Urban Distribution Pipe Network Hydraulic Condition And Reliability Analysis

The function of city distribution pipe network lie to supply user adequate volume and required pressure during assigned time and under working conditions.Based on the radical formulae of gas pipeline, considered the most common used pipe network layout mode of city distribution network, in this article gas flow and gas distribution in the city distribution network are introduced, carefully Analysized the characteristic of pressure drop which accord with the practical situation of outflow pipeline, the scalar which the each gas source point offered in the network of much gas source points, and made some additional analysis to ring equation based on many datumAccording to the relation of flux and pressure in the gas pipeline formulae which suit for city distribution network, calculate the gas distribution in the network and pressure of user gas booster. From the comparison to design working condition and accident condition of city distribution network, considered to meet the need of user requirement, the outlet pressure of gas booster is adjusted to meet the requirement of pressure under the accident condition. What's more, while one or several pipes require definite pressure, the pressure of every node is calculated under such required pressure to ensure pipeline network failure-free operation.The paper researched the mechanical and hydraulic reliabilities, and made out the index and analysis ways to the pipeline and pipe-network accorded with the principle of mechanical reliabilities, introduced three indices which apprise the reliability on the pipe-network system to lake place the present incomprehensive binary valuation modal and used it to make the practical analysis.The paper, under the considering of the accidence work condition and the range of the pressure, on the basis of all the pipelines of of the pipe net normally working, gave the way how to meet the gas need of the consumers as large as possible, and provided necessary data for adjusting the input pressure of theconsumers.By the analysis calculation of the waterpower reliability, we can predict, under the accidence work condition, the degree of the gas meeting the need of the consumers at every time and every node,And afford the basis for macrostructure.