How to set the operating pressure of the torch separator tank
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Consider that after the safety valves for ethylene, propylene, C4, and C5 activate, the fluid is discharged into the flare skid tank. How to determine the operating pressure? How to set the temperature?
I need to do the calculations first~ I recommend Aspen Flare; if you need help, message me~ ;P
I have never used Aspen Flare. And. Not all safety valves trip at the same time. Consider only the case where one safety valve activates
Are you referring to the liquid separation tank for low-pressure gas lines? It’s just a matter of deciding what medium to use for pressurizing the oil; the choice is determined by the pressure of that medium. There’s no need to consider the activation of safety valves, as there’s no backpressure. The design team takes such factors into account when designing the pipelines, so I’m not sure if my thinking is correct
The flare liquid separation tank should be capable of handling the discharge volume resulting from the maximum release across the entire plant. If a sonic flare is not used, but rather a regular flare, the maximum operating pressure of the liquid separation tank should not exceed 2 BARG.
The pressure is normal everywhere thereafter. When designing, the design institute takes into account the possibility of safety valves activating simultaneously in accordance with relevant standards; at such times, the pressure in the flare system network remains low, with the highest pressure occurring after the safety valves and not exceeding 0. The gauge pressure of 15 MPa (for low-pressure torches) is generally much lower than this value
One safety valve has activated, and the operating temperature and pressure have no impact at all; a back pressure of 10 kPa is sufficient. The pressure of the medium in your system isn’t low, so back pressure doesn’t matter either