 11.1 Technical requirements.................................................................................................................. 49 11.2 Supplementary classification requirements ................................................................................... 49 Preparation for surveys and inspections on location ........................................................................... 49 12.1 General........................................................................................................................................... 49 Summary of technical reference standards .......................................................................................... 51 General ..................................................................................................................................................... 52 1.1 Introduction.................................................................................................................................... 52 1.2 Scope.............................................................................................................................................. 52 Safety principles and arrangement........................................................................................................ 52 2.1 General........................................................................................................................................... 52 2.2 Arrangement ................................................................................................................................. 52 2.3 Area classification.......................................................................................................................... 52 2.4 Emergency shutdown..................................................................................................................... 52 2.5 Escape, evacuation and communication ........................................................................................ 52 Structural design ..................................................................................................................................... 52 3.1 General........................................................................................................................................... 52 Fire protection ......................................................................................................................................... 53 4.1 General........................................................................................................................................... 53 4.2 Supplementary technical requirements .......................................................................................... 53 Mooring .................................................................................................................................................... 53 Summary of requirements...................................................................................................................... 53 General ..................................................................................................................................................... 54 1.1 Introduction.................................................................................................................................... 54 General requirements ............................................................................................................................. 54 2.1 Structural design ............................................................................................................................ 54 DET NORSKE VERITAS AS

Sec. 2

Supplementary requirements for drilling units ............................................................. 52
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Supplementary requirements for well intervention units ............................................. 54
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2.2 Position keeping............................................................................................................................. 54 Requirements for Well Intervention Unit 1 ....................................................................................... 54 3.1 General........................................................................................................................................... 54 3.2 Supplementary requirements ......................................................................................................... 55 Requirements for Well Intervention Unit 2 ....................................................................................... 55 4.1 General........................................................................................................................................... 55 4.2 Arrangement .................................................................................................................................. 55 4.3 Area classification.......................................................................................................................... 55 4.4 Emergency shutdown..................................................................................................................... 55 4.5 Escape, evacuation and communication ........................................................................................ 55 4.6 Fire Protection................................................................................................................................ 55 4.7 Supplementary classification requirements ................................................................................... 56 General ..................................................................................................................................................... 57 1.1 Introduction.................................................................................................................................... 57 Safety principles and arrangement........................................................................................................ 57 2.1 Emergency shutdown..................................................................................................................... 57 Structural strength.................................................................................................................................. 57 3.1 General........................................................................................................................................... 57 3.2 Design loads................................................................................................................................... 57 3.3 Containerised modules................................................................................................................... 57 3.4 Gangways....................................................................................................................................... 57 Electrical systems and equipment.......................................................................................................... 57 4.1 Emergency source of power and emergency installation .............................................................. 57 Position keeping....................................................................................................................................... 58 Introduction ............................................................................................................................................. 59 1.1 Objective ........................................................................................................................................ 59 1.2 Safety principles - Emergency shutdown ...................................................................................... 59 Structural design ..................................................................................................................................... 59 2.1 General........................................................................................................................................... 59 2.2 Technical requirements.................................................................................................................. 59 Stability and watertight integrity........................................................................................................... 59 Certification of materials and components........................................................................................... 59 General ..................................................................................................................................................... 60 1.1 Introduction.................................................................................................................................... 60 General requirements for Wind Turbine Installation Unit ............................................................. 60 2.1 Column-stabilised or self-elevating units ...................................................................................... 60 2.2 Non self-elevating vessel ............................................................................................................... 60 Crane installations................................................................................................................................... 60 Introduction ............................................................................................................................................. 61 1.1 General........................................................................................................................................... 61 1.2 Technical reference documents...................................................................................................... 61 1.3 General assumptions ...................................................................................................................... 61 Enhanced systems.................................................................................................................................... 61 2.1 General........................................................................................................................................... 61 2.2 Technical requirements.................................................................................................................. 61 2.3 Certification of materials and components .................................................................................... 61 Position mooring system ......................................................................................................................... 62 3.1 General........................................................................................................................................... 62 3.2 Application..................................................................................................................................... 62 3.3 Technical requirements.................................................................................................................. 62 3.4 Certification of materials and components .................................................................................... 62 Dynamic positioning systems.................................................................................................................. 63 4.1 General........................................................................................................................................... 63 4.2 Technical requirements.................................................................................................................. 63 4.3 Certification of materials and components ................................................................................... 63 DET NORSKE VERITAS AS

Sec. 4

Supplementary requirements for accommodation units............................................... 57
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Supplementary requirements for crane units ................................................................ 59
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Supplementary requirements for wind turbine installation units................................ 60
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Optional class notations.................................................................................................... 61
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Drilling plant............................................................................................................................................ 64 5.1 General........................................................................................................................................... 64 5.2 Technical requirements.................................................................................................................. 64 5.3 Certification of materials and components .................................................................................... 64 5.4 DRILL(US).................................................................................................................................... 64 Helicopter decks ...................................................................................................................................... 65 6.1 General........................................................................................................................................... 65 6.2 Technical requirements.................................................................................................................. 65 6.3 Certification of materials and components ................................................................................... 65 Well testing facilities ............................................................................................................................... 65 7.1 General........................................................................................................................................... 65 7.2 Technical requirements.................................................................................................................. 66 7.3 Certification of materials and components .................................................................................... 66 Temporary oil storage facilities ............................................................................................................. 66 8.1 General........................................................................................................................................... 66 8.2 Technical requirements.................................................................................................................. 67 8.3 Certification of materials and components .................................................................................... 67 Crane installations .................................................................................................................................. 67 9.1 General........................................................................................................................................... 67 9.2 Technical requirements.................................................................................................................. 67 9.3 Certification of materials and components .................................................................................... 67 Diving system installations .................................................................................................................... 67 10.1 General........................................................................................................................................... 67 10.2 Technical requirements.................................................................................................................. 68 10.3 Certification of materials and components .................................................................................... 68 Additional fire protection ...................................................................................................................... 68 11.1 General........................................................................................................................................... 68 11.2 Technical requirements.................................................................................................................. 69 11.3 Certification of materials and components .................................................................................... 69 Loading computer .................................................................................................................................. 69 12.1 General........................................................................................................................................... 69 12.2 Technical requirements.................................................................................................................. 69 12.3 Certification of materials and components .................................................................................... 69 Periodically unattended machinery space............................................................................................. 69 13.1 General........................................................................................................................................... 69 13.2 Technical requirements.................................................................................................................. 69 13.3 Certification of materials and components .................................................................................... 70 Well intervention system ........................................................................................................................ 70 14.1 General........................................................................................................................................... 70 14.2 Technical requirements.................................................................................................................. 70 14.3 Certification of materials and components ................................................................................... 70 Hull monitoring system........................................................................................................................... 71 15.1 General........................................................................................................................................... 71 15.2 Technical requirements.................................................................................................................. 71 Fatigue methodology for ship-shaped units .......................................................................................... 71 16.1 General........................................................................................................................................... 71 16.2 Technical requirements.................................................................................................................. 71 Noise, vibration and comfort rating notations...................................................................................... 71 17.1 General........................................................................................................................................... 71 17.2 Technical requirements.................................................................................................................. 72 17.3 Certification requirements ............................................................................................................. 72 Cold climate notations ............................................................................................................................ 72 18.1 General........................................................................................................................................... 72 18.2 Structural strength ......................................................................................................................... 72 18.3 Winterized...................................................................................................................................... 74 Environmental notations ........................................................................................................................ 74 19.1 General........................................................................................................................................... 74 19.2 Objective ........................................................................................................................................ 74 19.3 Technical requirements.................................................................................................................. 75 Enhanced system verification................................................................................................................. 75 20.1 General........................................................................................................................................... 75 20.2 Technical requirements.................................................................................................................. 76 20.3 Certification requirements ............................................................................................................. 76 DET NORSKE VERITAS AS

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21 Integrated software dependent systems ................................................................................................ 76 21.1 General........................................................................................................................................... 76 21.2 Technical requirements.................................................................................................................. 76 21.3 Certification requirements ............................................................................................................. 76 22 Special feature notations......................................................................................................................... 76 22.1 General........................................................................................................................................... 76 22.2 (NON-)SELF PROPELLED ...................................................................................................... 77 22.3 Tailshaft monitoring – TMON ....................................................................................................... 77 22.4 Special feature notation BIS ......................................................................................................... 77 23 Summary of reference documents for additional class notations ....................................................... 77

CH. 3 CLASSIFICATION IN OPERATION ...................................................... 79
Sec. 1 General provisions ........................................................................................................... 79
1 Introduction ............................................................................................................................................. 79 1.1 General........................................................................................................................................... 79 1.2 Survey pre-planning and record keeping ....................................................................................... 79 1.3 Alternative survey arrangements ................................................................................................... 79 1.4 Surveys performed by approved companies .................................................................................. 79 Periodical surveys.................................................................................................................................... 79 2.1 General........................................................................................................................................... 79 2.2 Postponement of periodical surveys .............................................................................................. 80 2.3 Survey of units out of commission ................................................................................................ 80 2.4 Survey Schedules ........................................................................................................................... 81 2.5 Class notations ............................................................................................................................... 82 General ..................................................................................................................................................... 84 1.1 Preparation for survey.................................................................................................................... 84 Hull and equipment................................................................................................................................. 84 2.1 Conditions for survey and access to structures .............................................................................. 84 2.2 Survey extent ................................................................................................................................ 85 2.3 Repair of structural damage or deterioration ................................................................................. 86 Machinery and systems .......................................................................................................................... 87 3.1 Maintenance and preparation for survey........................................................................................ 87 3.2 Machinery verification................................................................................................................... 87 Special provisions for ageing offshore units ......................................................................................... 87 4.1 General........................................................................................................................................... 87 4.2 Corrosion measurements and condition of protective coating ...................................................... 88 4.3 Fatigue utilization index ................................................................................................................ 88 General ..................................................................................................................................................... 90 1.1 Introduction.................................................................................................................................... 90 1.2 In-service inspection program........................................................................................................ 90 Annual survey.......................................................................................................................................... 94 2.1 Survey extent ................................................................................................................................. 94 2.2 Structure and equipment, general ............................................................................................... 94 2.3 Structure and equipment, type specific.......................................................................................... 96 2.4 Machinery and safety systems ...................................................................................................... 96 Intermediate survey ................................................................................................................................ 98 3.1 General........................................................................................................................................... 98 3.2 Structure and equipment ............................................................................................................... 98 3.3 Machinery and safety systems - all units ..................................................................................... 99 Renewal survey, structure and equipment ........................................................................................... 99 4.1 General........................................................................................................................................... 99 4.2 All units ....................................................................................................................................... 100 4.3 Specific requirements for ship-shaped units ................................................................................ 103 4.4 Specific requirements for column-stabilised units....................................................................... 104 4.5 Specific requirements for self-elevating units ............................................................................. 106 4.6 Specific requirements for units of other shape ............................................................................ 109 Renewal survey, machinery and systems ............................................................................................ 109 5.1 General......................................................................................................................................... 109 5.2 Machinery .................................................................................................................................... 109 5.3 Electrical installations.................................................................................................................. 110 DET NORSKE VERITAS AS

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General requirements for structure and machinery surveys ....................................... 84
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Periodical survey extent for main class........................................................................... 90
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Safety and control systems........................................................................................................... 111

Sec. 4

Miscellaneous main class surveys.................................................................................. 112
1 2 Propeller shaft survey .......................................................................................................................... 112 1.1 General......................................................................................................................................... 112 Propeller connection survey ................................................................................................................. 112 2.1 General......................................................................................................................................... 112 2.2 Dismantling of propellers ............................................................................................................ 113 Survey of geared thrusters for main propulsion and positioning..................................................... 113 3.1 Definitions.................................................................................................................................... 113 3.2 Survey extent ............................................................................................................................... 113 Survey of podded thrusters for main propulsion and positioning.................................................... 113 4.1 General......................................................................................................................................... 113 4.2 Scheduled surveys........................................................................................................................ 114 Boiler survey .......................................................................................................................................... 114 Thermal oil heater survey..................................................................................................................... 114 Survey of the unit's bottom and related items.................................................................................... 114 7.1 Schedule ...................................................................................................................................... 114 7.2 Survey planning and record keeping ........................................................................................... 114 7.3 Ship-shaped units (ship or barge type units)................................................................................ 114 7.4 Column-stabilised units ............................................................................................................... 114 7.5 Self-elevating units ...................................................................................................................... 114 Survey of towing, temporary and position mooring equipment ....................................................... 115 8.1 Types of survey............................................................................................................................ 115 8.2 Annual survey .............................................................................................................................. 115 8.3 Renewal survey............................................................................................................................ 115 Introduction ........................................................................................................................................... 118 Drilling units .......................................................................................................................................... 118 2.1 Introduction.................................................................................................................................. 118 2.2 Annual survey .............................................................................................................................. 118 2.3 Complete survey .......................................................................................................................... 118 Well intervention units.......................................................................................................................... 119 3.1 Introduction.................................................................................................................................. 119 3.2 Annual survey .............................................................................................................................. 119 3.3 Complete survey .......................................................................................................................... 119 Accommodation unit ............................................................................................................................. 119 4.1 Introduction.................................................................................................................................. 119 4.2 Annual survey .............................................................................................................................. 119 4.3 Complete survey .......................................................................................................................... 119 Crane unit .............................................................................................................................................. 120 5.1 Introduction.................................................................................................................................. 120 5.2 Annual survey .............................................................................................................................. 120 5.3 Complete survey .......................................................................................................................... 120 Wind turbine installation vessels ......................................................................................................... 120 6.1 Introduction................................................................................................................................. 120 6.2 Annual survey .............................................................................................................................. 120 6.3 Complete survey .......................................................................................................................... 120 Offshore support vessels ....................................................................................................................... 120 7.1 Introduction................................................................................................................................. 120 Introduction ........................................................................................................................................... 121 1.1 General......................................................................................................................................... 121 Position mooring equipment ................................................................................................................ 121 2.1 Application................................................................................................................................... 121 2.2 Annual survey .............................................................................................................................. 121 2.3 Complete survey .......................................................................................................................... 121 Dynamic positioning systems ............................................................................................................... 121 3.1 General......................................................................................................................................... 121 3.2 Specific requirements................................................................................................................... 121 3.3 Annual and complete survey........................................................................................................ 122 DET NORSKE VERITAS AS

