System and method for transferring liquified petroleum (LP) gas

A LP gas evacuation system for evacuating both liquid phase and vapor phase LP gas from a first tank, comprising:

• an inlet port configured for connection to an excess flow valve associated with the first tank to receive LP gas from the first tank;
• an outlet port configured for connection to a second tank;
• a pump coupled between the inlet port and the outlet port and operable to pump the LP gas from the first tank via the inlet port to the second tank via the outlet port, wherein the pump is a pneumatically driven displacement pump operable to pump both liquid phase and vapor phase LP gas;
• and
• a pneumatic pressure regulator configured and arranged to receive a supply of compressed air and to provide the compressed air to the pump at a specified pressure.

A method for transferring LP gas from a first tank to a second tank, the method comprising:

• providing a pump operable to pump both liquid phase and vapor phase LP gas, the pump having a suction port configured to be connected to the first tank and a discharge port configured to be connected to the second tank;
• connecting the suction port of the pump to the first tank via a first conduit;
• connecting the discharge port of the pump to the second tank via a second conduit;
• connecting a valve in series with the pump, the first conduit, and the second conduit;
• powering the pump to transfer both the liquid phase and vapor phase LP gas from the first tank to the second tank at or below a flow rate of 2.0 gallons per minute;
• and closing the valve when the flow rate exceeds 2.0 gallons per minute.