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Old 10-25-2009, 08:52 PM   #1
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Do water hammer arresters really work?

My washer is very rough on the water pipes, it has very rapid on/off solonoid that has no mercy for the piping. Every time it cycles all the pipes in the house shake and I'm afraid one of these days one will just rip loose and flood the whole basement.

I'm considering installing water hammer arresters near the taps for the washer. Do those really work well, an dis there any consideration when installing them?

I've never done any pipe soldering before, but I'm willing to learn.


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Old 10-25-2009, 08:55 PM   #2
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yes, they work. No, I do not know how to size them. Soldering is a piece of cake.


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Old 10-25-2009, 08:59 PM   #3
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Arrester Sizing Table
Use this table to determine how many fixture units you have,
choose the arrester with the corresponding fixture unit rating
C.W. means cold water line, H.W. means hot water line
FixtureType of
Supply ControlFixture UnitsPublicPrivateTotalC.W.H.W.TotalC.W.H.W.Water ClosetFlush Valve10101066-Water ClosetFlush Tank55-33-Pedestal UrinalFlush Valve1010----Stall or Wall UrinalFlush Valve55----Stall or Wall UrinalFlush Tank33----LavatoryFaucet21-1/21-1/2111BathtubFaucet42321-1/21-1/2Shower HeadMixing Valve423212Bathroom GroupFlush Valve Closet---883Bathroom GroupFlush Tank Closet---663Separate ShowerMixing Valve---212Service SinkFaucet333---Laundry Tubs (1-3)Faucet---333Combination FixtureFaucet---333
RULE 1: Branch Lines of 20 Feet or Less
The Hydra-Rester should be placed at the end of the branch line between the last two fixtures served as shown (below).
RULE 2: Branch Lines Over 20 Feet
An additional Hydra-Rester (Y) should be placed as shown (below). The additional unit should be placed at the midpoint of the run longer than 20 feet. The sum of the fixture unit ratings of units X and Y combined, should be equal to or greater than the demand of all branches.

A link

You can install the arrestor at the appliance also
John Wayne once said "Life is tough and it is even tougher if you are stupid"

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Last edited by Plumber101; 10-25-2009 at 09:04 PM.
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