Sometimes the air head space in the top of a water can go away and be replaced with water. When water is heated, it expands. If there is no air space to expand, it has to go somewhere. Ever see a weeping PTR valve leaking water? Re establish the air space in the tank and the weeping stops. If one does not have a accumulator tank, the pressure is then on the water pump. Chuck B
JIM FLUCKEY <jflu653@cox.net> wrote:
All, I feel I must chime in and maybe shed some light on the accumulator
issue. Water is not compressable to any reasonable extent, therefor as
heated water expands some means of allowing this extra volume to go
somewhere must be built into the system. The air space in the water heater
is there for this reason. True, the increased pressure is in the whole
system but the air space gives the non-compressable water somewher to go.
Jim & Sally Fluckey
2001 40' Allegro Bus
Jeep Liberty 4X4 toad
----- Original Message -----
From: "Gary Brinck" <gbrinck@cfl.rr.com>
To: <Diesel-RVs@yahoogroups.com>
Sent: Friday, January 25, 2008 4:14 PM
Subject: [Diesel-RVs] Re: House WATER PUMPS
> Not sure what your point is, Chuck. I'm not arguing with you about Shurflo
> failures and I AGREED that back pressure is a problem that Shurflo had to
> deal with. The only point I was trying to make is that the air head in the
> tank that was alluded to in your earlier post neither causes nor
> alleviates back pressure from the hot water tank - the back pressure is
> there just the same whether there is a air head or not. The same would
> apply to the air head in an accumulator, which is probably why they don't
> recommend that either.
>
> Am not trying to be argumentative - just clarifying the effect of an air
> head in the system.
>
>
>
>> Gary,
>> Shurflo warranty's their high end Smart Sensor pumps for 3 years. They
>> were
>> experiencing a excessive failure rate of damage to the internal pump from
>> back flow pressure. They do not recommend the need for using a
>> accumulator
>> tank with that pump. Their studies and testings found that that the the
>> pumps
>> that failed came off RV's with hot water heaters as opposed to RV's that
>> were
>> equipped with Aqua/Hydro hot systems. Because of replacing pumps under
>> warranty, Shurflo had to either quit making the Smart Sensor pumps or
>> correct
>> the situation be redesign. They chose the latter. I had several
>> discussions
>> withn their engineers on the phone and at the last FMCA International
>> rally.
>> That is their answer.
>> Therefore it appears that you are shooting from the hip trying to make
>> your
>> point. Chuck B
>
>
> Gary
> --
> Gary & Nancy Brinck
> 2004 American Tradition 40V
> 2007 GMC Acadia
>
>
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>
Chuck & Mary Boros
04 Windsor 02 Ford Ranger
Shelby Dog, Miss Kitty, Mr Lucky Cat
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