09A Slip-On Fillets & Setback UW-21
09A Slip-On Fillets & Setback UW-21
(OP)
Ch-ch-ch-changes.
Would you interpret the dimensions given in UW-21 as minimums with the maximums shown in appendix 2 for a loose-type arrangement? This appears to have been a hurried change when compared to the completeness in the '08 Addenda...and this interpretation seems consistent between the two addendas.
Would you interpret the dimensions given in UW-21 as minimums with the maximums shown in appendix 2 for a loose-type arrangement? This appears to have been a hurried change when compared to the completeness in the '08 Addenda...and this interpretation seems consistent between the two addendas.
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RE: 09A Slip-On Fillets & Setback UW-21
they are not addressing the standard 1/8" between toe of weld and the corner of raised face. but appendix 2 says max is 1/4" + wall of pipe.
we standardly use pipe wall + 1/8 for set back with a pipe wall + 1/4" max set back
Now that being said, we never weld a slip on flange in pressure situation, just internal non-pressure.
RE: 09A Slip-On Fillets & Setback UW-21
Agree with BigTank, this looks a little hasty.
Regards,
Mike
RE: 09A Slip-On Fillets & Setback UW-21
RE: 09A Slip-On Fillets & Setback UW-21
Where tn is the nozzle or pipe wall thickness
Also worth noting another inconsistency in B31.3-2004 T overscore is used in the rule for xmin.
At any rate something for ASME to fix/clarify in the next edition or addenda of section VIII.
RE: 09A Slip-On Fillets & Setback UW-21
Yes, this is an error which did not get caught prior to final printing.
The new weld dimension requirements in UW-21 were extracted from B31.1 and should mirror them in the upcoming Errata.
In the meantime, BradLancour is correct:
1.4tmin should read 1.4tn.
Xmin = 1.4tn or thickness of hub, whichever is smaller.
tn= nominal pipe wall thickness.
Regards.