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[MW:16604] weld repair as per API 6A - PSL3

By Materials & Welding

Dear experts,

Please guide me on this issue.

Client requirement: weld repair required to comply with API 6A – PSL3, which states qualification of weld procedure according to ASME SEC IX 2004.

Case:

I have a qualified WPS per ASME SEC IX for CA6NM material with CVN tested. PWHT time run     in the PQR is double tempered to 14 hrs and 16 hrs respectively.

We repaired the casing, post weld heat treated and NDE checked.

 This revealed repair in the same area, and re-repaired, again post weld heat treated to the same time.

We have submitted weld repair details and WPS. Now client made a comment that the PQR does not support the additional PWHT time that the production weld has undergone.

His concern is that what will happen to the parent metal properties because of this extended time of PWHT.

I need to get clarification for the following and share your experiences of similar case.

1. Is there will be reduction in mechanical properties of parent metal / weld metal to the level below specification, after extended time of PWHT (temperature of PWHT is below transformation range)?

2. Which code or industry specification requires the validation of parent metal properties after such PWHT condition (extended time or multiple cycles)?


MANIVANNAN.P

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