Basis for vaccum pressure design
Basis for vaccum pressure design
(OP)
Dear Experts,
Can you suggest what should be the basis for design of a pressure vessel for vacuum pressure.
Regards,
Pranjal
Can you suggest what should be the basis for design of a pressure vessel for vacuum pressure.
Regards,
Pranjal





RE: Basis for vaccum pressure design
Regards,
Mike
RE: Basis for vaccum pressure design
By "basis" I assume that you mean the reasons for a certain design requirement.
Regarding vacuum design of pressure vessels, my experience has been that process chemical plants commonly require the "FV" (full vacuum rating) on most of the storage vessels that they purchase. This is because of the increased use of steam cleaning of vessels and piping.
Another reason to specify FV as a design condition is the fact that many tanks and vessels are repurposed in the facility as time goes by...
For smaller diameter vessels ( up to ~ 60 inches) this adds little cost to the vessel.
It is generally not considered wise to design a pressure vessel for a vacuum any less than a FV condition
MJCronin
Sr. Process Engineer
Venture Engineering & Construction
www.VentureEngr.com
RE: Basis for vaccum pressure design
Can you please give a brief on how vacuum is created during steam out of a vessel.
Regards
RE: Basis for vaccum pressure design
Matt
RE: Basis for vaccum pressure design
RE: Basis for vaccum pressure design
I've seen a 5 mm thick vessel implode while being pumped out because all the other connections were locked out.
Tanks usually are usually stated to be designed for Full vacuum, since their internal design pressure calculations for atmospheric pressure would not provide sufficient thickness for vacuum conditions.
RE: Basis for vaccum pressure design
One more conidtion when the Vessel experiences FV or External load:-
1.If Vessel is located in pit, soil load in closed pit on the vessel.
2.Also for open pit due to rain there is water in open pit.
Vessel may experience external pressure incase vessel is at atm pressure from inside during operation.
cheers
AK
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