Marine natural gas storage tank

Abstract

The invention relates to the technical field of LNG, in particular to a marine natural gas storage tank. It includes an inner container, an outer shell sleeved outside the inner container, a liquid outlet pipe that communicates with the inner container and passes out of the outer shell, and an anti-leakage component; the anti-leakage component includes a leak-proof sleeve, a filling tube and a sealing device ;The leak-proof casing is sleeved on the liquid outlet pipe; an interlayer ring cavity is formed between the leak-proof casing and the liquid outlet pipe; one end of the filling tube is fixed on the leak-proof sleeve and communicates with the interlayer ring cavity; Together with the interlayer annular cavity, a closed chamber is formed; the sealing device is arranged on the filling pipe to block the closed chamber in one direction; the blocking device only allows the outside air to enter the closed chamber in one direction through the blocking device; The closed chamber is filled with inert gas, and the air pressure in the closed chamber is higher than the design vapor pressure of the inner container. Under the action of pressure difference, the inert gas forms an air seal effect on the liquid outlet pipeline, which prevents the liquid from overflowing from the liquid outlet pipeline and greatly reduces the amount of low-temperature liquid ejected.

Description

technical field [0001] The invention relates to the technical field of LNG, in particular to a marine natural gas storage tank. Background technique [0002] see figure 1 , in the prior art marine natural gas storage tank, the inner container 1' is inevitably provided with an opening under the lowest liquid level, the opening is fixed with a liquid outlet joint 3', and the inner container 1' passes through the liquid outlet joint 3' It is connected and communicated with one end of the stainless steel pipe 4'. The stainless steel pipe 4' protrudes from the shell 2' and is welded with the shell 2', and the other end of the stainless steel pipe 4' is welded with the shut-off valve 5'. Among them, the stainless steel pipe 4' needs to be bent to meet the process nozzle and design requirements. [0003] During the installation and manufacturing process of the stainless steel pipe 4', the following factors will lead to the risk of accidental leakage of the stainless steel pipe 4...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a marine natural gas storage tank to solve the problem in the prior art that the low-temperature liquid in the stainless steel pipeline of the marine natural gas storage tank endangers the safety of the ship

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