How is the set pressure value for the safety valve of the depropanization tower determined?
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This post was last edited by liaifeng on 2020-5-14 21:16. Hello everyone, when designing the gas handling system, the operating pressure of the depropanization tower is generally 1.9 MPAG, but the set pressure of the tower’s safety valve is 2.31 MPAG. Does anyone know how 2.31 was determined? The overpressure due to power interruption is 10%, which amounts to only 2.09 MPa; thank you
Under normal circumstances, the set pressure of a safety valve is determined as design pressure * 1.1 + back pressure. Take your example: 1.9*1.1 + back pressure = 2.31; your back pressure should be around 0.29. . . . . :$
If the back pressure is very high, it may result in a setting pressure that is much higher than the designed pressure, posing safety risks to the operation of the equipment, as the safety valve fails to perform its intended function.
I heard for the first time that a back pressure needs to be added when using a safety valve to set a pressure level; what you said is incorrect. Thank you.
Okay, I was wrong....:L
It should be calculated based on the equipment, such as the design pressure of the depropanization tower; it has little to do with the operating pressure. Safety valves are primarily used to protect equipment
Operating pressure and design pressure are two different concepts; back pressure affects the size of the nozzle. .
This post was last edited by wx_Catherine_Mi on 2020-5-22 at 10:37. Operating pressure: 1.9, design pressure: 2.1