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Periodical survey extent for additional service notations ........................................... 118
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Optional class notation surveys ..................................................................................... 121
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Drilling plant.......................................................................................................................................... 122 4.1 Application................................................................................................................................... 122 4.2 Annual survey .............................................................................................................................. 122 4.3 Complete survey .......................................................................................................................... 125 4.4 DRILL (US) ................................................................................................................................ 130 Helicopter deck...................................................................................................................................... 131 5.1 Application................................................................................................................................... 131 5.2 Complete survey .......................................................................................................................... 131 Well test.................................................................................................................................................. 131 6.1 Application................................................................................................................................... 131 6.2 Annual and complete surveys ...................................................................................................... 131 Temporary oil storage........................................................................................................................... 131 7.1 Application................................................................................................................................... 131 7.2 Annual survey .............................................................................................................................. 131 7.3 Complete survey .......................................................................................................................... 132 Crane ...................................................................................................................................................... 132 8.1 Application................................................................................................................................... 132 8.2 Annual and complete surveys ...................................................................................................... 132 Diving systems ....................................................................................................................................... 132 9.1 Application................................................................................................................................... 132 9.2 Annual, intermediate and complete surveys ................................................................................ 132 Additional fire protection arrangements ............................................................................................ 132 10.1 General......................................................................................................................................... 132 10.2 Complete survey .......................................................................................................................... 132 Loading computers for damage control .............................................................................................. 132 11.1 Application................................................................................................................................... 132 11.2 Annual survey and complete surveys .......................................................................................... 132 Periodically unattended machinery space and machinery centrally operated................................ 132 12.1 Application................................................................................................................................... 132 12.2 Annual and complete surveys ...................................................................................................... 133 Well intervention system ...................................................................................................................... 133 13.1 Application................................................................................................................................... 133 13.2 Annual survey .............................................................................................................................. 133 13.3 Complete survey .......................................................................................................................... 133 Hull monitoring system......................................................................................................................... 134 14.1 Application................................................................................................................................... 134 14.2 Objective ...................................................................................................................................... 134 14.3 Annual survey .............................................................................................................................. 134 Fatigue methodology for ship-shaped mobile offshore units ........................................................... 134 15.1 Application................................................................................................................................... 134 15.2 General......................................................................................................................................... 134 15.3 Survey .......................................................................................................................................... 134 Noise, vibration and comfort rating .................................................................................................... 134 16.1 Application................................................................................................................................... 134 16.2 General......................................................................................................................................... 134 16.3 Complete ...................................................................................................................................... 134 Winterization ......................................................................................................................................... 134 17.1 Application................................................................................................................................... 134 17.2 Annual survey .............................................................................................................................. 134 17.3 Complete survey .......................................................................................................................... 135 Environmental notations ...................................................................................................................... 135 18.1 Ballast water management systems ............................................................................................. 135 18.2 CLEAN or CLEAN DESIGN ......................................................................................... 135 18.3 Recycling ..................................................................................................................................... 135 18.4 Vapour control systems (VCS) .................................................................................................... 136 Integrated software dependent systems .............................................................................................. 136 19.1 General......................................................................................................................................... 136 19.2 Annual survey .............................................................................................................................. 136 19.3 Complete survey .......................................................................................................................... 136 Special feature notations....................................................................................................................... 136 20.1 Non self-propelled units............................................................................................................... 136 20.2 Self-propelled self-elevating units ............................................................................................... 136 20.3 Tailshaft monitoring..................................................................................................................... 137 DET NORSKE VERITAS AS

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Sec. 7

Alternative survey arrangements .................................................................................. 138
1 2 General ................................................................................................................................................... 138 1.1 General......................................................................................................................................... 138 Machinery survey arrangements ......................................................................................................... 142 2.1 General......................................................................................................................................... 142 2.2 Machinery continuous.................................................................................................................. 143 2.3 Machinery planned maintenance system ..................................................................................... 143 2.4 Planned maintenance system - Reliability centered maintenance ............................................... 143 2.5 Offshore condition monitoring .................................................................................................... 147 Drilling equipment survey arrangements ........................................................................................... 149 3.1 General......................................................................................................................................... 149 3.2 Drilling equipment continuous survey arrangement.................................................................... 149 3.3 Drilling equipment planned maintenance system ........................................................................ 150 3.4 Drilling equipment PMS RCM .................................................................................................... 152 3.5 Drilling equipment condition monitoring survey arrangement .................................................. 153 Structural survey arrangements .......................................................................................................... 153 4.1 General......................................................................................................................................... 153 4.2 Structural continuous survey arrangement................................................................................... 153 4.3 Structural integrity management.................................................................................................. 153 Surveys by approved companies.......................................................................................................... 155 1.1 General......................................................................................................................................... 155 1.2 Thickness measurements ............................................................................................................. 155 1.3 Bottom survey afloat.................................................................................................................... 155 1.4 Non-destructive testing ................................................................................................................ 155 1.5 Mooring chain inspections........................................................................................................... 155 1.6 Condition monitoring................................................................................................................... 155 Introduction ............................................................................................................................................ The classification system ....................................................................................................................... Remuneration ......................................................................................................................................... Classification support............................................................................................................................. 157 157 159 159

3

4

Sec. 8

Surveys performed by approved companies ................................................................ 155
1

App. A Introduction to offshore classification ......................................................................... 157
A.1 A.2 A.3 A.4

App. B Mooring equipment acceptance standard guidance .................................................... 160
B.1 General ................................................................................................................................................... 160 B.2 Anchor chains; renewal survey examination guide................................................................................ 160

CHANGES – HISTORIC ............................................................................................................... 163

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CHAPTER 1 PRINCIPLES AND PROCEDURES FOR CLASSIFICATION
SECTION 1 INTRODUCTION
1 Introduction
1.1 General
This publication presents DNV GL’s Rules for Classification of Offshore Drilling and Support Units, the terms and procedures for assigning and maintaining classification, including listing of the applicable technical references to be applied for classification.

1.2 Organisation
DNV-OSS-101 is divided into three main chapters as follows: — Ch.1: providing general information about classification principles and procedures — Ch.2: providing design and construction requirements for the newbuilding phase — Ch.3: providing requirements for maintenance of class in the operational phase.

1.3 Objects covered
DNV-OSS-101 covers classification of mobile offshore units (units) of the following design types: — ship-shaped units — column-stabilised units — self-elevating units for the following services: — — — — — drilling well intervention accommodation heavy-lifting general offshore support.

2 Definitions
2.1 Verbal forms
Term Shall Should Definition Verbal form used to indicate requirements strictly to be followed in order to conform to the document. Verbal form used to indicate that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others, or that a certain course of action is preferred but not necessarily required. Verbal form used to indicate a course of action permissible within the limits of the document.

