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The Third Chemical Engineering Construction Company of China ( TCC)

VIETNAM OIL AND GAS CORPORATION (PETRO-VIETNAM) DUNG QUAT REFINERY (DQR) PROJECT

Document No.:
<

br />8474L

- 800

-17059

-6800

-MS 005-

REV.A

METHOD STATEMENT FOR WASTE HEATER BOILER ERECTION

ocumentt Class : Z

REVIEW BY: CODE 1 CODE 2 Revise and Resubmit

TPC

REVIEW BY PMC/DQR CODE 1 CODE 2 Revise and Resubmit Review with comments Work May Proceed/Revise &Resubmit Review Without Comment Work May Proceed

Review With Comments Work May Proceed/Revise &Resubmit Review Without Comment Work May Proceed

CODE 3

CODE 3

STAMP

STAMP

SIGNATURE

SIGNATURE

NAME

NAME

DATE

DATE

REVIEW STATUS

A REV.

June 15,07 DATE

Issue for Review STATUS ORIGINATOR (NAME & VISA) DOCUMENT REVISIONS CHECKER (NAME & VISA) APPROVER (NAME & VISA)

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The Third Chemical Engineering Construction Company of China ( TCC)

CONTENT

1. GENERAL 2. ERECTION sequence 3. LAYOUT Plan for Stack Field Assembly 4. RECEIVING inspection on the field for the stack 5. ASSEMBLY the first piece with the second piece of the stack 6. INSTALL Platforms and Ladders 7. FINAL Inspection 8. ORGANIZATION CHART 9. CONSTRUCTION Schedule 10. LIST Of Equipment & Tools 11. MANPOWER Plan 12. JOB SAFETY ANALYSIS SHEET

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The Third Chemical Engineering Construction Company of China ( TCC)

1. GENERAL The stack’s total length is 46.9m,bottom diameter is 6500mm,middle diameter is 4950mm,upper end diameter is 3410mm.The stack with two reduce parts, 9 platforms. The stack is delivered to the field in three pieces, one piece of the stack bottom body’s length is 21.35m (the first piece),one piece of the stack middle body’s is 21.35m(the second piece), one piece of the stack top body’s is 22m(the third piece). The connection method between the first piece and the second piece is by welding. Connection method between the second piece and the third piece is by bolting. 2. ERECTION sequence Support and fit-up the first piece and the second piece on the ground, keep the 0° at the up direction, align the two pieces in line and make sure longitudinal levelness. After alignment of the first piece with the second piece, install the platforms and ladders and then lift by Heavy lifting subcontactor. Alignment the third piece on ground and install top platform. Lifting the third piece of stack and use the 43m platform for alignment and bolting. 3. LAYOUT Plan for Stack Field Assembly Layout plan stack field assembly see attachment-1. Temporary support for fitting up the stack a. Temporary support 1 : the height is 220mm with one piece, four crossties, 220mm*160mm*3000mm,four wedges. b. Temporary support 5 & 6: the height is 500mm with two pieces ; the shape of “井” support is used with 15 pieces of crosstie, the crosstie’s dimension is 220mm*160mm*3000mm,on the up of the crosstie place four wedges. c. Temporary support 2,3 & 4: the height is 995mm with three pieces, fabricated by shaped steel. Details of the temporary support 2, 3 & 4 please see the attachment sketch. 4. RECEIVING inspection on the field for the stack Check three pieces of the stack’s orieniation deviation ,especially the third piece,check the flue gas inlet nozzle relatively location from the stack center line. b. Check three pieces of the stack’s length deviation,the max deviation ≤20mm. c. Check both end of each piece of the stack’s roundness deviation and circle length deviation.the max circle length deviation≤15mm, the max roundness deviation ≤50mm (the deviation = the max diameter- the min diameter) d. Check joint surface levelness and shell verticality of each pieces of the stack’s straight deviation. e. Check pre-welding parts on the stack body for the platforms and ladders. f. Check the connection flange of the first piece and the second piece aswell as the stack body ‘s straight deviation. 5. ASSEMBLY the first piece with the second piece of the stack. a. Check the roundness and circle deviation of the joint, evenly tack weld 12 eye -plates on the stack near the joint to fit-up and align the joints with evenly mismatch.
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a.

The Third Chemical Engineering Construction Company of China ( TCC)

Align and Adjust the stack body’s mismatch and the welding joint’s clearance, tack weld the joint after checking. c. Joint Welding: Root pass use electrode φ3.2mm, filling and cap weld using electrode φ3.2mm. Back gouging insde weld and then re-weld. d. NDE for the welding Joint. 6. INSTALL Platforms and Ladders First, install the support of the platforms, ensure all supports on the level and at righ position. b. Second, install platform, grating and ensure the right relatively location for the platform with the support as well as platforms with the shell of the stack. c. 3At last,install the ladders, ensure parallelism the ladders with the center line of the stack 7. FINAL Inspection Check the stack ‘s concentric deviation after connecting the first piece with the second piece. b. Check the welding joint and clean the joint surface. c. Check weld joints of ladder and clean any splash and slags. 8. ORGANIZATION CHART See attachment- 2 9. CONSTRUCTION Schedule See Attachment-3 a. a.

b.

10. LIST Of Equipment & Tools No . 1 2 3 4 5 6 7 8 9 10 Description Type & Specification unit piece piece piece piece piece piece piece piece piece piece Q'ty 1 4 1 15 1 1 1 1 2 4
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Remark

Truck crane 25t welding machine Welding Rod Portable Drier Grinding machine Theodolite Level Transit Tape 30m Tape 10m Tape 5m Portable Electrode

The Third Chemical Engineering Construction Company of China ( TCC)

1 2 3 4 5 6 7 8 9 10 11 12

Dry Oven Plate Plate Plate I type Steel Angle steel Steel wire rope Shackles Crosstie Wedge Flat wedge Round wedge Fit-up Clamp Rope

δ=16 δ=12 δ=10 Ⅰ20 ∠75×75×8 φ15.5 2T 160×220×3000 160×220×400

φ16

M2 M2 M2 M M M piece piece piece piece piece piece M

54 20 240 20 40 16 100 24 12 100

11. MANPOWER Plan No 1 2 3 4 5 6 7 8 9 Craft Mechanical supervisor Material controller Safety supervisor Scaffolder Welder Riveter Millwright Electrician Rigger Amount 2 1 1 2 4 2 1 2 2
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The Third Chemical Engineering Construction Company of China ( TCC)

12. JOB SAFETY ANALYSIS SHEET

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