Joint Efficiencies for Nozzles
Joint Efficiencies for Nozzles
(OP)
UW-11(a)(2) states that radiography is not required for Cat B and C butt welds in communicating chambers that do not exceed 10 NPS. If I have a vessel with Full Per Code RT and nozzles which are 6"-RFWN nozzles, can I take credit for a JE = 1 in my calculations for these nozzles even though x-ray will not be performed? Or must I use .85%
Thanks!
Thanks!





RE: Joint Efficiencies for Nozzles
Regards,
Mike
RE: Joint Efficiencies for Nozzles
RE: Joint Efficiencies for Nozzles
RE: Joint Efficiencies for Nozzles
As a result you can have a fully radiographed head and shell seam but no RT performed on the nozzle to flange welds that are on that very same vessel.
So do these nozzles that are < 10" NPS have a JE = 1 in the code calculations?
dskjockey1
RE: Joint Efficiencies for Nozzles
Regards,
Mike
RE: Joint Efficiencies for Nozzles
RE: Joint Efficiencies for Nozzles
RE: Joint Efficiencies for Nozzles
RE: Joint Efficiencies for Nozzles
UW-12(d) does not apply to seamless nozzle pipes connected to butt welded flanges. Rather it applies to vessel seamless sections and heads. Vessel seamless sections means shell courses made from seamless pipe, seamless cones etc.
UW-12(a) says E=1 if UW-11(a) is satisfied in addition to especially UW-11(a)(5). Again note that UW-11(a)(5) does not apply to seamless nozzles pipes connected to butt welded flanges.
This is what how I read UW-11 and UW-12.
Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN