[jmon]

Hey folks, question about water hammer arrester size. I have an outside faucet that is fed by a 3/4 in copper line directly off the main in the house. I set it up this way to bypass the softener and filter and have a high-flow outlet for filling our pool.

Well grass planting season is upon us and the timer I bought and put on this faucet is not soft close, it is a sudden slam, resulting in terrible water hammer. I happen to have on hand a 1/2" cash acme sweat-fit hammer arrester, and for some un-remembered reason I put a tee in the 3/4" line right before the pipe leaves the house. This tee has a 4" section of pipe then is capped and would be perfect for the hammer arrester, I even have a 3/4" to 1/2" adapter in my plumbing drawer.

I read something about "fixture units" and sizing these things but really just need to know if this will do the job and save myself a trip to the home despot. The model is CM500-SWA. House water presser regulator set to 65 psi (and tested). The run from the tee off the main to this faucet is about 20' with nothing else fed by it.

Imo, I think it would do the job fine.

I can tell you water hammer aresters work on washing machines, toilets, faucets, anywhere you have a water hammer issue.

You are in a residential not commercial setting, so I don't think you need all the mechanical engineering tables etc., for sizing.

The video shows a different way to quiet the irrigation system, no soldering required. But your way sounds like it would work as well.

Hope you can it quieted down soon ksguy.

 

[jmon]

Yeah I added them to the washing machine and under the kitchen sink since we have a motion-activated faucet that slams a valve shut. They work wonders. I just wasn't sure if this size would be up to the task. I feel like since I have it, and since it will only get seasonal usage since everything else that uses the spigot is soft-close, it will hold up fine for years.

No doubt the 3/4in would be better, being you have 3/4 in pipe, but you have nothing to loose to try. You have it all set-up and even though you will be using a reducer it may still work. Give it try and see if works. If not, you'll have to get the bigger one. Just a suggestion and my opinion only, others may disagree.

 

[jmon]

Lol. Looks great ksguy. Nice job.

Better than nothing at all, at least it helps some. The closer to the actual valve the better.

If any pipes seem loose, shake, etc., put a strap/support clamp with a cushion on them to cut down/dampen the noise.