The only concern with a position displacement vane pump is that they can burn up if run without sufficient water - if for example you left it on or the float stuck. They are also often relatively high current and low flow. The rubber impellers are wear items so planning a replacement strategy is important.
There are other positive displacement pumps that might achieve the same dry bilge in a more cost effective way. Diaphragm pumps come to mind. Rubber diaphragms eventually wear out too but some have the advantage of being able to pass "trash". These too are relatively low flow and would best be paired with a high volume emergency pump. https://www.whalepumps.com/marine/product-application.aspx?Category_ID=10000&FriendlyID=Bilge Josh On Tue, Jan 15, 2019, 4:04 PM Dennis C. via CnC-List <cnc-list@cnc-list.com wrote: > You would NOT have a backflow issue since impeller pumps are positive > displacement. One big advantage of the impeller system is the suction hose > could be routed to the very lowest point in the bilge sump. Impeller pumps > are self priming down a few feet. While the float switch would shut off > before complete emptying, you could empty the sump on "manual". > > With a typical centrifugal pump, you can only lower the water level to the > inlet of the pump. Don't know about your boat, but on Touche', that leaves > a bunch of water in the sump. The only way I can empty it is with the > manual pump. > > Disadvantage might be trash damaging the impeller. However, impeller > pumps are widely used for bilge pumps on many, many boats. There was one > on Touche' when I bought it. I stupidly replaced it with a centrifugal > pump. :( Should have left it. > > Dennis > > On Tue, Jan 15, 2019 at 2:40 PM Richard Bush via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Dennis, I like your suggestion of the Ultra Safety systems switch and >> the water puppy pump; that's about $300.00 (+/-); what would the >> advantages (or disadvantages) be over the traditional systems...? >> How would the hose be routed? Would you still have the backflow problem? >> Thanks >> >> Richard >> >> _______________________________________________ > > 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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