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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