Seeking advice on the relief temperature of safety valves
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Many posts state that the discharge temperature in a fire scenario should be based on the saturation temperature corresponding to the setting pressure of the safety valve. But what about supercritical conditions? For example, the critical pressure of ethanol is 6.4 MPa, its critical temperature is 243 degrees, and the setting pressure of the safety valve is 7.5 MPa. How then can the discharge temperature be determined? In Aspen, it’s not possible to calculate the temperature corresponding to the critical pressure when dealing with supercritical conditions. So, is it acceptable for me to use the design temperature of the equipment instead?
It’s going in the opposite direction; the design temperature of the equipment is determined based on your medium
The saturation temperature generally refers to the condition in which, when the medium is in the liquid phase, a fire occurs and the substance is released in gaseous form; therefore, it is determined based on the saturation temperature. In the supercritical state, it should be considered based on gas-phase fire conditions; the saturation temperature is no longer relevant.