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Old 11-01-2012, 06:29 PM   #1
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Water Hammer Air Chamber - proximity to vent


Edit: I meant proximity to fixture, not vent!

I'm moving washer/sink to the other side of the room (about 3' away). I'm capping off the existing plumbing since it wont be used anymore, which will extend the current air chamber from about 18" to 6 feet tall.

The new plumbing fixtures will be about 15' away (in water-line length) from the air chamber - is that too far away to still serve it's purpose?

If the line was 8' away, would that make a difference?

Thanks!

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Old 11-01-2012, 07:42 PM   #2
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Water Hammer Air Chamber - proximity to vent


Lenghening the air chamber from 18 inches to 6 feet will reduce the effectiveness although not completely. When the plumbing system is turned on, water will rise about 3 feet into the 6 foot column. Then when the washing machine shuts off, the water has to make the 3 feet worth of water in the column bounce in order to absorb the shock.

Extending the water line an additional distance from the air chamber will rduce the effectiveness although not completely. The farther you extend, the more you reduce the effectiveness. When the washing machine shuts off, the incoming water upstream of the air column will bounce harmlessly against the air column but the last 8 feet to 15 feet worth of water, between the air column and the washing machine, has nothing to cushion the shock.

Can you install a new air chamber within a foot or two of the new washing machine location? (The old air chamber can stay there.)

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Last edited by AllanJ; 11-01-2012 at 07:47 PM.
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Old 11-01-2012, 10:04 PM   #3
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Water Hammer Air Chamber - proximity to vent


"Water hammer arrestors SHALL be installed as close to the quick acting valves as possible"


I may be wrong, but i'm pretty certain that's what it says.
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Old 11-02-2012, 08:53 AM   #4
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Water Hammer Air Chamber - proximity to vent


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Originally Posted by AllanJ View Post
Can you install a new air chamber within a foot or two of the new washing machine location? (The old air chamber can stay there.)

I can, I just wasn't sure if I needed to. I will probably remove the old air chamber, as it is a bit in the way of other things. Here is what I was going to put under the sink (the sink and washer are coming off the same pipe)

http://www.amazon.com/Mini-rester-Wa.../dp/B000JRCFHK

Should that do the trick?
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Old 11-02-2012, 08:27 PM   #5
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Water Hammer Air Chamber - proximity to vent


I'm not really sure why that one is built that way.


Typically the arrestor is installed at the end of a line where it changes direction, so that when the water is stopped, it can continue straight into the arrestor.



For example :
< To appliance/faucet/fixture
. |
. |
--------| = = = Arrestor

^incoming line


I hope that makes sense.
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Old 11-02-2012, 08:59 PM   #6
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Water Hammer Air Chamber - proximity to vent


Quote:
Originally Posted by Alan View Post
I'm not really sure why that one is built that way.


Typically the arrestor is installed at the end of a line where it changes direction, so that when the water is stopped, it can continue straight into the arrestor.



For example :
< To appliance/faucet/fixture
. |
. |
--------| = = = Arrestor

^incoming line


I hope that makes sense.
I don't get you drawing but I've always installed arrestors in the vertical. Such as a 2" line feeding multiple WC and urinals -arrestors between the last 2 fixtures
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Old 11-03-2012, 11:24 AM   #7
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Water Hammer Air Chamber - proximity to vent


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I don't get you drawing but I've always installed arrestors in the vertical. Such as a 2" line feeding multiple WC and urinals -arrestors between the last 2 fixtures
Yeah, the drawing is screwed up.


Picture an angle stop at the wall, and the arrestor installed where the handle would be. That way when the water is shut off, the shock is absorbed in the direction of flow.

One of the arrestors I installed had a diagram on it showing that this was the correct way to install it. Can't remember which brand, and I can't find a diagram like it now. (go figure)

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