Tube to Tubesheet Welds
Tube to Tubesheet Welds
(OP)
Hi,
I have questions about the Tube To Tubesheet welds. BPVC Sec. VIII Div.1 UHX not specifies the qualification method so i may use either of groove weld, fillet weld PQR's or Mock-up.(Sec. IX QW-193)
My first question is, which one will you prefer for the attached weld detail? As far as i know manufacturer not have single layer fillet or groove weld PQR's(GTAW)
My second question is, if we use mock-up(QW-193)option, after welding 10 tubes and passing all NDE(VT+PT) how many macro sections do we need to evalute? All 10 tube welds with 4 surfces(total 40 macro!) or only one weld on 4 surface.
Thanks in advance,
I have questions about the Tube To Tubesheet welds. BPVC Sec. VIII Div.1 UHX not specifies the qualification method so i may use either of groove weld, fillet weld PQR's or Mock-up.(Sec. IX QW-193)
My first question is, which one will you prefer for the attached weld detail? As far as i know manufacturer not have single layer fillet or groove weld PQR's(GTAW)
My second question is, if we use mock-up(QW-193)option, after welding 10 tubes and passing all NDE(VT+PT) how many macro sections do we need to evalute? All 10 tube welds with 4 surfces(total 40 macro!) or only one weld on 4 surface.
Thanks in advance,





RE: Tube to Tubesheet Welds
RE: Tube to Tubesheet Welds
When we cut the pipe in to two halves we get 4 weld surfaces, but 2 faces were the same in practical as they mirror images of others. When i say 40 macros i was thinking like cutting each pipe in to quarters to get different sections of the weld. Is my thinking wrong? I hope i'm wrong as this will save me from many specimen prep.
RE: Tube to Tubesheet Welds
The code requires examination of four exposed surfaces from sectioning regardless if they are mirror images - you can have buried flaws and this is what the examination is supposed to reveal among verifying the throat dimension, etc. How you choose to prepare the cut surfaces is up to you just make sure the surfaces are smooth enough for proper interpretation.
RE: Tube to Tubesheet Welds
RE: Tube to Tubesheet Welds