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Old 03-05-2013, 09:44 PM   #1
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Water hammer noise and sprinkler


Replaced some old galvanized pipe with copper in master bath. Intent is to do the whole house.

Turned the sprinklers on and now 2 of the valves cause a water hammer noise not heard before.

Any thoughts?

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Old 03-05-2013, 09:52 PM   #2
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Water hammer noise and sprinkler


Maybe new copper pipe is reacting with old galvanized pipe and creating higher pressure causing water hammer. Probably a couple water hammer arresters should quiet it down. Just a thought.

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Old 03-05-2013, 09:54 PM   #3
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Water hammer noise and sprinkler


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Maybe new copper pipe is reacting with old galvanized pipe and creating higher pressure causing water hammer. Probably a couple water hammer arresters should quiet it down. Just a thought.

Placement LOCATION?
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Old 03-05-2013, 10:00 PM   #4
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Water hammer noise and sprinkler


do u hear it all the time? Or just when turning on and off?
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Old 03-05-2013, 10:04 PM   #5
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Water hammer noise and sprinkler


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do u hear it all the time? Or just when turning on and off?

ON OFF and only 2 valves located in backyard, which is close to this bathroom.
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Old 03-05-2013, 10:06 PM   #6
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Water hammer noise and sprinkler


DP, this maybe a helpful link for you, check it out when you have time. Talks about water hammer and irrigation systems etc. sorry I meant to post link not copy. Added link.

link here

Last edited by jmon; 03-05-2013 at 11:55 PM. Reason: added link
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Old 03-05-2013, 10:23 PM   #7
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Water hammer noise and sprinkler


Your original post is pretty confusing for a frequent poster. "I replaced pipe in the bathroom and now the sprinklers hammer?"

Pretty Bizzare. Has all the new work had all the air bled off?
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Old 03-05-2013, 10:26 PM   #8
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Water hammer noise and sprinkler


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Your original post is pretty confusing for a frequent poster. "I replaced pipe in the bathroom and now the sprinklers hammer?"

Pretty Bizzare. Has all the new work had all the air bled off?
Not exactly what I said, but no only one valve in the shower has yet to be bled. New sink lines hot and cold have been as well as new toilet line. But shower valve has not been bled yet.
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Old 03-05-2013, 11:23 PM   #9
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Water hammer noise and sprinkler


Double check your new work and make sure the pipes are secure and not banging around.
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Old 04-28-2013, 06:50 PM   #10
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Water hammer noise and sprinkler


OK so the hammer is still there and now we are getting a serious vibration or flutter when the shower valve is turned from the full on position to a mid mix valve position. All pipes secure.

So I guess I need to add some water hammer devices?
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Last edited by digitalplumber; 04-28-2013 at 09:25 PM. Reason: spelling and "all pipes secure"
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Old 04-28-2013, 09:23 PM   #11
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Water hammer noise and sprinkler


"E", assuming DP bled and rechecked all work, is it possible a pressure regulator could be at fault? Rereading the thread, he never had any problem with hammer, vibration or flutter until he replace some galvanize pipe with copper pipe, then turned on his sprinklers. Thanks.

Last edited by jmon; 04-28-2013 at 09:29 PM.
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Old 04-28-2013, 09:29 PM   #12
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Water hammer noise and sprinkler


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E, assuming DP bled and rechecked all work, is it possible a pressure regulator could be at fault? Rereading the thread, he never had any problem with hammer, vibration or flutter until he replace some galvanize pipe with copper pipe. Thanks.
A little more history about this:

The shower we replaced had the plumbing on a wall we took out. Moving to another wall placed the piping under a low roof line so 12-18 inch galvanized pipe arrestors were not replaced.

I have been looking online and apparently the ones that are made can be installed in any direction.

I can do this, but also need to know if I cannot get the arrestor right above the valve, what is the farthest I can install it?

Since I also here it when the sprinkler goes on and off, can I get buy with just the cold side?
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Old 04-28-2013, 09:36 PM   #13
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Water hammer noise and sprinkler


Thanks for clearing that up for us DP.
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Old 04-28-2013, 09:47 PM   #14
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Water hammer noise and sprinkler


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I can do this, but also need to know if I cannot get the arrestor right above the valve, what is the farthest I can install it?
I would say, try to get arrester as close as possible to the valve.

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Since I also here it when the sprinkler goes on and off, can I get buy with just the cold side?
Maybe. I would install one on both hot and cold.

Let's see what "E" reccommends, he should be on soon. Thanks.

Last edited by jmon; 04-28-2013 at 09:49 PM.
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Old 04-29-2013, 12:23 PM   #15
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Water hammer noise and sprinkler


When we moved into our house, we were delighted to find a section of pipes vibrated extremely loudly, while toilet was filling or sink was running. I replaced the toilet, but the vibration remained. Then, I drained the entire system...hot and cold lines, including the water tank. Filled it all back up, purged air out of the lines, and vibration was gone. I don't have much explanation, but it worked. Could've been bad angle stop valves, they were shot after 20 years, but I didn't touch them at the time.

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