[Public-List] Bilge pump question

[Gordon Laco]

Hi George - 

Head really cuts the output of the pump -  the fine print always relates the
pump's capacity to how far it has to push... Something rated at 500 gal per
hour may only push a fraction of that if it has to push a 5' head.

Gord #426



> Gordon Laco wrote:
>> Hi folks - 
>> 
>> I am kicking around the idea of having the electric pump (which I don't have
>> yet) bail into the cockpit from a position over one of the drains.  I would
>> put a small clamshell over the outlet to divert the water down and let it
>> exit the boat through the cockpit drain.
>> 
>> My objectives in this line of thought are two-fold...
>> 
>> First - I wanted to minimize the head up which the electric pump would have
>> to push the water - maximizing its performance.  I could just use the
>> through hull for the manual or give it its own near the waterline but I
>> would still have to give it a loop up high to inhibit syphoning.
>> 
>> Second - I wanted to be able to see the volume of water it was moving.  One
>> problem with the pump I had in my old boat (Touch Wood) was that I could not
>> easily tell if it was moving water.
>> 
>> Ok - let me have it with your comments...
> 
> Sounds good, Gord.  I'm not clear on how much the pump head is affected
> by altitude and how much by hose length.  Then I'm a neophyte with these
> electric pumps.
> 
> - George


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