[MW:21753] Soaking time as qualified.

Dear Sir

Please you help me to clarify.

Concerning we had prepared PQR is A333 Gr.6 (MDMT is -46 c) thickness 25 mm normally should be soaking time as 1 hr. But i want to it cover range 2t (50 mm thk.) so i had soaking time is 2 hrs.

Question If we welding pipe thickness 25 mm. Can be PWHT as 1 hr or not ?      Or should be soaking time is in accordance with PQR as qualified ? 

 Ref. ASME IX

Adisak

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