| we program simulation software with VC++, and carry out pipeline leak detection based on the simulation of hydraulic power transient of fluids. The simulation software has nice characteristic of versatility and expansibility.Firstly, we introduce the purpose of pipeline leak detection and leak detection method used both abroad and home at the present stage, analyses its relative merits and usable range, and come up with the main content of paper, i.e. carry out pipeline leak detection through hydraulic power emulation.Secondly, we establish transient mathematical model of fluids (usually, it is composed of motion equation, continuity equation and energy equation) based on flow behavior in pipeline and load it to the emulation analyses module. After that we take simulation results of steady-state model as initial condition and solve the model using characteristics method, so as to forecast hydraulic performance and equipment running status at all time and each detection point, meanwhile, show it as chart through computer. And then, we compare the pipeline theoretical working parameters including temperature, flow and pressure which are obtained through computer simulation to the real data which are collected by data collector attached to pipeline, if the difference exceeds scheduled threshold value which is the minimal leakage detected by system, then leakage take place.Finally, we design dialog box interface using for inputting pipeline and flow parameters and simulation software with VC++. The software could make dynamic hydraulic power emulation of long-distance pipeline and network system, simulate impact of factors such as on/off of valve and pump or compressor upon hydraulic power state of pipe system, and simulate the interaction of surge wave if leakage occurs at multiple-point. In addition, using simulation software we could detect pipeline leakage, not only detect the minuteness leakage, but also the leakage which have occurred. We could carry out not only single-point leakage detection and localization, but also the multiple-point leakage. The reason of high false alarm rate when carrying out pipeline leakage detection by using simulation software is also been analyzed. |
