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Water Pipe Pounding in House

Old 01-27-2017, 03:43 PM
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Default Water Pipe Pounding in House

After 20 years of functioning soundlessly, I have started hearing some pounding or vibrating in the water pipes in my house when I flush the master bedroom toilet.

At the same time, I also have noticed higher water pressure from my water faucets intermittently. Does this mean the water pressure step down valve from the street to the house needs to be replaced?
Old 01-27-2017, 03:51 PM
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[QUOTE=Frank007;9909388]After 20 years of functioning soundlessly, I have started hearing some pounding or vibrating in the water pipes in my house when I flush the master bedroom toilet.

At the same time, I also have noticed higher water pressure from my water faucets intermittently. Does this mean the water pressure step down valve from the street to the house needs to be replaced?[/QUOT

At the very least u need some straps
Old 01-27-2017, 03:55 PM
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High water pressure can cause pipes to vibrate.
You could have what is referred to as water hammer.It is caused by fast-closing valves, like toilet fill valves and faucets. As the water flows through the pipes and the valve shuts off quickly, it causes the water to stop suddenly in the pipes, causing the hammer effect
Put a gauge on your spigot closest to the meter and see what the pressure is.(get one with female hose threads so you will be able to screw this onto a hose bib or washing machine bib).
.
There should be a screw on the pressure regulator you can adjust



Last edited by Thalasso; 01-27-2017 at 04:06 PM.
Old 01-27-2017, 05:11 PM
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Could be your air traps have been absorbed in the the water and you no longer have air cushions, but that would not cause pressure increases.
need to check to see if pressure if getting out of wack
Old 01-27-2017, 05:52 PM
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First change all ballcocks if that does not work install Sioux chief hammer arrestors ...
Old 01-27-2017, 06:23 PM
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First thing to do is turn off electric HW breaker, then turn off main water valve. Next open water valves all over house. By the time you finish, you can go back around and close all of them. Then turn on main water valve, and finally HW breaker. Could refresh your air hammers and possibly solve.

If that doesn't work I would work on testing pressure.
Old 01-27-2017, 10:14 PM
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Similar issue changed pressure reducing valve and all back to normal.
Old 01-28-2017, 05:00 AM
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Its worked for silently for 20 years so I don't think it's as simple as refreshing the water hammer arrestors though it's worth trying, if that was the case it would needed to be done on a much more annual basis. The problem is when he flushes the toilet and that is a slow closing valve so I don't think it's a water hammer problem like it could be with a fast closing valve such as a dishwasher or washing machine. Sounds like it is a high pressure water forcing by the toilet fill valve trying to close and causing chattering, how old are the toilet internals? I would start by replacing them and then go from there.
Old 01-28-2017, 03:59 PM
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The toilet internals were changed in the past couple of months. The pressures high throughout the house.
Old 01-28-2017, 04:01 PM
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The pressure is high sometimes and not others.
Old 01-28-2017, 05:28 PM
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If it is higher than it should be some times or even fluctuating, seems like you need to look at what controls the pressure
Old 01-28-2017, 05:49 PM
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Originally Posted by Frank007 View Post
The pressure is high sometimes and not others.
Go get a water pressure gauge like i suggested and check your street pressure.
$10.00 at HD
Old 01-28-2017, 06:04 PM
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Originally Posted by Thalasso View Post
Go get a water pressure gauge like i suggested and check your street pressure.
$10.00 at HD
This. ^^ Or try calling your water dept. They might check it for free.
Old 01-28-2017, 06:51 PM
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I used to work for a water district. We did a long-term study (over 10 year period) of water pressure regulators. For the more expensive heavy duty regulator the diaphragms lasted an average of 7 years. For cheaper regulators - like in a tract house - the average was only 3 .5 years. If you have 20 years on yours it might be time for a change. Get the gauge as suggested and test it. Make sure to do a static test with everything shut off, and then one with a faucet running somewhere. If you have a good one they can be rebuilt; if you have a cheap one just replace it.

Do it before you get a slab leak!
Old 01-28-2017, 06:59 PM
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Amazon.com: Watts DP IWTG Water Pressure Test Gauge
https://www.amazon.com/Watts-DP-IWTG.../dp/B000YMU8JC

https://www.google.com/url?sa=t&rct=...AIU1R2KxDbrMaA

Static Water Pressure:
Turn off all the water in the house and simply screw the gauge onto a hose bib. Turn on the faucet. The gauge will indicate your pressure in pounds per square inch (psi).
Dynamic water pressure: Turn the red needle back to the zero mark and leave the gauge on the hose bib for a day. The red needle will hold at the highest pressure recorded
Old 01-28-2017, 07:41 PM
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Had the same thing. Tried some straps. Only got worse. Had to replace the pressure reducing valve.

Called the city and they said street pressure was 80lbs. MY PRV had gone. Had a new one put on. Guy said they generally come preset at 55. Immediate fix.
Old 01-29-2017, 08:41 AM
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Draining the system is an easy do as suggested by MacG. Open highest vents, turn off hot water breakers if electric, and lowest faucets. Works for me about every 2 or 3 years. The pressure regulator may also be a problem as noted.
Good Luck!

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