Water Control Solutions

BERMAD Fire Protection

The NFPA 13, UL, FM and Manufacturer Requirements for Pressure Relief Valves Downstream of Installed Pressure Reducing Valves

The design of fire protection systems is a complicated process that requires an integrated approach and a high level of expertise. System designers and engineers need to take a large number of factors into account while also understanding and complying with stringent local, regional, and international standards. 

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Water surge or water hammer is a pressure wave in a piping system caused when a fluid in motion is forced to stop or change velocity or direction suddenly. Pressure surges in fire water systems can be caused by a number of different factors, such as a valve closing or opening too quickly or a pump starting or shutting down suddenly. This momentum change can create a significant and potentially damaging pressure rise.

Most fire protection systems are designed to operate at a maximum working pressure of 12 barg (175 psi).  Pressure waves from water hammer or pressure surge can easily exceed 50 barg (740 psi), thus creating a very real threat of damage to piping and instrumentation.

The pictures below show two examples of catastrophic damage to piping and accessories caused by water surge/water hammer in fire protection systems.

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Topics: Fire Protection, Water hammer in fire protection systems

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