Patrick: I don't think anything will keep the boat afloat if a 1-1/2" thru hull disintegrated.
I do understand your concern but given the difficulty have you considered adding a third pump slightly higher as an emergency pump? As you will be running new plumbing anywhere that is convenient you can make it as big as you like. John Sent from my iPad > On Apr 14, 2016, at 3:40 PM, Patrick Davin via CnC-List > <cnc-list@cnc-list.com> wrote: > > I've been debating my bilge pump plan for a few months now, and having > trouble deciding. What have others here decided is sufficient pump capacity? > > I have two Rule 800s now and am considering upgrading one to an 1100 or 2000 > gph, as a high water alarm. That will require upgrading the hose from 3/4" to > 1 1/8", and enlarging the thruhull at the toerail. One of the bilge hoses > runs through the stbd head (into the head cubbies) and the other runs through > the hanging locker fwd of the head. Upgrading will require enlarging some of > the hose holes in the boat's liner (below the cabin sole) probably, and of > course hole sawing a larger thru hull. So it's a good deal more work than > just replacing bilge pumps, their wiring, and adding a float switch + alarm. > > From Wally's page I know he installed a Rule 2000. > http://www.wbryant.com/StellaBoat/Projects/bilgepmp/bilgepmp.htm > However it sounds like Wally's LF38 had his hoses run differently - to the > stern quarter - while mine are to stbd mid-ships. > > With two 800's I'm at the low end of the 1600-2000 gph capacity range > recommended by West Marine (and yes I've read all about how actual capacity > may be much lower, due to voltage drop, head pressure, etc). I've also heard > it doesn't make much sense to say that bigger boats need bigger bilge pumps - > a 20' boat will sink just as fast (or faster) with a 1.5" hole as a 38' one > will. > > I'm more concerned with having the capacity to prevent the boat from sinking > at dock if say a 1.5" thruhull disintegrated somehow. Less concerned with > emergency pumping while onboard, because I'm not going far offshore and I > have a lot of emergency hole plugging options to try (putty, foam, wood > bungs, carrots, etc). > > -Patrick > 1984 C&C Landfall 38 > Seattle, WA > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you like > what we do, please help us pay for our costs by donating. All Contributions > are greatly appreciated!
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