Method for detecting tiny leakage of oil transmission pipeline

Abstract

The invention discloses a method for detecting the tiny leakage of an oil transmission pipeline. The method comprises the following steps of: arranging a strong magnet at a mileage peg along a pipeline; transmitting a spherical inner detector into the pipeline at the head end of a pipe section to be detected, and getting the spherical inner detector back at the tail end of the pipe section to be detected; transmitting sound, accelerated speed, magnetism and time data which are recorded by a memory in the spherical inner detector to a computer; processing a magnetic signal, a sound signal and an accelerated speed signal respectively to obtain a relational graph of amplitude values and time of the signals; extracting a sound abnormal signal to determine the time when leakage points occur; and determining distance between the leakage points and a certain mileage peg according to the perimeter of the spherical inner detector and periodicity of the accelerated speed signal between the time of the leakage points and the time of a certain magnetic spike signal. The method has the advantages of high detection sensitivity, difficulty in blockage, convenience in use and accurate positioning.

Description

technical field [0001] The invention relates to a method for detecting micro-leakage of an oil pipeline. It belongs to the technical field of detecting pipeline leakage. Background technique [0002] With the rapid development of the pipeline transportation industry, the increase of pipelines, the increase of pipe age, the manufacturing defects, construction defects and corrosion of the pipeline itself, and man-made damage, etc., pipeline accidents occur frequently, causing damage to people's lives, property and living environment. Therefore, the timely detection and location of pipeline leakage has important practical significance. [0003] At present, there are mainly two types of various pipeline leakage detection and location methods at home and abroad: one is the external detection method that detects changes in physical parameters such as flow, pressure, and sound caused by leakage. Most of them are negative pressure wave leak detection method. When the pipeline rup...

AI Technical Summary

Problems solved by technology

This method is accurate and has high precision. The disadvantage is that when detecting pipes with different diameters, it is necessary to replace the in-pipe detectors of corresponding diameters. The volume is large, the risk of blocking or even damaging the pipes is high, and the detection cost is high.

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