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NDE-04-MAGNETIC PARTICLE EXAMINATION PROCEDURE


TianDa

Doc. No.: HTD/NDE-04

QC PROCEDURES

Edition: Revision: Page:

2011 1 1 of 11

Shop Construction and Field Site Assembly of Pressure

Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure

Magnetic Particle Examination Procedure

Rev. No.

Prepared By

Date

Reviewed & Approved By

Date

TianDa

Doc. No.: HTD/NDE-04

QC PROCEDURES

Edition: Revision: Page:

2011 1 2 of 11

Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure

Statement of Demonstration Certification

We hereby certify that the Magnetic Particle Examination Procedure (HTD/NDE-04 , 2011/Rev.0) has been demonstrated on a test specimen with known defects to the satisfaction of the Authorized Inspector (AI) according to T-150 of ASME Code Section V, as required by Appendix 6 of Section VIII, Div.1.

Specimen No.: Demonstration Report No.:

Certified by NDE Level III: AI:

Date: Date:

TianDa

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2011 1 3 of 11

Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure 1. 1.1 General

This procedure is applied to the magnetic particle examination of ferromagnetic materials and welds for the items constructed according to ASME Section Ⅷ, Div.1. The magnetic particle examination method is suitable for detecting cracks and other discontinuities on or near the surface in ferromagnetic materials. This procedure is applied to wet continuous magnetization by yoke, which shall only be applied to detect discontinuities that are open to the surface of the part. This procedure shall be certified by demonstration to the satisfaction of the AI prior to implementation. Personnel The NDE personnel who is engaged in magnetic particle examination shall be qualified and certified according to the TianDa’s Written Practice (HTD/NDE-01). Written Procedure Requirements Requirements Magnetic particle examination shall be performed in accordance with this written procedure (and the instruction cards as supplementary means), which shall, as a minimum, contain the requirements listed in Table 1. The written procedure shall establish a single value, or range of values, for each requirement.

1.2

1.3

1.4

2. 2.1

3. 3.1

TianDa

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Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure

Table 1 Requirements of a Magnetic Particle Examination Procedure
No. 【1】 【2】 【3】 【4】 【5】 【6】 【7】 【8】 【9】 【10】 【11】 【12】 【13】 【14】 【15】 【16】 【17】 Requirements Magnetizing technique Magnetizing current type or amperage outside range specified by the Article or as previously qualified Surface preparation Magnetic particles (fluorescent/visible, particle size, wet/dry) Method of particle application Method of excess particle removal Minimum light intensity Existing coatings, greater than the thickness demonstrated Nonmagnetic surface contrast enhancement, when utilized Performance demonstration, when required Examination part surface temperature outside of the temperature range recommended by the manufacturer of the particles or as previously qualified Shape or size of the examination object Equipment of the same type Temperature (within those specified manufacturer or as previously qualified) Demagnetizing technique Post-examination cleaning technique Personnel qualification requirements by color, Essential Variable ● ● ● ● ● ● ● ● ● ● ● ○ ○ ○ ○ ○ ○ Nonessential Variable Remark* 7.1.1 4.3.1 9.1 5.1 5.2 5.3 5.4 7.1.4 NA 9.6 9.1.4 5.4.2 1.4 5.3 13 4.1 5.3 11 12 2.1

* The related clause stipulating the requirement. 3.2 Procedure Qualification When procedure qualification is specified, a change of a requirement in Table 1 identified as an essential variable from the specified value or range of values, shall require requalification of the written procedure. A change of a requirement identified as a nonessential variable from the specified value, or range of values, does not require requalification of the written procedure. All changes of essential or nonessential variables from the value, or range of values, specified by the written procedure shall require revision of, or an addendum to, the written procedure.

TianDa

Doc. No.: HTD/NDE-04

QC PROCEDURES

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2011 1 5 of 11

Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure 4. 4.1 4.2 Magnetization Equipment and Calibration

The magnetizing equipment to be used is Yoke, with Type B310 (made by BeiJing). Frequency of calibration Magnetizing Equipment with an ammeter shall be calibrated at least once a year, or whenever the equipment has been subjected to a major electric repair, periodic overhaul or damage. If equipment has not been in use for a year or more, calibration shall be done prior to first use.

