S/N

Configurations

Functions

①

Filter

Filter particles in the gas to meet requirements of booster pumps

②

Self-operated pressure regulator

Stabilize the pressure source to the set value, generally integrated with the filter

③

Check valve

Prevent process media from back-streaming into the nitrogen pipe networks, and prevent flare gas from back-streaming into the dry gas seal systems

④

Leakage collection tank

Collect the process media of seal leakage

⑤

Flowmeter

Monitor flow of systems, and generally integrated with the flow transmitter

⑥

Liquid level meter

Monitor the liquid level of leakage collection tanks

⑦

Pressure switch / pressure transmitter

Monitor pressure of systems and report to PCS rooms

⑧

Flow switch / flow transmitter

Monitor flow of systems and report to PCS rooms

⑨

Level switch / level transmitter (optional)

Monitor the liquid level of leakage collection tanks and report to central control rooms

⑩

Pressure gauge (optional)

Monitor pressure of systems