On Oct 13, 8:13�am, DerbyDad03 wrote:
I know about water hammer - the loud noise associated with a rapidly
closing valve causing the water to slam inside pipes causing them to
bang. I also know most of the solutions - arrestors, expansion tanks,
securing pipes, draining the pipes, etc.

The water hammer I'm experiencing is different.

� - Instead of a single loud bang, I get a rapid fire dull
thump-thump-thump almost like the rat-a-tat-tat-tat of a machine gun.
� - They happen when just about any faucet, toilet, shower, appliance,
etc. is turned ON or OFF.
� - When a device is turned ON, I'll get 4 or 5 rapid thumps lasting a
second or two.
� - When a device is turned OFF (even slowly turning off a faucet) I'll
get anywhere from 20 to 50 rapid thumps lasting 3 - 7 seconds.
� - It happens with both hot and cold water, single valve devices or
dual faucet fixtures.
� - It happens 85% - 90% percent of the time.
� - I have drained the system and refilled it. I thought it helped,
because it didn't happen for a few hours, then it started again. It may
have just been the 15% - 20% of the times when it doesn't happen.

Anybody heard of this type of water hammer?

if you have any valves to isolate bathrooms sinks etc try turning them
off to isolate the problem