Bruce, That's why I like the 2 stage system which I suggested. It gets the best of both worlds. You absolutely make valid points about the weaknesses of centrifugal pumps.
Josh On Tue, Jun 23, 2020, 22:53 bwhitmore via CnC-List <cnc-list@cnc-list.com> wrote: > I hate disagreeing with Josh or Edd as I respect you guys so much. > > But my opinion is that if you need volume pumping, something is > dramatically wrong. If you're not on the boat, it will sink anyway. If > you're on the boat, it may give you more time to find the leak, but my > centrifugal pumps tend to clog, bind up, or at least never pump to the > stated volume. > > I'd rather have a 300 gph pump I think will actually pump that much than a > 1,000 rated gph pump that ultimately I don't think I can fully rely on that > actually delivers 500 gph. > > Centrifugal pumps tend to rely on numbers without lift, where diaphragm > pumps are not affected nearly as much. > > Just my $.02 worth > > Bruce > > > Sent from Samsung tablet. > > > -------- Original message -------- > From: Josh Muckley via CnC-List <cnc-list@cnc-list.com> > Date: 6/23/20 10:16 PM (GMT-05:00) > To: C&C List <cnc-list@cnc-list.com> > Cc: Josh Muckley <muckl...@gmail.com> > Subject: Re: Stus-List Bilge pump question > > The diaphragm pumps are great for getting the very last drops but they > tend to be relatively low flow rate. I would suggest that you consider > adding as high of a capacity pump as will fit and have it run on an > automatic switch. You could have them run simultaneously but really having > just the new high flow pump run as the primary pump is sufficient. Once > the bilge is pumped, you can pump the dredges manually with the diaphragm > pump. > > For high flow you're basically going to get a centrifugal pump. I > replaced the original Rule with another pricey Rule pump which failed > withing 3 years. I replaced it with a Walmart Atwood Pump which failed > within 3 years and replaced it with the current Johnson pump. I'm not > hopeful that it will last more than 3 years. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > > > On Tue, Jun 23, 2020, 16:02 Matt Wolford via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Listers: >> >> New topic. My boat came with a really nice diaphragm pump for >> the bilge, but it operates on a manual switch. I was going to change the >> switch and install a sensor in the bilge to make it automatic, but it >> occurs to me that having redundancy is a good idea for this application. >> Which pumps to people like for placement in the bilge? I picked up a water >> witch sensor, so I don't need an automatic pump. Thanks in advance for >> suggestions. >> >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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