Re: [PSUBS-MAILIST] ASME PVHO

Hugh - looking through my references, I appear to only have a copy of ASME PVHO-1-2002. I will have to order the newer code to see what the changes are.

Can you put that formula in context (i.e. what is it that you are trying to calculate)?

-Sean

On 31/10/2010 8:06 PM, Hugh Fulton wrote:

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.

Regards,

Hugh

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