SU1276936A1 - Method of detecting leakage spot in pipelines - Google Patents

Abstract

The invention relates to the field of leak testing of pipelines and improves the accuracy of determining the location of a leak by receiving signals at additional pairs of points. The points are located on two circumferential surfaces of the pipe, the wires, and each pair of points is on its line. The signals received from the leaks at additional points are amplified and fed to the inputs of the correlation meter of time intervals. In the latter, the difference in the signal arrival time at the points of each pair is measured. According to the position of the pair of points corresponding to the maximum difference of the time of arrival of the signal from the leak, judge t O; its location. 3 il.

Description

This invention relates to the monitoring of the leaktightness of products by an acoustic method.

The aim of the invention is to improve the accuracy of determining the location of a leak in pipelines by receiving signals in additional pairs of points.

FIG. 1 shows a block diagram of an apparatus for carrying out the inventive method; in fig. 2 shows the layout of signal reception points on the surface of the pipeline; in fig. 3 scan of the controlled section of the pipeline.

The apparatus for carrying out the method comprises electro-acoustic transducers 1-4 located on two circles on the surface of the pipeline. Amplifiers 5-8 are connected in series with the corresponding electroacoustic transducers and form with them the channels for receiving signals. The outputs of the reception channels through the switches 9 and 10 are connected to the inputs of the correlation meter 11, containing shift registers 12 and 13, to which the shift signal generator 14 is connected.

The method of determining the location of the leak in the pipelines is carried out as follows.

Acoustic signals from a leak located at point 15 are received in additional pairs of points 16 and 17, 18 and 19, 20 and 21, etc., located on two circles on the surface of the pipeline. Electroacoustic transducers located at these points transform acoustic signals from leaks into electrical ones. The last strengthened to the required

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My values are amplifiers 5–8 and, using switches 9 and 10, alternately connect the outputs of the signal receiving channels to the inputs of the correlation meter 11 time intervals. The magnitude of the delay step is determined by the pulse period of the generator 14 of the shift signals. In the time interval correlation meter 11, the coincidence of signals delayed by different values is determined, and with the best match, the difference between the signal arrival times and the leak is determined. The position of the pair of points corresponding to the maximum difference in the time of arrival of the signal from the leak is judged on its location.

Claims (1)

This invention relates to the monitoring of the leaktightness of products by an acoustic method. The aim of the invention is to improve the accuracy of determining the location of a leak in pipelines by receiving signals in additional pairs of points. FIG. 1 shows a block diagram of an apparatus for carrying out the inventive method; in fig. 2 shows the layout of signal reception points on the surface of the pipeline; in fig. 3 scan of the controlled section of the pipeline. The apparatus for carrying out the method comprises electro-acoustic transducers 1-4 located on two circles on the surface of the pipeline. Amplifiers 5-8 are connected in series with the corresponding electroacoustic transducers and form with them the channels for receiving signals. The outputs of the channels with ma through switches 9 and 10 are connected to the correlation inputs of measure 11, containing shift registers 1 and 13, to which the generator 14 of shift signals are connected. The method of determining the location of the leak in the pipelines is carried out as follows. Acoustic signals from a leak located at point 15 are received in additional pairs of points 16 and 17, 18 and 19, 20, 21, etc., located on two circles on the surface of the pipeline. Electroacoustic transducers located at these points transform acoustic signals from leaks into electrical ones. The latter are amplified to the required size by amplifiers 5–8 and, using switches 9 and 10, alternately connect the outputs of the signal receiving channels to the inputs of the correlation meter 11 of time intervals. The magnitude of the delay step is determined by the pulse period of the generator 14 of the shift signals. In the time interval correlation meter 11, the coincidence of signals delayed by different values is determined, and with the best match, the time difference between the signal arrival from the leak is determined. The position of the pair of points corresponding to the maximum difference in the time of arrival of the signal from the leak is judged on its location. The method of determining the location of a leak in pipelines, which consists in receiving acoustic signals at two points along the length of the pipeline, measuring the difference in the time of arrival of the signal at these points, and determining the location of the leak in this way, characterized in that accuracy, receive signals in additional pairs of points located on two circles on the surface of the pipeline, so that each pair of points lies on its line, measure the difference between the arrival times of the signal and the points of each pair and position pairs of points sootvetstvuyup1emu maximum value of time difference of arrival is judged on the location of the leak.