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Structure and Operating Principle

The structure of an LNG vehicle cylinder comprises the inner tank, the outer tank, tank‑side valves, an LNG level sensor, and thermal insulation. The tank is a high‑vacuum insulated vessel designed for storing LNG; its main structure consists of an inner liner and an outer shell, with a vacuum‑filled, thermally insulated space between them. The inner liner is rated for a maximum working pressure of 1.59 MPa, while the design pressure is taken as twice this value. A multilayer insulation system—comprising glass‑fiber paper and smooth aluminum foil—is wrapped around the inner liner’s exterior. Under high‑vacuum conditions, this multilayer material exhibits low thermal conductivity, excellent insulating performance, and light weight. The interlayer also incorporates palladium oxide and molecular sieves to extend the vacuum’s service life. The outer shell is engineered to form an annular space with the inner liner, ensuring superior thermal insulation; the better the insulation, the longer the LNG can be stored in the tank.

Release Date:

2021-09-01

The structure of an LNG vehicle cylinder comprises the inner tank, the outer tank, tank interface valves, an LNG level sensor, and thermal insulation.
A storage tank is a high‑vacuum, thermally insulated vessel designed to store LNG. Its primary structure comprises an inner liner and an outer shell, with a vacuum‑insulated space between them. The inner liner is rated for a maximum operating pressure of 1.59 MPa, while the design pressure is taken as twice this value. A multilayer insulation system—consisting of glass‑fiber paper and smooth aluminum foil—is wrapped around the outer surface of the inner liner; under high‑vacuum conditions, this multilayer material exhibits low thermal conductivity, excellent insulating performance, and light weight. The interlayer is further equipped with palladium oxide, molecular sieves, and other materials to extend the service life of the vacuum. The outer shell is engineered to form an annular space with the inner liner, ensuring superior thermal insulation; the better the insulation, the longer the LNG can be stored in the tank.

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