Amas123
Petroleum
- Apr 4, 2022
- 1
Hi,
I have a balanced relief valve to verify in flarenet.
The valve is 4P6. The downstream piping is 10" to give a rhov2 less than 150,000kg/m/s2 and mach no < 0.75 in the downstream tailpipe.
The expander is flange to flange with the relief valve, but has sonic velocity at the inlet (/relief valve nozzle) and rhov2 > 200,000.
Backpressure is ok.
There are no AIV issues.
Is this typically acceptable? All guidance talks about downstream *piping*, not so much the conditions at the valve discharge itself. If there are no weak fittings and just straight pipe between the valve discharge and expander, is there actually a mechanism for failure? Considering the force at any restriction is proportional to rhov2*d2, but there is no 'd2' term for the fluid momentum to act against.
I have a balanced relief valve to verify in flarenet.
The valve is 4P6. The downstream piping is 10" to give a rhov2 less than 150,000kg/m/s2 and mach no < 0.75 in the downstream tailpipe.
The expander is flange to flange with the relief valve, but has sonic velocity at the inlet (/relief valve nozzle) and rhov2 > 200,000.
Backpressure is ok.
There are no AIV issues.
Is this typically acceptable? All guidance talks about downstream *piping*, not so much the conditions at the valve discharge itself. If there are no weak fittings and just straight pipe between the valve discharge and expander, is there actually a mechanism for failure? Considering the force at any restriction is proportional to rhov2*d2, but there is no 'd2' term for the fluid momentum to act against.
