Dear Experts,
We have 2" sch 160 & 4" sch 80 C/S Piping welding ,whether we need to conduct PWHT for these lines or no need , because as per standard CAUSTIC service lines need PWHT. but in our package the service fluid is SPENT CAUSTIC and I want to know what is the required percentage of NDT for these service lines,
Please send suggestion & if any specific documents..
Thank you,
MPK
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