This guide has been prepared to assist welding personnel with the preparation of welding procedures required as part of their company certification to CSA Standards W47.1, W47.2 and W186.Descripción completa
welding
WELD REPAIRFull description
welding repairFull description
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Repair Method for Above ground Storage TankFull description
Document
Department
Doc No.
Welding Repair Procedure
Engineering
AJM23-35-WRP-DFT-000
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 Page 1 of 4
Document
Department
Doc No.
Welding Repair Procedure
Engineering
AJM23-35-WRP-DFT-000
1. General This Specification covers the welding defects repair detected by the N.D.T applicable procedures.
2. References Repair shall be complied with the requirements of the following codes, standards and Purchaser 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 be repaired 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 the requirements of applicable codes to ensure that the defect has been removed or indication reduced to an acceptable limit. Defect Removal in Repair by Welding (Major Repairs) Unacceptable defects detected visually or by NDT controls shall be removed by mechanical or thermal gouging process, the area to be prepared for repair shall be examined and will comply with the requirements of NDT procedures. Grinding after arc gouging and prior to repair welding shall eliminate a minimum of 1.6 mm of base material. When the distance of subsequence defects will be less than 50 mm, will be repaired together. If the defects to repair are any type of cracks, always will be made a ultrasonic control of the defects in the adjacent area, to ensure that there is not any type of micro cracks, before to start 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 purchaser for approval. The examination of weld repair(s) shall be repeated as required for the original welds including 4 inches on each end of the repair.
Page 2 of 4
Document
Department
Doc No.
Welding Repair Procedure
Engineering
AJM23-35-WRP-DFT-000
Detailed Repair Procedure All essential variables used in the welding repair shall be in accordance with the applicable SMAW 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 be cleaned and deposited additional weld metal. Undercuts less than 0.8 mm shall be cleaned by grinding.
Weld
Exposure
Grinding
Additional Weld
Finish
Internal Defects These defects shall be carried out to the following sequence.
PT or MT
Exposure
Remove
Weld
Repair Weld
NDE
Step 1. Elimination of Defects Page 3 of 4
Document
Department
Doc No.
Welding Repair Procedure
Engineering
AJM23-35-WRP-DFT-000
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 metal surface. Step 2. Examination on the Repair Welding Defects. After defects elimination, the area shall be re- examined by magnetic particle method or liquid penetrant method to ensure that defects have been removed. Qualified NDE personnel and the qualified NDE procedures shall perform the examination. Step 3. Repair W elding. The repair welding shall be performed in accordance with an approved and qualified WPS in this specification. Qualified welders shall perform this welding. After repair welding, the surface shall be blended uniformly into t he surrounding surface. Step 4. Examination on the Repair Welds. The examination required for the original weld or the base material shall be repeated for the weld repair. The examination shall be performed by the qualified NDE personnel and qualified NDE procedures.
4. Documentation All welding repair shall be documented.