May

2.2 Definitions
2.2.1 Approval or approved: Denotes acceptance by DNV of documentation showing design solutions, arrangements and equipment that complies with the Rules. 2.2.2 Assessment: An act of assessing, appraising or evaluating a condition of a product, process or system. 2.2.3 Assigning class: Originally signified designation of one of several classes to a vessel based on its condition, ranging from good to bad. Today only the highest class is assigned, comprising the main class, 1A1, and an obligatory additional class notation, e.g. Drilling Unit, where applicable. Voluntary additional class notations may also be assigned covering special service, equipment or systems, e.g. DRILL denoting a classed drilling plant. 2.2.4 BOP: Blow out preventer. 2.2.5 Builder: Signifies the party contracted to build a vessel in compliance with the Society's rules.
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2.2.6 Certificate: A document confirming compliance with the Society's rules or with other rules and regulations for which the Society has been authorized to act. 2.2.7 Certification: A service confirming compliance with applicable requirements on the date that the survey was completed. 2.2.8 Certification of materials and components (CMC): The activity of ensuring that materials, components and systems used in vessels to be classed by the Society comply with the rule requirements. The scope of classification re-quires that specified materials, components and systems intended for the vessel are certified. Depending on the categorisation, certification may include both plan approval and survey during production and/or of the final product. 2.2.9 Class: Class is assigned to and will be retained by vessels complying with applicable requirements of the Society's rules. 2.2.10 Classification: A service which comprises the development of independent technical standards for vessels - class rules and standards, and to verify compliance with the rules and standards throughout the vessels' life. 2.2.11 Close-up examination: An examination where the details of structural components are within the close visual inspection range of the surveyor, i.e. preferably within reach of hand. 2.2.12 Coating conditions: — “GOOD”: Condition with only minor spot rusting. — “FAIR”: Condition with local breakdown at edges of stiffeners and weld connections and/or light rusting over 20% or more of areas under consideration, but less than as defined for POOR condition. — “POOR”: Condition with general breakdown of coating over 20% or more of areas or hard scale at 10% or more of areas under consideration. 2.2.13 Commissioning: A process of assuring that components, equipment and the systems are functioning in accordance with the functional requirements. 2.2.14 Concurrent surveys: Surveys required to be concurrently completed shall have the same date of completion. A survey required to be carried out in conjunction with or carried out as part of another survey shall be completed on or before the completion of the other survey, however, within the time window for that survey. 2.2.15 Condition of Class (CC): Constitutes a requirement that specific measures, repairs or surveys shall be carried out within a specific time limit in order to retain class. 2.2.16 Condition on behalf of the flag administration (CA): Constitutes specific measures, repairs or surveys that shall be carried out within a specific time limit in order to retain the statutory certificate. A CA will be issued only when the Society has been authorised to carry out statutory surveys on behalf of the flag ad-ministration. 2.2.17 Contract: The specific agreement between DNV and the customer. It defines the extent of services requested by the customer, and is concerned with: — the classification of vessels or installations, both new buildings and in operation — statutory work carried out on behalf of national maritime authorities — equipment and materials. 2.2.18 Critical structural areas: Areas that have been identified from calculations to require monitoring or from the service history of the subject vessel or from similar or sister vessels to be sensitive to cracking, buckling or corrosion which would impair the structural integrity of the vessel. 2.2.19 Customer: Signifies the party who has requested the Society's service. 2.2.20 Designer: Signifies a party who creates documentation submitted to the Society for approval or information. 2.2.21 Det Norske Veritas (DNV): An autonomous and independent foundation with the purpose of safeguarding life, property and the environment. The foundation operates through the limited company Det Norske Veritas AS, which is registered in Norway and operates through a worldwide network of offices. 2.2.22 ESD: Emergency Shut Down.
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2.2.23 DP: Design Pressure. 2.2.24 “Exceptional circumstances” means unavailability of dry-docking facilities; unavailability of repair facilities; unavailability of essential materials, equipment or spare parts; or delays incurred by action taken to avoid severe weather conditions. 2.2.25 Emergency towing: Towing related to an emergency situation normally caused by failure of the units own propulsion (compare with normal towing as defined in [2.2.80]). 2.2.26 Flag administration: The maritime administration of a vessel's country of registry. 2.2.27 FMECA: Failure Mode Effect and Consequence Analysis. 2.2.28 FUI: Fatigue Utilisation Factor. 2.2.29 Guidance note: Contain advice which is not mandatory for the assignment or retention of class, but with which the Society, in light of general experience, advises compliance. 2.2.30 IACS: The International Association of Classification Societies. Unified rules, interpretations, guidelines and recommendations may be found on www.iacs.org.uk. 2.2.31 IACS member society: A classification society being a member of IACS. 2.2.32 IMO: The International Maritime Organization. 2.2.33 Independent tank: Self-supporting tank which does not form part of the vessel's hull and does not contribute to the hull strength. Independent gravity tank is a tank with design vapour pressure not exceeding 0.7 bar. Pressure vessel is a tank with design gas or vapour pressure exceeding 0.7 bar. 2.2.34 Interpretation: Norms for fulfilling the associated principle requirements as defined by other regulatory bodies on matters which are left to the satisfaction of the flag administration or are vaguely worded. These do not preclude the use of other alternative solutions but these shall be documented and approved for compliance to the principal requirement equivalent to the original interpretation. 2.2.35 ISO: Signifies the International Organisation for Standardization. 2.2.36 HP: High Pressure. 2.2.37 Lay-up: A terminology used for vessels that are out of commission. In this state the offshore vessel may be at anchorage or permanently moored in a safe harbour. 2.2.38 LRFD methodology: Load and resistance factor design methodology. 2.2.39 Main hoisting system: All major lifting equipment directly involved in lifting pipe, riser etc. into and out of the well, such as drawworks, hydraulic cylinders, top drive, links, elevators etc. Pipe handling equipment used for making up and breaking out pipe/stands are not considered main hoisting systems. 2.2.40 Manufacturer: Signifies the entity that manufactures the material or product, or carries out part production that determines the quality of the material or product, or does the final assembly of the product. 2.2.41 Mechanical Completion (MC): Verification that the components, equipment and the systems are constructed, installed and tested in accordance with applicable drawings and specifications and are ready for testing and commissioning in a safe manner. 2.2.42 Memorandum to Owner (MO): Constitutes information related to the ship, its machinery and equipment or to rule requirements. A MO will be issued in relation to information that does not require any corrective action or survey. 2.2.43 Mobile offshore unit: A buoyant construction engaged in offshore operations including drilling, production, storage or support functions, not intended for service at one particular offshore location, and which can be relocated without major dismantling or modification. 2.2.44 OEM: Original Equipment Manufacturer. 2.2.45 Offshore installation: A collective term to cover any construction, buoyant or non-buoyant, designed and built for installation at a particular offshore location. 2.2.46 Overall examination: An examination intended to report on the overall condition of the structure. 2.2.47 Owner: Signifies the registered owner or manager of the vessel or any other organization or person who
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has assumed the responsibility for operation of the vessel and who on assuming such responsibility has agreed to take over all the duties and responsibilities. 2.2.48 Plan approval: Signifies a systematic and independent examination of drawings, design documents or records in order to verify compliance with the rules or statutory requirements. Plan approval will be carried out at the discretion of the Society, which also decides the extent and method of examination. 2.2.49 Plan approval staff: Personnel authorized to carry out plan approval and to conclude whether or not compliance has been met. 2.2.50 Position mooring: Anchoring system for position keeping at the unit's working location. 2.2.51 Prompt and thorough repair: A permanent repair completed at the time of survey to the satisfaction of the surveyor, therein removing the need for the imposition of any associated condition of class. 2.2.52 Quality audit: A systematic and independent examination to determine whether established work processes and quality systems are adhered to. 2.2.53 Quality system: Signifies both the quality management system and established production and control procedures. 2.2.54 Quality Survey Plan (QSP): A plan that systematically identifies activities related to the classification project (e.g., Construction, installation, testing, mechanical completion, pre-commissioning, testing and commissioning) and the extent of involvement each party (i.e., Yard's QC, Yards' QA, DNV and Owners [if desired]) will undertake. Such a plan needs to be submitted to the Society for approval prior to commencement of classification projects. 2.2.55 RBI: Risk Based Inspection. 2.2.56 RCM: Reliability Centred Maintenance. 2.2.57 Recognised classification society: A classification society which is a full or associate member of IACS. 2.2.58 Reliability: The ability of a component or a system to perform its required function under given conditions for a given time interval. 2.2.59 Representative tanks: Those tanks which are expected to reflect the condition of other tanks of similar type and service and with similar corrosion protection systems. When selecting representative tanks account shall be taken of the service and repair history on board and identifiable critical and/or suspect areas. 2.2.60 Retroactive Requirement (RR): Constitutes a class or statutory requirement that will enter into force for certain vessel’s in operation and under construction at a given date or an upcoming survey. The RR will specify the required actions to be taken in order to retain class or statutory certification. RR related to statutory certification will be issued only if the Society has been authorised to carry out statutory certification on behalf of the flag administration. 2.2.61 Review: Signifies a systematic examination of drawings, design documents or records in order to evaluate their ability to meet requirements, to identify any problems and to pro-pose necessary actions. 2.2.62 The Rules: All rule requirements accepted by the appropriate approval body as basis for classification. 2.2.63 Sighting survey: A survey to confirm that the relevant construction or the equipment is in a satisfactory condition and, as far as can be judged, will remain so until the postponed survey has been carried out. 2.2.64 Significant repair: A repair where machinery is completely dismantled and re-assembled. Significant repairs will, furthermore, be cases of repairs after serious damage to machinery. 2.2.65 The Society: Signifies DNV GL AS. 2.2.66 Safety systems: Systems, including required utilities, which are provided to prevent, detect/ warn of an accidental event/abnormal conditions and/or mitigate its effects. Interpretation: 1) The following should be considered as safety systems: — — — — ESD, including blowdown where relevant PSD Fire and gas detection PA/GA
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— Fire-fighting systems — BOP incl. control system — Safety systems for essential or important services. 2) Safety systems are normally considered as “on-demand” functions. ––––––––––––––– end of Interpretation ––––––––––––––– 2.2.67 Spaces: Separate compartments including holds and tanks. 2.2.68 Statement of compliance: A document confirming compliance with specified requirements. Such documents may be issued by the Society in cases where it has not been authorised to certify compliance. 2.2.69 Statutory certificates: IMO convention certificates issued on behalf of, or by, national authorities. 2.2.70 Statutory survey: Survey carried out by or on behalf of a flag administration. 2.2.71 Substantial corrosion: Extent of corrosion such that assessment of corrosion pattern indicates wastage in excess of 75% of allowable margins, but within acceptable limits. 2.2.72 Survey: Signifies a systematic and independent examination of a vessel, materials, components or systems in order to verify compliance with the rules and/or statutory requirements. Surveys will be carried out on the vessel, at the construction or repair site as well as at sub-suppliers and other locations at the discretion of the Society, which also decides the extent and method of control. 2.2.73 Survey staff: Personnel authorized to carry out surveys and to conclude whether or not compliance has been met. 2.2.74 Suspect areas: Areas showing substantial corrosion and/or are considered by the surveyor to be prone to rapid wastage. 2.2.75 SWL: Safe Working Load. 2.2.76 Temporary conditions: Design conditions not covered by operating conditions, e.g. conditions during fabrication, mating and installation phases, dry transit phases. 2.2.77 Temporary equipment: Equipment intended for use on board for a period not exceeding 30 months and which is covered by class, requires hook-up to systems covered by class and/or is a significant deck load and/ or may pose a risk for fire, explosion and escape routes. 2.2.78 Temporary mooring: Anchoring in sheltered waters or harbours exposed to moderate environmental loads. 2.2.79 Tentative rules and standards: Apply to new fields to which DNV reserves the right to make adjustments during a period in order to obtain the purpose intended. 2.2.80 (normal) Towing: Drawing or pulling the unit by a chain or line using a tug boat. Normally towing is performed for units without any propulsion for (re-)location (compare with emergency towing as defined in [2.2.25]). 2.2.81 Transit conditions: All wet vessel movements from one geographical location to another. 2.2.82 Transverse section: Section which includes all longitudinal members such as plating, longitudinals and girders at the deck, side, bottom, inner bottom and hopper side plating, longitudinal bulkhead and bottom plating in top wing tanks, as applicable. For transversely framed vessels, a transverse section includes adjacent frames and their end connections in way of transverse sections.
Guidance note: Adjacent frames include the frames located just forward and aft of the transverse section.
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2.2.83 UT: Ultrasonic Testing. 2.2.84 Verification: A service that signifies a confirmation through the provision of objective evidence (analysis, observation, measurement, test, records or other evidence) that specified requirements have been met. 2.2.85 Vertical contract audit: An IACS audit which assesses the correct application of the quality system through audit of the process for a specific contract. The IACS QSCS (Quality System Certification Scheme) audit team is responsible for carrying out these audits.
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2.2.86 Vessel: In the context of these rules mean a mobile offshore unit (MOU). 2.2.87 Witnessing: Signifies attending tests or measurements where the surveyor verify compliance with agreed test or measurement procedures. 2.2.88 WSD methodology: Working stress design methodology.

3 Normative references
3.1 Normative references
DNV-OSS-101 includes references to other DNV documents and recognised codes and standards which shall be used in conjunction with the requirements given in this document for assignment of class.

3.2 DNV reference documents
Applicable DNV reference documents are listed in Table 1-1. See Sec.2 [1.2] for applicable editions. Table 1-1 DNV reference documents
Reference DNV-OS-A101 DNV-OS-B101 DNV-OS-C101 DNV-OS-C102 DNV-OS-C103 DNV-OS-C104 DNV-OS-C201 DNV-OS-C301 DNV-OS-C401 DNV-OS-D101 DNV-OS-D201 DNV-OS-D202 DNV-OS-D301 DNV-OS-E101 DNV-OS-E201 DNV-OS-E301 DNV-OS-E401 DNV-OS-J301 DNV-RP-A201 DNV-RP-C101 DNV Standards for Certification No. 2.22 DNV Rules for Classification of Ships Title Safety Principles and Arrangement Metallic Materials Design of Offshore Steel Structures, General (LRFD Method) Structural Design of Offshore Ships Structural Design of column-stabilised Units (LRFD method) Structural Design of Self-Elevating Units (LRFD method) Structural Design of Offshore Units (WSD method) Stability and Watertight Integrity Fabrication and Testing of Offshore Structures Marine and Machinery Systems and Equipment Electrical Installations Automation, Safety, and Telecommunication Systems Fire Protection Drilling Plant Oil and Gas Processing Systems Position Mooring Helicopter Decks Wind Turbine Installation Units Plan Approval Documentation Types – Definitions Allowable Thickness Diminution for Hull Structure Lifting Appliances DNV Rules for Classification of Ships (Rules for Ships)

3.3 Other references
Other normative references are given in Table 1-2. See Sec.2 [1.2] for applicable editions. Table 1-2 Non-DNV normative references
Reference IACS Title Shipbuilding and Repair Quality Standard, see www.iacs.org.uk

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4 Informative references
4.1 DNV informative references
The publications listed in Table 1-3 are referenced in the text of this document, and may be used as a source of supplementary services and information. See Sec.2 [1.2] for applicable editions. Table 1-3 DNV informative references
Reference DNV-OSS-102 DNV-OSS-103 Title Rules for Classification of Floating Production, Storage and Loading Units Rules for Classification of LNG/ LPG Floating Production, Storage and Loading Units DNV-OSS-104 Rules for Classification of Self-Elevating Units DNV-OSS-201 Verification for Compliance with Norwegian Shelf Regulations DNV-OSS-202 Verification for Compliance with UK Shelf Regulations DNVGL-SE-0003 Verification for Compliance with US Coastal Shelf Regulations Standard for Certification No. 1.2 Type Approval

4.2 Other references
Other references are given in Table 1-4. See Sec.2 [1.2] for applicable editions. Table 1-4 Other references
Reference API RP 2I API RP 8B BS 5430-1 ISO 3166 ISO 4309 ISO 9001 ISO 17359 PD 5500 (Previous BS 5500) Title In-service inspection of mooring hardware for floating drilling units Inspection, maintenance, repair, and re-manufacture of hoisting equipment Periodic inspection, testing and maintenance of transportable gas containers (excluding dissolved acetylene containers). Specification for seamless steel containers of water capacity 0.5 litres and above Codes for the representation of names of countries and their subdivisions Cranes - Wire ropes - Care, maintenance, installation, examination and discard Quality management systems - Requirements Condition monitoring and diagnostics of machines - General guidelines Specification for unfired fusion welded pressure vessels

5 Abbreviations
The abbreviations given in Table 1-5 are used in this standard. Table 1-5 Abbreviations
Abbreviation API BS DFF DNV DP EDP IC IIP ISO LRFD MPI NDT OS OSS RCM RP SCF SHIP WSD In full American Petroleum Institute British Standard (issued by British Standard Institution) Design Fatigue Factors Det Norske Veritas Dynamic Positioning Emergency Disconnect Package Inspection Category In service Inspection Program International Organisation for Standardisation Load and Resistance Factor Design Magnetic Particle Inspection Non-Destructive Testing Offshore Standard Offshore Service Specification Reliability Cantered Maintenance Recommended Practice Stress Concentration Factor DNV Rules for Classification of Ships Working Stress Design DET NORSKE VERITAS AS

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SECTION 2 CLASSIFICATION PRINCIPLES
1 The classification concept
1.1 Introduction
1.1.1 Classification provides assurance that a set of requirements laid down in rules established by DNV are met during design and construction, and maintained during operation of a vessel. Classification has gained worldwide recognition as representing an adequate level of safety and quality. 1.1.2 Classification implies an activity, in which a vessel is surveyed during construction on the basis of design approval, tested before being taken into service, and surveyed regularly during its whole operational life. The aim is to verify that the required safety standard is built in, observed and maintained. 1.1.3 Having assigned class, DNV will issue a classification certificate and enter the main particulars and details of class in the “Register of vessels classed with DNV”.

