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
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>>
>>
>> _______________________________________________
>>
>> Thanks everyone for supporting this list with your contributions.  Each
>> and every one is greatly appreciated.  If you want to support the list -
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>> _______________________________________________
>
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> and every one is greatly appreciated.  If you want to support the list -
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>
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