where to fit water hammer arrestor?

Reply

  #1  
Old 11-17-06, 02:54 AM
Member
Thread Starter
Join Date: Feb 2005
Posts: 72
where to fit water hammer arrestor?

where abouts in or around your house do you fit a water hammer arrestor?
 
Sponsored Links
  #2  
Old 11-17-06, 08:51 AM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
One posting I read mentions to install in closest to the source of the problem. Where did you buy your arrestor? Can I find one in HD? I have the same problem at home.
 
  #3  
Old 11-17-06, 08:59 AM
Group Moderator
Join Date: Oct 2004
Location: WI/MN
Posts: 19,251
Upvotes Received: 37
Best to put it on the line where the problem is occurring. Washing machines are common culprits.
 
  #4  
Old 11-18-06, 03:52 AM
Member
Thread Starter
Join Date: Feb 2005
Posts: 72
oh, crap, mine are on every tap, does that mean i have to get more than one??
 
  #5  
Old 11-20-06, 06:42 AM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
mine occurs when drawing hot or cold anywhere around the house although the source of the water hammer seems to be on one particular section of pipes in the basement. I bought a pair of arresters and will probably get them installed around that area.
 
  #6  
Old 11-20-06, 11:27 AM
Member
Join Date: Jun 2004
Location: us
Posts: 385
Water hammer is caused by fast acting valves, washing machines and toilets. If ever valve has a problem, I would start off looking else where. Otherwise your just treating the symptoms, rather than finding a cure. I would start by checking the water pressure.
 
  #7  
Old 11-20-06, 01:44 PM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
Mine seems to happen every time the toilet is flushed (when the tank fills up), the dishwasher is running or the faucet in the kitchen sink is used. Wouldn't the source be in the pipe rather than the valves?
 
  #8  
Old 11-20-06, 02:59 PM
Group Moderator
Join Date: Oct 2004
Location: WI/MN
Posts: 19,251
Upvotes Received: 37
Depends how you define source. The source of the noise is the pipes, but the reason it's happening is the valve. The closer the arrestor is to the valve causing the problem, the better it will work.
 
  #9  
Old 11-21-06, 11:10 AM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
Thanks. I'm unable to get near the toilet since that's been drywalled. I may end up installing the arrestor under the tank. I might be able to install one between the dishwasher and the kitchen sink.

I take it they have to be installed vertical? I noticed a cutaway view of the device shows it has an air chamber with o-rings. When they get waterlogged and I drain the line, will the water come out of the chamber or is the arrester toast?
 
  #10  
Old 11-21-06, 11:29 AM
Group Moderator
Join Date: Oct 2004
Location: WI/MN
Posts: 19,251
Upvotes Received: 37
Yes. They do make arrestors that don't have this problem, but I've only seen them on This Old House, not at Menards (where I just happened to have looked yesterday).
 
  #11  
Old 11-21-06, 07:31 PM
Member
Join Date: Nov 2005
Posts: 249
Before you install arrestors fix the problems. If you have a bad valve the arrestor is just a band-aid fix.
 
  #12  
Old 11-22-06, 08:01 AM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
I'm a bit confused as to what you meant by fixing the problem (bad valve). My toilet tank, lavatory, dishwasher and kitchen faucet seems to be working fine, but they also all cause the pipes to make loud clicking sounds when the valves (hot or cold) are shut.

What can I do to fix the situation?

Thanks.
 
  #13  
Old 11-22-06, 10:41 AM
Group Moderator
Join Date: Oct 2004
Location: WI/MN
Posts: 19,251
Upvotes Received: 37
Water hammering is typically created by valves that close quickly, not bad valves, so I don't understand that post either.
 
  #14  
Old 12-22-06, 07:48 AM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
Here's an update on my water hammer problem. Because I noticed it happens to most of my bathroom and kitchen fixtures, I asked my plumber to check the water pressure. It was at 85 psi! I didn't have a regulator installed so I asked him to do it for me.

It's now set at 45 psi and seems to have eliminated all issues; but created a new one.

When I have more than 1 fixture in use, e.g. toilet flushing and faucet open, there's a rattling sound coming from the pipe between the water meter and the regulator. They are about 2 linear feet apart at right angles. The sound is continous and heard throughout the house. When I showered upstairs it sounds like a jack hammer is pounding away in the basement.

I've notifed the plumber and he's not sure what's causing it and how to solve it.

Any ideas out there? Will a water hammer arrester work for this case?

Thanks.
 
