On Oct 13, 8:38*am, "MLD" wrote:
"DerbyDad03" wrote in message

...





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?

My guess----You might be getting more than one bang because something is
really loose and has plenty of room to move around. *The fact that it
happens with either hot or cold suggests that it might be near the location
where the water first comes into the house. *This brings to mind this
thought, do you have any pressure regulating valves in the house? *Poor
valve response resulting in several shutting and opening cycles could cause
this symptom. *As we all know, water hammer can be a very destructive force.
MLD- Hide quoted text -

- Show quoted text -



Yes, there is a pressure regulating valve shortly after the meter. The
water enters the house, immediatley enters the meter and then into a
T. One side goes to a pipe that feeds the 2 outside hose bibs and the
other goes to the house. The regulator valavle is right after the T,
on the house side.

Now that you mentioned this, I haven't tested for the hammer using the
outside hoses bibs. I'm not sure what it will tell me one way or the
other, but it'll be one more piece of data.