Pipe leakage detecting instrument, detecting device and detecting method based on dynamic low-frequency technology

Abstract

The invention discloses a kind of conduit leakage detecting instrument, a detecting device and the method which base on the dynamic low-frequency technology. The conduit leakage detecting instrument includes a dynamic pressure sensor; the detecting device includes a conduit leakage detecting instrument, a base station, a central control station, and a GPS locating instrument and the conduit leakage detecting instrument connects with the central control station though the base station and the base station and the central station set up a locating instrument; the detecting method includes the following steps: the central station sets up the dynamic adjustable measuring range of the conduit leakage detecting instrument according to the get dynamic pressure variety; the GPS locating instrument can gets the time of the conduit leakage acoustic wave arriving the delivery first station or the delivery last station's conduit leakage detecting instrument individually; it can get the location of conduit leakage by plus-minus the time told above then multiply the transmission speed of the acoustic wave in the medium. It improves the measurement precision of the smaller pressure variety by adopting the detecting instrument and the detecting device and the method of the invention also can separate the leakage acoustic signal so it can determine the location of conduit leakage correctly.

Description

technical field [0001] The invention relates to pipeline leakage detection technology, in particular to a pipeline leakage detector, detection device and detection method based on dynamic low-frequency technology. Background technique [0002] Oil and gas pipelines are composed of pipelines connecting pressurization stations, distribution stations, blending stations, heating stations and pigging stations. Measuring instruments such as flow transmitters, pressure transmitters, and temperature transmitters are used to detect pipeline leaks. The method for judging pipeline leakage disclosed in the earlier Chinese invention patent Nos. 9612100.1 and 99107241.3 is to install multiple measuring instruments such as flow transmitters, pressure transmitters, and temperature transmitters at each of the above-mentioned stations, and according to From the data collected by the plurality of measuring instruments, it is judged whether the pipeline is leaking. [0003] The document with ...

AI Technical Summary

Problems solved by technology

Since the accuracy of the output value is guaranteed under the static working state, that is, the response time is long, the accuracy of the pressure change under the dynamic working state, that is, the response time is short, especially for small pressure changes. inability to measure accurately

However, from the basic nature of pipeline leakage, it can be seen that pipeline leakage is an instantaneous dynamic change, not only the response time is short, but also the pressure change is very small, so the pressure transmitter in the prior art cannot convert a small transient pressure The instrument output at which the variation reaches the maximum affects the correct judgment of pipeline leakage and causes false alarms

[0008] Most of the pipeline leakage occurs at least a few kilometers away from the first station of transportation. Due to the attenuation of the acoustic signal during pipeline transmission, the output data of the pressure transmitter at the base station is attenuated relative to the output data of the pressure transmitter at the first station. Double reduction, so the existing technology uses a pressure transmitter to measure the pressure change, especially the small pressure change has a large error

[0009] In addition, the pressure transmitter only has the accuracy index of the absolute value of the measurement. Since there is no frequency index, the sound wave signal cannot be measured within the set allowable frequency range, so it is impossible to effectively distinguish the leakage sound wave signal, the station operation sound wave signal and the normal sound wave according to the frequency. Signal

Images