--Dear All;
We have a hot tap on LPG line (Sour service) which require PWHT.
The run Pipe is 4", the branch is also 4", split tee will be used.
As per shell DEP-31.38.60.10 – for Hot tapping, clearly mention:
Hot-tap welding should not normally be performed on materials which require post-weld
heat treatment. However, if stress relieving or post-weld heat treatment is required, a
specialist shall be consulted to assess whether it is feasible to make the specific
hot-tapping operation with post-weld heat treatment.
Note: Stress-relieving may be required if a material is susceptible to stress corrosion cracking and post-weld
heat treatment may be specified by the design code if the wall thickness is greater than a certain limit.
& since we have no other options, we have to do the hot tap on the same, kindly advice WPS & PWHT procedures
Thank all in advance..
Regards
Majdi Elyyan
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