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 Document Department Doc No.

Welding RepairProcedure

Engineering AJM23-35-WRP-DFT-000

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WELDING REPAIR PROCEDURE

FOR

DIESEL FUEL TANK

PIPE LINE PROJECT (CP-07)

CLIENT : PT. NAVITAS INDONESIA

END USER : PT. PERUSAHAAN GAS NEGARA (Persero) Tbk

PROJECT : LABUHAN MARINGGAI – TANJUNG KARANG

PIPE LINE PROJECT (CP-07)

PROJECT NO. : AJM 13.04.048

YEAR : 2014

0 19-02-2014 Issue For Review Gusti Yanto Arya

Rev Date of Issue Status Prepared Checked Approved

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Welding RepairProcedure

Engineering AJM23-35-WRP-DFT-000

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1. General

This Specification covers the welding defects repair detected by the N.D.T applicableprocedures.

2. References

Repair shall be complied with the requirements of the following codes, standards andPurchaser requirements.

 API 650, Edition 2007,

 ASME section V

 ASME section IX

3. Application

Elimination of Surface Defects without Welding (Minor Defects)

Weld metal surface defects may be removed by grinding or machining and shall not berepaired by welding provided the requirements as follow:

The remaining thickness of section is not reduced below that required.

The depression after defect elimination is blended uniformly into surrounding surface.

The area examined after blending by magnetic particle or liquid penetrant method meet therequirements of applicable codes to ensure that the defect has been removed or indicationreduced to an acceptable limit.

Defect Removal in Repair by Welding (Major Repairs)

Unacceptable defects detected visually or by NDT controls shall be removed by mechanicalor thermal gouging process, the area to be prepared for repair shall be examined and willcomply with the requirements of NDT procedures.

Grinding after arc gouging and prior to repair welding shall eliminate a minimum of 1.6 mm ofbase material.

When the distance of subsequence defects will be less than 50 mm, will be repairedtogether.

If the defects to repair are any type of cracks, always will be made a ultrasonic control of thedefects in the adjacent area, to ensure that there is not any type of micro cracks, before tostart to repair.

 After the repair done, the surface shall be blended uniformly into the surrounding surface.

The weld repair shall be in accordance with applicable code and submitted to the purchaserfor approval.

The examination of weld repair(s) shall be repeated as required for the original weldsincluding 4 inches on each end of the repair.

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Welding RepairProcedure

Engineering AJM23-35-WRP-DFT-000

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Detailed Repair Procedure

 All essential variables used in the welding repair shall be in accordance with the applicableSMAW or GTAW welding procedure, latest approved edition.

Overlap or Excessive Convexity.

These defects shall be reduced by removal of excess weld metal by grinding.

Grinding

Excessive concavity of welds or craters, under cutting (0.8 mm over). These defects shall becleaned and deposited additional weld metal. Undercuts less than 0.8 mm shall be cleanedby grinding.

Weld Grinding

Exposure Additional Weld Finish

Internal Defects

These defects shall be carried out to the following sequence.

PT or MT Weld

Exposure Remove Repair Weld NDE

Step 1. Elimination of Defects

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Welding RepairProcedure

Engineering AJM23-35-WRP-DFT-000

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The defects shall be removed by chipping, grinding, machining or arc-air gouging

when arc-air gouging is used, the gouged surface shall be ground to clean metalsurface.

Step 2. Examination on the Repair Welding Defects. After defects elimination, the area shall be re- examined by magnetic particle methodor liquid penetrant method to ensure that defects have been removed. Qualified NDEpersonnel and the qualified NDE procedures shall perform the examination.

Step 3. Repair Welding.

The repair welding shall be performed in accordance with an approved and qualifiedWPS in this specification. Qualified welders shall perform this welding. After repairwelding, the surface shall be blended uniformly into the surrounding surface.

Step 4. Examination on the Repair Welds.The examination required for the original weld or the base material shall be repeatedfor the weld repair. The examination shall be performed by the qualified NDEpersonnel and qualified NDE procedures.

4. Documentation

 All welding repair shall be documented.