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Thread: Water hammer
11-13-2012, 07:07 PM #27
LK is this tank in a basement?
I only ask because one time when I changed a water tank in a basement I closed an old stop and drain valve to isolate the water from draining back from upstairs. After the new tank was in I had the same issues.
Cutting out the old stop and drains and replacing them stopped the water hammer issue. I guess they have some kind of rubber washer in them that comes loose when disturbed after years of not being exercised.
11-13-2012, 09:15 PM #28
Going to try some of these suggestions this weekend. Hopefully with some results that will steer me in the right direction.
Thanks to all for your help. Lots of good suggestions
11-13-2012, 11:14 PM #29
Check the system pressure. If you are getting more than 75 psi from the water meter, you need to install a PRV, just like you would do on your hydronic closed loop systems. Except this one will limit the water pressure to the house to >75 psi. rather than 12 psi for hydronic. Too much pressure causes water hammer, as do improperly secured pipe and supports. You can get a cheapo pressure gauge that hooks up to a hose bib from the big box store or Ferguson, etc. that will read to 100psi. I would start there.
11-14-2012, 06:21 AM #30
Is it better to strap the pipes down nice and tight or just hold them in place?
11-14-2012, 09:06 PM #31
Too tight, especially on hot water piping, and you could get expansion noise. But that can be eliminated if you use straps that allow for thermal expansion. I have always secured them tightly, and allowed for expansion. Talon, when used on pex generally allows for expansion. many other plastic hangers (we are talking residential here, where it commercial, there I use cushion clamps on strut channels) are also suitable. Those copper and steel two hole clamps, when over tightened, tend to bind when too tight, causing noise during thermal expansion.
11-14-2012, 09:22 PM #32
11-14-2012, 09:25 PM #33
You might be surprised to find a PRV on the main line already and it is the cause of the problem, as was stated.
I had one that had similar diagnosis and I did find a failing/stuttering PRV on the main. had customer contact utility and not heard back.
11-14-2012, 09:30 PM #34
Just something to check.
I replaced my hot water tank. Same for same. But I moved it 3 ft closer to the outside basement wall. I then had water hammer after that. I have a 100 ft garden hose outside. I discovered that if I leave the outside faucet for the hose on I get water hammer. Turn off the faucet, noise goes away. I don't know what the science is, but that fixed it.ENJOY THE RIDE
11-15-2012, 06:55 AM #35
11-15-2012, 07:00 AM #36
11-15-2012, 07:47 AM #37Professional Member
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11-15-2012, 07:17 PM #38
11-15-2012, 10:04 PM #39