Engineered Water Hammer Arrestor

Solutions for Water Hammering

  • Water 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, a 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.
  • This pressure wave can cause major problems, from noise and vibration to pipe collapse.
  • A water hammer arrestor cures this condition with a cushion of air that absorbs the momentum. 
  • Sioux Chief Water Hammer Arrestors

    The term “water hammer” is used to describe the pressure surges, audible noise and destructive forces associated with the transfer of kinetic energy into the piping system due to an abrupt change in velocity of a non-compressible fluid.

    The two main factors necessary to create water hammer in a piping system are the initial speed (velocity) of the flowing water and an abrupt change to this flowing water velocity. When a water column is stopped abruptly, the momentum force in the flowing water (kinetic energy) quickly transforms into a pressure rise within the pipe.

    The most effective means of controlling water hammer is the installation of an engineered water hammer arrester. An engineered arrester employs a measured, compressible cushion of air or gas which is permanently separated from the water. When a valve closes abruptly, the moving water column is displaced up into the arrester, compressing the permanent air charge until all the momentum of the moving water is safely dissipated, allowing the column to slow down calmly, preventing the development of water hammer.