1.2 Applicable rules
1.2.1 Rules and amendments accepted by the appropriate approval body will come into force when decided by the appropriate approval body. Unless stated otherwise, the coming into force date shall be six (6) months after the date of publication. Unless stated otherwise, the coming into force date for documents referenced by this OSS as technical basis for classification shall be six (6) months after the date of publication. 1.2.2 The applicable rules for assignment of class to a new vessel are those in force at the date (as given to the Society by the customer) when the contract between the owner and the builder is signed. Subsequent amendments not made mandatory according to [1.2.4] may be applied to objects under construction provided both builder and owner agree to such application. 1.2.3 In exceptional cases, where unacceptable service experience and/or theoretical findings clearly show that safety hazards may arise in connection with items covered by the existing rules, DNV may lay down supplementary requirements to maintain the overall safety standard reflected by the rules. 1.2.4 DNV will consider alternatives found to represent an overall safety standard equivalent to that of the rules. The alternative solution shall be adequately documented and will be reviewed for acceptance on the basis of relevant references set forth by DNV. Approval may be revoked if subsequent information indicates that the chosen alternative is not satisfactory. In cases where detailed requirements are not given in the rules, specific solutions or decisions approved by DNV and its surveyors shall be based on the principles of the rules, and shall give a safety standard equivalent to that of the rules. 1.2.5 The approval as required in [1.2.4] shall be based on an agreed scheme of analysis that is separately worked out and approved.
Guidance note: For new technology, Recommended Practice DNV-RP-A203 can be a suitable basis for such scheme.
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1.2.6 Upon request by the customer, DNV may consider the use of other recognised codes and standards as part of the basis for classification. Such agreed alternative arrangements shall be specified in the class agreement. 1.2.7 The Society may propose an approach to resolve the issue if detailed requirements are not given in the rules. 1.2.8 Exceptionally, if for some reason, it is impossible to comply with a rule requirement or to find a fully equivalent solution, then other solutions may be accepted by DNV provided the parties to the classification contract all agree, and always provided that overall safety level is not jeopardised. The alternative solution shall be adequately documented and will be reviewed for acceptance on the basis of relevant references set forth by DNV. The solution shall be recorded in the “Appendix to the Classification Certificate”. 1.2.9 In accordance with [1.2.4], DNV may consider the use of reliability methods as a means of documenting compliance to class requirements. 1.2.10 The Society reserves the exclusive right to interpret, decide equivalence or make exemptions to the rules.
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1.2.11 The rules are an integral part of the Society's classification service. The safety objectives inherent in the rules are achieved in conjunction with this service. Using the rules without the corresponding classification services may have the result that safety objectives are not met. 1.2.12 Periodical survey regulations for retaining class shall be according to the rules in force at the time of survey (given in Ch.3).

1.3 Basis for assignment of class
1.3.1 Having assigned a specific class implies that DNV: — has been satisfied that the object meets the rule requirements for the particular class — will verify, through a system of surveys, that the requirements stipulated for retention of class are complied with. 1.3.2 Prior to assigning class to an existing offshore object, it is in general to undergo all periodical surveys pertaining to the age and type of object. 1.3.3 When assigning class to a vessel which has not been built under supervision of DNV, but by another recognised classification society, DNV may on the basis of an overall safety consideration in connection with a design review and survey, give exemptions from rule requirements. 1.3.4 When assigning class to vessels of a series under construction to the classification of, or a design previously accepted by, a recognised classification society, DNV may on the basis of an overall safety consideration in connection with a design review give exemptions from DNV rule requirements, and base the survey on the design approval done by the other recognised society. A note to this effect may be included in the Appendix to the classification certificate. 1.3.5 When assigning class to a vessel registered in a flag state that undertakes approval and surveys of items covered by the rules, DNV may accept their decisions as basis of assigning class. 1.3.6 DNV may also accept decisions by the national authority with jurisdiction over the waters in which the vessel or installation is to operate (shelf state) as basis for assigning class. 1.3.7 When other recognised codes or standards is used as basis for assignment of class, an overall comparison with DNV rules shall be carried out to ensure that all aspects of safety are covered by a defined code or standard.

1.4 Basis for maintenance of class
1.4.1 The requirements for retention of class are found in Sec.4 [2]. In addition, classification is based on the following: Valid statutory certificates For flagged vessels and installations the statutory certificates of the applicable international conventions shall be valid at all times, and the surveys prescribed in the conventions shall be carried out within the time windows prescribed. Maintenance of the vessel or installation and its equipment It is assumed that the vessel, machinery installations and equipment are maintained at a standard complying with the requirements of the rules. Installed systems or equipment carried on board in excess of the rule requirements, but otherwise covered by the rules, shall either be maintained in accordance with the rules, or be removed or disconnected in such a way as to ensure that the installed system or equipment cannot be used. Handling of the vessel or installation It is assumed that the vessel, machinery installations and equipment are adequately manned and competently handled. Class conditions regarding the use of the vessel shall be observed. Recording of lightweight and centre of gravity The data for lightweight and centre of gravity (C.o.G.) shall be continuously recorded and adjusted by the master for any items taken onboard or ashore during operation.
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1.5 Documentation
1.5.1 All information that may influence the judgement, decisions and requirements of DNV for the purpose of classification, shall be made available to DNV. It is the customer's responsibility to document or demonstrate compliance with the Society's rules. Information may be made available by submitting documents to the Society or by permitting surveys performed by the Society at the customer's premises, onboard the vessel or at the premises of the customer's sub-contractors. 1.5.2 The documentation forming the basis for classification is, at all times, to reflect the true conditions. Revisions of documents are therefore to be submitted to DNV to the extent such revisions may influence decisions and requirements relating to class. 1.5.3 The submitted documentation shall use SI-units (International System of Units) unless otherwise agreed.

1.6 Disclosure of information
1.6.1 DNV will not disclose any information received or reports made in connection with classification to any other than those entitled thereto or those having been given the right to receive information by legislation, court decision or by written permission by the owner.
Guidance note: Table 2-1 indicates which parties will be entitled to various kinds of information.
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1.6.2 DNV will not disclose information that can be considered as the property of another party except when this party's permission is given in writing. 1.6.3 Internal communication, notes, calculations etc. produced within DNV in connection with classification will not be disclosed to other parties. 1.6.4 Notwithstanding [1.6.1] to [1.6.3], the following parties will have access to such information: — authorised representatives of the flag administration — authorised audit teams performing audits in connection with certification of the Society. 1.6.5 Notwithstanding [1.6.1] to [1.6.3], the Society may disclose information requested by a court order, governmental body (including regional bodies) or other public investigation bodies that are authorised by a decree. 1.6.6 Information recorded in the Society's “Register of Vessels”, will be published and/or released to any interested party. 1.6.7 The Society may at its discretion release to other classification societies information concerning relevant technical information on serious hull structural, ship machinery and system failures for the purpose of improving ship safety and protection of the marine environment. The owners will be informed accordingly.

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Table 2-1 Disclosure of information
Information in question Owner Flag administration Port state authority/ Coastal state authority Insurance company*) Builder or supplier

Newbuildings: Approved structure Yes 1) Upon request No No Yes 1) related drawings Approved system and Yes 1) Yes 1) No No Yes 1) component drawings Vessels in operation: Class and statutory certificates issued by Yes Yes Upon request 3) Yes 2) N/A the Society Condition on behalf of the flag Administration Yes Yes Yes Yes 2) N/A (CA) Text of Conditions of Yes Yes Yes Yes4) N/A Class (CC) Text of Condition on behalf of the flag Yes Yes Yes Yes4) N/A Administration (CA) Survey reports Yes Yes Yes 1) Yes 2) N/A Memorandum to Yes Yes Yes 1) Yes 2) N/A Owner (MO) Retroactive Yes Yes Yes 1) Yes 2) N/A Requirement (RR) Other information: Correspondence with Yes 1) Yes 1) No Yes 1) Yes 1) Builder or owner 1) When accepted in writing by owner, builder or copyright holder, as applicable 2) When accepted in writing by owner or through special clause in insurance contract 3) Survey reports pertaining to a Port State Control (PSC) rectification survey can be given upon request from the PSC authority 4) Overdue Conditions of Class only *) Insurance company means P&I Clubs and Hull & Machinery Underwriters N/A Not applicable. However, certificates with possible related CC and MO will normally be received by the builder upon class assignment.

1.7 Access
1.7.1 For the purpose of verifying compliance with the rules, the customer shall whenever necessary provide the Society's surveyors with safe access to the vessel and/or to their premises. The premises and objects to be inspected shall as agreed be cleaned and prepared for inspection. 1.7.2 The customer shall provide flag authorities and authorised audit teams with safe access to the vessel and/ or to their premises in order to audit the Society's compliance with applicable rules, regulations and quality standards. 1.7.3 The Society reserves the right to decline to perform a requested service when inadequate access is provided or the safety of its surveyors may be compromised.

1.8 Calibration of equipment
Measuring and test equipment used by customers, the result of which may form the basis for the surveyor's decisions, shall have a calibration status to an appropriate accuracy according to the rules or as accepted by the surveyor.

1.9 Service suppliers
Suppliers providing services on behalf of the customer, such as measurements, tests and maintenance of safety systems and equipment, the result of which may form the basis for the surveyor's decisions, shall be approved by the Society, according to criteria established by the Society.

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Offshore Service Specification DNV-OSS-101, October 2014 Ch.1 Sec.2 Classification principles – Page 24

1.10 Limitation of DNV's responsibility
The classification service is performed on the basic assumption that other parties involved (building yard, designers, manufacturers, sub-contractors, owners, etc.) fulfil their individual obligations. The classification service is not performed in substitution of other parties' role or obligations. DNV Surveyors will not substitute the essential role of Yard or Subcontractors Quality Control / Quality Assurance inspectors/officers or other relevant personnel. Nothing contained herein or in any certificate, report or document issued in connection with or pursuant to these rules, shall relieve any designer, engineer, builder, manufacturer, yard, seller, supplier, owner, operator or other parties from any obligations or consequences of default whatsoever. In particular, compliance with the rules does not imply acceptance or commissioning of a vessel. This is the exclusive responsibility of the owner. Any document issued by DNV in relation to surveys performed reflects the condition of the vessel at the time of survey. It is the responsibility of the owner to maintain the condition of the vessel as required by the rules between surveys.

2 Appeals
2.1 Decisions taken by the society
The customer may request in writing that a decision made by the Society shall be taken up for reconsideration. The expenses incurred shall be paid by the customer. However, if the earlier decision is revoked, the Society’s expenses will be covered by the Society.

3 Statutory certification
3.1 General
3.1.1 The Society undertakes statutory certification on behalf of flag administrations when and to the extent the Society has been authorised to do so by the individual flag administration. Statutory certification includes inter alia approval, survey and the issuance of statutory certificates. When the Society acts on behalf of a flag administration, the Society follows international statutory instruments, IACS Unified Interpretations and DNV Statutory Interpretations, and generally follows guidance issued by IMO in Circulars etc. unless the flag administration has instructed the Society otherwise. 3.1.2 It is assumed by the Society that required statutory surveys for vessels classed by the Society will be carried out by the Society or by officers of the flag administration itself and that statutory certificates will be issued by the Society or by the flag administration with the exceptions mentioned in [3.1.3] to [3.1.6]. The Society assumes the right to withdraw class if statutory certificates are not issued as described in this paragraph. 3.1.3 The Society may accept that Safety Management Certificates (ISM Code) are issued by a third party that has been authorised by the flag administration and complies with IMO Resolution A.739(18) and A.789(19). 3.1.4 The Society may accept that International Ship Security Certificates (ISPS Code) are issued by a third party that has been authorised by the flag administration and complies with MSC/Circ.1074. 3.1.5 The Society may accept that Cargo Ship Safety Radio Certificates (SOLAS) are issued by a third party that has been authorised by the flag administration. 3.1.6 For a dually classed vessel, where the Society has not been authorised by the flag administration to issue statutory certificates, the Society may accept that such certificates are issued by the dual class society provided the other class society is authorised by the flag administration.

3.2 Service suppliers
Where surveyors use the services of service suppliers in making decisions affecting statutory requirements, the suppliers shall be approved by either: — — — — the relevant flag administration duly authorised organisations acting on behalf of the flag administration an equipment supplier when explicitly described by IMO conventions, resolutions or circulars, or the Society.
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Offshore Service Specification DNV-OSS-101, October 2014 Ch.1 Sec.3 Classification scope and notations – Page 25

SECTION 3 CLASSIFICATION SCOPE AND NOTATIONS
1 Scope of classification
1.1 General
The rules and referred standards define acceptance criteria for design, construction, survey and testing of vessels, their marine and machinery installations, systems and equipment, applicable to the newbuilding and operational phase.

1.2 Rule parts
1.2.1 The present offshore service specification states terms and procedures for assigning and maintaining class for offshore drilling and support units, as well as listing the applicable technical reference documents stipulating technical requirements for classification. These may be DNV offshore standards, other DNV standards and internationally recognised codes. 1.2.2 Ad hoc combination of codes or standards, different as described in the rules, should only be made after proper consideration of the compatibility of the documents, and only where safety and sound engineering practice can be justified. Such selective (piecemeal) application of a code or standard shall be verified.

