- Remove internals,
- weld an internal ring (same material as the shell) to the vessel (later you will weld internals to this ring),
- carry out PWHT on vessel without internals and then
- weld the internals to that internal ring...
This way, after PWHT, there has been no weld on shell (un-heat treated welds are on internal rings).
Good luck
Ramin Kondori 
QC/Welding Engineer
IWE AT 0070
On Wed, Aug 3, 2011 at 2:59 PM, Vijay <k.vijayaraj@gmail.com> wrote:
Dear Experts,
We are in big trouble. We need your inputs for our problem which we
are facing now.
We are fabrication a pressure vessel with ASME U stamp. In that vessel
some internal of SS316 materials are to be welded. The size is 24".
My question: Can we do PWHT of Loading Temp @425 Deg. C and Soaking
Temp @610-630 Deg.C of 51 mins Soaking time.
Is there any code requirements for PWHT for SS internals???
We got approval from Client design team PWHT with internals and we
proceeded the welding also based on their confirmation.
Now, our QC is not accepted this method. We are in deep trouble.
Kindly clarify.
Thanks in advance.
Regards,
Vijay
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