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Water Hammer

Old 01-08-2016, 09:02 AM
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I've lived in the house for over 10 years and the hammer recently started showing up. If someone is in the upstairs kids shower and you turn off the water in the kitchen sink too quick it develops a resonance until you open up the sink again and shut if off slower. It'll bang at a frequency of about 5 to 10 hits per second until you stop it.

I plan to get a hammer arrestor and install (tips always appreciated), but what bothers me is why after all this time is it showing up now? I'll verify this weekend but don't remember seeing one in the system that could have gone bad.
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Old 01-08-2016, 09:15 AM
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If it is just starting then it may already have arrestors they are water logged. Try turning off the water to the house and draining all the faucets, then close all of the faucets and turn the water back on.
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Old 01-08-2016, 09:35 AM
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Siox Chief !


http://www.siouxchief.com/products/s...mers/arresters
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Old 01-08-2016, 09:44 AM
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Good idea bsmit....will be trying that this weekend. I'll also be rooting around to see if I can find any that are exposed.

Thanks!
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Old 01-08-2016, 03:11 PM
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Originally Posted by bsmit24 View Post
If it is just starting then it may already have arrestors they are water logged. Try turning off the water to the house and draining all the faucets, then close all of the faucets and turn the water back on.
This! The air chambers have gotten waterlogged.
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Old 01-08-2016, 03:21 PM
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My heat starting doing this once the bladder on the expansion tank failed. In addition, it started leaking water from the blowoff valve. When the boiler kicked in and raised the temp, , pressure would increase, resulting in the blowoff valve releasing pressure and dumping water. When it cooled back down, the pressure would drop and more water would be let in to get the pressure back up.

While the fresh water supply doesn't need an expansion tank, failure of an arrestor would have a similar effect I presume.
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Old 01-08-2016, 03:27 PM
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Do you have a pressure regulator? If so it may have failed and is allowing unsafe pressures, which in turn would result in water hammer. You can by a cheap gauge to check. It should be less than 80 psi.
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Old 01-08-2016, 04:07 PM
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Thanks for the suggestions. Came home tonight and turned the water off to the house and allowed all of the fixtures to drain. Turned water back on and bled the air off as slow as I could. Just tested it and everything seems good. The real test will be in the AM when one of the kids is in the shower (I think I simulated it right, but you never know).

Thanks
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Old 01-08-2016, 04:39 PM
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Originally Posted by bsmit24 View Post
If it is just starting then it may already have arrestors they are water logged. Try turning off the water to the house and draining all the faucets, then close all of the faucets and turn the water back on.
This would have been my answer. Over time the air in the arrestors is adsorbed into the water. I would also check the water pressure to see if your regulator has failed allowing the water pressure to be too high.
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