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Old 12-23-2017, 05:57 PM   #1
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Waterhammer issue


Just bought this house and when the toilet gets full it gives a loud noise in the pipes under the house.

As far as the faucets only if i close them quickly.

My water pressure is 78,I did the main shutoff and drain pipes procedure with no luck, i partially closed the main which solved the issue but water pressure was too low.

Ill attach some pictures from my inspection report, any advice is appreciated
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Waterhammer issue-bfb5859b-c198-4879-a553-619edef051a8_1514073420680.jpeg   Waterhammer issue-250b47cf-7917-4c52-8d65-3c23fb956633_1514073429855.png  
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Old 12-23-2017, 06:39 PM   #2
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Re: Waterhammer issue


You are high my friend. Typical home is about 50 PSI plus or minus a little. I would start with a pressure reducing valve.
High pressure and knocking pipes is a recipe for a indoor flood.
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Last edited by Yodaman; 12-23-2017 at 06:41 PM.
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Old 12-23-2017, 09:45 PM   #3
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Re: Waterhammer issue


high normal is 75 psi...max reading should be below 80 psi so you are right at the line where problems exist... & that gauge while reading 78, actually shows a spike in pressure of ~110 psi unless the red dial was not properly reset before installing test FWIW. That type gauge is usually left in play for a period of at least 24 hrs to record the highest pressure spike such as from thermal expansion or a failing PRV...

I agree a PRV is very advisable but do not discount proper pipe supports and proper spacing of these supports- code requirements are minimums...securing any pipe movement, especially the ability to knock into other pipes & or the structure can & will cause what you are describing. Start with tracing the cold water supply line to that toilet and manually but gently move pipe in every direction it will freely move to see what else is interacting if anything... have a helper flush toilet to also see what occurs... More Strapping or Supports could be your cure but do verify that potential spike in pressure or simply install a PRV

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Old 12-23-2017, 10:47 PM   #4
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Thank you very much
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Old 12-24-2017, 10:01 AM   #5
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Re: Waterhammer issue


MAke sure you remove all the steel hangers from the copper pipe and replace with copper or plastic hangers.
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Old 12-24-2017, 11:03 AM   #6
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Quote:
Originally Posted by Ghostmaker View Post
MAke sure you remove all the steel hangers from the copper pipe and replace with copper or plastic hangers.
Got it
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