A Simple Method of Selecting Parameters of the Air Chamber to Suppress Oil Hammer in the Pipeline with Constant Upstream Pressure

Valvesw hich are connectedt o long pipelines in a large hydraulic system are occasionally closed very rapidly owing to unavoidable circumstances. The instantaneous stoppage of the flow in the pipeline causes the oil hammer phenomenon resulting in pressure rise which must be properly suppressed from the viewpoint of safety of the pipeline system.In this research, suppression of the oil hammer due to the instantaneous valve closure at the downstream end of the hydraulic line is considered and for this purpose the accumulator and its entrance choke are installed at the upstream side of the valve. The suppressing method are analyzed experimentally and theoretically to get the optimum value of the parameters of the accumulator and its choke. The simples traightforward procedure to determine the optimum parameters are established and its effectiveness are confirmed by the additional experiment.