As always, Ben, you come through with the correct cold logic! (LOL!!!)
I realize it's probably totally impractical and for myself, I'd stick a
check valve onto the line 6" downstream from the outflow outlet on the pump
and call it a day.
But coming up with a practical innovative low cost run dry pump with enough
pressure to 'clear' the line to the thru-hull would be an interesting
intillectual exercise for a "garage tinkerer".
I'm one of those always looking for a completely dry (and sparkling clean -
I'm talking eat off it clean) bilge. Haven’t found the boat that could meet
that criteria yet. And I'm not going to spend the $$ to find a boat "built
around" that kind of a bilge!
I'll go back to looking for the Holy Grail with the rest of the Monty Python
crew....
S
Steve Weinstein
S/V CAPTIVA
1997 Hunter 376, Hull #376
Sailing out of Oyster Bay, NY
All outgoing mail protected by VIPRE A/V
-----Original Message-----
From: Ben Okopnik
Sent: Thursday, April 12, 2012 2:15 PM
To: liveaboard@liveaboardonline.com
Subject: Re: [Liveaboard] How often do you clean your shower sump...
Hey, Steve -
On Thu, Apr 12, 2012 at 12:54:55PM -0400, SteveW wrote:
> There's your explanation, Norm.
>
> I wonder whether anyone makes a run-dry bilge pump which can continue to
> run
> and push air through the hose.
I know of a number of pumps that can run dry indefinitely, but most of
them are bigger than what's normally used as bilge pumps and aren't 12V.
They also cost a good bit. Possibly a reasonable solution for the bigger
boats, not so much for the average yacht. The key factor here seems to
be that there's a very small market for this type of application - so
the costs and the implementation time are going to be high. Most people
just have a small "pocket" in the bilge, where the pump lives, and don't
mind carrying the extra pint or so of water.
>From the tech perspective, how would such a pump "know" when to stop
pumping? You could have an "after-run" circuit that would make it pump
for, say, an extra 60 seconds after the float switch shut off, but
adding electronics to a bilge pump just doesn't sound like a great idea
- and would add even more to the cost.
> Could be a nice research project for someone with a lot of time on their
> hands :-) !
Seems like figuring out how to get around the size/power/complexity/cost
issues would be the big challenge here.
Ben
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