A device for detecting the sealing performance of a cryogenic liquid tank and its operating method

Abstract

The invention discloses an apparatus of detecting sealing performance of a low temperature liquid tank, and an operation method of the same. The low temperature liquid tank includes an inner tube, an outer tube, an interlayer between the inner tube and the outer tube, and a detection apparatus body, wherein the detection apparatus body includes a pressure meter which is in pipe connection with the inner tube, a vacuum-pumping set which is in pipe connection with the interlayer; the vacuum-pumping set includes a vacuum gauge which is used for detecting the degree of vacuum of the interlayer, a vacuum pump which is in pipe connection with the air outlet end of the vacuum gauge, and an argon content detector which is arranged at the air outlet end of the vacuum pump; and a jacket vacuum valve is in pipe connection between the vacuum gauge and the interlayer. The apparatus of detecting sealing performance of a low temperature liquid tank utilizes the vacuum pump to quickly realize vacuum-pumping; the argon content detector is arranged at the output end of the vacuum pump, thus being convenient for detecting whether leakage exists in the inner tube after the inner tube is filled with argon; by means of the vacuum gauge and the pressure meter, the apparatus of detecting sealing performance of a low temperature liquid tank can quickly detect whether leakage exists in the outer tube; and the apparatus of detecting sealing performance of a low temperature liquid tank is simple in structure, is low in manufacturing cost, and is significant in detecting the sealing effect of the low temperature liquid tank.

Description

technical field [0001] The invention relates to the technical field of low-temperature liquid tanks, in particular to a device for detecting the airtightness of a tank body and an operation method thereof. Background technique [0002] Cryogenic storage tanks or tank trucks are indispensable equipment in the storage and transportation of industrial gas and natural gas. According to relevant national standards and technical specifications, such equipment belongs to special equipment. This equipment has a double-layer structure, and the jacket is wrapped in multiple layers or filled with perlite powder and then vacuumed for heat insulation. After a period of use, this type of storage tank has structural rupture, damage and leakage due to various reasons, resulting in the loss of vacuum and thus losing its insulation function. [0003] Finding which floor the leak is located is the first step in the repair process. When the leakage is large, it can be detected by the foam of ...

AI Technical Summary

Problems solved by technology

When the leakage is large, it can be detected by the foam of the cleaning solution. When the leakage is small, the foam liquid cannot be used for detection. At present, helium leak detector is usually used for inspection. The method of helium leak detection has the advantages of fast and accurate, but due to the market The price of helium is high. It takes a lot of helium to detect a large-volume cryogenic storage tank. Since it is not known which layer is leaking, it is necessary to repeatedly fill the inner cylinder or interlayer with helium, so the cost of helium detection is relatively high. , at the same time, after it is impossible to determine which layer has leaked, if the inner cylinder and the outer cylinder are rashly separated for maintenance, the maintenance cost will inevitably increase

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