According to the relevant regulations of the safety technical inspection regulations of pressure vessels and the inspection regulations for pressure vessels, a new LPG storage tank will be tested in service for less than 6 years in service for 1 years. The purpose of the test is to find and eliminate the expansion of the existing or original defects in the operation and prevent the occurrence of accidents. The LPG storage tank can be safely and reliably used in the next cycle. Secondly, some safety hazards exposed during the operation of the LPG storage tank can not be or can not be eliminated during the production period, which can only be solved through tank inspection. For example, the liquid level meter jammed malfunction, the indication is inaccurate, the first flange leaks and the fastening is invalid.