Abstract In fluid mechanics, the large pressure fluctuation caused by rapid change of flow in a closed pipeline is called water hammer. It has huge destructive power for pressurized pipelines, which often lead to leakage or even burst. this paper, through analysis dynamic characteristics gas pipeline, necessity setting air valve drawn. Then based on Bentley HAMMER model, combined with example r...

Original scientific paper First theoretical papers, summarizing the high mechanical energy cumulation when high-speed drops impact on the solid surface as a result of the water hammer effect, have been known since 1960’s. Heymann has demonstrated that pressure maximum during the impact of a spherical drop of a liquid is several times higher than the presupposed maximum for the classical waterha...