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Old 05-19-2019, 03:47 AM   #1
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loud water pipe knocking in bathroom of 21

my e21 recently started making rather loud pipe 'knocking' sounds from the bathroom sink under certain water flow conditions when under DC pump pressure.

is that just air in the pipes? at one point today, the bathroom water pipe made a really loud KNOCKKNOCKKNOCKKNOCK like it was vibrating and banging into something. its never done that before.
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Old 05-19-2019, 07:22 AM   #2
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Air in plumbing will result in what is known as "water hammer" and normally a small reserve air tank is installed to absorb the shock. In addition this residual tank will allow you to use water without the pump always activating. But first check you pump pressure.
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Old 05-19-2019, 07:30 AM   #3
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My trailer does that until all the air is purged from the lines. If itís the hot line itís air coming from the water heater. Just let it run for awhile and it should quit.
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Old 05-19-2019, 07:31 AM   #4
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Here is a short video explaining and fixing it...
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Old 05-19-2019, 08:18 AM   #5
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Old 05-19-2019, 08:24 AM   #6
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Wouldn't a water pressure regulator help with this and be an easier install?
https://smile.amazon.com/Camco-Press...s%2C226&sr=8-1
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Old 05-19-2019, 09:00 AM   #7
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Quote:
Originally Posted by Farther View Post
Wouldn't a water pressure regulator help with this and be an easier install?
https://smile.amazon.com/Camco-Press...s%2C226&sr=8-1
Water pressure regulators only impact cg or city water hookups, your on board pump can also be set too high or maybe failing, it is a 5 year old trailer. Either way, air in the lines causes the air hammer sound, not too high pressure, that causes leaks.
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Old 05-19-2019, 09:19 AM   #8
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Quote:
Originally Posted by cpaharley2008 View Post
Either way, air in the lines causes the air hammer sound, not too high pressure, that causes leaks.
I don't want to belabor the topic but back in the day when I was a new firefighter-medic, we did company fire inspections and we were always instructed to look for thrust blocks (or lack thereof) on the fire sprinkler system because the water pressure caused water hammer when the water flow changed suddenly. Maybe we are talking about two separate topics, water hammer vs. air hammer. Either way, it is a fluid hammer which I suspect is very similar.

In the This Old House video above it would have been interesting if the plumber reversed the installation order and tested the system after securing the pipe and before installing the mini pressure tank device.
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Old 05-19-2019, 10:27 AM   #9
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Would an accumulator eliminate this kind of issue?
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Old 05-19-2019, 02:42 PM   #10
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Would an accumulator eliminate this kind of issue?
Probably would help...
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