Multiple relief valve - Relief load
Multiple relief valve - Relief load
(OP)
In sizing multiple relief valves, should each valve be sized for full relief load? OR the Total relief load should be shared between the multiple valves?
Please, i need clarification.
Please, i need clarification.





RE: Multiple relief valve - Relief load
Tell us more about the type of process and specifically what is being protected by the valves......
RE: Multiple relief valve - Relief load
Typically, each valve has at least 25% of the total required area.
At least one valve should have set pressure less than or equal to the vessel MAWP.
The other safety valves may have set pressure less than or equal to 105% of MAWP.
RE: Multiple relief valve - Relief load
(if you have 5 PSV each will be 24% of the max flow)
One with a lower set-point is a nice trick to overcome small bumps, but you need to make sure that your vent line stay atmospheric (otherwise you will cause back pressure on the others)