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[PSUBS-MAILIST] ASME PVHO



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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