Study of Failure Rate Model for a Large-scale Water Supply Network in Southern China Based on Different Diameters

摘要

By thorough analysis of the data of pipe leaks and bursts from 2002 to 2011 of water supply network in a typical southern city of China, we find that the pipe's diameter has a close relationship with the failure rate of pipelines and established the failure rate model equations for pipelines of DN50～DN300 and DN400～DN1200 respectively. The models show there is a negative correlation between the failure rate and diameter when the pipe diameter is less than 1000 mm, while the failure rate is rising when the pipe diameter is greater than 1000 mm. So the pipeline with diameter as 1000 mm has the lowest failure rate value. Moreover, the analysis of wall thickness, burial depth, pipe material and other factors related to the diameter of pipe were taken, in order to figure out the reasons of leaking and bursting of pipe. And the roles of the models in daily management of pipeline network and optimal design were further discussed.