Oil, water and gas zero discharge pipeline closed emptying transmission system

The utility model discloses a zero release pipe closed evacuation switching delivery system for oil, water and gas comprising an oil trunk line, a gauging evacuation pipe line, a natural gas delivery pipe line and a storage tank. The inlet of the storage tank is connected with the gauging evacuation pipe line via a valve, the outlet of the storage tank is connected with the oil trunk line via a valve, a by-pass pipe line is equipped between the inlet pipe line and the outlet pipe line of the storage tank, a valve is equipped on the by-pass pipe line, and the gas outlet port is connected with the natural gas delivery pipe line via a valve. The utility model realizes the all separating recovery of oil, water and gas, and not issues the poisonous natural gas into the air, which achieves the cleaning producing from the primitive root. The oil storage tank retains no raffinate (contaminant) after the oil, water and gas evacuation switching delivery, which guarantee the safe and reliable storage of the oil storage