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Air tightness checking device and method by liquid nitrogen pressurization and gasification

A technology of air tightness inspection and liquid nitrogen, which is applied in the direction of using liquid/vacuum degree for liquid tightness measurement, etc., can solve the problems of gas cylinder consumption and long charging time, and achieve high safety and wide application range Effect

Inactive Publication Date: 2017-06-16
SHANGHAI HUALIN IND GASES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods such as small air compressor compressed air, gas cylinder supply and other methods can only meet small equipment and pipelines. When facing large pipeline equipment, the charging time will be too long and a large amount of cylinder gas will be consumed; while liquid nitrogen Tank car gas supply is limited by supply time and cost

Method used

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  • Air tightness checking device and method by liquid nitrogen pressurization and gasification

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Experimental program
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Effect test

Embodiment 1

[0042] The equipment of the present invention comprises a liquid nitrogen tank 1, a liquid nitrogen booster pump 2, a vaporizer 4, valves, pipelines, indicators and safety valves.

[0043] Install the liquid nitrogen outlet valve HV-2 at the bottom of the liquid nitrogen tank 1, and connect the pump inlet elbow C, and set the supply line safety valve PSV-2 and solenoid valve SOV-2 on the connecting pipe in sequence;

[0044] The pressure relief valve HV-1 and the storage tank safety valve PSV-1 are installed on the top of the liquid nitrogen tank 1. These two valves are used to ensure that the pressure in the liquid nitrogen tank 1 is in a stable state; when the pressure in the liquid nitrogen tank 1 is too high When , the storage tank safety valve PSV-1 automatically takes off to release the pressure.

[0045] Install temperature element TE-1, low temperature controller TC-1 and pump start-up indication LT-4 at pump return elbow D;

[0046] Install a pipe at one end of the ret...

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Abstract

The invention relates to the air tightness checking field, particularly to an air tightness checking device and method by liquid nitrogen pressurization and gasification. The device comprises a liquid nitrogen tank (1), a liquid nitrogen pressurization pump (2) and a motor, and a gasification device (4); and a nitrogen pipe is laid. Liquid nitrogen is conveyed to the inlet of the pressurization pump by a pipe; and nitrogen is returned to the liquid nitrogen tank (1) by a pipeline. Liquid nitrogen is pressurized by the pressurization pump (2) to form high-pressure liquid nitrogen that is conveyed to the gasification device (4); and the high-pressure liquid nitrogen is gasified into a high-pressure N2 at an environment temperature and then the N2 is conveyed to a high-pressure N2 pipe network for distribution to all service stations. Compared with the prior art, the equipment and method have advantages of simple flow, high security, wide application range, sufficient gas source, and low cost and can be applied to various air tightness testing and checking.

Description

technical field [0001] The invention relates to the field of air-tightness inspection, in particular to an air-tightness inspection device and method with simple equipment, meeting the needs of large-scale pipeline air-tightness test or inspection, and low cost by using pressurized gasification of liquid nitrogen. Background technique [0002] The air tightness test is mainly to check whether there is any leakage in the container and the connecting parts. For pressure vessels with extremely toxic medium, highly hazardous or design that does not allow a small amount of leakage, the airtightness test must be carried out. The newly-built pressure pipelines and pressure vessels of petrochemical and other enterprises basically need to be tested for air tightness, and the enterprises basically have planned overhaul or temporary equipment inspection and maintenance every year. It is inevitable to disconnect the pipeline or open the equipment. Afterwards, the piping equipment needs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/02
CPCG01M3/02
Inventor 吉荣王乘东项吴定钟华徐晶钱海玲谢惠云宋孝林唐青蒋旭沈伟高嵩曹生付学江
Owner SHANGHAI HUALIN IND GASES
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