For the system pressure control valve, should it operate in emergency open mode or emergency close mode?
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Should the system pressure control valve, that is, the emergency vent valve, be set to open in an emergency or to close in an emergency? Seeking advice
According to the fail-safe principle, it should be designed to turn off in case of a failure.
Not necessarily; factors such as safety and process requirements need to be taken into account. For example, the pressure control valves in some conversion systems are FC valves, which shut off in emergency situations.
This requires a combination of technology and safety, as the two complement each other
For safety when opening the valve in case of an accident, choose FO; for safety when closing the valve, choose FC
Could you tell us whether the valves in your respective plants are designed to open in case of an accident or to close in such situations? And which design institute designed the process? Transformation, methanol washing, liquid nitrogen washing