clean out neck (cut and weld again)

[Younis Najim]

referenced to thread: thread1452-461337
Hello Everyone,
After installing the clean out and due to wrong welding process, the contractor had to cut and reweld the clean out neck again. Is this permissible in API 650. I would appreciate if someone can refer us to a clause in API that cover this type of issues.
Thank you

 

[IFRs]

The problem you are going to have is per API 650 5.7.4.1 and 5.7.7 flush cleanouts are supposed to be assembled into a shell insert plate, the assembly then Post Weld Heat Treated, with NDE after PWHT. I think API 650 clarified in a technical inquiry that field PWHT is not allowd unless the whole tank is heat treated at the same time. The only possibility I can think of would be to claim this is not a new tank and use controlled deposition welding in lieu of PWHT, see API 653 Section 11.3.

There was an agenda item that would allow weld repair of PWHT assemblies under cretain circumstances with limits on the length and depth of the repair and certain NDE. I don't think that has made it into the standard.

 

[Dhurjati Sen]

If this is a new tank, get the clean out door assembly removed, perform the necessary welding, then heat treat it. Only then you can weld it back to the tank.

DHURJATI SEN
Kolkata, India