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Re: [Shop-talk] Seasonal water hammer?

To: shop-talk <shop-talk@autox.team.net>
Subject: Re: [Shop-talk] Seasonal water hammer?
From: Larry Spector <lspector@gmail.com>
Date: Wed, 5 Nov 2014 14:46:26 -0500
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
References: <CAFNB6W=9ajXpRqi-OeEOFoQOqooFntfExLCrx93O3X1By64jjA@mail.gmail.com> <ABB60A27904F463498C22178137ABBA0@EricJRussellPC>
Thanks for the feedback.

There are small "preventers" on the back of my clothes washer, but there's
not much volume there. I've tried draining the whole house a couple of
times, to try and empty out any water that may have collected. That tends
to work for a week or so, but it doesn't last.

I was thinking of adding an expansion tank near the water inlet, something
like this:
http://www.homedepot.com/p/Watts-8-5-in-W-x-11-5-in-D-x-8-5-in-H-Pre-Pressurized-Steel-Water-Expansion-Tank-DET-5/100677607

I believe that it might be easier to do this, than to add vertical pipes in
the space I have access to.

-Larry

On Wed, Nov 5, 2014 at 1:33 PM, Eric J Russell <ejrussell@mebtel.net> wrote:

> Is there a water hammer preventer in the system? (I don't know if that is
> the real name - usually a capped off section of vertical pipe, the
> intention is for that vertical piece to be filled with air and act as
> damper for sudden changes in water pressure.)
>
> If so, the cold weather would likely reduce the volume of air in the water
> hammer preventer, lessening the dampening effect. Draining the water pipes
> might let it get refilled with air and return the preventer to full effect.
> Or a larger vertical pipe (longer or larger diameter) might fix it.
>
> Eric Russell
> Mebane, NC
>
> ----- Original Message ----- From: "Larry Spector" <lspector@gmail.com>
> To: "shop-talk" <shop-talk@autox.team.net>
> Sent: Wednesday, November 05, 2014 12:50 PM
> Subject: [Shop-talk] Seasonal water hammer?
>
>
>
>  I've got an odd problem, and it's been going on for a couple of years now.
>> Every fall, when the cold water supply (county water) starts getting even
>> colder, I get water hammer. I can usually get it to go away by turning off
>> the tap and turning it back on slowly, but it's a pain to deal with.
>>
>> Any idea what may be causing it and what can be done to alleviate it?
>>
>> Thanks,
>> Larry
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