1.3 Rule particulars
The rules with reference standards give requirements in the following areas:
Hull and main structure — strength — materials and welding — corrosion protection — constructional fire protection — weathertight and watertight integrity — stability and floatability — tank arrangement. Marine and machinery installations and equipment Machinery installations and equipment, including their related auxiliary functions, with respect to strength and performance as applicable to the following main functions: — power generation — position keeping — propulsion (as applicable) — steering (if applicable) — fire and flammable gas detection, fire protection and extinguishing — drainage and bilge pumping — ballasting — emergency shutdown systems (as applicable). Other machinery installations, regardless of their contribution to the main functions stated above, when located in enclosed hull compartments below the damage water line. Other installations stated in the rules.

2 Class notations
2.1 General
Classed units will be given a class designation consisting of: — — — — — — construction symbol main character of class basic design notation service notation special equipment and systems notations (as applicable) special feature notations (as applicable).

2.2 Construction symbols
2.2.1 The symbol X will be given to units built under the supervision of DNV. 2.2.2 The symbol X will be given to units built under the supervision of a recognised classification society and later assigned class with DNV.
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2.3 Main character of class
The notation 1A1 will be given to units with hull and marine machinery and equipment found to be in compliance with the basic (common) requirements of the applicable DNV offshore standards referred to in the rules.

2.4 Basic design notations
The basic design notation indicates the type of structural design. The notations currently in use are given in Table 3-1. Table 3-1 Class notations related to basic design
Class notation Description Design Survey requirements requirements Ch.2 Sec.1 Ch.2 Sec.1 Ch.2 Sec.1 Ch.2 Sec.1 Ch.3 Ch.3 Ch.3 Ch.3 A structure dependent on the buoyancy of widely spaced columns Column-stabilised for floatation and stability in all modes of operation A structure with hull of sufficient buoyancy for safe transport Self-elevating which is raised above sea surface on legs supported by the sea bed during operation Monohull ship and barge structures having displacement hulls Ship-shaped with or without propulsion machinery Mobile Offshore A structure not properly characterised by the above notations

2.5 Service notations
2.5.1 Units constructed according to DNV rules for offshore classification, arranged for a particular service and found to be in accordance with the relevant requirements for such service, will be given a corresponding service notation. 2.5.2 Service notations currently in use are defined in Table 3-2. Table 3-2 Class notations related to service
Class notation Accommodation Crane Drilling Offshore Support Well Intervention Wind Turbine Installation Description Design requirements Ch.2 Sec.4 Ch.2 Sec.5 Ch.2 Sec.2 N/A Survey requirements Ch.3 Sec.5 [4] Ch.3 Sec.5 [5] Ch.3 Sec.5 [2] Ch.3 Sec.5 [7] Ch.3 Sec.5 [3] Ch.3 Sec.5 [6]

Vessel purpose accommodation Vessel purpose crane operation Vessel purpose drilling Vessel purpose offshore support Vessel purpose well intervention, defined with Ch.2 Sec.3 qualifier 1 or 2 Vessel purpose installation of fixed and floating wind Ch.2 Sec.6 power equipment

2.5.3 The service notations in Table 3-2 shall be considered mandatory for the relevant types of units except for Well Intervention 1 (see Ch.2 Sec.3 for further details). 2.5.4 Classification services related to hydrocarbon production, storage and loading are presented in DNVOSS-102. 2.5.5 Units intended for both drilling and production service (FDPSO) shall comply with the requirements for production units in DNV-OSS-102 and for drilling units in this document (in case of conflicting requirements, the most stringent requirement will prevail).

2.6 Optional class notations related to special equipment and systems
Units having special equipment or systems found to satisfy specified class requirements will be given a corresponding additional class notation. Notations currently in use are given in Table 3-3.

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Table 3-3 Class notations related to equipment and systems
Class notation BWM CLEAN/ CLEAN DESIGN COMF CRANE DPS DRILL DSV DYNPOS E0 ECO ES ESV F FMS HELDK HMON ISDS LCS OPP-F POSMOOR Recyclable TEMPSTORE VCS VIBR WELL WELLTEST Description Ballast Water Management Arrangements for controlling and limiting operational emissions and discharges Comfort class Onboard crane Dynamic positioning system Drilling plant Diving System Installations Dynamic positioning system Periodically unattended machinery space Machinery centralised operated Enhanced Systems Enhanced System Verification Additional fire protection Fatigue methodology for ship-shaped units Helicopter deck Hull Monitoring System Integrated Software Dependent System Loading computer system Oil pollution prevention - fuel systems Position mooring system Inventory of Hazardous Materials Part 1 Temporary storage of oil Vapour Control Systems Vibration level criteria for machinery, components, equipment and structure Well intervention system Well test system Design requirements Ch.2 Sec.7 [19] Ch.2 Sec.7 [19] Ch.2 Sec.7 [17] Ch.2 Sec.7 [9] Ch.2 Sec.7 [4] Ch.2 Sec.7 [5] Ch.2 Sec.7 [10] Ch.2 Sec.7 [4] Ch.2 Sec.7 [13] Ch.2 Sec.7 [13] Ch.2 Sec.7 [2] Ch.2 Sec.7 [20] Ch.2 Sec.7 [11] Ch.2 Sec.7 [16] Ch.2 Sec.7 [6] Ch.2 Sec.7 [15] Ch.2 Sec.7 [21] Ch.2 Sec.7 [12] Ch.2 Sec.7 [19] Ch.2 Sec.7 [3] Ch.2 Sec.7 [19] Ch.2 Sec.7 [8] Ch.2 Sec.7 [19] Ch.2 Sec.7 [17] Ch.2 Sec.7 [14] Ch.2 Sec.7 [7] Survey requirements Ch.3 Sec.6 [18] Ch.3 Sec.6 [18] N/A Ch.3 Sec.6 [8] Ch.3 Sec.6 [3] Ch.3 Sec.6 [4] Ch.3 Sec.6 [9] Ch.3 Sec.6 [3] Ch.3 Sec.6 [12] Ch.3 Sec.6 [12] N/A N/A Ch.3 Sec.6 [10] Ch.3 Sec.6 [15] Ch.3 Sec.6 [5] Ch.3 Sec.6 [14] Ch.3 Sec.6 Ch.3 Sec.6 [11] Ch.3 Sec.6 [18] Ch.3 Sec.6 [2] Ch.3 Sec.6 [18] Ch.3 Sec.6 [7] Ch.3 Sec.6 [18] Ch.3 Sec.6 [16] Ch.3 Sec.6 [13] Ch.3 Sec.6 [6]

2.7 Optional class notations related to cold climate operation
2.7.1 Units designed or strengthened for operation within particular geographical or environmental areas found to be in accordance with relevant class rule requirements may be assigned a corresponding optional class notation. 2.7.2 Optional class notations related to cold climate service are given in Table 3-4. 2.7.3 Further details on notation qualifiers and application for different vessel types is given in Ch.2 Sec.7 [18]. Table 3-4 Class notations related to cold climate
Class notation DAT ICE PC WINTERIZED Description Design ambient air temperature for material selection suitable for regular service during winter to Arctic or Antarctic waters Structural strength for navigation in ice Polar Class –structural strength for navigation in iceinfested polar waters Systems designed for operation in cold climate Design requirements Survey requirements

Ch.2 Sec.7 [18] NA Ch.2 Sec.7 [18] N/A Ch.2 Sec.7 [18] NA Ch.2 Sec.7 [18] Ch.3 Sec.6 [17]

2.8 Special feature notations
2.8.1 Special feature notations provide information regarding special design assumptions, arrangements or equipment which is not covered by other class notations.

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2.8.2 Special feature notations currently in use are listed in Table 3-5. Table 3-5 Class notations related to special features
Class notation BIS INERT NON SELFPROPELLED SELF-PROPELLED TMON Description Built for in-water survey Inert gas system Design requirements Ch.2 Sec.7 [22] Rules for Ships Pt.5 Ch.3 Sec.11 Survey requirements NA NA Ch.3 Sec.6 [20] Ch.3 Sec.6 [20] Ch.3 Sec.6 [20]

Towing assistance will be required during transit Ch.2 Sec.7 [22] Units with propulsion (applicable for selfelevating units only) Tailshaft monitoring Ch.2 Sec.7 [22] Ch.2 Sec.7 [22]

2.8.3 Self-elevating units are considered to be non self-propelled unless specified with the special feature notation SELF-PROPELLED.

2.9 Service restrictions
2.9.1 Units not approved for unrestricted service will have relevant service restrictions stated in the “Appendix to the classification certificate”. These units will be given the class notation R to indicate that restrictions apply. The notation R will be inserted after the main character of class. 2.9.2 Other service restrictions or operational limits included in the design assumptions of a unit will be stated in the “Appendix to the classification certificate”, and/or on special signboards onboard. 2.9.3 Service restrictions and deviations from the rule requirements shall be addressed in a memo for owners (MO) informing them about the assumption for the class notation if the unit shall be operated outside the geographical areas or other boundaries agreed in the classification contract.

2.10 Compliance with coastal state legislation
2.10.1 When DNV is requested to carry out verification in accordance with coastal state regulations for the complete unit or parts of the unit, an additional notation may be assigned to the relevant class designations, consisting of the relevant coastal state code and the issue of coastal state regulations used as basis for verification in brackets, e.g.: DRILL(N). 2.10.2 Coastal state code notations currently in use, are listed in Table 3-6. Table 3-6 Notations for coastal state verification
Notation Accommodation Unit(N) Drilling Unit(N) Well Intervention Unit(N) DRILL(N) HELDK-SH(N)/ HELDK-SHF(N) DRILL(US) UKVS Description

Verified for compliance with DNV’s interpretation of relevant Norwegian coastal state requirements.

Verified for compliance with DNV's interpretation of relevant US Outer Continental Shelf Verified for compliance with DNV’s interpretation of relevant UK coastal state requirements.

2.10.3 For further information on procedures and scope of verification for coastal state requirements, see DNV Offshore Service Specifications for coastal state compliance services listed in Table 1-3.

2.11 Combination of notations
2.11.1 Class notations shall be combined as follows: X 1A1 <service restriction, if any><basic design notation> <service notation> <special equipment and systems notations><special feature notations> Example: X 1A1 Column-stabilised Drilling Unit POSMOOR NONSELF-PROPELLED. 2.11.2 Ship-shaped units may also be assigned relevant class notations given in the DNV Rules for Classification of Ships (Rules for Ships).
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Offshore Service Specification DNV-OSS-101, October 2014 Ch.1 Sec.4 Assignment of class – Page 29

SECTION 4 ASSIGNMENT OF CLASS
1 Assignment of class - new vessels
1.1 General
A request for classification of a new vessel shall be submitted in writing by the customer. The Society reserves the right to decline a request for classification.

1.2 Requirements for builder or designer
1.2.1 Builders or designers unfamiliar to the Society shall provide the Society with evidence of their capability to successfully manage classification projects.
Guidance note: Evidence may incorporate successful outcome of classification projects carried out for another IACS member society or successful outcome of design projects of similar nature.
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1.2.2 Builders or designers shall instruct their subcontractors and suppliers of materials, components and systems that the Society's rules apply and that the Society's certificates shall be provided as and when required by the rules. 1.2.3 Welding of important structures, machinery installations and equipment shall be carried out by approved welders, with approved welding consumables and at welding shops approved by the Society. Requirements for approval of welding shops, welders, manufacturers of welding consumables, welding consumables and welding procedures are given in DNV-OS-C401 and by a series of detailed approval programmes. 1.2.4 The following documentation from the builder or designer (workshop and yard) and from subcontractors shall be submitted when requested by the Society: — information related to the builder’s or designer’s quality control and quality management system — information related to the builder's procedures for managing materials that are excluded from use on board by class and/ or statutory requirements — list of relevant subcontractors to the building yard — list of relevant subcontractors to the manufacturer of systems and components to be delivered for the product, if applicable. 1.2.5 To assess compliance with the rules the Society may require additional documentation and carry out an assessment of yard's processes, systems and personnel related to classification projects. The results of the assessment should be used as a basis to decide on the extent of the involvement of surveyors of the Society. The extent of verification should be clearly reflected in the Quality Survey Plan (QSP).
Guidance note: A generic version of Quality Survey Plan (QSP) issued by the Society can be used as a model to develop an appropriate Quality Survey Plan for specific classification projects that should be submitted to the Society for approval before commencing activities in the project.
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1.2.6 Calculations specified in the requirements shall be carried out by computer programs supplied by, or recognised by the Society. Programs applied where reliable results have been demonstrated to the satisfaction of the Society are regarded as recognised programs. Generally valid approvals for computer programs are, however, not given by the Society.

