02-07-2012
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Join Date: Oct 2007
Location: Madison
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All good points of course.
I'm just saying that in a real emergency the numbers don't always work out the way we would like them.
Even in good laboratory conditions you can easily get a 30 percent reduction in de-watering results from expected.
The slightest mistake, in hose routing or size or any number of things and the effectiveness can be worse.
A clean bilge is a worthy goal and achievable but again the slightest mistake, leaving the smallest thing out on the chart table that gets bounced off in rough conditions and the bilge is no longer clean.
This chart from PS shows how the actual flow is often from 20 to 30 percent less than the advertised flow and that is in a laboratory setup with brand new everything.
And it can be much worse as sometimes the claimed gph is based on no head.
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