Webinar on : Modeling and Simulation of Water Hammer & Surge Protection Systems
14th September 2017, 10.00 am -11.30 am, Indian Time
DHIO Research and Engineering Pvt Ltd.,
Water hammer (or, more generally, fluid hammer) is a pressure surge or wave resulting when a fluid (usually a liquid but sometimes also a gas) in motion is forced to stop or change direction suddenly (momentum change). Water hammer commonly occurs when a valve is closed suddenly at an end of a pipeline system, and a pressure wave propagates in the pipe.
On the other hand, when a valve in a pipe is closed, the water downstream of the valve will attempt to continue flowing, creating a low-pressure vapour bubble that may cause the pipe to collapse or implode. This phenomenon is known as column separation cavitation. This problem can be particularly acute where a pipe changes from vertical or uphill slope to horizontal. When the horizontal water column returns and the cavitation bubble collapses, this causes a severe local over-pressurisation, which may rupture the pipe. The occurrence and location of a low pressure cavitation event can be estimated beforehand using a system simulation code such as Flownex.