This text introduces main technical requirements for the material of CNG(Compressed Natural Gas) tube trailer gas cylinders, various kinds of performance, such as chemical composition, mechanical properties, Corrosion, etc.

Aiming at surface damages on in-service automobile-used gas cylinders made by composite materials,this study applied finite element software to research on how surface damages had impact on the composite materials.

Orthogonal analysis calculation on upsetting forming of internal wall of gas bottle;

Application of orthogonal experiment in the top-upsetting forming technology of internal wall of gas bottle;

The current tendency for gas bottle lightening and the possibility of developing the natural gas filling line by the new storage method were introduced as well.

Whereas there are still no relevant national or industrial standards for large volume steel seamless cylinder′s design,manufacture,inspection and assembly.

The content of the standard (draft) of Liquefied Dimethyl Ether Cylinder and the design calculation of a liquefied dimethyl ether cylinder are introduced.