  #15  
Old 12-22-06, 11:17 AM
Member
Join Date: Jun 2005
Location: USA
Posts: 107
Originally Posted by Homebrewer View Post
Here's an update on my water hammer problem. Because I noticed it happens to most of my bathroom and kitchen fixtures, I asked my plumber to check the water pressure. It was at 85 psi! I didn't have a regulator installed so I asked him to do it for me.

It's now set at 45 psi and seems to have eliminated all issues; but created a new one.

When I have more than 1 fixture in use, e.g. toilet flushing and faucet open, there's a rattling sound coming from the pipe between the water meter and the regulator. They are about 2 linear feet apart at right angles. The sound is continous and heard throughout the house. When I showered upstairs it sounds like a jack hammer is pounding away in the basement.

I've notifed the plumber and he's not sure what's causing it and how to solve it.

Any ideas out there? Will a water hammer arrester work for this case?

Thanks.

Most regulators are adjustable, so before doing anything drastic again, adjust the regulator a bit to adjust the psi up a little, perhaps to 50-60 psi and see if that helps.
 
  #16  
Old 12-22-06, 11:38 AM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
Thanks. Yes, this one is and has a built-in gauge so I'll try that. I wasn't there when the plubmer installed it but he told the wifey to expect water to come out of the valve if I adjust the pressure. Is that normal?

I failed to add that when it jackhammers, it also causes water to dribble out of the valve.
 
  #17  
Old 12-24-06, 01:36 PM
Join Date: Aug 2006
Location: usa
Posts: 902
banging

Do you have a pressure reducing valve on the house? Any valve that will prevent backflow to the supply (well tank, street) will cause the pipes to bang. A valve closing sets up shock waves in the pipes. A bladder in a well tank for instance will absorb those shocks. You probably have some sort of valve in line with your water source for this problem. As far as I know, the piston shock absorbers can be mounted in any position. Follow the manufacturer's directions, or check their website.

Pete
 
  #18  
Old 12-29-06, 11:39 AM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
By "pressure reducing valve" are you referring to a regulator? Yes that was installed and while it eliminated all the banging in most of my fixtures, it did create a new one which I described previously.

Prior to adjusting the regulator, I checked for the source of the leak and noticed water was coming out of a pinhole purge valve by the side. The leak would stop after a while so I placed a pail underneath overnight. Bad move. Sometime in the evening, the leak must have started again and by daybreak, it had overflowed and caused water to accumulate in some areas of my basement. Good thing the floor drain took most of it away.

The plumber has since removed the regulator and I am back to 85psi until he comes back after the holidays with a new regulator.



Originally Posted by radioconnection View Post
Do you have a pressure reducing valve on the house? Any valve that will prevent backflow to the supply (well tank, street) will cause the pipes to bang. A valve closing sets up shock waves in the pipes. A bladder in a well tank for instance will absorb those shocks. You probably have some sort of valve in line with your water source for this problem. As far as I know, the piston shock absorbers can be mounted in any position. Follow the manufacturer's directions, or check their website.

Pete
 
  #19  
Old 12-30-06, 11:14 AM
Join Date: Aug 2006
Location: usa
Posts: 902
hammer placement

Originally Posted by TheMechanic View Post
where abouts in or around your house do you fit a water hammer arrestor?
http://www.siouxchief.com/B_WaterHammer_FAQ.cfm
http://www.pdionline.org/PDI-wh%20201-2006.pdf
 
  #20  
Old 12-30-06, 12:21 PM
Join Date: Aug 2006
Location: usa
Posts: 902
Regulator

"By "pressure reducing valve" are you referring to a regulator? Yes that was installed and while it eliminated all the banging in most of my fixtures, it did create a new one which I described previously."


Yes, they're often installed with a check valve that will prevent water from being able to flow back into the municipal supply--a concern if the municipal water system pressure should fail from mains break, etc. Unfortunately, these also prevent the waves from dissipating back towards the supply... The regulator will reduce water hammer, but if you're still experiencing banging at 60 psi you should consider some sort of arrestor to eliminate it completely.

Peter
 
  #21  
Old 01-01-07, 04:06 PM
Member
Join Date: Jan 2007
Location: Middlesex County, CT.
Posts: 8
hammer arrestor location.

Install it as close as possible to the offending valve that causes the water hammer. What is your water pressure? Is the pipe properly secured? Is the pipe properly sized?
 
  #22  
Old 01-02-07, 10:44 AM
Member
Join Date: May 2006
Location: Toronto
Posts: 127
Water hammer is occuring on almost every fixture in the house. I have a 3/4" in. main line and branching out to 1/2". There is 85 psi on the line so I have no choice but to install a regulator. The old one leaked at the pressure release valve so I'm waiting for the plumber to come back with another regulator.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes