Research Of Soil Corrosion Evaluation Of Urban Gas Pipeline Based On ANN

With the accelerating pace of modernization of our country, the improvement of people's living standards and the increasingly outstanding global environmental problems, the pressure of energy-saving and environmental protection is more and more big. The explosive growth of natural gas demand is promoting the construction of urban gas network rapidly. Urban gas transmission and distribution system is usually constructed by buried steel pipe, so the corrosion and protection of steel pipeline has become problems to be solved. As one of the important factors—soil erosion is always concerned by researchers at home and abroad. But up to now, we havn't find a recognized and more realistic evaluation of soil corrosion.Based on the evaluation method of pre-scholars, this paper established the model of soil corrosion evaluation by ANN. This model has two important features:the first, it simplifies the testing samples parameters. It doesn't need a lot of soil physical and chemical properties, but only need combine some important individual index of soil pipe corrosion(soil resistivity, oxidation—reduction potential, salinity, water content, PH), we can create a new integrated model. The second, it increases the number of training samples. In order to improve the robustness of the model and the accuracy of the identification, the samples were expanded by generating 40 data sets randomly in each class standards.On the basis of new theory, this paper used BP and RBF network into corrosion survey of gas pipelines in Langfang. The application results show that the RBF network is better than BP network in the forecast accuracy to new samples. This method not only can be used for on-site assessment of soil corrosion of urban gas pipeline, but also provide a scientific basis for urban gas pipelines'maintenance and timely replacement.