Need some help with a weird problem.....!Background:We're in a campground (which we've been in for the past three months) in a 2016 Winnebago TT hooked up to the 'city' water supply. We haven't changed anything in the water supply set up....(other than the filter two months ago) and do not have a pressure regulator hooked up in line. (haven't needed one....campground water pressure is very stable)After flushing the toilet.....When we depress the foot pedal further to allow some water to build in the bowl, we get very loud 'hammering' sound from the rear (junction box, water inlet location)!None of the other water sources (kitchen sink, bathroom sink & shower) have the same problem....when flowing water, no hammering!Any suggestions would be appreciated!

Just get a water hammer arrester and put in the line the main water line. Had the same problem on my 5ver and that stopped the problem. Bought one off of Amazon that had shark bite fittings on both ends.....and cut the pex line in my storage compartment. Took about 5 minutes to install.

Don't know why one outlet would do it and not others, but a small bladder tank will stop it, or a hammer arrester ???

Search google for water hammer arrester... then select images... lots of photos on what a water hammer idea looks like...I bet one of those small size 2-Gallon Expansion Pressure Tank LOWES would work too...Roy Ken

I got the same deal on my commode. I think it is/may be a function of the valve in the commode.

Check for a broken clamp in the area of the noise allowing the pipe to float free. If it just started with no change in water pressure, I would suspect this.

Water 'Hammering' issue | Good Sam Community

Singleminded
Explorer
Mar 10, 2017
newman fulltimer wrote:
Get a water regulator the toilet is not designed for the water pressure going to it the valve will eventually fail

I have checked the Campground water pressure each month...hasn't varied by more than 4 psi from a norm of 45 psi.....but I will reinstall my P reg as a test! Thanks!
newman_fulltime
Explorer II
Mar 10, 2017
Singleminded wrote:
newman fulltimer wrote:
Get a water regulator the toilet is not designed for the water pressure going to it the valve will eventually fail

I have checked the Campground water pressure each month...hasn't varied by more than 4 psi from a norm of 45 psi.....but I will reinstall my P reg as a test! Thanks!

Its not only the pressure but the gallons per minute that can cause the hammering just a case of to much wster.As a test use your onboard pump and tank bet the problem goes away
naturist
Nomad
Mar 10, 2017
A "water hammer arrestor" ought to be really, really cheap. It is nothing more than a piece of capped pipe tee'd off to the side of the line in such a way as to contain a small air chamber that can absorb the shock of closing a valve in a flowing water line. For anyone needing one, buy the tee you need to install in whatever your water pipe is, an adapter to up the pipe diameter to 1 or 2 inches, a cap that size, and 2 feet of that size pipe. Should cost you less than $5 at Lowe's, HD, etc. Glue the cap on the pipe, glue on the tee, cut the line, and install with the pipe pointed up so the cap is on top. Bingo. Water hammer arrestor.
Old-Biscuit
Explorer III
Mar 10, 2017
Hammering happening AT toilet OR it is happening at city water connection?

At toilet..then too high of flow.

But if at city water connection.......check valve inside city water assembly is CHATTERING

45# pressure is NOT an issue.
Need to check flow per minute.
Get a 1 gallon jug (milk jug etc)
Measure time to fill to overflowing

Should be in the 3.5 gpm to 5 gpm
wa8yxm
Explorer III
Mar 10, 2017
The city water inlet can "Buzz" more than Hammer. I will stick with
Water flowing: you've turned on the water pump, check to insure it's off
Hammering at shut off.. See previous replies re: Arrestor

And the folks who commented on max pressure.. yes, a good regulator, not the cheap cylinderical type but a Valterra, Watts or Zurin 1/2 inch or larger (3/4 is a nice size, easy to adapt to garden hose fittings) at the park end of your hose.. Very good idea.
myredracer
Explorer II
Mar 11, 2017
newman fulltimer wrote:
Get a water regulator the toilet is not designed for the water pressure going to it the valve will eventually fail

Funny you say that. We discovered at the end of last season that our toilet valve leaks water into the bowl when the pressure gets low, like around 10 psi. The entire CG had gone low and we were lucky to catch it while in the TT otherwise could have done serious damage. Pressure went back up to normal and stopped leaking. Checked on the internet and found we're not alone. Installed a new valve kit and it leaked worse. :M Gotta figure it out soon before the season starts up again.

Agree on a regulator. Some have reported it as high as 200 psi. I have seen it as high as 140 psi so far. I run our Watts at 65 psi.
Singleminded
Explorer
Mar 12, 2017
I promised to update....Amazon did it's usual....received the water hammer arrester same day....!

In hindsight, I should have done this in two stages, but....I bled the water lines on the exterior shower unit andand installed the arrester.....Hammering is gone!

I did have some air spitting when I bled the cold water line, so I suspect that was the culprit....but still puzzled as to why none of the other water outlets caused hammering when flowing?

Another wonderful mystery of life!
Dave_H_M
Explorer II
Mar 12, 2017
i bet that air was more the culprit than you needing the gizmo.
My toilet acted the same as you described and i have an accumulator in the system.

Anyhow glad it is fixed and I now have something to check for the next time I am camping.
Gjac
Explorer III
Mar 14, 2017
Singleminded wrote:
I promised to update....Amazon did it's usual....received the water hammer arrester same day....!

In hindsight, I should have done this in two stages, but....I bled the water lines on the exterior shower unit andand installed the arrester.....Hammering is gone!

I did have some air spitting when I bled the cold water line, so I suspect that was the culprit....but still puzzled as to why none of the other water outlets caused hammering when flowing?

Another wonderful mystery of life!
My guess would be that when filling your toilet bowl after flushing you are barely pressing down to allow water to flow in. On your other faucets you probably open them normally. When ever I encountered hammering it always occurred at very low flows once faucets was opened up the hammering went away.

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