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At what point does the code change from sect. VIII to B31.3

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robgreg1978

Petroleum
Joined
Sep 19, 2012
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US
My question is, I have a ASME coded vessel with a 1" threaded coupling welded into the vessel for a drain. The client wants to unthread the existing nipple and thread a new 1" sch. 160 nipple and seal weld the threads. I have one guy telling me this is asme section 8 code work and one guy telling me it will be B31.3. What is the determing factor on this. I was taught on a vessel it was a code weld to the first bolted connection. This I'm really not sure on. thanks
 
Review VIII-1 U-1(e)(1) and B31.3 300.1.1(c).
 
U-1(e)(1)(a) refers to UW-13(h), and FIG UW-13.4. So, the weld between Div 1 and B31.3 is belonged to Div 1 or B31.3 ?
 
From the top of my head, based on 300.1.1(c) that would fall under B31.3.
 
robgreg1978,
You are right, the ASME VIII code jurisdiction ends at the coupling weld to the shell/head.
Cheers,
gr2vessels
 
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