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4

Maximum Allowable Accumulated Pressure

psv

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#1 mahmooddalvi09

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Posted 30 January 2025 - 07:38 AM

Hii all,

 

This is just to clear my query on max. allowable accumulated pressure in pressure vessels as mentioned in ASME SEC VIII.

 

Why do we always take credit for max allowable overpressure or max allowable accumulation, can't be accumulation kept below 110%, 116% or 121%?

 

I mean less the accumulation, less the system overpressure and hence less we avoid reaching over MAWP.

 

Or is it just considering max accumulation results in smaller PSVs and hence less cost to manufacture.

 

Might be foolish query but i had to.

 

Many thanks!

 



#2 latexman

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Posted 30 January 2025 - 07:53 AM

It’s just the rules (ASME). You can go lower. Maximum overpressure is 10% (process upset) or 21% (fire).

#3 Pilesar

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Posted 30 January 2025 - 07:54 AM

You can set the PSV trigger pressure as far below the MAWP as you like! Consider the cost of the vessel in your economic analysis. Vessels designed for higher pressure than needed will be more expensive than needed.



#4 mahmooddalvi09

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Posted 31 January 2025 - 11:23 PM

Thanks for reply Latexman and Pilesar!

#5 breizh

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Posted 01 February 2025 - 12:10 AM

Hi,

Agree with answers above.

Consider this handbook to support your work

Breizh

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#6 mahmooddalvi09

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Posted 05 February 2025 - 02:22 AM

Thanks breizh, that's some good handbook to refer.






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