'Helium hood method' long-distance pipeline leakage point troubleshooting and positioning device and troubleshooting method

Abstract

The invention belongs to the nondestructive testing technology, and particularly relates to a 'helium hood method' long-distance pipeline leakage point troubleshooting and positioning device and troubleshooting method. The device comprises a flow supply and control plate A arranged at the upstream of a detected pipeline, and a helium hood and a helium applying plate B connected with the detected pipeline. The helium hood and helium applying plate B is composed of a helium hood, a helium concentration detector, a pressure reducing valve, a helium supply switch, a helium pressure stabilizing tank, a helium cylinder and a pressure gauge. The method comprises the following steps of: purging the pipeline to remove residual working gas, installing the helium hood on the detected pipe section, inflating the detected pipe with helium, checking leakage points, taking flange opening positions at the two ends of an inlet and an outlet of the pipeline as detection interfaces, applying a long-distance helium hood to the pipeline in the process, checking and positioning the leakage points of the pipeline by stages so as to determine the number and positions of leakage points of the buried pipeline. The method is safe and reliable, and can carry out leakage detection in flammable, explosive, high-temperature and other high-risk places.

Description

technical field [0001] The invention belongs to the non-destructive testing technology, and in particular relates to a pipeline leak point checking and positioning device and checking method. Background technique [0002] At present, although there are many pipeline sealing verification methods in the field of non-destructive testing, there are few technical methods for pipeline leak location, especially for outdoor long-distance pipeline leak location. Therefore, it is necessary to develop a method suitable for long-distance A new method for locating leaks in single-wall pipes. [0003] The oil and gas transportation industry mainly pre-installs leak detection devices during the pipeline installation stage and requires regular weak current to carry out leak detection work. However, this method has low leak sensitivity, and because it needs to be powered on, it is not suitable for transportation pipelines of flammable and explosive media such as hydrogen and chlorine. The h...

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