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Re: T&T: new holding tank installation

WP
w.k. perkins
Tue, Feb 12, 2008 6:21 PM

I must disagree with the statement that the "worst is the filling of the
holding tank"
I have personal experience with the fact that a siphon can fill the tank and
back up through the head.

I put in an above water line loop and feel much better.

Phil & Sally
The Sally Ann 42 Hershine SDMY
Ballena Isle, Ca.

Your holding tank, on the other hand, has an outlet that is below the>

waterline (I surely hope so, anyhow). The inlet to that hose is not>
free-flowing, but is in fact connected to the holding tank (in the case of>
the poster, through a pump which contains two one-way valves). The tank>
itself has air vents, so it can't be part of a siphon. And finally, even if a>
siphon were to form, at the very worst you could do is to fill the holding>
tank with seawater.> > Scott Welch> FirstClass Product Manager>
www.firstclass.com> > Those who make no mistakes rarely make anything.>
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I must disagree with the statement that the "worst is the filling of the holding tank" I have personal experience with the fact that a siphon can fill the tank and back up through the head. I put in an above water line loop and feel much better. Phil & Sally The Sally Ann 42 Hershine SDMY Ballena Isle, Ca. > Your holding tank, on the other hand, has an outlet that is below the> waterline (I surely hope so, anyhow). The inlet to that hose is not> free-flowing, but is in fact connected to the holding tank (in the case of> the poster, through a pump which contains two one-way valves). The tank> itself has air vents, so it can't be part of a siphon. And finally, even if a> siphon were to form, at the very worst you could do is to fill the holding> tank with seawater.> > Scott Welch> FirstClass Product Manager> www.firstclass.com> > Those who make no mistakes rarely make anything.> _______________________________________________> http://lists.samurai.com/mailman/listinfo/trawlers-and-trawlering> > To unsubscribe or modify your subscription options (get password, change email address, etc) go to: http://lists.samurai.com/mailman/options/trawlers-and-trawlering> > Trawlers & Trawlering and T&T are trademarks of Water World> Productions. Unauthorized use is prohibited. _________________________________________________________________ Helping your favorite cause is as easy as instant messaging. You IM, we give. http://im.live.com/Messenger/IM/Home/?source=text_hotmail_join
SH
Scott H.E. Welch
Tue, Feb 12, 2008 7:34 PM

"w.k. perkins" wkperkins@hotmail.com writes:

I must disagree with the statement that the "worst is the filling of the
holdsing tank"
I have personal experience with the fact that a siphon can fill the tank and
Iback up through the head.

That will only happen if you have a non-positive-displacement pump for your
holding tank (and also only if your vents are blocked). In the spacific case
under discussion, the poster was planning on using a Sealand diaphram pump.

Scott Welch
FirstClass Product Manager
www.firstclass.com

Those who make no mistakes rarely make anything.

"w.k. perkins" <wkperkins@hotmail.com> writes: >I must disagree with the statement that the "worst is the filling of the >holdsing tank" >I have personal experience with the fact that a siphon can fill the tank and >Iback up through the head. That will only happen if you have a non-positive-displacement pump for your holding tank (and also only if your vents are blocked). In the spacific case under discussion, the poster was planning on using a Sealand diaphram pump. Scott Welch FirstClass Product Manager www.firstclass.com Those who make no mistakes rarely make anything.