The Research On Gas Pipeline Faults Recognition Based On Experiment And Simulation

In recent years, with the rapid development of the gas industry, the demand ofgas also increases ceaselessly. The pipeline is the main type of gas transportation.But the pipeline may probabely be affected when it is in operation, so its operationparameters will deviate from the normal operation condition.And if the deviationextent is large,the pipeline may probabely break down. When the pipeline operationconditions changed, the faults should be found and identified in time.And doingthese is positive for pipeline fauls location and faults clearing.This paper studies thegas pipeline faults recognition based on the combination of experiments andnumerical simulation method.First, this paper briefly introduces two main kinds of faults in gas pipeline andelaborates the reasons that lead to these faults. Then,the different changes of gaspressure and the flow rate are found when the gas pipeline has different faults,whichbased on the experimental study in the gas pipeline leakage detection test rig.Nextaccording to the experimental system and static pressure drop equation anaiyse thereasons that lead to this different changes in theory when the gas pipeline occurredthe two different faults.This paper also establishes the flow model of gas in pipeline based on thecomputational fluid dynamics theory.And the flow conditions of the pipeline aresimulated using of FLUENT software when the gas pipeline is in differentworking conditions.The different working conditions include normal condition,leakage condition and clogging condition.The results of the simulation point out thedifferent changes of the gas pressure, the changes of the gas velocity and thechanges of the gas density along the pipeline.And these differences provide atheoretical basis for gas pipeline faults recognition. Furthermore, simulation weremade on the different leak apertures and different blocking levels, the results showthat the larger apertures and higher degree of blockage leads to the more significantchange of the gas parameters in pipeline. Besides, the conclusions draw from theexperiment and the results draw from the simulation are compared and analyzed. Sothe foundation of gas pipeline fault recongnition is found based on the changes ofpressure and flow rate.This paper expounds the advantages of the pressure wave method for faultlocation, and according to the pressure wave fault location principle analysises themain factors that influnce the fault location accuracy.The result shows that the mainfactors that influnce the precision of faults location are gas velocity and pressure wave speed caused by the change of the gas pipeline pressure and temperature aswell as the determination of the time that pressure wave propagate in pipelinecaused by the noise reduction level of original signals.This paper studies the gas pipeline faults recognition.And the study also canprovide a technical support for engineering field of gas pipeline fault recognition.