1.3 Applicable rules
1.3.1 The rules that apply for assignment of class to a new vessel are generally those in force at the date of “contract for construction”. The term date of “contract for construction” shall be construed as follows: 1) The date of “contract for construction” of a vessel is the date on which the contract to build the vessel is signed between the prospective owner and the shipbuilder. This date and the construction numbers (i.e. hull numbers) of all the vessels included in the contract are to be declared to the classification society by the party applying for the assignment of class to a newbuilding. 2) The date of “contract for construction” of a series of vessels, including specified optional vessels for which the option is ultimately exercised, is the date on which the contract to build the series is signed between the prospective owner and the shipbuilder.
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Vessels built under a single contract for construction are considered a “series of vessels” if they are built to the same approved plans for classification purposes. However, vessels within a series may have design alterations from the original design provided: a) such alterations do not affect matters related to classification, or b) if the alterations are subject to classification requirements, these alterations are to comply with the classification requirements in effect on the date on which the alterations are contracted between the prospective owner and the shipbuilder or, in the absence of the alteration contract, comply with the classification requirements in effect on the date on which the alterations are submitted to the Society for approval. The optional vessels will be considered part of the same series of vessels if the option is exercised not later than 1 year after the contract to build the series was signed. 3) If a contract for construction is later amended to include additional vessels or additional options, the date of “contract for construction” for such vessels is the date on which the amendment to the contract, is signed between the prospective owner and the shipbuilder. The amendment to the contract is to be considered as a “new contract” to which 1 and 2 above apply. 4) If a contract for construction is amended to change the ship type, the date of “contract for construction” of this modified vessel, or vessels, is the date on which revised contract or new contract is signed between the Owner, or Owners, and the shipbuilder. (see IACS PR 29 Rev.4) The Society may upon consideration and in agreement with the parties involved decide on the rules to be applied. 1.3.2 For a vessel in a series of identical vessels under construction to the class of, or of a design previously approved by another IACS member society, the Society may accept the design approved by that IACS member society provided a review by the Society has demonstrated that the design in principle meets the safety and reliability level of the Society’s rule requirements for main class. 1.3.3 Where requirements from international maritime conventions have been adopted in the Society's rules, compliance with these requirements is mandatory. 1.3.4 For a vessel where the flag administration undertakes approval and surveys of items covered by the rules, the Society may accept their decisions as basis for assigning class, provided the Society's requirements for main class are complied with. Necessary documentation, such as copies of approved plans, reports and other particulars approved by the flag administration shall be submitted. 1.3.5 A vessel trading solely in domestic waters, or between neighbouring states upon agreement between such states, may be assigned class based on flag administration requirements for domestic service instead of relevant rule requirements. The assigned class shall in such cases be the class notations and service restrictions having least possible deviation from the rule requirements. The vessel will be assigned an additional class notation comprising the letters of the nation in accordance with ISO 3166. Deviations from the rule requirements will only be considered when acceptance by the flag administration has been documented. Deviations from the rule requirements will not be accepted for: — requirements for structural strength, intact stability, machinery installations, steering appliances and electrical systems and equipment covered by main class — optional class notations. 1.3.6 For a vessel intended to be permanently moored on location for production and/or storage of hydrocarbons, the Society may accept decisions by the national administration with jurisdiction over the waters in which the vessel shall operate (the shelf state) as basis for assigning class. 1.3.7 When class is assigned on the basis of a design approved by another IACS member society, the flag administration or according to flag administration requirements or decisions by national authorities according to [1.3.4], [1.3.5] or [1.3.6], information to this effect shall be included in the “Appendix to the Class Certificate” (see [3.1.6]). In case of class being assigned on the basis of flag administration requirements according to [3.1.6] an Memorandum to Owner shall also be issued (see [2.3.7]).
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1.4 Plan approval
1.4.1 Documentation for classification shall be in accordance with the Nauticus Production System (NPS) DocReq. The DocReq is a compilation of all DNV's documentation requirements related to plan approval. The purpose of the DocReq is to provide a basis to verify that selected, safety critical parts of the requirements of the applicable DNV rules and standards are complied with in the design of the vessel. A satisfactory document review is a prerequisite for assignment of DNV class and issue of statutory certificates. The document review shall be complemented by a review of the customer's quality system and by surveys by the Society. The documentation requirements are based on standardized documentation types, which are defined in DNV-RP-A201. 1.4.2 Where subcontractors and suppliers are involved, the customer shall co-ordinate the submission of required plans and documents, as well as co-ordinate any approval comments given by the Society. 1.4.3 Documents subject to approval will be examined by the Society. The results of the examination will be stated in a letter of approval. Comments, conditions and limitations may be stated on the plans returned or in an accompanying letter. 1.4.4 The plan approval may be revoked at any time if subsequent information indicates that the solution was contrary to the Rules.

1.5 Survey during construction
1.5.1 When a vessel is built under the supervision of the Society, the Society will survey: — that the construction and scantlings comply with the rule requirements and the approved plans, and that the required materials are used, — that the materials, components and systems have been certified in accordance with the Rules — that the work is carried out in compliance with the applicable rules and acceptable standards — that satisfactory tests are carried out to the extent and in the manner prescribed by the Rules.
Guidance note: IACS Recommendation No. 47 “Shipbuilding and Repair Quality Standard” - Part A: for New Construction - is regarded as an example of an acceptable standard.
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1.5.2 The survey carried out at the construction site and/or at the sub-suppliers will be at the discretion of the Society and not intended to replace or substitute the essential activities by yards/manufacturers' QA/QC. The scope of survey will be decided as specified in [1.2]. The survey at the customer's premises may consist of a combination of visual inspections, tests, measurements and review of records. 1.5.3 The Society may base its methods and extent of examination on the quality system as implemented in the customer's fabrication processes and as accepted by the Society and, if applicable, in combination with an agreed manufacturing survey arrangement. 1.5.4 The customer shall submit to the Society certificates for materials, components and systems installed in the vessel and as required by the Rules.

1.6 Installation of systems and equipment
1.6.1 Systems and equipment to be installed on newbuildings, which serves as a part of the main functions, shall in general be new.
Guidance note: If second hand equipment complies with applicable rules for the newbuilding, it may upon special consideration be installed on newbuildings, provided the owner has given a written acceptance.
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1.6.2 The extent of participation in the mechanical completion activities by the Society should be clearly identified in the Quality Survey Plan (QSP) submitted by the customer and accepted by the Society. The extent of participation shall be limited to ensuring compliance with the requirement of Classification Rules and applicable statutory requirements.

1.7 Testing and commissioning
1.7.1 Where specified by the rules, testing shall be carried out in the presence of a surveyor, and related requirements for test programmes shall be observed.
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1.7.2 A test programme for harbour and sea trials shall be prepared by the customer and accepted by the Society. The programme shall specify systems and components to be tested, and the testing procedure. The Society may, in order to verify rule compliance, request additional tests and/or data to be recorded. 1.7.3 Procedures for Pre-commissioning, testing and commissioning for all the systems onboard that are covered by the scope of classification shall be prepared by the customer and accepted by the Society. 1.7.4 The tests shall give evidence as to satisfactory operation and performance in accordance with the rules. When testing control and safety systems, failure modes shall be simulated as realistically as possible. 1.7.5 The extent of participation by the Society should be clearly identified in the Quality Survey Plan (QSP) submitted by the customer and accepted by the Society only to ensure compliance with the requirement of Classification Rules and applicable statutory requirements.

2 Assignment of class - existing vessels
2.1 General
A request for class entry of an existing vessel shall be submitted in writing by the customer. The Society reserves the right to accept or decline an application for class entry.

2.2 Applicable rules
Applicable rules for vessels at class entry are given in Sec.5 [2.1].

2.3 Design approval
2.3.1 Before a vessel, which has not been built under the supervision of the Society, is surveyed for assignment of class, the information required in [1.4.1] shall, in general, be submitted for plan approval. For a vessel classed with another IACS member society, the submitted information may be reduced to plans showing the main scantlings and arrangements of the actual hull and machinery installations. 2.3.2 The extent of plan approval for a vessel, which has been classed, or which was previously classed with a non-IACS member society, will be specified in each case. 2.3.3 For a vessel that has been built under the supervision of another IACS member society, the Society may on the basis of an overall consideration and survey, exempt the vessel from rule requirements.

2.4 Class entry survey
2.4.1 Prior to assigning class to an existing vessel, that vessel shall, as a minimum, undergo the surveys pertaining to the age and type of the vessel. The scope of survey will in each separate case be decided by the Society. 2.4.2 Before assigning class, the flag administration will be notified about the class entry. The flag administration may decide that an extended scope of surveys has to be carried out.

3 The class certificate
3.1 General
3.1.1 When satisfied that all requirements corresponding to the class in question have been met, the surveyor will recommend that class is assigned and issue an interim class certificate or the class certificate. 3.1.2 Class may be assigned with Conditions of Class. 3.1.3 The interim certificate will be replaced by a full term class certificate when the Society has confirmed that applicable requirements have been met. 3.1.4 The class certificate is valid provided conditions for retention of class are complied with, as follows: — for a new vessel: to a date not exceeding 5 years from the date of class assignment — for an existing vessel: to a date not exceeding 5 years from the expiry date of the existing certificate — for an existing vessel taken into class: to a date not exceeding 5 years from the date of class assignment or, if the Society accepts the periodical surveys credited by the previous classification society, until the expiry date of the class certificate of the previous classification society — for an interim class certificate: to a date not exceeding 15 months from assignment of class. 3.1.5 Upon request, declarations confirming compliance with the rules may be issued for hull, machinery or specific class notations provided the Society's main class has been assigned.
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3.1.6 An “Appendix to the Class Certificate” will be issued stating assumptions for the assignment of class and restrictions regarding the use of the vessel which were established or assumed at the time of assignment of class. 3.1.7 In case of classification of an existing ship not built under the supervision of the Society, or classification of an existing ship previously classed by the Society, the surveyor will issue the certificate of interim class when he is satisfied that the applicable survey requirements have been met. 3.1.8 When the administration of the Society has examined the surveyor's report and submitted documentation, and is satisfied that the requirements corresponding to the class in question have been met, the class will be assigned and a classification certificate will be issued. Provided the conditions for retention of class are fulfilled and unless the class has been withdrawn in writing at an earlier stage, the class certificate will be valid for 5 years.

3.2 Late commissioning
If the vessel is not immediately commissioned upon completion of the construction, but is laid up for a period, the vessel may be accepted for entry into service upon application by the owner. The vessel may be subject to a condition survey before entering into service. The extent and scope of survey will depend on the time period laid up and conservatory measures taken. Provided the hull and machinery is found in all respects free from deterioration, subsequent periodical surveys will date from the time of the condition survey.

4 The register of vessels
4.1 General
4.1.1 When a vessel has been assigned class, its main particulars and details of the class assigned will be entered in the Society’s “Register of Vessels”. In addition to the class notations, appropriate data related to identification, flag, ownership and other particulars will also be entered. 4.1.2 The class assignment date is entered in the “Register of Vessels”. For vessels built under the supervision of the Society, the due date for the periodical surveys will be calculated from this date. For vessels built under the supervision of another classification society, the due date for the periodical surveys will depend upon the existing periodical survey schedule defined by the previous classification society.

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SECTION 5 RETENTION OF CLASS
1 Conditions for retention of class
1.1 General requirements
1.1.1 The vessel shall be adequately manned, and the hull, machinery, systems and equipment shall be competently handled at all times. 1.1.2 Operation of the vessel shall comply with the assumptions and conditions stated in the “Appendix to the Class Certificate” and in applicable operating manuals. 1.1.3 The vessel, its hull structure, machinery, systems and equipment shall be maintained at a standard complying with the requirements of the rules (see also [1.3]). 1.1.4 Installed systems and equipment carried onboard in excess of the minimum required for main class shall either be maintained to applicable standards, or be removed or disconnected in such a way as to ensure that the installed system or equipment cannot be used. Installed diving systems are subject to special provisions as given in Pt.6 Ch.1 Sec.4 and Pt.7 Ch.1 Sec.6 I in the Rules for Ships. These provisions include transferable diving systems installed temporarily. 1.1.5 Temporary systems and equipment shall comply with relevant requirements in accordance with the assigned class notations of the unit. 1.1.6 The statutory certificates required by applicable international conventions and/or national legislation shall be valid at all times and shall be issued by the Society, the flag administration itself, or by a third party approved by the flag administration, within the limitations set out in Sec.2 [3].

1.2 The customer’s obligations
1.2.1 In order to retain a vessel's class with the Society, the customer shall: — at all times, ensure that the vessel is maintained to the rule standard — submit complete and correct information related to the vessel and its use, which is of significance to the Society for its assessment of the condition of the vessel in relation to the rules — ensure that the vessel is competently handled — subject the ship to unscheduled surveys when deemed necessary by the Society — rectify deficiencies and carry out any Conditions of Class or Retroactive Requirement specified by the Society — subject the vessel to surveys as required by the rules, and provide the necessary facilities for safe execution of surveys — submit complete and correct information on the ownership and management of the vessel, addresses and corresponding administrative information pertinent to the register of vessels — submit correct information on the registration of the vessel — keep onboard and ashore a set of as-built drawings/documentation including subsequent alterations/ conversions — pay all fees and expenses due to the Society. The owner has, together with managers, charterers and operators, a joint and several liability for any such fees and expenses. If a request for services is made by any other party than the owner, that party will, in addition to the owner, be responsible for the payment of the relevant fees — notify the Society when the vessel is laid up or otherwise taken out of service for a period of more than 3 months. 1.2.2 If the hull structure, machinery, systems or equipment covered by classification sustain damage to such an extent that it may be presumed to lead to a Condition of Class (see [2.3]), the Society shall immediately be informed. The vessel shall be surveyed in the first port of call or according to instructions from the Society. The survey shall be of an extent considered necessary by the attending surveyor for ascertaining the extent of the damage. 1.2.3 In case inspections by port or flag authorities reveal deficiencies related to certificates issued by DNV, the customer shall immediately notify the Society.

1.3 Maintenance
1.3.1 The customer shall ensure that the vessel, its hull structure, machinery, systems and equipment at all times is properly maintained.
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Guidance note: Maintenance of the hull structure, machinery, systems and equipment is normally to be in accordance with applicable recognised standards in the industry or in accordance with procedures recommended by the manufacturer.
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1.3.2 The vessel shall have implemented a maintenance system. The maintenance system shall ensure that: — — — — inspections and maintenance are carried out at defined intervals any defect is reported with its possible cause, if known appropriate correction or repair action is taken records of these activities are maintained.

1.3.3 Replacement components and systems shall be delivered with certificates and documentation as required by the rules for the original component or system.

2 Classification society involvement
2.1 Applicable rules
2.1.1 Vessels built under the supervision of the Society shall in general be maintained and repaired in compliance with the rules to which it was constructed, except in cases mentioned in [2.6.2]. 2.1.2 For vessels built under the supervision of another IACS member society, the Society’s rules in force at the same date as those enforced by the other society will be applied. If such date is not known the Society’s rules in force at the “date of build” will be applied. 2.1.3 For vessels other than those covered by [2.1.1] and [2.1.2], the Society's rules for new vessels in force at the time of entry into class will be applied. 2.1.4 Amendments to the rules may be made retroactive. 2.1.5 In cases where rule amendments are made applicable to existing vessels at the first annual, intermediate or renewal survey after a specified date, or after the vessel reaches a specified age, the expiry date of the related survey time window shall determine when the rule amendments become effective.

2.2 Surveys
2.2.1 The objective of a survey shall be to ascertain that the vessel, its hull structure, machinery, systems and equipment are in compliance with the rules and suitable for continued safe and reliable operation. 2.2.2 A survey may consist of a combination of visual inspections, audits, measurements, functional testing, non-destructive testing and review of maintenance and other relevant records. 2.2.3 The minimum extent of prescribed periodical surveys are given in Ch.3. The Society may increase the extent of a survey when deemed necessary in order to ascertain the condition of the vessel.

2.3 Conditions and memoranda
2.3.1 A Condition of Class (CC) will be imposed for the following: — repairs and/or renewals related to damage, defect or breakdown that are sufficiently serious to affect Classification (e.g. grounding, structural damages, machinery damages, wastage over the allowable limits etc.) — supplementary survey requirements — temporary repairs.
Guidance note: When the Society has been authorised to carry out a statutory survey, a Condition on behalf of the flag Administration (CA) will be imposed for specific measures, repairs or surveys that should be carried out within a specific time limit in order to retain the statutory certificate.
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2.3.2 The Society will issue a CC when deemed necessary to carry out examinations in order to ascertain whether damage, a defect or a deficiency has been sustained or is imminent. 2.3.3 A CC may contain the following: — a description of the deficiency, defect, damage or the examination required — required action — due date for the required action to be completed
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— possible temporary requirements imposed until the required action has been completed. Alternatively the CC may refer to a survey report for above details. An approved repair method may be recommended as part of the required action. 2.3.4 If a CC seriously affects the vessel’s safety and reliability, immediate action will be required. Otherwise a time limit will be given for the action to be completed. 2.3.5 A CC will be deleted when the Society, through a survey or received information, has been satisfied that requested action has been satisfactory completed. 2.3.6 For information related to the ship, its machinery and equipment or to rule requirements, the Society may issue an Memorandum to Owner (MO). A MO may supplement information given otherwise, e.g. in the Appendix to the class certificate or the Society’s “Register of Vessels”. 2.3.7 An MO may be used in the following cases: — — — — — — — exemptions from rule requirements accepted deviations from rule requirements limitations on the use of the ship or its equipment defects or deficiencies of no concern to class deleted class notations equipment in excess of class requirements disused information related to agreed survey arrangements.

2.3.8 Outstanding findings may be recorded as a CC or an MO. They will be given in writing at completion of surveys. Findings may also be communicated verbally during the course of surveys. Findings that have been corrected before the survey has been completed will not be recorded as CC. 2.3.9 The Society may at any time modify a CC or MO if considered appropriate. The owner will be notified accordingly. 2.3.10 CC or MO are recorded in the vessel's class status from where they will be deleted when no longer valid. The owner will be notified accordingly. 2.3.11 The owner will be informed of Retroactive Requirements (RR).

2.4 Survey reports and survey status
2.4.1 The surveyor will prepare to the customer reports on surveys carried out. 2.4.2 Survey reports may contain the following information, to the extent applicable in each case: — — — — — — — types of surveys carried out certificates issued, endorsed or extended damage, defects and/or deficiencies observed confirmation that repairs have been completed and accepted by the surveyor CC issued or deleted MO issued or deleted RR issued or deleted.

2.4.3 The Society will make class status reports available to customers on the Society’s Internet website, see Sec.2 [1.6]. It is the customer's responsibility to obtain this information from the Society’s Internet website. Survey and certificate status reports, on paper, may be distributed upon request. 2.4.4 Any document issued by the Society in relation to surveys performed reflects the condition of the vessel at the time of the survey only.

2.5 Damage and repairs
2.5.1 Repairs shall in general be carried out in such a way that the original design and scantlings are restored. Possible design modifications or reduced scantlings based on current rules which are less stringent than those originally enforced, shall be approved by the Society before the repairs are carried out. 2.5.2 Repairs to the hull structure, machinery, systems or equipment covered by the rules shall be carried out by qualified personnel and in compliance with applicable rules, with good engineering practice and under the supervision of a surveyor.
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Guidance note: Guidelines for hull repairs can be found in DN-RP-C101.
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2.5.3 Repairs as stipulated in [2.5.2] may be carried out without the attendance of a surveyor (e.g. during voyage) provided a repair plan is accepted by the Society in advance. A surveyor shall be called for acceptance of such repairs when completed.

2.6 Conversions and alterations
2.6.1 Conversions or alterations of vessels shall in general comply with the rules applicable at the time of class assignment. If current rules are less stringent than those originally in force, then the current rules may be applied. 2.6.2 When conversion or alteration involves modification which: — substantially alters the dimensions or carrying capacity of the vessel (e.g. ≥ 5% change in the unit's displacement), or — changes the type of vessel, or — changes the main class of the vessel, the Society will decide on the rules to be applied. 2.6.3 If the hull structure, machinery, systems or equipment shall be converted or altered, the changes shall be documented and be approved in the same manner as for new vessels.
Guidance note: Alterations to the hull structure, machinery, systems and equipment made possible by amendments of the applicable rules may be undertaken provided the general safety and reliability level required for retention of class will be maintained.
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2.6.4 Conversion or alterations shall take place under the supervision of a surveyor.

2.7 Temporary equipment
2.7.1 The Society shall be informed before the installation of temporary equipment as defined in Sec.1 [2.2]. 2.7.2 Temporary equipment covered by class scope shall be approved and certified in line with [1.1.5]. 2.7.3 For temporary equipment outside class scope, it shall be confirmed that placement of this equipment on board does not negatively affect the safety of the unit.
Guidance note: For the consideration, the following is typically to be considered: — escape ways being blocked — the fire and gas system covers the temporary equipment, the equipment is covered by the ESD logic — the equipment's load is within deck load limits — the definition of hazardous areas takes into account the temp. equipment — the interface to other systems covered by main class does not negatively affect their availability — the equipment has proper sea fastening.
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3 Endorsement and renewal of the class certificate
3.1 Endorsement of the class certificate
3.1.1 The class certificate will be endorsed upon satisfactory completion of annual, intermediate and renewal surveys for main class. The class certificate will not be endorsed unless the following has been dealt with and accepted by the Society: — — — — overdue periodical class surveys overdue continuous survey items overdue Conditions of Class overdue Retroactive Requirement.
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Guidance note: In the case where an overdue survey is related to an optional class notation, the class certificate may be endorsed provided the relevant optional class notation is suspended.
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3.1.2 When the class certificate is endorsed at completion of renewal surveys, the surveyor may extend its validity as necessary but not more than to a date 5 months after the completion date, or after the expiry date of the class certificate, whichever comes first. 3.1.3 In the case where postponement of the renewal survey has been granted upon the customer’s written request, the surveyor will endorse the class certificate and extend its validity, but not more than 3 months beyond the expiry date of the class certificate. 3.1.4 In the case where the main class annual survey is commenced prior to the defined time window, the survey must be completed not more than 6 months after the date of commencement. In such cases the certificate will be endorsed for advancement of anniversary date (due date) for the subsequent annual surveys.
Guidance note: Expiry date of the class certificate may remain unchanged, but additional surveys may be required so that the prescribed survey intervals are not exceeded.
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3.2 Renewal of the class certificate
3.2.1 A new class certificate will replace the existing class certificate when renewal survey has been satisfactory completed and the Society is satisfied that the requirements for retention of class have been met. 3.2.2 The new class certificate will be valid to a date not exceeding 5 years from: — the expiry date of the existing certificate when the renewal survey has been completed within 3 months before the expiry date of the existing certificate, or — the expiry date of the existing certificate when the renewal survey has been completed after the expiry date of the existing certificate, or — the completion date of the renewal survey when the renewal survey has been completed more than 3 months before the expiry date of the existing certificate, or — the completion date of the renewal survey when the renewal survey has been commenced more than 15 months before the expiry date of the existing certificate. 3.2.3 In cases where postponement of a renewal survey has been granted, the new class certificate will be valid to a date not exceeding 5 years from the expiry date of the existing certificate before the extension was granted. 3.2.4 In cases where the renewal survey is carried out concurrently with a conversion as defined in [2.6.2], the validity of the new certificate will be 5 years from the date of completion of the conversion, if so decided by the Society. 3.2.5 For certain vessels the certificate validity and survey intervals may be reduced by the Society.

4 Suspension and withdrawal of class
4.1 General
4.1.1 Class may be withdrawn at any time if the Society finds it justified. 4.1.2 The Society may suspend or withdraw a vessel's class where the conditions for retention of class, have been violated (see [1]). 4.1.3 The decision to suspend or withdraw a vessel's class is made by the Society. However, in cases of automatic suspension, see [4.2.1] and [4.2.2], no individual evaluation is made. Suspension or withdrawal of class may take effect immediately or after a specified period of time. In special cases, the suspension or withdrawal of class may be made with retroactive effect (see [4.2.5]). 4.1.4 If the violation only affects requirements related to optional class notations, the suspension or withdrawal may be limited to these class notations only. 4.1.5 When class is suspended or withdrawn the Society will: — notify the customer in writing — notify the flag administration — make an entry to this effect in the Society’s “Register of Vessels”
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— make the information publicly available. In the cases of class suspension, a time limit will be given for when the class will be withdrawn.

4.2 Suspension of class
4.2.1 The class will automatically be suspended with immediate effect if the renewal surveys for hull, machinery, systems and equipment related to main class are not completed before the expiry date of the class certificate, and no postponement has been granted or unless the vessel is under attendance for completion of the survey. 4.2.2 If the annual or intermediate surveys for main class are not completed within 3 months from the anniversary date of the class certificate, the class is automatically suspended with immediate effect, unless the vessel is under attendance for completion of the survey. 4.2.3 The Society may decide to suspend a vessel's class if the vessel is deemed to be unable to continue safe and reliable operation, e.g. as a result of a major casualty. 4.2.4 If any outstanding debt owed to the Society is not paid within a notified date, the Society may suspend the vessel's class with immediate effect. 4.2.5 In addition to the conditions laid down in [4.2.1], [4.2.2] and [4.2.3], a vessel's class may be suspended with immediate effect in cases where: — repair of deficiencies has not been carried out or otherwise dealt with in an appropriate manner, or — repair of deficiencies has not been surveyed and accepted by the surveyor, — other requirements imposed by the Society. 4.2.6 Class will not be automatically suspended according to [4.2.1] or [4.2.2] whilst a vessel is laid up, provided the requirements in Ch.3 Sec.1 [2.3] for lay-up surveys are complied with. 4.2.7 If a ship has been detained as a result of port state inspections twice in a two year period and the deficiencies are found to be serious, the Society may decide to suspend or delete class.

