Hieght for bilge exit

73Chrysler105

Chief Petty Officer
Joined
Sep 10, 2009
Messages
407
Re: Hieght for bilge exit

Does anyone have a pic of a boat with the bilge discharge installed this low on the hull, I've never seen a real boat with one installed this low. I'm pretty sure the reason I've never seen one installed this low is because when a boat starts taking on water the stern sinks in the water which would put the discharge under water.

Bilge pumps are made to work hard, that's their job.

I think the illustration is for illustration purposes only and not to be taken to scale. If you look at it that is the exit for the backup which in my opinion should be higher since when you need it you will more than likely be taking on or heavily weighed down by water and they don't show were the primary exits. All of mine have been on the side under the cap but as high as can be. The hose has always been a direct hose that continually travels in an upward direction. On a much taller boat I can imagine there is a lot more room to figure that out. I think what most of us can all agree on is that it needs to be above the water line enough to make sure it is not under water 99% of the time.
 

chriscraft254

Commander
Joined
Jun 4, 2011
Messages
2,445
Re: Hieght for bilge exit

Does anyone have a pic of a boat with the bilge discharge installed this low on the hull, I've never seen a real boat with one installed this low. I'm pretty sure the reason I've never seen one installed this low is because when a boat starts taking on water the stern sinks in the water which would put the discharge under water.

Bilge pumps are made to work hard, that's their job.

You must not have seen where it says a "minamum" of 12 inches. Its just a diagram showing a dual pump set-up. The exit for the pumps hose should be as high as you can get it and a little forward on the hull from the stern is also A good idea. With that being said, when people are sizing there pump, they need to keep in mind that it needs to be sized properly because every inch of rise and every inch of hose provides resistance which provides less gph from the pump rating.
 
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