Sweeping method of LNG tank car before unloading

Abstract

In order to solve the problems that according to a traditional sweeping method, the sweeping range is large, a pipeline is long, an LNG tank car is not easily swept clean, and air is easily taken into a pipe net and a vaporizer, the invention provides a sweeping method of an LNG tank car before unloading. The sweeping method of the LNG tank car before unloading is characterized in that an unloading table hose is well and correspondingly connected with the LNG tank car, sweeping is prepared, a self-pressurization liquid phase hose is swept, a self-pressurization gas phase hose is swept, a liquid inlet hose is swept, and sweeping is finished. The sweeping method of the LNG tank car before unloading can well sweep the pipe net, the sweeping range is small, the LNG tank car is swept clean, and air cannot be brought into the pipe net.

Description

technical field [0001] The invention relates to the field of natural gas storage, in particular to a method for purging an LNG tank car before unloading. Background technique [0002] The purge process of the traditional LNG tanker before unloading: connect the hose of the unloading platform to the corresponding flange of the LNG tanker as required, confirm that the F12 valve and the tanker release valve F16 are closed, and then open the F15 release valve, The self-pressurized gas phase valve F4 of the unloading platform and the self-pressurized liquid phase valve F5 of the unloading platform, slowly open the gas phase valve F2 of the tanker, and see white smoke coming out of the self-pressurized liquid phase release valve F15 of the unloading platform, close F15, and the purge is completed. [0003] For the traditional purging method, the liquid inlet hose of the unloading platform is not purged, and the self-pressurized gas phase hose and liquid phase hose are directly pur...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of the traditional purging method such as large purging range, long pipelines, difficulty in purging clean, and easy introduction of air into the pipe network and gasifier, the present invention provides a purging method for LNG tank trucks before unloading. The method can blow the pipe network very well, not only the blowing range is small, the blowing is clean, and the air will not be brought into the pipe network

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