Many projects of long-distance water transmission have been built to meet growing demand with adequate water quantity and quality.However,the constructed projects are paid more attention on the operation safety for the reason of single or double pipes transmitting water to cities as arteries.According to the user demand,it is essential to adjust flow of long-distance water transmission with gravity flow by the degree of plunger valve.The hydraulic status of the components in the projects,such as pipelines,plunger valves,air valves,pressure stabilizing tank are simulated by the numerical model with the theory of stable flow,and the status is analyzed by the rule of operation safety.There are three conditions for keeping the operation safety of long-distance water transmission in the stable flow.firstly,the water pressure along the pipelines is below pressure bearing capacity leading to pipes broken,secondly,the water pressure along the pipelines is higher than zero so as to avoid open channel flow,thirdly,the water pressure is higher than 3m water head on the position of air valve for preventing leakage by the seal.The method of simulating and analyzing hydraulic status has applied in the long-distance water transmission project located in the northeast of China,and the result shows that the method could ensure the security and order in the process of operation.
Operation Safety Long-distance Water Transmission Gravity Flow Hydraulic Model
JingYang Yu Chenguang Wu Yixing Yuan Xilong Bian Li Li Fang liu
Doctor, School of Municipal Engineering, Heilongjiang College of Construction, College Road, Limin D Associate professor, School of Municipal Engineering and Technology, Harbin Institute of Technology, Professor, State Key Lab of Urban Water Resource and Environment, Box 2624,the second campus, road H Professor, School of Civil Engineering and Technology, Heilongjiang College of Construction, College Master, School of Civil Engineering and Technology, Heilongjiang College of Construction; College Ro Mater, School of Civil Engineering and Technology, Heilongjiang College of Construction; College Roa