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?

I just seen a water noise priblem on this old house, and the noise was
caused by the water pipes in the celler that was secured by metal
hangers to the 2by's, causeing the noice when the water came through
the pipes because the pipes expand rubbing against the rafters causing
the noise. I thought it might be a faucet washer which would cause
that ratte tat noise, but u said it happ-ens with everything. Is it
cold water only that makes a noise or hot or both?? henry P.S. If the
water pipes are mounted on the rafters u have to get the pipes away
from them, and the hardware selles a pipe connecter that fits over the
pipe and the bracket has 2 holes to nail to the rafter, thus keeping
the water pipes away from the rafters, good luck, henry