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U stamp required for this vessel?

U stamp required for this vessel?

U stamp required for this vessel?

(OP)
Hi All,

I would like to confirm something in U stamp requirement to a small pressure vessel.

The design pressure is 125 psig
The shell will be 12 inches pipe sch40
Ends will be cap in sch 40.
Length of the shell will be 4 feet.

Per my understanding to U1(c)(2)(i) of ASME VIII-1, it is within the scope of VIII-1, the stampe is required.

Any comments will be appreciated.

RE: U stamp required for this vessel?

Your assumption for a U-stamp is correct for this vessel.

RE: U stamp required for this vessel?

wangzh-

Yes, your interpretation is correct. If you are getting the argument that it is built of piping components and thus is a pipe, take a look at Interpretation VIII-1-04-46 in Volume 56, 2006.

jt

RE: U stamp required for this vessel?

(OP)
Thanks all

RE: U stamp required for this vessel?

Note that falling within the code limits doesn't always mean it must be a code vessel.  Some jurisdictions don't require vessels to be stamped, and if you're outside the US, it may fall under some other requirement.  Also, I believe pressurized water tanks are exempt even though they otherwise fall within the requirements.

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