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.
Thanks
Regards,
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Requirement Of Full Bore Isolation Valves At Psv Inlet And Outlet As W
Started by SawsanAli311, Dec 08 2019 11:35 PM
2 replies to this topic
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#1
Posted 08 December 2019 - 11:35 PM
#2
Posted 09 December 2019 - 08:05 AM
Hi ,
http://webwormcpt.bl...-spare-psv.html
Consider the link above to support your work , please read it carefully ( 2 PSV, isolation valves , car seal ,100% flow path, etc )
Breizh
Edited by breizh, 10 December 2019 - 02:32 AM.
#3
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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