undertolerance
undertolerance
(OP)
Hello,
Someone knows if I have to apply a undertolerance of 12,5% to calculate the minimum wall of a shell of sa-516 Gr.60? (is a steam drum, D=1300mm, nominal thickness= 30mm, 48.5kg/cm2, 270ºC, ASME I code) I suppose there exist a undertolerance to convert to the after forming value (PG-16.4).
The same question for a elliptical head.
Thanks.
Someone knows if I have to apply a undertolerance of 12,5% to calculate the minimum wall of a shell of sa-516 Gr.60? (is a steam drum, D=1300mm, nominal thickness= 30mm, 48.5kg/cm2, 270ºC, ASME I code) I suppose there exist a undertolerance to convert to the after forming value (PG-16.4).
The same question for a elliptical head.
Thanks.





RE: undertolerance
HEADS ARE PURCHASED AS MINIMUM THICKNESS AND HEAD MANUFACTURER APPLIES HIS THIN OUT REQUIREMENTS
SHELLS ARE NORMALLY OK UNLESS HOT FORMED THEN YOU ADD A SMALL AMOUNT TO THICKNESS FOR THINNING DURING FORMING.
RE: undertolerance
RE: undertolerance
Sorry but 12.5% is tolerance on wallthickness for pipe and not on diameter.
RE: undertolerance
I KNOW EXACTLY WHAT IT IS
pipe is not round and the id is not always correctly centered on o.d
the ovality and off center causes wall to be thin
yes sir
it is for wall thickness