Mud Drum Internal Pipe

[pmover]

design P = 200-psi
do repairs or complete replacement of a 1-inch internal boiler mud drum pipe (used for keeping boiler warm) require to have R-stamp? method of connection is unknown as OEM dwgs do not exist; however, the connection joints may be threaded with seal weld.
I'm thinking no different than replacing boiler tubes in steam generator section; just do not grind/remove pressure boundary metal.
I'm going through section 1 and not able to locate much on internal piping; perhaps I'm overlooking matters.

thanks.

 

[metengr]

If it is a boiler pressure retaining item, the NBIC R-Stamp would apply for welding.

 

[KoachCSR]

I agree - that piping should be ASME Section I code piping.

 

[pmover]

thank you metengr
follow-up question/clarification, if the original connection is threaded and replaced with threaded connection, then no NBIC R-stamp? however, if cutting the seal weld and re-welding the seal weld, then NBIC R-stamp?
regardless of attachment method, the replacement pipe + fitting materials need to comply w/ Sect 1 and internal + external pressure calcs need to be done on this pipe.

 

[pmover]

whoops, thank you KoachCSR

 

[metengr]

pmover;

follow-up question/clarification, if the original connection is threaded and replaced with threaded connection, then no NBIC R-stamp?

Correct

however, if cutting the seal weld and re-welding the seal weld, then NBIC R-stamp? regardless of attachment method, the replacement pipe + fitting materials need to comply w/ Sect 1 and internal + external pressure calcs need to be done on this pipe.

Yes and yes.