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[MW:10732] Standard Requirement for Pressure Containing

By Materials & Welding

Friends,

 

1-What standard requirement for hole repair weld to remove defect.Is it can reach to root or any % of thickness.

2-Any standard/spec can covered for defect appear at root area for high pressure part.

3-From API 6A àclause 6.4.2 for PSL1, 2 & 3:

 

The requirements for PSL 1 shall apply for PSL 2 and PSL 3 with the addition of the following requirements for

bolt hole, tapped hole, and machined blind hole repair.

The following apply.

a) The welder/welding operator shall perform an additional repair-welding performance qualification test using a

mock-up hole.

b) The repair-welding-qualification test hole shall be qualified by radiography in accordance with 7.4.2.2.14 or

shall be cross-sectioned through the centreline of the hole in two places 90° apart and macro-etched to

confirm complete fusion. One surface of each of the four matching segments shall be macro-etched. This

evaluation shall include the total depth of the hole.

c) The repair-weld qualification shall be restricted by the following essential variables for performance controls.

⎯ The hole diameter used for the performance-qualification test is the minimum diameter qualified. Any

hole with a diameter greater than the diameter used for the test shall be considered qualified.

⎯ The depth-to-diameter ratio of the test hole shall qualify all repairs to holes with a same or smaller depthto-

diameter ratio.

⎯ The performance-qualification test hole shall have straight parallel walls. If any taper, counter-bore or

other aid is used to enhance the hole configuration of the performance test, that configuration shall be

considered an essential variable.

 

API 6A-Appendix E
 
:

5-How about other standard related.

 

 

 

6-Here who familiar with material 4130.What common problem with documentation&during&after weld? Consumable match when 4130 join to api 5L pipe.  

 

Thanks,

 

Regards,

Duplex

 

 

 

 

 

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