4.3 4.3.1

Calibration for lifting power of Yokes Prior to use, the magnetizing power of electromagnetic yokes shall have been checked within the past years. The yoke shall be checked whenever it has been damaged or repaired. Each alternating-current electromagnetic yoke shall have a lifting power of at least 10lb (4.5kg) at the maximum pole spacing that will be used.

4.4

Calibration for Light Meter The digital light meter used for measuring light intensity in the examination area during the specified time interval, shall be calibrated once a year or whenever the meter has been repaired by qualified calibration organization.

5. 5.1

Examination Medium The examination medium shall be the finely divided ferromagnetic particles which have high permeability and low retentiveness. The size and shape of the magnetic particles shall be suitable for forming magnetic particle indications. The black magnetic particles in oil as suspension vehicle (Type YD-BO), made by MARKTEC(WUJIANG) Co., Ltd., shall be used. The fluid medium for the magnetic suspension fluid shall be conditioned water in a

5.2

5.3

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2011 1 6 of 11

Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure

sprayer. The temperature of the wet particle suspension and the surface of the part shall not exceed the temperature range recommended by the manufacturer of the particle or as previously qualified (57 ℃). 5.4 5.4.1 Concentration of wet magnetic particle suspensions The bath concentration shall be maintained within 1.2 to 2.4 ml per 100ml of vehicle for non-fluorescent particles unless specified by the particle manufacturer. In order to enhance the contrast of examined area, the contrast enhancer solvent (HD-MPA manufactured by MARKTEC(SHANGHAI) Co., Ltd.) may be sprayed over the examined surface before applying the black magnetic suspension vehicle. Steps of magnetic particle examination The steps of magnetic particle examination are as following: ①Surface Preparation ④ Applying
magnetic particle suspension vehicles

6.

②Spraying Contrast Enhancer ⑤ Viewing under adequate light ⑧ Demagnetizing when required

③ Magnetizing
⑥ Evaluating indications

⑦ Recording indication

⑨ Post treatment

⑩Making Report 7. 7.1 7.1.1 Magnetization Procedure Yoke Technique The alternating current electromagnetic yokes shall be used for localized magnetization to form a longitudinal magnetic field. Pole spacing shall not exceed 200mm and be less than 75mm. The field strength of yokes can be empirically determined by measuring its lifting power.

7.1.2 7.1.3

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Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure 7.1.4

Wet particles applied from aerosol spray cans may be applied before and/or after magnetizing current is applied. Direction of magnetization At least two separate examinations shall be carried out on each area. The second examination shall be with the lines of magnetic flux approximately perpendicular to those used for the first examination in that area.

7.1.5

7.1.6

The area to be examined shall be restricted to the area which is equal to 1/4 maximum pole spacing on both sides of the line through two poles. The pole spacing shall at least have 1in. ( 25mm ) overlap for adjacent areas. Magnetic Field Adequacy The applied magnetic field shall have sufficient strength to produce satisfactory indications, but shall not be so strong that it causes masking of relevant indications by non-relevant accumulations of magnetic particles. Factors that influence the required field strength include the size, shape and material permeability of the part; the technique of magnetization; coatings; the method of particles application ; the type and location of discontinuities to be detected. Examination Requirements Surface conditioning and Preparation Satisfactory results are usually obtained when the surface are in the as-welded, as-rolled, as-cast, or as-forged conditions. However, surface preparation by grinding or machining may be necessary where surface irregularities could mask indications due to discontinuities. Prior to magnetic particle examination, the surface to be examined and all adjacent areas within at least 1in.(25mm) shall be dry and free of all dirt, grease, lint, scale, welding flux and spatter, oil, or other extraneous matter that could interfere with the examination.

