塩化ビニル管の準静的、動的破壊による強度の変化について(対流・拡散・渦・波動波動(4),一般講演)

概要

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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 are shown in the results of those experiments by considering the fracture patterns of test pipes. The results of the maximum pressure are used to design the pipeline even though it is in the dynamic zone.
2009-09-02