DYNAMIC PIPE FRACTURE IN WATER PIPELINE
In the case of sudden valve closure waterhammer creates the most powerful pressure and damage to pipeline systems. The best way to protect the pipeline system is to eliminate waterhammer. The main reasons of waterhammer occurrence are valve closing, initial velocity, and static pressure. However, it is not always so easy to eliminate waterhammer. More or less,waterhammer occurs when the valve is being closed. In this study the pipe fracture caused by static water pressure, gradually increased pressure, and suddenly increased pressure are compared experimentally in a breaking PVC test pipe. The classification of the quasi-static zone, the dynamic zone, and the impact zone are shown in the results of those experiments by considering the fracture patterns of test pipes and impulse. The results of the maximum pressure are used to design the pipeline even though it is in the dynamic zone. The impact zone is shown in this study, which is influenced by not only the dynamic characteristics of pipe materials but also by the acceleration term of the momentum equation.
fracture dynamic pipeline impulse acceleration PVC design waterhammer test strength
Kazumi Ishikawa Yukio Kono Akira Haga Kazuo Kato
Tohoku Gakuin Uniersity, 1-13-1 Chuo, Tagajo, Miyagi 985-8537, Japan
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
2134-2139
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）