Opinions Wanted: Fitting Under Sec VIII, Div. 1
Opinions Wanted: Fitting Under Sec VIII, Div. 1
(OP)
I had a (nearly wasn't) hypothetical situation recently concerning use of reducing tee as a shell eleement. The proposal was to use a 24" X 16" reducing tee as part of a 24" shell w/ 16" nozzle to avoid fabricating the large opening.
Question is: Is the tee inherently adequate without considering the opening, under UG-44, or is it treated as a flued opening under UG-38 and UG-37?
Any interpretations, etc to support your view?
TIA,
Mike
Question is: Is the tee inherently adequate without considering the opening, under UG-44, or is it treated as a flued opening under UG-38 and UG-37?
Any interpretations, etc to support your view?
TIA,
Mike





RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
What then? Is it inherently reinforced? Is it a flued opening?
Regards,
Mike
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
In this type of grey area of the code, my expectation is to go the more conservative route. This means I would expect this would fall under a flued opening requiring supporting calculations.
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
All well and good to prove it per UG-37, however some practical complications may exist related to size of opening (variable), limits of reinforcement, particularily along opening axis, nozzle thickness required, excess available, and so forth.
I suppose it might be reasonable to just treat it as a fabricated opening, as stress concetration would obviously be much lower in the tee.
As you said, grey area, but this must have come up before, I am hoping for some relevant "history" either way:)
Regards,
Mike
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
Check UG-4 through UG-9
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
Regards,
Mike
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
Forget section II, that's irrelevant. good luck.- GenBlr
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
As per UG 5(C) pressure parts, such as standard pipe fittings, welding caps, and flanges that are seamless or fabricated by one of the welding processes recognized by this division do not require inspection.
As per UG-44 thickness for the fittings conforming to B16.9 shall be calculated as a seamless pipe with the manufacturers tolerance applied.
The pipe fittings including Tees are generally hot formed and are exempt from heat treatment requirement due to fiber elongation (see SA-234 in Section II, Part A and UCS-79).
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
GenB, Sec II irrelevent? Don't think so.
Regards,
Mike
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
RE: Opinions Wanted: Fitting Under Sec VIII, Div. 1
Only UG-44 is applicable. UG-36 thru 38 do not apply
Design the fitting considering 24" pipe. Apply 12.5% negative tolerance while calculations
Make sure that the Tee is not modified (don't reduce length or height)otherwise the Tee shall be considered as non standard.