PrudhoeBayAK
Chemical
- Mar 14, 2002
- 3
Looking over ASME BPV Section VIII Div 1 UG-135 I am slightly confused.
If I have 2 50% capacity relief valves protecting the vessel (i.e. both combined as 1 level of overpressure protection), each with 2" inlets, can I use a common 2" supply piping run?
Subpart (c) seems to imply the cross sectional area of each PSV inlet must be added, and used to calculate the NPS of the inlet line. Or, is it more an issue of the combined area of the API orifice size of the relief valves?
Is it ever ok to have a reducer in the discharge piping of a PSV?
Thanks!
If I have 2 50% capacity relief valves protecting the vessel (i.e. both combined as 1 level of overpressure protection), each with 2" inlets, can I use a common 2" supply piping run?
Subpart (c) seems to imply the cross sectional area of each PSV inlet must be added, and used to calculate the NPS of the inlet line. Or, is it more an issue of the combined area of the API orifice size of the relief valves?
Is it ever ok to have a reducer in the discharge piping of a PSV?
Thanks!