3 replies to this topic

[johneyissac98]

Hi,
My question is ,
1. Why distillation column overhead has two psv which has almost same set points i.e psv1= 4.5ksc , PSV2 = 4.6ksc

[Pilesar]

Possibilities for the reason for two PSVs: plant might switch between them for maintenance or one was not large enough for the scenario. The close set points may be a mistake. Somewhere there should be calculations for the required pressure relief of this column. If you find them, report your conclusions so we can learn also.

[shvet1]

What do you mean 'set point'? Set pressure? Cold differencial test pressure? Has those been designed&installed at the same time? Are those identical?

 

What jurisdiction? ASME or PED?

Edited by shvet1, 16 January 2024 - 11:32 PM.

[fallah]

Hi,
My question is ,
1. Why distillation column overhead has two psv which has almost same set points i.e psv1= 4.5ksc , PSV2 = 4.6ksc

 

Hi,

 

It might one PSV is operating and another is standby, if so there would be no problem for minor difference between set points.

Please upload a snap shot of the PSVs arrangement from relevant PID to get a more proper response...