babangbangbang


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Old 03-04-06, 09:31 PM
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babangbangbang

hi everyone,
you know that noise the pipes make sometimes when the washing machine cuts off the water:

BABANGBANGBANG!

well, i know they sell those pressure absorber fittings that you can solder into the pipes by the washing machine. (what are those called again?)


well, my friend is having the same problem in his bathroom that i just helped him put together. he says it only happens with the cold water and only sometimes, but when he has the faucet on and then turns it off, he hears the pipes over in the shower go BABANGBANGBANG!

the hot and cold go to the sink, then faucet, then shower.

any ideas?
thanks,
max
 
  #2  
Old 03-04-06, 10:07 PM
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> (what are those called again?)

water hammer arrestors.


> any ideas?

He has water hammer. You didn't install water hammer arrestors.

Tell him not to turn the faucets off so fast.


That's what a washer machine does. It has electric valves and when they shut off, they shut off too fast.

It's like driving your car into your garage but not slowing down. Just hit the wall.
Common sense says that you should slow down first.
 
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Old 03-04-06, 11:11 PM
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can i install the water hammer arrestors before the sink?
those pipes are still accessable.
 
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Old 03-04-06, 11:18 PM
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Check for a loose washer (or other part) in the faucet, presumably on the cold side.
 
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Old 03-06-06, 11:05 AM
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Originally Posted by maxslomoff
can i install the water hammer arrestors before the sink?
Yes.

The problem has nothing to do with loose washers and everything to do with the sudden deceleration of water when the valves are close suddenly.

You can verify this by shutting the valves to just a trickle before shutting them completely off.

If a trickle makes more noise, it is trumpeting not hammering.
 
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Old 03-06-06, 01:19 PM
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Check the washers in the shut off valves feeding the washing machine.
As Steve posted # 4.

Loose washers, see the last post on this link.
http://forum.doityourself.com/showthread.php?t=250803
 
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Old 03-06-06, 11:10 PM
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Check the washers in the shut off valves feeding the washing machine.
This also has nothing to do with a washer machine.


The other point is that hammer arrestors help only if you have water hammer.
They can help to prevent loose washers.

But hammer arrestors do not solve problems with existing loose washers.

That's because trumpeting and hammering are two very different things.


If installer a hammer arrestor doesn't help, what you have is not hammer.
 

Last edited by bolide; 03-09-06 at 09:54 PM.
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Old 03-08-06, 09:45 AM
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But hammer arrestors do solve problems with existing loose washers.
So does tightening the washer.

Bolide, tell the truth: do you own a company that makes water hammer arresters?

If installer a hammer arrestor doesn't help, what you have is not hammer.
Many times I've come across a loud hammering noise that happens when water is running through a faucet. Usually when opening or closing it. When I take it apart, I find a loose or worn-out washer, replace it, and the noise goes away. A loose washer in a toilet fill valve will also make this noise; replacing the fill valve (or the washer in an FM400) fixes it there too.

If it isn't water hammer, what exactly is the term for this hammering noise that happens when you use water in a faucet with a loose washer? I think we're having semantic problems on this point. I've always called it water hammer, whether it's from a loose washer or high-pressure & shutting the faucet off quickly. It's a hammering sound, with water.
 
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Old 03-08-06, 10:38 AM
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Could also be pipes that are not secured properly. When a washing machine valve shuts off the water supply, it does so very quickly and can cause the pipe to jump and hit a wall or stud if not properly fastened down. Same with a sink or shower. People get cheap when plumbing and figure they don't need hold down clamps on the piping. 6 feet of dangling copper or plastic pipe in an enclosed space will jump around when the water is suddenly shut off.
Not saying it isn't water hammer or a bad washer,but, just another cause.
 
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Old 03-08-06, 02:14 PM
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> do you own a company that makes water hammer arresters?

If I do, why would I say that they won't help if the problem is a loose washer?


> a loud hammering noise that happens when water is running through a faucet.

Hammering occurs only at the time water flow is suddenly stopped.

Hammering does not occur while water is running or starting.


> When I take it apart, I find a loose or worn-out washer,

Then it was not hammering.


>If it isn't water hammer, what exactly is the term for this hammering noise
> that happens when you use water in a faucet with a loose washer?

You can call it vibrating or trumpeting.

Hammer is caused by inertia.
Trumpeting is called by a vibrating "reed" of some sort.


> I think we're having semantic problems on this point.

Yes.


> I've always called it water hammer, whether it's from a loose washer
> or high-pressure & shutting the faucet off quickly.
> It's a hammering sound, with water.

If a hammer arrestor won't arrest it, it's not hammer.
 
  #11  
Old 03-09-06, 08:59 PM
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If I do, why would I say that they won't help if the problem is a loose washer?
You say that they will in your post #7. Maybe it was a typo.

I think we're having semantic problems on this point.
Can't see any reason not to call it hammer.
 

Last edited by steve_gro; 03-10-06 at 08:05 PM.
  #12  
Old 03-09-06, 09:57 PM
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Maybe it was a typo.
So it was.

(It's better to refer to a post by its number since we aren't all in the same time zone.)
 
 

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