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Thread: Water hammer
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02-13-2021, 01:44 PM #1
Water hammer
2019 Reflection 337RLS. Last couple of weeks hearing a clunking noise - clunk clunk - when I turn on water - either hot or cold, or toilet. I am full timing in the same place for the last few months and on city water. Sound coming from behind the hutch where the hot water tank and water panel is. Doesn't happen every time, only happens a few times per day. Sounds like water hammer from taking in air somewhere, but I don't know where that would be from. Any ideas ??
Hobo Bill
From Cuyahoga Falls, Ohio
Traveling Full Time Across the US
2019 Reflection 5th Wheel 337RLS
2007 Dodge Ram 3500 DRW Cummins 6.7 Turbo Diesel
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02-13-2021, 01:55 PM #2
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"Water hammer" happens when you turn the water off abruptly. Is the sound happening when you turn the water on or off? Also, air is more compressible so usually reduces water hammer - that's why many plumbers put the little capped-off pipe above the faucet manifold for an air trap. On the other hand, sometimes reducing the pressure in the hot water heater will cause some air bubbles to rapidly form. That's usually a one or two second sound rather than a single "rap."
RobU.S. Army Retired
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(Previously in a Reflection 337RLS)
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02-13-2021, 01:58 PM #3Hobo Bill
From Cuyahoga Falls, Ohio
Traveling Full Time Across the US
2019 Reflection 5th Wheel 337RLS
2007 Dodge Ram 3500 DRW Cummins 6.7 Turbo Diesel
Goodrich T/A KO2 All Terrain Tires
Reese RP30081 20K
[SIGPIC][/SIGPIC]
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02-13-2021, 02:08 PM #4
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U.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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02-13-2021, 02:19 PM #5
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Mike & Karen
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02-13-2021, 02:22 PM #6
Yes, using a water pressure regulator set at 45 psi and yielding 45 psi. Campground pressure ranges from 50-60. Would the expansion of the hot water heater also be as a result of flushing the toilet ? Thank you for your help and if you have other questions or comments let me know.
Hobo Bill
From Cuyahoga Falls, Ohio
Traveling Full Time Across the US
2019 Reflection 5th Wheel 337RLS
2007 Dodge Ram 3500 DRW Cummins 6.7 Turbo Diesel
Goodrich T/A KO2 All Terrain Tires
Reese RP30081 20K
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02-13-2021, 02:32 PM #7
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U.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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02-13-2021, 03:07 PM #8Hobo Bill
From Cuyahoga Falls, Ohio
Traveling Full Time Across the US
2019 Reflection 5th Wheel 337RLS
2007 Dodge Ram 3500 DRW Cummins 6.7 Turbo Diesel
Goodrich T/A KO2 All Terrain Tires
Reese RP30081 20K
[SIGPIC][/SIGPIC]
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02-13-2021, 09:39 PM #9
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I think Rob @Second Chance has you on the right track. But if that does not pan out, any chance you have your water pump turned on? My thought is when you first turn on the water, the pressure drops for a minute and the pump kicks in. Then pump turns off as soon as the pressure comes back up. Definitely a low possibility but wanted to toss it out there.
ChrisChris & Karen
Fort Collins, CO
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02-14-2021, 06:11 AM #10
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Isn't there suppose to be some air space in the water heater such than when it is filled there is some air in the top of the tank to allow for expansion? Isn't there a particular way to fill the water heater to establish (or re-establish) that air pocket? Could lack of an air pocket cause the noise?
I like the idea about the pump being on.Larry
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