It is difficult to obtain the interlayer vacuum degree of the LNG (liquified natural gas) vacuum multi-layer insulation pipe at any position, especially for pipes that are in service. Thus, this paper proposes a method for measuring interlayer vacuum degree of the vacuum multi-layer insulation pipe by temperatures. A vacuum multi-layer insulation pipe model was built to find the temperature parameters, and a field investigation and experiments with a test bench were carried out to verify the simulation results. The experimental results show that the simulation results have a good reference value for actual measurement. This method for measuring the interlayer vacuum degree will play an important role in the popularization of vacuum multilayer insulation pipes.
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