[MW:25225] Re: Reg. post heating for low alloy steels

Dear Prasad,

You can refer to the series of API 934 A or API 934 B or API 934 C., E, & G.

& refer to the clause on "Intermediate Stress Relief/ Dehydrogenation Heat Treatment".

These are standards for pressure vessels.

Regards

MK

On Sunday, 7 August 2016 10:40:33 UTC+8, Prasu wrote:

Dear experts,
We are going to start pqr for low alloy steels i.e. A335 Gr P11, P22, P5, P91 etc, it suppose to be post weld heat treated immediately  after welding. As per literature if pwht is not possible immediately  after welding, intermediate PWHT recommende .i.e pos heating.
Now the question is is there any code reference for the same? What is the heating time n temp???
The codes we r following  here are shell dep's n asme b 31.3
Project: refinery

Awaiting for your reply

Thanks n regards
Prasad
0096594122634

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