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MAWP Listed in COMPRESS Table

MAWP Listed in COMPRESS Table

MAWP Listed in COMPRESS Table

(OP)
I am reviewing a vertical vessel that I recently designed with leg supports. The legs are wide flange beams. There is a MAWP listed in the pressure table, for the legs. I have reviewed the leg support calculations, and they do not use the MAWP or design pressure. I am a little confused as to why the vessel MAWP would be listed for the support legs, when they are not a pressure containing part. I am using the latest version of COMPRESS. Thanks for your help

Keens5

RE: MAWP Listed in COMPRESS Table

Keens5, is there an anakysis of the leg attachemnt to the shell? Your answer may lie there.

Regards,

Mike

RE: MAWP Listed in COMPRESS Table

(OP)
SnTMan,

Thanks for the response. I think I see where you are going, but do not see how the MAWP would come into play if we are not dealing with any pressure containing components. The attachment to the shell should be a weld strength calculation. This is what I am thinking. Thanks.....

Keens5

RE: MAWP Listed in COMPRESS Table

What about stresses in the shell due to the loads the leg is putting into the shell (or vice versa)? How are those calculated?

RE: MAWP Listed in COMPRESS Table

(OP)
Tom,

The stresses in the shell are based off the design temperature, correct? I am thinking that the material stress of the shell material, that would be used to check the loads form the lags against, is based off the design temperature and not the MAWP. I went back through all the calcs and did not see anything with pressure. Thanks...

Keens5

RE: MAWP Listed in COMPRESS Table

Keens5, the way these things usually work is, whatever stresses are imposed due to external loadings subtracts from the allowable available to resist pressure. An external load therefore could produce a lower MAWP in a shell section than if the load were absent.

Regards,

Mike

RE: MAWP Listed in COMPRESS Table

I see this post another way, depending on the diameter of the shell and the MAWP of the pressure vessel, thicker wall thickness for shell and heads may make these PV's lighter or heavier and thereby thinner or thicker legs to support vessel would be required.

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