BEST WAY TO INSTALL NEW H2O PUMPS?

[Pete Masterson]

Awhile back, I installed a new ShurFlow 5.7 variable speed pump on my
coach. I used large loops of 3/4" PEX from the hard gray plastic
pipe. The strainer is attached to the pump. One loop of PEX comes
from the hard connection, makes a large loop and terminates at the
input of the strainer. The pump output goes through a second large
loop of PEX and attaches to the previously existing gray plastic
pipe. The reason for having a flexible connection is that the
vibration of the pump(s) can eventually loosen the plumbing
connections with a hard, inflexible hook up.

Since the variable speed pump did not require the pressure tank, this
resulted in a considerable simplification of the plumbing as compared
to the original dual pump and pressure tank set up. The only
difficulty I experienced is that the 3/4" PEX required a fairly large
radius loop to avoid pinching. 1/2" PEX would have been much easier
to work with in the space available. (But the instructions suggested
3/4" for the 5.7 variable speed pump.)

I have some photos of the installation, but unfortunately, I'm not on
my usual machine for Internet access and I can't post 'em at this time.

Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42
aeonix1@...
On the road at Idaho Springs, CO



On Aug 22, 2008, at 8:48 PM, Kurt Horvath wrote:

> Just received 2 new Classic Shur-Flo pumps 3.5 GPH 45 PSI for the
> Indulagance. In the installation instructions it states that you
> should install 2' of flexible high pressure tubing on each side of
> the pump. Also it states that the strainers," should not be attached
> to any hard pipes."
>
> WWWWEEEEEEEELLLLLLLL, the pumps currently have the strainers mounted
> directly to the pumps, and of course the pumps are plumbed directly
> to hard plastic pipes.
>
> This has shades of the inverter re-positioning project.
>
> Anybody have any ideas?
>
> The two obvious choices are to replace the existing pump as they are
> currently installed. Or add the 2' of flexible tube to the existing
> system.
>
> The reason for the flex tubing is to keep vibrations from being
> transmitted through the coach plumbing, which does happens to some
> extent. With the flex tubing wing nuts, it would be easier to replace
> or repair the pumps, than if they were hard pipe plumbed, so that's
> one plus for the flex pipes.
>
> Anyway let hear some ideas. Thanks for your time
>
> Kurt Horvath
> 95 PT-42
> 10AC
>
>
>
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