Leakage Rate Calculation Method And Tracer Leakage Location Technology Of Medium And Low Pressure Urban Gas Pipeline

With the rapid development of social economy and urban construction,gas pipe network has become an important infrastructure to ensure urban operation,and its coverage is also expanding.However,with the continuous increase of gas pipe network operation time,the long-term buried steel gas pipeline gradually enters the stage of frequent corrosion and gas leakage under the common influence of various factors such as soil natural corrosion and stray current corrosion.Through investigation,analysis and in-depth research,this paper has completed the following work and main achievements:(1)with TGNET software modeling for steady state and transient leakage rate,the calculation of leakage,and as a reference,and validated the holes on the accuracy of the model and the empirical formula calculation,suggest using in practical engineering software simulation to calculate flow rate and leakage,in case of special circumstances,pore model calculation formula used for estimates;At the same time,TGNET was used to simulate the time required for all the gases in the test pipeline to leak into the atmosphere,which provided guidance for the follow-up field verification.Neon(2)a used as the tracer gas leak detection methods,and USES the FLUENT software to simulate and study and obtained under alternating gas injection,the continuous gas injection way neon as tracer gas concentration distribution rules and the leakage diffusion regularity of buried pipeline,analyzes the different leakage rate,the influence of different buried depth on the leakage diffusion,the results show that,The detection effect of alternating gas injection is better,which provides a basis for the subsequent field test verification.(3)to develop a set of standard tracer detection process,according to the calculation of leakage,leakage rate and FLUENT simulation calculation results are further field test validation,through field test fitting method for secondary data analysis,and verifies the excavation,verify the neon as tracer gas leak detection accuracy.