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Hi Jon, I think that we should have the
Q.A. part tied up for P-subs as well so that the home builders appreciate the
requirement for roundness. I am afraid I am lacking in the understanding and
math behind getting the answers and I think that Cliff, Sean, and you would
come to some agreement as to a formula. I cant believe that it is a
misprint in ASME. I am missing something somewhere but I don’t know what.
Chs, Hugh From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace
Hi Sean, I am having problems with doing Q.A. on my
shell for out of roundness. This is an area which is fairly important to
measure. I have applied the 1% rule as a general
tolerance but trying to comply and understand the PVHO caclcs. ASME PVHO-1-2007 has a section:- 1-7.13.3 (e) (2) Formula for c c= 2.28(R/t)^0.54 cannot get under
the required 2.8 with any normal measurements of a vessel . Do you have any experience with this.
My diameter is 48” and the shell thickness
5/16” L is 15.75” Have you done any calcs on this area.
Do/t for my purpose is 162 which falls
within normal dimensions and under UG80.1 gives sensible answers.
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