Testing device and method for air tightness test of low-temperature tank car

Abstract

The invention discloses a testing device and method for the air tightness test of a low-temperature tank car, and relates to the technical field of low-temperature tank car air tightness test. The testing device comprises a tank car used for conveying low-temperature liquid, a liquid-phase pipe of the tank car is connected with a liquid-phase conveying pipeline, the liquid-phase conveying pipeline is connected with a second connecting pipe, and the second connecting pipe is connected with an input end; the output end of an anti-freezing air temperature vaporization assembly is sequentially connected with a pressure sensor, a safety valve, an electromagnetic valve and a first connecting pipe, one end of the first connecting pipe is connected with a gas phase conveying pipeline, the gas phase conveying pipeline is connected with the liquid phase pipe on the tank car, a first control valve is arranged on the gas phase conveying pipeline, and an emptying pipe is arranged on the liquid phase conveying pipeline. And a third control valve is arranged on the emptying pipe. According to the invention, airtightness test and test operation can be rapidly carried out on the low-temperature tank car, the inspection qualification standard of the low-temperature tank car by our company is met, and the airtightness detection effectiveness and reliability of the low-temperature tank car are greatly improved.

Description

technical field [0001] The invention relates to the technical field of tank car air tightness testing, in particular to a low-temperature tank car air tightness testing device and method. Background technique [0002] Cryogenic tank trucks mainly transport liquid nitrogen, liquid oxygen, liquid argon, LNG and other low-temperature media. Because they are transported on the road all year round, tanks and pipelines are prone to leaks. Small leaks will bring huge safety hazards. During the air tightness test, every The key inspection items of this periodic inspection. Among them, the "Mobile Pressure Vessel Safety Technology Supervision Regulations" (TSGR0005) and "Periodic Inspection Rules for Pressure Vessels" (TSG R7001-2013) have clear regulations on the airtightness test. The airtightness test pressure is the design pressure of the tank. And keep the pressure for enough time for inspection, and no leakage is the qualified standard. [0003] At present, our company needs ...

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Problems solved by technology

[0003] At present, our company needs to conduct air tightness test and test operation on the low-temperature tanker. During the inspection of the low-temperature tanker, the user is generally required to fill up a certain medium to keep a certain pressure inside the low-temperature tanker. However, for safety reasons, the tanker The pressure still cannot reach the design pressure and cannot meet the requirements of the air tightness test. The existing conventional practice is to wait for the natural evaporation and pressurization of the tank car. Due to the vacuum insulation of the tank car, it generally takes a long time to wait. In the cold winter, the natural evaporation and supercharging cannot even reach the required pressure, and the effect of the air tightness test is greatly reduced. In addition, in the process of converting the low-temperature liquid into a gas, the conventional air-temperature evaporator will also frost into ice. , which is even more serious in the cold winter, and cannot meet the rapid test of the airtightness of low-temperature tankers, which brings great trouble and inconvenience to the staff of the company and the tested personnel, which is not conducive to the development of the work of the company, resulting in low temperature The progress of the airtightness test of the tanker lags behind, which also causes economic burden and pressure on the inspected personnel

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