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Plumbers Water hammer question

Old 11-22-2020, 01:46 PM
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Default Plumbers Water hammer question

First off what causes pipes to chatter in the first place when they are turned on. Had a renovation done where the shower and washing machine was causing a clunk in the pipes. Plumber came in and put a water hammer preventer or at least I think that's what its called. Do they wear out. The clunking is back. Thanks
Old 11-22-2020, 01:49 PM
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A hammer arrestor is just an air chamber. Installed correctly, and properly sized they don't wear out. Rarely they do blead all the air out and stop working. But that is rare.
Old 11-22-2020, 01:58 PM
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Originally Posted by EMC Pursuit View Post
A hammer arrestor is just an air chamber. Installed correctly, and properly sized they don't wear out. Rarely they do blead all the air out and stop working. But that is rare.

WRONG! An air chamber May work briefly but it’s not a hammer arrester. I am including a website where you can research water hammer, arrestors, and proper sizing. They work when properly installed.

www.siouxchief.com
Old 11-22-2020, 02:01 PM
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Originally Posted by Still Stoked View Post
WRONG! An air chamber May work briefly but it’s not a hammer arrester. I am including a website where you can research water hammer, arrestors, and proper sizing. They work when properly installed.

siouxchief.com
Technically your right, Its an air bladder chamber.
Old 11-22-2020, 02:06 PM
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^^^^^But air chambers aren’t reliable. Or long term. Do it right!

Been there MANY times. Research the Sioux Chief site. They developed the engineered hammer arrestor.

Read up and your concerns wil” be addressed!

Old 11-22-2020, 02:52 PM
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Stupid question but does the air chamber in a well tank act as a cushion for indoor plumbing as well.
Old 11-22-2020, 05:04 PM
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Originally Posted by Shag View Post
Stupid question but does the air chamber in a well tank act as a cushion for indoor plumbing as well.
Hey Shag,
So I've dealt with this problem for many years.
Water weighs about 9 pounds per gallon, when it run though a pipe and then stops abruptly its inertia wants it to keep going . In Many homes , especially older ones , the pipe straps loosen up and the pipe will slide within the strap and rattle or even boom, again when the water runs hard then stop suddenly. Usually noticeable when a dishwasher or washing machine fills and stops . ( because of the spring loaded inlet valves are abrupt ) But now with the fluid master type valves in most toilets , they too will create a water hammer.
In NYC, where I learned the trade, its code to put in air chambers on washing machines and flush o meters. ( which is a tee where the pipe goes from vertical to horizontal in the wall. The tee is 18 " high and capped.) This makes an air cushion that absorbs some of the shock.
Ideally the solution is to re strap all the piping. ( which is impossible w/o opening the walls) So What I do is strap everything you can get to I use pipe covering over pipe and then strap it down. I also install an ST-12 thermal expansion tank at the main valve or nearest to where you here the hammer noise.
An ST 12 is basically half air half water with a blatter in-between . Servers as an arrestor or a hammer suppressor . In houses where the toilet makes a hammer issue I install the old style ball cocks that close slowly .

Are you having this happen on Harkers Island?
Old 11-22-2020, 05:49 PM
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The tank at a well won’t affect water hammer. It’s at the wrong end of the water. As well, if using a cycle stop at your pump, you don’t have a tank anyway.

Ken is correct on the water heater expansion tank. You must remember heated water expands. I believe about 4%. It has to have someplace to go. It can no longer back up into the municipal water system, or past the check valve in a well. So you’ve got to have an expansion tank. Otherwise, your T&P valve will weep to relieve the pressure.

make sense?
Old 11-23-2020, 05:53 AM
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Originally Posted by alka2710 View Post
First off what causes pipes to chatter in the first place when they are turned on. Had a renovation done where the shower and washing machine was causing a clunk in the pipes. Plumber came in and put a water hammer preventer or at least I think that's what its called. Do they wear out. The clunking is back. Thanks
If the plumber added water hammer arrestors that solved your problems but now they are starting again. It is possible they have become water logged. Try turning the water to the house off and draining the faucets to allow them to drain and fill with air again.
Old 11-23-2020, 06:49 AM
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Originally Posted by Shag View Post
Stupid question but does the air chamber in a well tank act as a cushion for indoor plumbing as well.
not stupid but no. It is on the wrong end of the system. Water hammer is caused by the momentum of the water in the pipe being stopped suddenly. Now, a pressure tank at the far end of the system would help, but it would take 2 tanks, one for hot and cold.

My experience..air chambers do get waterlogged and fail to function. I've seen them freeze and fail.
Old 11-23-2020, 10:47 AM
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Originally Posted by bsmit24 View Post
If the plumber added water hammer arrestors that solved your problems but now they are starting again. It is possible they have become water logged. Try turning the water to the house off and draining the faucets to allow them to drain and fill with air again.
This is your solution...
Old 11-23-2020, 10:51 AM
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Old 11-23-2020, 01:52 PM
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Originally Posted by ken the plumber View Post

Are you having this happen on Harkers Island?
Nope, we are on city water here with no issues. We had an issue years ago back home but it was a waterlogged well tank. Went away when we put one in with an air bladder,
Old 11-23-2020, 06:50 PM
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Watch the video in post 12.

Re- read post 3.

You’re welcome!

Old 11-23-2020, 08:49 PM
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Do what post 14 says.

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