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#3369296 - 05/12/14 10:45 AM Water Hammer Arrestor
GGorman04 Offline

Registered: 11/27/11
Posts: 400
Loc: pennsylvania
I installed a water hammer arrestor on the washing machine due to excessive noise and it has not worked. Would the next step be putting on a pressure regulator?
Thanks in advance

#3369312 - 05/12/14 11:21 AM Re: Water Hammer Arrestor [Re: GGorman04]
doitmyself Offline

Registered: 06/03/02
Posts: 5589
Loc: MI
I have no personal experience, but this page seems to cover the basics:

Looks like your answer lies with: adequate arrestor type and size, pipe support/hangers, and pressure.

#3369313 - 05/12/14 11:21 AM Re: Water Hammer Arrestor [Re: GGorman04]
ARCOgraphite Online   content

Registered: 05/17/09
Posts: 10512
Loc: N.H, U.S.A.
Did you try putting a 1ft air-spring riser on the offending valve? Ive never seen or purchased a "ready made" water hammer arrestor - just made my own, as its just a piece of pipe.
What is your high-end water pressure? I keep mine under 55psig as I have an old drilled well pump. Street water?

Edited by ARCOgraphite (05/12/14 11:26 AM)
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#3369342 - 05/12/14 11:47 AM Re: Water Hammer Arrestor [Re: GGorman04]
Rand Online   content

Registered: 08/20/03
Posts: 11297
Loc: NE,Ohio
pictures of the install?, model installed, information on your water psi and type of system?(city/well etc)
2017 Jeep Cherokee Trailhawk V6

#3369388 - 05/12/14 12:36 PM Re: Water Hammer Arrestor [Re: GGorman04]
JTK Offline

Registered: 08/14/03
Posts: 9203
Loc: Buffalo, NY
What type of washing machine just out of curiosity. I know our LG front loader cycles the water on/off/on/off at various times in the cycle and those darn solenoid valves pop open/shut instantly causing a surge no matter what I've done.

Had this particular washer in two homes now. Same in both homes. Psssss.... BANG!! Pssssss.....BANG!
2016 Subaru Forester 2.5, CVT. 2013 Dodge Grand Caravan SE (Babe magnet III)

#3369398 - 05/12/14 12:48 PM Re: Water Hammer Arrestor [Re: GGorman04]
pcoxe Offline

Registered: 05/14/07
Posts: 405
Loc: South Carolina
Moving water has mass. When a valve shuts off abruptly, the moving column of water has to dissipate its kinetic energy somewhere, in this case, transferring it to the piping. Vertical standpipes filled with air act as shock absorbers to absorb some of this energy. The bigger they are the better they work. The more the better too as they can have a collective effect if they are on the same line.

#3369598 - 05/12/14 04:16 PM Re: Water Hammer Arrestor [Re: GGorman04]
GGorman04 Offline

Registered: 11/27/11
Posts: 400
Loc: pennsylvania

It is a Kenmore elite supplied by city water.
Not sure about psi because I do not have a pressure regulator

#3369604 - 05/12/14 04:25 PM Re: Water Hammer Arrestor [Re: GGorman04]
Quest Offline

Registered: 12/19/04
Posts: 7357
Loc: beaver land EH?
@ GGorman:

I think you have installed the water hammer arrester wrong way around.

Take a look at this pic (from Amazon, allows you to magnify:

In short: your connection to the washing machine's end should be connecting to the water-source, whereas the steel braided line part of your picture should be the outlet (connects to the washing machine).

Try it.

"Internet discussion boards act as echo chambers for conspiracy dittoheads" A.Allen

#3369638 - 05/12/14 04:57 PM Re: Water Hammer Arrestor [Re: Quest]
Stelth Offline

Registered: 02/24/11
Posts: 1901
Loc: California
The two main causes of water hammer are excessive pressure and improper strapping of the pipe. If you've noticed no difference since you installed these hammer arrestors, you should check your water pressure next. You can get a pressure gauge at home improvement stores that will screw on to a hose bibb. Anything over 80 psig is considered excessive. As suggested already in this thread, water pressure of 50-60 psig is much more reasonable.
Experts are often wrong, but rarely in doubt.

#3369687 - 05/12/14 06:06 PM Re: Water Hammer Arrestor [Re: GGorman04]
GGorman04 Offline

Registered: 11/27/11
Posts: 400
Loc: pennsylvania
I will try this when I get home. I thought I installed it correctly but will take a look.

#3369702 - 05/12/14 06:25 PM Re: Water Hammer Arrestor [Re: GGorman04]
DBMaster Online   content

Registered: 09/18/12
Posts: 4528
Loc: Greg Abbott Land
I am no plumber, but have done lots of plumbing work as an amateur. Have you thought about closing the supply valves partially to see if reducing pressure to the washer helps? The pressure to the washer ought to be quite adjustable and I don't think there is any law stating that the supply valves have to be fully open.

#3369708 - 05/12/14 06:28 PM Re: Water Hammer Arrestor [Re: GGorman04]
morris Offline

Registered: 08/24/08
Posts: 3681
Loc: ks, wichita
what you are doing is fine. i had the same thing once. did the air accumulator but didnt help. found out the valve in the dish washer was bad.

#3369884 - 05/12/14 09:44 PM Re: Water Hammer Arrestor [Re: GGorman04]
tom slick Offline

Registered: 05/26/03
Posts: 9082
Loc: Central Coast, Calif.
Originally Posted By: GGorman04
I will try this when I get home. I thought I installed it correctly but will take a look.

I think he means the hammer arrestor should be installed on the stop (before the hose) and not on the washing machine (after the hose) according to the picture.
I'm not sure it would make a difference but it's worth a try.
You get what you pay for...
So keep in mind how much you paid for this advice.

#3370505 - 05/13/14 01:56 PM Re: Water Hammer Arrestor [Re: GGorman04]
Touring5 Offline

Registered: 09/24/05
Posts: 470
Loc: Indiana
Those are pretty "stubby". When we hooked up to city water I put Sioux Chief arresters on the supply lines to the washer and dish washer - stopped all hints of water hammer. The Sioux Chief ones are probably about 4 inches long.

Never argue with a fool - people might
not know the difference.

#3370556 - 05/13/14 03:09 PM Re: Water Hammer Arrestor [Re: GGorman04]
GGorman04 Offline

Registered: 11/27/11
Posts: 400
Loc: pennsylvania
When I went to home depot they were the only ones for sale. Not sure if it will make a difference, but I will try and install them the correct way and see if that works.

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