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Thursday, December 17, 2009

TANK ERECTION PROCEDURE

*note: this is the sample document for the related job only
*author:


TABLE OF CONTENTS

1. SCOPE
2. APPLICABLE CODE
3. FOUNDATION
4. CONSTRUCTION PROCEDURE
4.1. BOTTOM PLATE
4.2. SHELL PLATE
4.3. ROOF STRUCTURE
4.4. ROOF PLATE
4.5. OUTER RAFTER ERECTION PROCEDURE
4.6. WIND PROTECTION OF SHELL PLATE AND ROOF STRUCTURE
4.7. TEST
4.8. CALIBRATION
4.9. ATTACHMENT


1. SCOPE
This specification covers construction (erection) procedure for field erection of Two (2) nos additional crude Storage Tanks.

2. APPLICABLE CODE

a. ASME IX: : Welding & Brazing Qualification

b. B31.3 : Chemical Plant, Petroleum and Refinery piping.

c. ASME V : Non Destructive Testing

d. API650 : Welded Steel Tank for Oil Storage.

e. BS 2654 : Vertical Steel Welded Non-refrigerated Storage Tank with Butt welds for the Petroleum Industry.

f. Client Technical Standard

PTS-20.156A :Standard Tank Vol. 1 – Part 1
PTS-20.156B :Standard Tank Vol. 1 – Part 2
PTS-20.156C :Standard Tank Vol. 2 – Part 3

g. Contractor Specification
: Field Inspection Procedure Specification
: Water Filling Test
: Quality Plan

3. FOUNDATION
The following item of the foundation shall be confirmed and accepted by warga Hikmat QC and Client rep (PPMSB) prior to erection of the tanks.
(Refer to PTS-20.156A – 09.00.00- Foundation)

i. Level and Direction of the foundation
ii. Camber and flatness of foundation surface

4. CONSTRUCTION PROCEDURE

(Refer to PTS-20.156B – 10.00.00 Erection & 10.02.00 Erection Procedure)

4.1 BOTTOM PLATE

(1) Arrangement and welding of the Bottom plate shall conducted as per Bottom Plate Welding Sequence in Attachment 1 and detail procedure as follow;
i. Marking of centre line.
ii. Bottom plate arrangement as per welding sequence and applicable drawing.
iii. Fitting between shell and bottom plate.

(2) Bottom plate shall be welded by back step or skip welding method.

(3) To prevent welding distortion, restraint jigs or reinforcing beams shall be used.

4.2 SHELL PLATE

(1) Prior to erection of shell plate, following marking shall be performed on the bottom plate as shown in Fig. 1 & Fig. 2

i. Marking of radius for shell erection. (The marking shall be larger than the diameter shown in the drawing, considering weld shrinkage of shell plate).
ii. Radius for checking the roundness of shell plate shall be marked.
iii. The marking allotment of 1st course of shell plate shall be carried out.
(2) Level, roundness and verticality shall be inspected after completion of erection of 1st course of shell plate.

(3) Shell plate from second to fifth course and top angle shall be erected.


(4) Welding of shell plate shall be performed from lower course, and vertical joint shall be welded prior to the horizontal joint.

4.2.1 DETAIL ERECTION PROCEDURE OF SHELL PLATE.
The sequence of erection and welding are as follow:

1) Erection of 1st course.

2) Check level, verticality and roundness of 1st course.


3) I) Erection of 2nd course. After completion of erection of second course, the vertical joint of 1st course shall be welded.
ii) Vertical joint of 2nd course shall be aligned.
iii) Local departure, tolerance cut horizontal and vertical shell seams shall be checked.

4) i) Erection of 3rd course. After completion of erection of third course, the vertical joint of 2nd course shall be welded follow by horizontal joint between 1st course and 2nd course.
ii) Local departure, tolerance cut horizontal and vertical shell seams shall be checked.

5) i) Erection of 4th course. After completion of erection of fourth course, the vertical joint of 3rd course shall be welded follow by horizontal joint between 2nd course and 3rd course.
ii) Joint between shell plate and bottom plate shall be welded.
iii) Local departure, tolerance cut horizontal and vertical shell seams shall be checked.

6) i) Erection of 5th course. After completion of erection of fifth course, the vertical joint of 4th and 5th course shall be welded follow by horizontal joint between 3rd and 4th course, and between 4th course to fifth course.
ii) Local departure, tolerance cut horizontal and vertical shell seams shall be checked.

7) i) Installation of top angle. Dimensional shall be checked prior welding the top angle to the top (last) course.
ii) Local departure, tolerance cut horizontal and vertical shell seams shall be checked.

4.3 ROOF STRUCTURE

i. Roof structure shall be assemble on the ground in section or completed depending on size and weight.

ii. Assembled roof structure shall be erected inside the tank after completion of bottom plate and annular plate.

4.4 ROOF PLATE
Roof plate shall be arranged on the roof structure and welding to be carried out according to welding sequence considering the distortion or warping of plates.

4.5 OUTER RAFTER ERECTION PROCEDURE
Roof of outer rafter shall be assemble on the ground in section or completed depending on size and weight. The sequence of assembly are as follow;

1. Assemble the roof plate on the temporary support.

2. Assemble and welding the center ring and center plate complete with stiffener and rib plate.

3. Fit the ring on the roof plate.

4. Install the rafter and girder on the roof plate.

5. Erect the outer rafter on the temporary support after completion of bottom plate and annular plate.

4.6 WIND PROTECTION OF SHELL PLATE AND ROOF STRUCTURE
Shell plate and roof structures shall be protected by heavy wind during the erection using guy wire rope method. A detailed execution procedure and/ or plan including the detailed dimensions of the device shall be prepared and submitted to CLIENT site for approval, prior to commencement of shell construction work.

4.7 TEST
After completion of the entire tank, test shall be performed in accordance with WH FIELD INSPECTION & TEST PROCEDURE SPECIFICATION.

4.8 CALIBRATION
After completion of the required test, the tank shall be calibrated in accordance to WH FIELD INSPECTION & TEST PROCEDURE SPECIFICATION.

4.9 ATTACHMENT:

1. Fig 1 AND Fig 2.
2. Welding Sequence For Bottom Plate.



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