Low temperature insulation cylinder divided industrial gases, liquefied natural gas and liquefied natural gas vehicle cylinders as mobile pressure vessel is widely used in many fields of biological, pharmaceutical, chemical, machinery, metallurgy and scientific research. As a special equipment transport, storing cryogenic liquefied gas will gradually first generation of permanent high-pressure gas cylinders. Such as: a low-temperature insulation cylinder can replace more than 30 high-voltage only (16Mpa) cylinder use, this low-temperature insulation cylinder containing gas or liquid can be used which can be used in low pressure, high pressure or high pressure, with absolutely low heat the rapid increase in the number of bottles, according to "to Safety and Supervision" and "Regulations on Safety Supervision of Special Equipment", cryogenic insulation cylinders must be inspected every three years, after three years due to the low temperature insulation cylinder test period exceeds a predetermined, not effective inspection, parts of cryogenic insulation cylinder explosion accidents have occurred, therefore, extended the use of low-temperature insulation cylinder currently there is a big security risk. Therefore, low temperature insulation cylinder periodic inspection and repair is particularly important, and achieved qualification PD5 National Quality Supervision, Inspection and Quarantine issued by the company, in order to carry out regular inspections of foreign low-temperature insulation cylinders. Product attributes 1; HD-NYCS-1 type tank pressure test apparatus 2; HD-CZK-1 type vacuum test device 3; HD-QMCS-1-type air-tightness testing device 4; HD-JCSY-1 Sandwich pressure test device 5; HD-JTCS-1 type static evaporation rate testing device other indication of periodic inspection of cylinders cryogenic insulation, the state has no inspection and evaluation standards and safety specifications for low temperature insulation cylinders. Low temperature insulation cylinder inspection process even continuous improvement process to constantly sum up, a more rigorous scientific and reasonable inspection program