From: "Gary Brinck" <gbrinck@cfl.rr.com>
To: <Diesel-RVs@yahoogroups.com>
Sent: Thursday, January 24, 2008 7:47 AM
Subject: [Diesel-RVs] Re: House WATER PUMPS
> Chuck,
> Unless I flunked my physics courses, the pressure in the hot water tank
> will be the same whether there is an air head or not. Like everything
> else, water expands when heated. For that matter, so does the air head -
> it reaches the same temperature as the water in the tank. The air gets
> compressed, increasing the pressure throughout the tank and back along
> the cold water inlet.
>
> This does not dispute the notion that back pressure could cause pump
> failures. However, maintaining a good air head won't alleviate that
> problem. What it will do is prevent water leakage at the
> pressure/temperature relief valve.
How so? If the pressure/temperature relief valve is leaking it will leak
water whether or not there is/was air in the tank once there is incoming
water pressure on the tank.
Darrel Goheen
PressurePro@tvnav.com
http://www.tvnav.com/pressurepro.html
Voice 785-625-3546/FAX 413-383-8800
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