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calphalon 11-01-2012 06:29 PM

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!

AllanJ 11-01-2012 07:42 PM

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.)

Alan 11-01-2012 10:04 PM

"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.

calphalon 11-02-2012 08:53 AM

Quote:

Originally Posted by AllanJ (Post 1042702)
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?

Alan 11-02-2012 08:27 PM

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. :huh:

TheEplumber 11-02-2012 08:59 PM

Quote:

Originally Posted by Alan (Post 1043539)
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. :huh:

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

Alan 11-03-2012 11:24 AM

Quote:

Originally Posted by TheEplumber (Post 1043560)
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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