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Engineers Australia: Surge Analysis of Piping Systems

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Original posting from Engineers Australia (no longer available on the web):

Pressure transients are also referred to as surge pressure or, if referring to water systems, water hammer. The latter term suitably reflects the harmful effects that the hammer-like blows accompanying the pressure surges can have on pipes and system components. These shock waves are caused by events such as the rapid acceleration or deceleration of a liquid flow and result not only high positive pressure but can also result in a severe negative pressure. The reason why surge pressure is so dangerous is that it travels at the almost undiminished speed of sound (roughly 1100 m/s for a large number of pipe materials) and can cause potential destruction in every part of the piping system it reaches. As it is often not possible to altogether avoid pressure transients when operating a piping system, the art lies in keeping the pressure transients within controllable limits. Ignoring the problem can lead to disaster and analysing for potential problems & correct solutions can be legally mandatory as specified by standards such as AS2885.

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Engineers Australia: Surge Analysis of Piping Systems