[MW:32813] Re: PWHT soaking time for impact testing applicable vessel

yes, acceptable, there is ASME interpretation.

I try to attach it but was not able to attach it.

On Wednesday, December 8, 2021 at 9:20:51 AM UTC+3 ibratech wrote:

Gentle men,

A pressure vessel required PWHT, and Impact test. The vessel thickness is 46 mm. The PWHT of this vessel required as per code is 108.6 minute.

The contractor submitted a PQR which is performed 60 minutes (1hr)  and  720 minute (12hrs) PWHT and and all mechanical test done in both holding time.

As ASME sec IX, clause 407.2 

"

QW-407.2 A change in the postweld heat treatment
(see QW-407.1) temperature and time range
The procedure qualification test shall be subjected to
PWHT essentially equivalent to that encountered in the
fabrication of production welds, including at least 80%
of the aggregate times at temperature(s). "

As per the above clause the PQR is acceptable?. It does not meant PQR shall be essentially equivalent within 80% of actual production PWHT?. Since the manufacture done 60 minutes and 720 minutes, and the production PWHT comes in between holding time (108.6) the PQR will be acceptable?

 

Thanks & Regards
Muhammed Ibrahim PK

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