On Oct 13, 9:39*am, dpb wrote:
DerbyDad03 wrote:
On Oct 13, 8:33 am, wrote:
On Mon, 13 Oct 2008 08:13:10 -0400, 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?
Might be caused by the float valve in one of your toilets.- Hide quoted text -

- Show quoted text -

I'll isolate the toilets to see. Would this explain both ON and OFF
causing the noise?

Possibly if you have high pressure and a valve lifting slightly.

Is this a new or existing problem? *If new, have there been any
modifications to the system?

Do you have a pressure reducing valve?

Have you checked line pressure?

--- Hide quoted text -

- Show quoted text -

- New problem, started about a week ago.
- The last modification to the system was a replacement fill valve in
a toilet, but this was many months ago, with many months of no noise.
- Yes, I have a pressure reducing valve.
- No, I have not checked the pressure.

I think that isolating the toilets should be my first (and easiest!)
step.