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Pipeline leak detection method and system

A pipeline leakage and detection method technology, which is applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problems of small detection range, complicated operation, and low degree of intelligence, and achieve long-term pipeline health diagnosis, The effect of improving detection efficiency and improving positioning accuracy

Active Publication Date: 2018-12-28
CHANGZHOU CHANGGONG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In terms of equipment, pipeline leakage detection requires technicians to carry professional equipment, manually determine the location of the leakage point and then arrange the sensor, the detection range is small, and the operation is complicated; in terms of method, after the data of the pipeline leakage signal is measured, the non-dispersive Frequency band analysis, high requirements for operators, low efficiency and low intelligence

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  • Pipeline leak detection method and system
  • Pipeline leak detection method and system
  • Pipeline leak detection method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The method for detecting pipeline leaks in this embodiment includes:

[0053] Step 1: Arrange two sensors along the selected pipe segment, such as figure 2 As shown, the signal is collected through GPS synchronous timing, the processor sends the data to the server, and the mathematical model of the leakage signal in the frequency domain is established. The formula can be expressed as:

[0054]

[0055] where L(ω) represents the frequency domain signal of the leakage source, H k (ω,d) represents the frequency response function between the kth sensor and the leakage source, Indicates the variance of the background noise in the signal received by the kth sensor.

[0056] Step 2: Analyze the amplitude and phase information of the cross power spectral density of the signals collected by the two sets of vibration sensors, namely:

[0057]

[0058] in Indicates the amplitude, unit: W / Hz, φ(ω) indicates the phase.

[0059] Step 3: In the phase spectrum φ(ω) of the c...

Embodiment 2

[0075] The method for detecting pipeline leaks in this embodiment includes:

[0076] Step 1. Vibration sensors are arranged on the pipeline at predetermined intervals, and the mathematical model of the leakage signal in the frequency domain is established. The expression is:

[0077]

[0078] where L(ω) represents the frequency domain signal of the leakage source, H k (ω,d) represents the frequency response function between the kth sensor and the leakage source, Indicates the variance of the background noise in the signal received by the kth sensor.

[0079] Step 2 Analyze the interaction rate spectral density of signals collected by two adjacent groups of sensors the magnitude of With the phase φ(ω) information, in the phase spectrum φ(ω) of the cross power spectral density, find the non-dispersive frequency segment,

[0080] In this embodiment, if no non-dispersive frequency segment is found, there is no leakage point on the pipeline between two adjacent sensors. ...

Embodiment 3

[0087] Such as Figure 5 As shown, the pipeline leak detection system of this embodiment includes:

[0088] Sensors arranged on the pipeline at predetermined intervals.

[0089] The collected signal of the sensor is processed by the amplifier, analog / digital converter, and programmable controller in turn, and then output to the processor. The processor is electrically connected to the GPS unit. The processor is powered by a lithium battery. The processor is connected to the remote server and the client through wireless network communication. Mobile terminal, client PC terminal.

[0090] Processors include:

[0091] The non-dispersive frequency band determination unit is used to analyze the interaction rate spectral density of signals collected by adjacent two groups of sensors the magnitude of With the phase φ(ω) information, in the phase spectrum φ(ω) of the cross-power spectral density, find the non-dispersive frequency segment. The specific operation methods include: ...

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Abstract

The invention relates to a pipeline leakage detecting method and system, and the pipeline leakage detecting method and system are designed for improving the pipeline leakage detection precision. According to the pipeline leakage detecting method and system, the information of the amplitude S<x1x2>(omega) and the phase position phi (omega) of the cross power spectrum density, shown in the specification, of collection signals of two adjacent vibration sensors is analyzed. In the phase position spectrum phi (omega) of the cross power spectrum density, a non-frequency-dispersion frequency band issought, the difference value between derivative values corresponding to two adjacent data points is calculated and compared with the threshold value delta, and if the errors between adjacent values inthe continuous section shown in the specification are all smaller than the threshold value, the section shown in the specification is selected as the non-frequency-dispersion frequency band; and if the non-frequency-dispersion frequency band is found, a leakage point exists in a pipeline between the two adjacent sensors. The pipeline leakage detecting system is fixedly arranged on an undergroundpipe network, long-term pipeline health diagnosis, leakage detecting and positioning are achieved, the intelligent non-frequency-dispersion frequency band selecting technology is adopted, the manual selecting error is eliminated, the automation degree is high, and the detection efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of pipeline leakage detection, in particular to a pipeline leakage detection method and system. Background technique [0002] The underground pipe network is the necessary infrastructure to ensure people's life and economic construction, and has a global and leading influence on urban development. Leakage of pipelines caused by long-term burial, disrepair, and environmental corrosion is a persistent problem that plagues the pipeline transportation industry. my country's urban underground pipelines mostly use metal pipes, which have entered a stage of high incidence of accidents; secondly, there is a large demand space for plastic pipes dominated by polyvinyl chloride (PVC) and polyethylene (PE) in leak repair and replacement. However, the underground pipe network is intricate and complex, and it is difficult to accurately locate the leakage point. Therefore, in order to maintain the safe operation of urban undergrou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D5/06
CPCF17D5/06
Inventor 李新宏高艳王自明马一凡
Owner CHANGZHOU CHANGGONG ELECTRONICS TECH CO LTD