Patent ID: 6635119
Filing Date: 2003-10-21
Classification: B08B,F17C,F26B

Abstract:
A method of cleaning a pressurized container, the method comprising the steps of:providing a pressurized container containing an amount of liquefied petroleum gas wherein the container has inlet and outlet valves; injecting a first quantity of heated nitrogen gas into the container to vaporize said liquefied petroleum gas and form a first nitrogen gas/petroleum gas mixture; venting the first nitrogen gas/petroleum gas mixture to a flare to incinerate the petroleum gas and release the nitrogen gas; injecting a second quantity of heated nitrogen gas into the container to vaporize remaining liquefied petroleum gas and form a second nitrogen gas/petroleum gas mixture; venting said second nitrogen gas/petroleum gas mixture to, the flare to incinerate the petroleum gas and release the nitrogen gas; and repeating the injection into the container of heated nitrogen gas and venting the mixture to the flare until the concentration of petroleum gas within the mixture reaches a predefined limit.