SU1710930A1 - Method of determining leakage point in pipeline - Google Patents

Abstract

The invention relates to pipeline transport and can be used to control pipeline systems laid in soil. The aim of the invention is to expand the application range and shorten the process time. At two points A and B on one side of the leak (point C), the intensity of the acoustic oscillations is measured at two frequencies fi, ft. According to the measurement results, the distance from one of the points to the point of leakage is calculated from the relation: X Inth / h Xo / lnifla - pj /) 4, where X is the distance from the first point A to the point of leakage (point C); Ho is the distance between points A and B; 1i, U2 are the intensities of acoustic oscillations at frequencies fi. fe at the first point A; 1z, 4 - the intensity of acoustic oscillations at frequencies fi, ft at the second point B. Il.

Description

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The invention relates to pipeline transport and can be used to control pipeline systems laid in soil.

The purpose of the invention is to expand the range of application and reduce the duration of the process.

Fig. 1 shows a diagram of the proposed pipeline: Fig. 2 is a block diagram of a device determining the distance to a leak.

The pipeline is shown with the first and second measurement points A and B and the point C, which is the leak point (Fig. 1}. The block diagram (Fig. 2) contains a converter 1 for fixing acoustic oscillations, amplifiers 2, 3, narrow-band low-pass filters 4 , 5, meters b, 7 of intensity, memory blocks 8, 9 and computing unit tO, including a separating device 11, a logarithm amplifier 12 and

logical unit 13 connected to the indicator 14.

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

At the beginning, the presence of leakage noise (acoustic oscillations) in any place in a controlled section of the pipeline, for example, by an operator during a detour route, is detected. Then, arbitrarily at a distance of 3-5 m, the first point A of measurements is selected and on the same side from the noise source - the second point B, within the limits that allow reception of acoustic oscillations. The transducer 1 at the point converts the acoustic oscillations caused by the leakage into an electrical signal. This signal is fed to amplifiers 2, 3, from which they are transmitted to filters 4, 5, filtering the two frequencies fi, fa, at which the meters 6, 7 determine

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the intensity of the 11. acoustic oscillations at point A, which is the energy transferred by an acoustic wave per unit time through a single area, perpendicular to the direction of wave propagation.

Intensities i, l2 are memorized by blocks 8.9. Similarly, at point B, the same frequencies, ft, h, are determined and the intensities JsJ4 of the acoustic oscillations are memorized. Thereafter, the computing unit 10 calculates the distance from the first point A to the point of leakage (point C) from the relation

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where X is the distance from the first point A to the point of leakage (point C);

X0 is the distance between points A and B;

3i, For the intensity of acoustic oscillations at two frequencies fi, fz at the first point A ;.

Зз. 3 "intensity of acoustic oscillations at two frequencies ft, fa at the second point B.

The result of calculating the distance X is fed to the indicator 14.

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Claims (1)

Invention Formula The method of determining the location of a leak in a pipeline, at which one of the parameters of acoustic oscillations at two frequencies is measured at two points along the pipeline and from the measurement results is calculated the distance from one of the points to the point of leakage, which is extending the application range and shortening the process time, the intensity of acoustic oscillations is measured as a parameter at two frequencies, the measurement points are chosen on one side of the leak, and the distance to the last is calculated from the ratio 20 X taljl X0 where X is the distance from the first point to the leak; X0 is the distance between two points; .vli. } 2 - the intensity of acoustic oscillations at two frequencies at the first point; Зз, 3 $ - the intensity of acoustic oscillations at two frequencies in the second point. BUT Bb t evi co & 3