Hi all
Presently I am doing the PSV sizing and Inlet/outlet line sizing.
For PSV inlet line sizing we use the 3% pressure drop criteria at rated flow of PSV and properties like density, viscosity, Cp/Cv are taken at relieving conditions.
For PSV outlet line we use the mach no. and backpressure criteria according to type of valve.
I would like to know that for PSV outlet line sizing, properties should be taken at which pressure and temperature condition.
If the PSV is discharing to Flare header then can we consider the properties at flare header pressure and corresponding temperature at that pressure or we should use the properties at inlet relieving conditions.
Your guidance / inputs will be great help on this matter.
Thanks