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Water Hammer Considerations for Plastic Valves and Strainers

Water HammerA significant, nearly instantaneous pressure shockwave may be generated when a valve opens or closes too quickly, or when a pump starts with an empty discharge line or suddenly shuts down. This phenomenon is the result of the sudden change in velocity of the fluid flow in combination with the characteristics of the piping.

 

This shockwave is manifested by a series of hammer blow-like sounds, often referred to as water hammer, which may have sufficient magnitude to cause catastrophic failure within the piping system. To avoid water hammer conditions, consider the following:

 

The pressure rise created by water hammer is added to the nominal actual working pressure of the system. Please refer to Hayward's online water hammer calculator to help ensure all your system components are rated for the maximum pressures that might occur.