Natural gas refers to the combustible gases contained in the strata. It is mainly a mixture of low molecular alkanes. It can be divided into two types: dry gas and natural gas. The dry ingredients are methane. Multilate, propane, and butane.

The main component of LiqueFied Nature Gas is methane, as well as a small amount of ethane and propane. LNG's natural gas is colorless, odorless, non-toxic, non-corrosive, natural gas can be liquefied around normal pressure and -162 ° C. The volume of liquefied natural gas is about 1/625 of the gas volume.

Under normal pressure, the density of LNG is about 430-470kg/m³ (slightly different due to the composition), the burning point is about 650 ° C, and the thermal value is 52 mbtu (1 mmbtu = 2.52 × 108cal), the explosion limit in the air (Volume) 5%-15%. LNG storage is one of the natural gas storage methods. The LNG storage tank is usually a double -layer metal tank. The inner material of the contact with LNG contains 9%Ni low -temperature steel, the outer material is carbon steel, the middle heating layer is expanded perlite, and the base heating layer of the can is foam glass.