PSV for piping protection
PSV for piping protection
(OP)
I need to protect a 1 1/2" pipe from overpressure, it is on the outlet of a desuperheater. The conditions are:
11321 lb/hr steam
665 psia
740 F
Set pressure of PSV is 730 psig.
I need to know where to start.
Can I take the conditions of saturated steam at 730 psig, subtract the above conditons and size the psv for that flowrate? or is it more complicated? Assuming, although incorrectly, that the above conditions are for saturated steam.
11321 lb/hr steam
665 psia
740 F
Set pressure of PSV is 730 psig.
I need to know where to start.
Can I take the conditions of saturated steam at 730 psig, subtract the above conditons and size the psv for that flowrate? or is it more complicated? Assuming, although incorrectly, that the above conditions are for saturated steam.





RE: PSV for piping protection
Typically, you do not see a lot od lines being protected as they are useually protected by some vesssels relief valve. The only time you need to protect a line is when there is a pressure letdown and you have a specification change in the piping and need to protect in case of a control valve failure OR if you expect a fire or thermal case on a line that can be isolated.
RE: PSV for piping protection