This project researched and designed a vacuum test device for the sandwich of low-temperature insulated pressure vessels in use, and successfully developed a deflagration test device and a vacuum gauge for hazardous environments with suitable ranges. The research results are used to guide the thermal insulation performance test of LNG cryogenic insulated pressure vessels in a "safe" environment. In the testing of special equipment such as cryogenic liquid storage tanks and LNG transport semi-trailers, it is guaranteed to the greatest extent that the cryogenic insulated pressure vessels are The safe operation of the use process and the inspection process can effectively reduce the loss caused by the accident and protect the lives and property safety of the people.

At the same time, the promotion of research results can maximize the detection efficiency and reduce the cost of inspection and use of low-temperature insulated containers. It has great social significance to achieve low overall cost, high detection efficiency, good safety and good environmental impact.