Dear Prasad,
As per the SHELL DEP 31.22.11.32 Appendix C, please find below the post heating requirement
If, for fabrication reasons, the final required heat treatment is not performed directly
after welding, a post-weld soaking heat treatment shall be performed at a temperature
of 350 °C for 3 hours, without cooling down below the preheat temperature, prior to
cooling down to ambient temperature.
The DEP's 31.22.11.32,31.22.20.31 ,31.22.10.32 also applicable for equipment and piping.
Please read the DEPs carefully.
best regards,
veloumany
From: Prasu Cutie <pracuty@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, August 7, 2016 5:33 AM
Subject: [MW:25208] Reg. post heating for low alloy steels
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
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
-- Prasad
0096594122634
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAKgcArQMULX%3DQgcoXb8CgGM%3DmHiLQZG50iXgWuCR146W_HjO_g%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
No comments:
Post a Comment