HI ALL,

DO A STORAGE TANK DESIGNED BY ROARKS FORMULAE NEED TO BE STAMPED? IF SO

WHY?

Hi Shabeer,

Stamped with what?

Hi Stan,

I mean to say whether it will require Code stamp which is been requested

in ASME? Its just a chemical storage tank of 8 mm thickness and the fluid

is maintined at 65 dec C.

Shabeer,

If you have designed a tank using only Roark then you would not put the ASME code stamp on it. I would ask what code (if any) should be used for the tank design, fabrication & testing. This will depend on where (country/region) the tank will be used and whether there are any additional requirements to be satisfied due to any risks associated with the chemical being stored. If the tank is only under static head with no applied pressure then I would try and find a code or standard that covered this application. I would not use Roark on its own. The formulae contained within Roark do not include safety factors and do not address materials, fabrication, etc.

Stan,

I too thought the same as u, but my client asked me whether we need to stamp the tank. They want reference for my answer.

I read in ASME sec VIII Div 1, that when the temperature of the fluid inside crosses the boiling point then only it will come under criteria for stamping. So the tank designing by me doesnt need to be stamped.

Any way thanks for ur effort.

shabeer,
Storage tanks are designed to API standard 650, 620 or similar standards like AWWA for water storage. These tanks are not stamped or marked otherwise, the fabricator only affixes a nameplate. ASME VIII is the Boiler and Pressure Vessel Code, which regulates the design and fabrication of the pressure vessels (as the name suggests). The certification from the fabricator that the vessel was designed and fabricated in accordance with ASME VIII code, is in the form of a Code Stamp placed on the completed vessel, with the approval of a Authorised Inspector, named U stamp, U2 stamp or similar as regulated by the ASME Code.
Summary, tanks have nameplates only, vessels have nameplate and Code Stamp as required by the Code. Consequently, your storage tank does not come under ASME VIII jurisdiction and as such cannot be stamped (assuming that your tank is vented to the atmosphere).
Also, it seems that you are re-inventing the wheel, by designing a storage tank per Roark's formulas. Why dont you use API standards for your tank design? Is you Client happy to accept your Roark based design?
regards,
gr2vessels

gr2vessels,

thanks for ur effort.

i have suggested not to stamp it to my client. My client do not restrict me for designing a storage tank as per Roarks...........

Any way thanks for all.