Is Water Hammer the resultant "Noise" from the shock of acceleration of water? If so, Water Hammer is nothing more than vibration.

Is there a point when Water Hammer is pressent and not detectable by the human ear? If so, would there be any damaging affect because of the seemingly small amout of Water Hammer?/Resilient Seated Gate Valves

Is there a method of measuring Water Hammer?

Its about as much like vibration as an earthquake is.  Water hammer is often not heard at all.  What is typically "heard" is the effect of a pipe moving into a support or slamming up against a wall, anchor point or other supporting structure, if not actally coming lose from its mountings, or breaking up a flange joint completely, if it was severe enough.  If the support structure was not there, the pipe might even have moved relatively silently, and probably moved a lot more.  The event triggering the high pressure transient in one place could have originated 20 miles or more away from the point of observation.  They are quite common on long pipelines with high fluid velocities that experience rapid +/- accelerations.

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