Ovality of Nozzles

[bmoorthy]

hello

Where as ASME provides tolerances for ovality of shells subjected to pressures, is there tolerances on ovality for fabricated nozzle pipes?

Regards

bmoorthy

 

[deanc]

See the requirments in SecII and SecVIII UG-45

 

[bmoorthy]

UG 45 does not refer to Ovality tolerances for Nozzles.

Sec II tolerances cannot be applied, when the pipe is used as Nozzle in a vessel. Just as we cannot apply the straightness tolerances of sec II in components after it is used in Vessel.

 

[deanc]

Think you need more to do. LOL I get to spend time here while waiting for others.

See U-2(g). Now since you seem to enjoy finding things,look at UCI-78(c) and UW-28.

 

[twjag]

BMOORTY,

Per UG-80, permissible out-of-roundness for cylindrical shells is 1% of nomimal diameter at cross section.
Pipe specifications also generally limit out-of-roundness to 1%, though some specs for fusion welded pipes allow 1.5%.
Lacking other direction, I have used the 1% criteria of UG-80.
You may also investigate whether there is a Code Interpretation on this subject