8. 8.1

9. 9.1 9.1.1

9.1.2

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Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure 9.1.3

Cleaning may be accomplished using detergents, organic solvents, descaling solution, paint removers, vapor degreasing, sand or grit blasting, or ultrasonic cleaning methods. If nonmagnetic coatings are left on the part in the area being examined, it shall be demonstrated that indications can be detected through the coating material and existing maximum coating thickness applied. When the actual coating thickness is greater than that qualified, it shall be re-qualified. When AC yoke technique is used, the demonstration must be in accordance with Mandatory Appendix Ⅰof Article 7 of ASME Code SectionⅤ. Unless specified on the drawings or other technical documentation, the magnetic particle examination shall be carried out on the parts with finished surface condition, or finished-machined condition and final heat treatment condition. The small opening, slots or holes in the parts can be blocked to prevent the magnetic particle from getting into. Examination shall be conducted with sufficient overlap (at least 10%) to assure 100% coverage at the established sensitivity. The repaired area shall be reexamined according to the original examination procedure. A minimum light intensity of 100fc (1000Lx) is required to ensure adequate sensitivity during the examination and evaluation of indications. The light source technique used, and light level verification is required to be demonstrated onetime, documented, and maintained on file. Evaluation of indications and acceptance standards Evaluation of indications Indications will be revealed by retention of magnetic particles. All such indications are not necessary imperfections, however, since excessive surface roughness, magnetic permeability variations (such as at the edge of heat affected zones), etc., may produce similar indications. An indication is the evidence of a mechanical imperfection. Only indications which

9.1.4

9.2

9.3

9.4

9.5 9.6

10. 10.1

TianDa

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Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure

have any dimension greater than 1/16in. (1.5mm) shall be considered relevant. (a) A linear indication is one having a length greater than three times the width. (b) A rounded indication is one of circular or elliptical shape with a length equal to or less than three times the width. (c) (d) 10.2 Any questionable or doubtful indications shall be reexamined to determine whether or not they are relevant. Broad areas of particle accumulation which might mask indications from discontinuities are prohibited, and such areas shall be cleaned and reexamined.

Acceptance standards (According to Section Ⅷ, Div.1) these acceptance standards shall apply unless other more restrictive standards are specified for specific materials or applications. Acceptance Standards for Pressure Vessels: All surfaces to be examined shall be free of: (a) Relevant linear indications; (b) Relevant rounded indications greater than 3/16in. (5mm); (c) Four or more relevant rounded indications in a line separated by 1/16 in.(1.5mm) or less, edge to edge;

10.2.1

(d) An indication of an imperfection or more relevant rounded indications in a line separated by 1/16in.(1.5mm)or less, edge to edge; it may be larger than the imperfection that causes it; however, the size of the indication is the basis for acceptance evaluation. 11. Demagnetization Do the magnetization on the work piece,make the electromgnetic yoke move awaye from it gradually and cut off the power to stop magnetization at the place where is 1 m from it. 12. Cleaning method after examination Using cloth to clean and remove the impurity on the work piece such as remnant contrastaid

TianDa

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2011 1 10 of 11

Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure 13. 13.1 Records and report

The examination details and results shall be recorded by the operator. When necessary, the permanent records may be made by adhesive tape, photograph or other means. NDE report shall be prepared by the NDE Level II and approved by the NDE Level Ⅲ prior to submission to the AI for acceptance. Nonrejectable Indications.Nonrejdctable indications shall be recorded as specified by the referncing Code Section, Rejectable Indications. Rejectable indications shall be recorded.As a minimum,the type of indications (linear or rounded), location and extent (length or diameter or aligned) shall be recorded. Examination Records For each examination, the following information shall be recorded: (a) procedure identification and revision (b) magnetic particle equipment and type of current (c) magnetic particles (visible or fluorescent,wet or dry) (d) examination personnel identity and if required by referencing Codi Section, qualification level (e) map or record of indications per T-792 (f) material and thickness (g) lighting equipment

13.2

13.3

13.4

13.5

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2011 1 11 of 11

Shop Construction and Field Site Assembly of Pressure Vessels and Parts to ASME Boiler and Pressure Vessel Code Section VIII Division 1 Conformance

Magnetic Particle Examination Procedure (h) date of examination


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