pressure vessel design pressure

[indimech]

All,
I want to know if design pressure of any vessel is 15 psig whether it comes under pressure vessel category and its stamping is needed?

Thanks in advance.

 

[micalbrch]

What standard is necessary for your vessel, ASME, PED, other?

 

[indimech]

The vessel, infact it is tank at atmospheric pressure, will be installed in Ohio, US. So ASME standard will be followed.
My question is related to the fact that if the design pressure is specified as 15 psig whether it will come under pressure vessel as per ASME boiler and pressure vessel code and consequently any stamping will be required or it can be manufactured as per code but do not need stamping.
Capacity of tank will be 24000 gal.

 

[MJCronin]

indi....

What many companies decide to do in this type of circumstance is to specify a MAWP of ~14.5 psig.

Then they have the tank/vessel designed, fabricated and inspected/tested to the requirements of ASME VIII but no code stamp is required.

Thus, they get a quality product, comply with the letter of the law and also escape state and national registration fees and requirements.

Or so I am told....

-MJC

 

[indimech]

Thanks MJC...

Is the criteria of any vessel to be stamped or not is based on Design pressure or maximum allowable working pressure?

For instance my design pressure is 14.9 psig and MAWP is 15.5 psig in that case whether the vessel needs to be code stamped?

 

[jte]

How 'bout UG-99(b) footnote 34?

Also, be aware that individual jurisdictions may have criteria which diverges from that listed in the scope of VIII Div. 1.

infact it is tank at atmospheric pressure

So... why not use API 650 or similar if not in an API type environment / service?

jt

 

[vpl]

indimech,

This might be a case where you should be talking to your State board. It would be a shame to base your design off of what someone told you here only to find out that the State wouldn't accept it.

Patricia Lougheed

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[GenB]

you design at desired pressure, if below 15psi
and it's used it at <15psi no ASME stamp needed.
your Jurisd. will want a SV for safety.