A low-temperature tank car air tightness test device and method

Abstract

The invention discloses a low-temperature tank car air tightness test device and method, which relate to the technical field of low-temperature tank car air tightness testing, including a tank car used for transporting low-temperature liquid, the liquid phase pipe of the tank car is connected to the liquid phase conveying pipeline, and the liquid phase transport The pipeline is connected to the second connecting pipe, the second connecting pipe is connected to the input end, the output end of the antifreeze air temperature vaporization component is connected to the pressure sensor, safety valve, solenoid valve and the first connecting pipe in sequence, and one end of the first connecting pipe is connected to the gas phase The conveying pipeline and the gas-phase conveying pipeline are connected to the liquid-phase pipe on the tanker. The gas-phase conveying pipeline is provided with a first control valve, the liquid-phase conveying pipe is provided with an emptying pipe, and the emptying pipe is provided with a third control valve. The invention can quickly carry out the air tightness test and test operation on the low-temperature tank car, meet our company's inspection qualification standard for the low-temperature tank car, and greatly improve the effectiveness and reliability of the air-tightness detection of the low-temperature tank car.

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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