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.