On Feb 13, 3:34*pm, "Tomsic" wrote:
"micky" wrote in message

...





On Sun, 12 Feb 2012 19:37:43 -0800, "Guv Bob"
wrote:

Howdy folks! * When the toilet shuts off, I hear a fairly loud water
hammer now. *Never had that happen before until recently and have not had
any plumbing work done.

Have you replaced your washing machine hoses with woven metal covered
hoses? * *That will cause it. *The totally rubber hoses can prevent
water hammer. * (Athough maybe the hammer I had mostly occurred when
the washing machine was running. *It's been 18 years and I forgot
this. *But the remedy may be the same. )

But unless you turn the water off every time you finish using the
wshing machine, you should replace the hoses. Otherwise they'll burst
after about 10 years.

I did a little net research and see that this could cause damage or leaks
in the piping, so I'll have to get on this one quick. *But before I jump
into it head first, I've gotten a lot of good advice here and thought the
great mind might have some tips.

A couple of questions -- since it just started, I'm wondering where the
air could have come from?

I think air is the remedy, not the cause. * Air is compressable, so
air in the system makes the water slow down gradually.

I've tried running the water in all the faucets high and low to try and
bleed it but don't see much difference.

I've read that it could be on the downstream or upstream side of the
valve - do you know any way to tell? *Sounds like there are different
things to try and I'd just as soon start with the most likely and easiest
ones first.

Some more info (pull up a chair, boys, LOL!!)... *the toilet, sink & tub
all tee into the same line within a couple of feet of each other, but only
the toilet hammers. * Also, in the other end of the house - about 30 feet
downstream of the toilet, the kitchen sink faucet hammers.

Welp, that's my story. *Any help or good guess much appreciated.

You can get water hammer arrestors at the hardware store. *The screw
on between the washing machine and the hoses, or the hoses and the
valves. * They have air chambers about 4 inches long, and they work.

When you installl these, put in the new hoses with stainless steel
woven covers. * *You may only need an arrestor on the cold water,
since that's the water your toilet uses. * I think for several years,
I only had one. *Maybe I still only have one.

Of course the washing machine has a valve that closes the hot water.
I use the washing machine a lot less than I flush the toilet, and I
don't remember if there is or was hammer from the hot water.

There may be something similar for the bathroom, but the washing
machine ones may work for the bathrooms too. .

Eventually the rubber bladder between the air and the water will
break, and then after a while, the air will disolve in the water and
there will be no air. *Then you will need another one. * Mine have
been working fine for about 18 years.

Bob

The water hammer arrestors are a good fix for the problem. *I've had one on
the cold water line near the main house valve for 9 years now with no
problems and no water hammer. *But, having said that and reading your
original post again, the likely culprit is the toilet water valve. *Since
you didn't change any plumbing when the hammer started, it has to come from
wear and tear or some kind of system change such as a change in line
pressure. *I'll vote for a worn toilet water valve that sets up an
oscillation in the tank.

Tomsic- Hide quoted text -

- Show quoted text -

"it has to come from wear and tear or some kind of system change
such as a change in line pressure."

....or the leaching out of the air in any air gaps that might exist.

Oft times, simply draining the system and then refilling it will put
the air back into the air gaps and the problem will go away for many
years.

Been there, done that.