There is an article in the new Sail magazine. In it it says you would need something like 3000 gph capacity if a large hose broke.
Joel On Thursday, April 14, 2016, John Pennie via CnC-List <cnc-list@cnc-list.com> wrote: > Patrick > > Just to correct my earlier post - if you do go with a third pump, the pump > itself doesn't have to be any higher. Just the float switch for it. Make > it a hummer of a pump a give it a dedicated circuit. > > John > > > Sent from my iPad > > On Apr 14, 2016, at 4:08 PM, John Pennie via CnC-List < > cnc-list@cnc-list.com > <javascript:_e(%7B%7D,'cvml','cnc-list@cnc-list.com');>> wrote: > > 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 > <javascript:_e(%7B%7D,'cvml','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! > > _______________________________________________ > > 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! > > -- Joel 301 541 8551
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