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Surge Protection System

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Definition of Water Hammer(surge)

Water hammer (or, more generally, fluid hammer) is a pressure surge or wave caused when a fluid (usually a liquid but sometimes also a gas) in motion is forced to stop or change direction suddenly (momentum change). A water hammer commonly occurs when a valve closes suddenly at an end of a pipeline system, and a pressure wave propagates in the pipe. It is also called hydraulic shock. This pressure wave can cause major problems, from noise and vibration to pipe collapse. It is possible to reduce the effects of the water hammer pulses with accumulators, expansion tanks and other features.
· Normal operation
Normal operation_Fluid network analysis

· Formation and growth of vapor cavity
Formation and growth of vapor cavity_Fluid network analysis

· Water Hammer Phenomenon occur
Water Hammer Phenomenon occur_Fluid network analysis

· Pressure Change of Re-operation
Pressure Change of Re-operation_Fluid network analysis
Damage of Water Hammer

1) Raised pressure in the pipeline causes break of facilities such as pumps, valves, pipes, and supporting structures.
2) Vapor cavities causes collapse and heavy shock wave generated in the course of column separation and subsequent causes break of the pipeline.
3) Low pressure in water supply pipeline causes health risk by letting in pollutants from outside.
4) Water hammer may cause vibration and noise or make automatic control hard due to abnormal pressure wave.
hydraulic transient analysis_Fluid network analysis
Why hydraulic transient analysis is necessary?

1) Pressure extremes usually occur during a period of transient flow
2) Pressures may exceed design limits
3) Undesirable conditions occur(low pressures, cavitation, large pressure spikes, etc.)
4) High pressure transients break pipes
5) Low pressure transients destroy seals
6) Low pressure reansients may cause health risk
7) Evaluate surge protection schemes

hydraulic transient analysis_Fluid network analysis
hydraulic transient analysis_Fluid network analysis
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hydraulic transient analysis_Fluid network analysis

Fluid network analysis

Fluid network analysis

Pressurization system l Surge protection system l Pressure maintaining system l Corrosion monitoring l Leak detection system l Surge tank l Pressure holding system l Combined cycle power plant l Fluid network analysis