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Requirement Of Full Bore Isolation Valves At Psv Inlet And Outlet As W

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#1 SawsanAli311


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Posted 08 December 2019 - 11:35 PM

Dear All,

I would like to seek your views on the following:

- Requirement for full bore isolation valves at PSV inlet.. ASME SEC VIII recommends them to be full bore by stating'' full area stop valves'' . While API 520 Part II removed this requirement in its latest revision.
- Requirement for FB isolation valves downstream the PSV
- Requirement for full bore isolation valves downstream the restriction orifice which is on emergency blowdown valves.



#2 breizh


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Posted 09 December 2019 - 08:05 AM

Hi ,



Consider the link above to support your work , please read it carefully ( 2 PSV, isolation valves , car seal ,100% flow path, etc ) 



Edited by breizh, 10 December 2019 - 02:32 AM.

#3 Chemitofreak


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Posted 13 December 2019 - 01:32 AM

My two cents:


The reason for using Full Bore valve for isolation of PSV


1) Low pressure drop


2) Allows no liquid pocket formation in the piping 

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