A leak detection method for chemical pipelines

Abstract

The invention discloses a leak detection method for chemical pipelines. The leak detection method comprises the following steps that pipeline welding lines to be detected are sealed and wrapped to form sealed space, and then mixed gas of nitrogen and helium is injected into a plurality of pipelines in a sealed mode; the sealing wrappage of the pipeline welding lines to be detected is opened, a helium mass spectrum leak detector is used for detecting whether gas leakage occurs or not in the pipeline welding lines to be detected, the helium is small in molecular weight and viscosity coefficientso that the helium can easily spread through leak holes to form pressure in the pipelines, the helium content is detected by a gas analyzer to determine whether the leakage rate of a pipeline system meets the working condition requirements by using the easy penetration of helium, and the safe operation of the system is ensured. One-time production can be successful, the method is simple, the mixedgas of nitrogen and helium is adopted, the detection cost is reduced, and the operation safety of the pipelines is improved.

Description

technical field [0001] The invention belongs to the field of chemical pipeline construction, and in particular relates to a chemical pipeline leakage detection method. Background technique [0002] With the development of the economy, toxic, flammable, explosive, and volatile small molecular weight high-risk medium systems (such as SiH4 (silane gas), SiHCL3 (trichlorosilane), SiH2CL2 (dichlorosilane) ), H2 (hydrogen), etc.) are increasing, and the requirements for the overall leakage rate of the pipeline installation are getting higher and higher, and the overall leakage rate of the pipeline system is required to be ≤1.0x10 -10 mbar.L / S, or even smaller, the general nitrogen leak detection or compressed air leak detection cannot meet the system requirements, and safety accidents are likely to occur during the trial operation stage. Contents of the invention [0003] The object of the present invention is to provide a chemical pipeline leakage detection method to overcome ...

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Problems solved by technology

[0002] With the development of the economy, toxic, flammable, explosive, and volatile small molecular weight high-risk medium systems (such as SiH4 (silane gas), SiHCL3 (trichlorosilane), SiH2CL2 (dichlorosilane) ), H2 (hydrogen), etc.) are increasing, and the requirements for the overall leakage rate of the pipeline installation are getting higher and higher, and the overall leakage rate of the pipeline system is required to be ≤1.0x10 -10 mbar.L / S, or even smaller, the use of general nitrogen leak detection or compressed air leak detection cannot meet the system requirements, and safety accidents are likely to occur during the trial operation stage

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