4.3 Reinstatement following class suspension
4.3.1 If the overdue surveys leading to class suspension as given in [4.2.1], [4.2.2] and [4.2.3] or requirements as given in [4.2.5] are carried out within the specified time, the class will be reinstated provided the following is met: a) The result of the survey is such that all observed deficiencies are satisfactory rectified. The Society may after consideration accept that minor deficiencies are pending to be carried out. b) No overdue periodical surveys or overdue Conditions of Class at that time. 4.3.2 The Society reserves the right to decline an application for reinstatement of class. 4.3.3 When the class is reinstated, the Society will confirm this in writing to the customer and to the flag administration.

4.4 Withdrawal of class
4.4.1 The class will be withdrawn at the customer's request. 4.4.2 If the overdue surveys specified in [4.2.1], [4.2.2] and [4.2.3] or required repairs as given in [4.2.5] are not carried out within the specified time after the class suspension, the Society will withdraw the vessel's class. 4.4.3 When a vessel proceeds to sea without having rectified a condition of class which was required to be dealt with before leaving port, the class will be withdrawn with immediate effect. 4.4.4 If the Society becomes aware that a vessel continues operation with serious damage or defects in violation of class requirements, the class may be withdrawn with effect from the time this became known to the Society. The class withdrawal may be made retroactive. 4.4.5 When it is considered that a customer's failure to comply with rule requirements is sufficiently serious or fraudulent the withdrawal of class may, at the discretion of the Society, be extended to include other vessels controlled or operated by the same customer. 4.4.6 If the outstanding debt owed to the Society is not paid within a notified date, the Society may withdraw the vessel's class with one month's written notice. This also applies when the obligation to pay rests with a yard or with the vessel's previous owners. In special cases a shorter notice may be given.
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4.4.7 If the customer makes a general assignment for the benefit of his creditors or if any proceedings are commenced in court or any order or judgement is given by any court for liquidation, winding up of the customer, the Society may withdraw the class with immediate effect. 4.4.8 For vessels having statutory certificates issued by third parties, except in those cases defined in Sec.2 [3.1], the class may be withdrawn.

4.5 Re-assignment of class following class withdrawal
4.5.1 In all other cases than that given in [4.4.1], and if the circumstances leading to withdrawal of class no longer exist, a vessel's may be re-assigned class upon written request. The extent of survey will in such instances be decided by the Society. 4.5.2 The Society reserves the right to decline an application for re-assignment of class. 4.5.3 A new class certificate will be issued when the survey has been satisfactory completed and the Society is satisfied that the requirements for retention of class have been met. 4.5.4 When the vessel is re-assigned class, the Society will confirm this in writing to the customer and to the flag administration and make the information publicly available.

5 Change of owner or manager
5.1 General
5.1.1 A vessel shall retain class when transferred to another owner or manager. The previous customer shall give the Society immediate notice, in writing, of such transfers. Obligations according to the rules shall remain with the previous customer until the Society is in receipt of such notice, in writing. See [1.2]. 5.1.2 Class notations and survey arrangements based on certification of the management of operations will be deleted automatically when the management of a vessel is transferred.

6 Force majeure
If due to force majeure, the vessel is not in port when surveys become overdue the Society may allow the vessel to sail, in class, directly to an agreed discharge port and then, if necessary, in ballast to an agreed repair facility at which the survey can be completed. In this context the “Force Majeure” means damage to the vessel, unforeseen inability of surveyors to attend the vessel due to governmental restrictions on right of access or movement of personnel, unforeseen delays in port or inability to discharge cargo due to unusually lengthy periods of severe weather, strikes, civil strife, acts of war or other force majeure.

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SECTION 6 CERTIFICATION OF MATERIALS, COMPONENTS AND SYSTEMS
1 General
1.1 General
1.1.1 The scope of classification requires that specified materials, components and systems intended for the vessel are certified according to the rules. The objective of certification shall ensure that materials, components and systems used in vessels to be classed by the Society comply with the rule requirements. Certification normally includes both plan approval and survey during production and/or of the final product (see [2.2] and [2.3]). 1.1.2 The applicable chapters of the rules define the extent of the certification that is required for classification.

1.2 Requirements for manufacturer
1.2.1 Manufacturers of materials, components and systems of categories not covered by Sec.4 [1.2] shall be considered for approval according to criteria established by the Society, as applicable. 1.2.2 Quality control of materials, components and systems, shall be traceable and documented in writing. Further, quality control shall be carried out by qualified personnel at facilities and with equipment suitable for that control.

2 The classification involvement
2.1 General
2.1.1 Certification of materials, components and systems will be documented by the following types of documents: 1) Det Norske Veritas Product Certificate (NV): A document signed by a surveyor of the Society stating: — — — — conformity with rule requirements that tests are carried out on the certified product itself that tests are made on samples taken from the certified product itself that tests are performed in presence of the surveyor or in accordance with special agreements.

2) Det Norske Veritas Type Approval Certificate (TA): A document validated and signed by a surveyor of the Society stating: — conformity with rule design requirements. 3) EU Mutual Recognition Type Approval Certificate: A document validated and signed by a surveyor of a recognised organisation (RO) within EU stating: — conformity with the commonly agreed design requirements for Mutual Recognition as laid down in the individual RO's governing documents.
Guidance note: These certificates are normally mutually accepted by all EU RO's. Covers only agreed components. These are at any time listed in the overview of Type Approval for Mutual Recognition on the DNV Internet.
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4) Works Certificate (W) A document signed by the manufacturer stating: — — — — conformity with rule requirements that tests are carried out on the certified product itself that tests are made on samples taken from the certified product itself that tests are witnessed and signed by a qualified department of the manufacturers.

5) Test Report (TR) A document signed by the manufacturer stating:
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— conformity with rule requirements — that tests are carried out on samples from the current production. The applicable chapters and sections of the rules specify which of the above mentioned documents are required. 2.1.2 Where the rules require works certificate or test report, the surveyor may at any time require the tests to be carried out in his presence and/or that the surveyor check elements of the production control. 2.1.3 For identification and traceability, certified products shall be marked in accordance with the description given in the product certificate and as specified by the applicable chapters of the rules. 2.1.4 For certain components and systems the certification will be based on defined internationally acceptable standards and certification schemes as defined in applicable chapters of the rules. Compliance with the requirements of the standard shall be documented as required by that standard. 2.1.5 To ensure an efficient, cost effective and correct certification process, a certification agreement shall normally be established between the Society and the manufacturer of NV certified products. Such agreement may be part of a manufacturing survey arrangement (see [2.5]) and shall include information on the procedures for plan approval and survey and to specify information that shall be transferred between the customer and the Society.

2.2 Plan approval
2.2.1 The plan approval of materials, components and systems shall either be on a case by case basis or follow the procedure for type approval, see [2.3]. 2.2.2 When the case by case procedure is used, documentation of the design shall be submitted for approval for each application as required in the applicable chapters of the rules. 2.2.3 A plan approval letter or design verification report will be issued by the Society when compliance with the requirements for the design has been confirmed.

2.3 Type approval
2.3.1 Type approval is a procedure for plan approval. Type approval can be applied to: — — — — products groups of products systems retention survey.

This procedure should normally be used for approval of standard designs. 2.3.2 The type approval procedure may consist of the following elements: — — — — plan approval initial survey type testing issue of a type approval certificate.

The type approval procedure used by the Society is described in Standard for Certification No. 1.2. 2.3.3 When the type approval procedure is used, the following shall be submitted for approval as required in type approval programmes and the applicable chapters of the rules: — documentation of the design — results of type testing normally witnessed by a surveyor. A type approval certificate will be issued by the Society when compliance with the design requirements is confirmed. The type approval certificate has a validity of 2 or 4 years depending on type of material, component or system for which the certificate is issued. 2.3.4 For certain products and systems as defined in applicable chapters of the rules, only type approval is required. For these products and systems no survey is required, i.e. no product certificate is required. 2.3.5 For certain products and systems as defined in the applicable chapters of the rules, type approval is a mandatory procedure for plan approval. 2.3.6 Products and systems manufactured for stock shall normally be type approved. 2.3.7 For type approved products, where the basis for approval is the rules of the Society, plans and technical descriptions of the product need not be submitted for approval for each vessel unless otherwise stated as a
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condition on the type approval certificate. In such cases only the arrangement or system plans, interface plans and those plans mentioned on the type approval certificate shall be submitted for approval.

2.4 Survey
2.4.1 The survey of materials, components and systems shall either be on a case by case basis or on the basis of an established manufacturing survey arrangement (MSA), see [2.5]. 2.4.2 When the case by case procedure is used, the survey shall be performed on the basis of approved design documentation for the actual application and as required in the applicable chapters of the rules. Compliance with the approved design documentation and applicable requirements will be documented by certificates as required in the applicable chapters of the rules. 2.4.3 When the survey is based on an MSA, the survey shall be performed on the basis of approved design documentation, applicable rule requirements and in accordance with requirements and procedures laid down in the MSA. Compliance with the approved design documentation and applicable requirements shall be documented by certificates as specified in the MSA and/or as required in the applicable chapters of the rules.

2.5 Manufacturing survey arrangement
2.5.1 When the procedures and processes of a manufacturer's quality system meet the requirements of the rules, a manufacturing survey arrangement (MSA) may be established with the manufacturer as an alternative to the survey described in the applicable rule chapters. 2.5.2 The MSA shall be described in a document stating the requirements, scope, acceptance criteria, documentation and the roles of the Society and the manufacturer in connection with the survey. 2.5.3 When it is agreed through an MSA that the majority of the required surveys and test are completed without the presence of a surveyor, it required that the manufacturer has in operation a quality system certified by an accredited certification body to ISO 9001, or equivalent. 2.5.4 When establishing an MSA, an initial assessment of the manufacturer's ability to control product quality and to comply with the scope, requirements and criteria laid down in the MSA will be performed. The extent and frequency of periodical assessments of the manufacturer will be included in the MSA. 2.5.5 A MSA is normally given a validity of 4 years. When the MSA is based on a certified quality system, the MSA automatically becomes invalid if the quality system certificate no longer is valid.

3 Suspension and withdrawal of certificates
3.1 General
3.1.1 A product certificate, type approval certificate or approval of manufacturer certificate may be suspended or withdrawn at any time if the Society finds it justified. 3.1.2 The decision to suspend or withdraw a certificate is made by the Society. Suspension or withdrawal of a certificate may take effect immediately or after a specified period of time. In special cases, the withdrawal of a certificate may be made with retroactive effect. 3.1.3 When a certificate is suspended or withdrawn the Society will: — notify the customer in writing — make the information publicly available. In the cases of suspension, a time limit will be given for when the certificate will be withdrawn.

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SECTION 7 LEGAL PROVISIONS
1 Liability and jurisdiction
1.1 Limited liability
1.1.1 If any person suffers loss or damage which is proven to have been caused by any negligent act or omission of the Society, then the Society shall pay compensation to such person for his proven direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question. The maximum compensation shall never exceed USD 2 million. 1.1.2 The above limitation of liability shall also apply to the relevant Flag administration, for any services provided hereunder on behalf of such Flag administration, to the same extent as it applies to the Society. 1.1.3 A person relying on any work subject to the Rules cannot bring any claims in excess of the above limitation of liability against the Society and/or the Flag Administration and nothing herein shall be construed as granting a party the right to cumulate or aggregate this limitation of liability. Further, said person undertakes to pay to the Society any sums awarded against the Flag Administration in respect of claims, losses, damages, costs, expenses and liabilities, and shall save, indemnify, defend and hold harmless the Society in every respect, if a claim is brought against the Flag Administration in breach of this obligation. 1.1.4 In this provision the “Society” shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas.

1.2 Use by other parties
These rules are under the sole ownership rights and copy-rights of the Society. It is prohibited by anyone else than the Society to offer and/or perform classification or other services, wholly or partly, on the basis of and/ or pursuant to these rules. The Society is not responsible for the consequences arising from the possible unauthorised use of the Rules by others.

1.3 Governing law
These rules, the classification of the vessel and the relationship between DNV and other parties shall be governed by Norwegian law.

1.4 Venue
Any dispute arising in relation to or as a consequence of these rules shall only be resolved by the courts of Norway, the Municipal Court of Oslo being the proper venue.

DET NORSKE VERITAS AS

Offshore Service Specification DNV-OSS-101, October 2014 Ch.2 Sec.1 Design and construction requirements for 1A1 MOU main class – Page 45

CHAPTER 2 DESIGN AND CONSTRUCTION PROVISIONS
SECTION 1 DESIGN AND CONSTRUCTION REQUIREMENTS FOR 1A1 MOU MAIN CLASS
1 General
1.1 Introduction
1.1.1 This section identifies design and construction requirements common to all types of mobile offshore units. Units complying with these requirements will be assigned a main character of class @1A1 followed by a description of the basic design concept of the unit, e.g. column-stabilised unit. 1.1.2 The following discipline areas are covered within main class: — — — — — — — — — safety principles and arrangement materials hull design and fabrication temporary mooring and towing stability, watertight and weathertight integrity marine and machinery systems and equipment electrical systems and equipment instrumentation and telecommunication systems fire protection.

1.1.3 Systems and structures will be certified or classified based on the following main activities: — — — — design approval certification of materials and components survey during construction and installation survey

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