Bilge pump throughhull location.
 

Looking for thoughts on the following problem.

I have got two bilge pumps for the main bilge on Rutu. A little 5 gpm
Jabsco diaphragm pump on a strum box to take care of minor accumulations and
a Rule 3700 for the Oh, %&$@* ! situations. My problem is how to run the
hose for the 3700. The basic rule is that the through hull should always be
above the water line but that would mean out the transom. The dynamic head
for 25' of hose back to the transom is a lot more than a short run through a
vented loop to a through hull at the waterline on the side even including
the loss from a check valve.

The side outlet would have less head and much less back flow but the through
hull would be under water when the boat is heeled. Any suggestions?

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

Bilge pump throughhull location.
 

How about a vented loop to a TH right under it (where you can get to the
shutoff, of course)?

On the Flying Pig, there are two such, which are the cockpit drains - the
bilge goes up to the top, and tees into those drains, so effectively it's
going straight down, again. BIG hoses...

L8R

Skip, less than a week from going, and only 2 days out from my 3 stents
required by my stress test results...

--
Morgan 461 #2
SV Flying Pig KI4MPC
http://tinyurl.com/384p2 The vessel as Tehamana, as we bought her

"Twenty years from now you will be more disappointed by the things you
didn't do than by the ones you did do. So throw off the bowlines. Sail
away from the safe harbor. Catch the trade winds in your sails. Explore.
Dream. Discover." - Mark Twain
"Glenn Ashmore" wrote in message
news:MKaHf.25427$Dh.21078@dukeread04...
Looking for thoughts on the following problem.

I have got two bilge pumps for the main bilge on Rutu. A little 5 gpm
Jabsco diaphragm pump on a strum box to take care of minor accumulations
and a Rule 3700 for the Oh, %&$@* ! situations. My problem is how to run
the hose for the 3700. The basic rule is that the through hull should
always be above the water line but that would mean out the transom. The
dynamic head for 25' of hose back to the transom is a lot more than a
short run through a vented loop to a through hull at the waterline on the
side even including the loss from a check valve.

The side outlet would have less head and much less back flow but the
through hull would be under water when the boat is heeled. Any
suggestions?

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

Bilge pump throughhull location.
 

Glen,
I run mine to a deck fitting from which I can use a number of hoses and
nozzles, but I also have a ball valved sea water feed to the mud box. So, in
my case, I can also use this pump for a utility sea water pump. In my
application, the mud box is serviced by a big 2" Jabsco driven from the
generator. Although our applications are different, the deck outlet with a
cap on deck is a neat, clean and maintenance free solution. In an emergency
situation, soiling the deck area, would not be your most pressing thought
nor would outlet submergence.
Steve

"Glenn Ashmore" wrote in message
news:MKaHf.25427$Dh.21078@dukeread04...
Looking for thoughts on the following problem.

I have got two bilge pumps for the main bilge on Rutu. A little 5 gpm
Jabsco diaphragm pump on a strum box to take care of minor accumulations
and a Rule 3700 for the Oh, %&$@* ! situations. My problem is how to run
the hose for the 3700. The basic rule is that the through hull should
always be above the water line but that would mean out the transom. The
dynamic head for 25' of hose back to the transom is a lot more than a
short run through a vented loop to a through hull at the waterline on the
side even including the loss from a check valve.

The side outlet would have less head and much less back flow but the
through hull would be under water when the boat is heeled. Any
suggestions?

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com