[MW:17204] WPS with PWHT below the lower transformation temperature

Dear all,

WPS details as per ASME IX  Design Code :B31.3

1) GTAW + SMAW (3mm+ 24mm)

2) Material API 5L x52 Thk : 26.97

3) PWHT 600 +/-20  Time : 1Hr  20min

4) No impact.

 

Can I Re Write WPS with Temperature  670+/-20 as per As per QW-407.1 a (2) ? ( up to below Lower transformation no need re qualification )

Need expert Opinion.

( QW-407 Postweld Heat Treatment

QW-407.1 A separate procedure qualification is

required for each of the following:

(a) For P-Numbers 1 through 6 and 9 through 15F materials,

the following postweld heat treatment conditions

apply:

(1) no PWHT

(2) PWHT below the lower transformation temperature )

Regards,

mohd.

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