For the line sizing of the inlet line to a Pressure Safety Valve, why do we consider only non-recoverable i.e. frictional losses for pressure drop calculation? Why don't we consider the accelerational and static head losses for it?
Also, what is the logic behind the 3% rule for the inlet line sizing to the PSV?
What are the criteria for sizing the outlet line from a PSV? The outlet line is generally larger in size than the inlet line. Any reason for this?
Regards.