LNG storage tank cofferdam automatic pumping system

The utility model discloses a LNG storage tank cofferdam automatic pumping system, including power supply circuit, automatic control circuit, liquid level control circuit and immersible pump, power supply circuit's A, B, C three -phase pass through circuit breaker, contactor coil's NO -contact, electrothermal relay and converter and connect the immersible pump, power supply circuit's C communicated with each other an isolator and was connected with the input of transformer, the transformer with automatic control circuit is parallelly connected, and the output positive end of transformer establishes ties and has bridge rectifier, and bridge rectifier connects through the 2nd isolator liquid level control circuit, connect in parallel and have LNG to detect control circuit in liquid level control circuit's input/output both ends. The utility model discloses a level control apparatus can monitor the liquid level height to automatic start precipitation is dropped to when the water level and is set for when high, s