Method and system for measuring propagation speed of natural gas pipe leakage vibration wave

A natural gas pipeline and propagation velocity technology, which is applied in the field of measuring the propagation velocity of natural gas pipeline leakage vibration waves, and can solve the problems of poor anti-interference ability and the like

Active Publication Date: 2013-03-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this type of technology is affected by interference events around the pipeline when monitoring leakage, has a high system false alarm rate, and has poor anti-interference ability
As a dist...

Method used

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  • Method and system for measuring propagation speed of natural gas pipe leakage vibration wave
  • Method and system for measuring propagation speed of natural gas pipe leakage vibration wave
  • Method and system for measuring propagation speed of natural gas pipe leakage vibration wave

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Embodiment

[0038] Embodiment. The composition of the natural gas pipeline leakage monitoring system of optical fiber sensor used in this example sees figure 1 , it includes two parts: the optical system and the circuit; a fiber optic sensor is installed on the pipeline body at a certain distance, and a plurality of fiber optic sensors form a fiber sensor group, and each fiber sensor group is connected with an optical fiber and connected in series in the optical fiber After the beam splitter to the light source and photodetector at the receiving end, the output of the photodetector is connected to a signal acquisition and processing module including leakage signal identification and event location functions. The signal acquisition and processing module includes a signal conditioner, a signal collector, a processing Unit, terminal display and external interface; the output of the signal conditioner connected to the output of the photoelectric detector is connected in series with the signal ...

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Abstract

The invention discloses a method and system for measuring propagation speed of natural gas pipe leakage vibration wave. The method and the system are on the basis of an optical fiber sensed natural gas pipe leakage monitoring method. A natural gas pipe leakage monitoring system selects a known sensing unit point to simulate pipe leakage in the form of hitting a pipe to initiate vibration; according to the number of pipe sections used in project construction and inspection and acceptance data, leakage signals transmitted to two adjacent sensing units are subjected to time-delay estimation; leakage vibration wave speed is measured by combining known pipe length; the distances from the current test point to two adjacent sensing unit points are accurately obtained; a simulating test point X is substituted into the formula that X is equal to L-[v*(tn+2-tn)]/2 to inversely solute the formula that v is equal to 2(L-X)/(tn+2-tn); and the propagation speed of vibration wave along the pipe is measured according to the distance between known sensing units and detected signal transmitting time. The method and the system are high in sensitivity and accuracy, and low in false alarm rate and are not easily affected by environmental factors.

Description

technical field [0001] The invention relates to a method and a system for measuring the propagation velocity of a natural gas pipeline leakage vibration wave, and relates to the technical fields of mechanical vibration measurement, impact measurement and pipeline systems. Background technique [0002] At present, the total length of pipelines built in the world has reached 2.5 million kilometers, which has surpassed the total mileage of railways and has become the main mode of energy transportation in the world. Oil transportation in developed countries and oil-producing regions in the Middle East has all realized pipelines. my country's pipelines have also developed rapidly in recent years, with a total length of more than 70,000 kilometers. A large energy pipeline network has initially formed across the east, west, north and south, covering the whole country, and connecting overseas. Pipeline transportation has become the deployment of strategic energy such as oil and gas. ...

Claims

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Application Information

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IPC IPC(8): F17D5/02
Inventor 张金权王小军李东焦书浩王飞刘素杰赵锋郭戈杨文明李维
Owner BC P INC CHINA NAT PETROLEUM CORP
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