Your diagram snippit shows you have two pressure controllers. There is a bubbled 'PC' just to the right of the valve to flare. Does the dashed line from that PC lead to another pressure control valve? Is the primary pressure controller modulating a valve to the 'main line'? The pressure control valve to flare should only open when the primary pressure control loop is not adequate. You can choose where to send the gas, but you will need a safe place to vent the vessel for system maintenance anyway. Is there a pressure safety valve also routed to flare nearby? So why not route a secondary pressure control valve into the same flare header? If you are 'losing production repeatedly' to the flare, your system is inefficient. The problem is not with the location of the secondary pressure control valve, but with other parts of the pressure control system.
Hello Pilesar,
You are right, My snippit has two PC, but I have seen other configuration where there are only one PC flaring production to flare in case of surplus, my question is why not put the PC on gas outlet ? I heard somewhere that it can cause back pressure on the separator, is this true statement ?
My second question is, can we put PC on gas outlet if we had compressor downstream ? I have never heard of PC upstream of compressor , how can we control such configuration ?
Thanks