Low flow bore pump [RE-wrenches]

[allan]

Kurt,
    For a surface pump application, consider a Danoff Solar Slowpump model
1322-24V running at half-speed (15V array-direct or 12-14V battery.  At 20'
of head, .25 gpm, and ~16-18w of PV; at 200' of head, .23 gpm and 45w of PV.
    Last weekend we installed something like this, where we set a spring box
in a slow spring; used the Slowpump set above high water level; laid the 30"
filter horizontally below low water level; and used a float switch on the
remote shutoff circuit of a Solar Converters LCB, to prevent run-dry.
Worked great.

Carl,
    A SunRise deep-well sub model 5218 could handle this, sort of.  You
didn't indicate total head and drawdown, only well depth, so for example, at
275', running half-speed with a controller, it will pump .8 gpm--still too
fast, but 1) the pump tolerates running dry without damage, and 2) the
controller has a dry-run sensing circuit that shuts the pump off for 20
minutes or so to recharge the well.

Hope this helps.

Allan at +E
-----Original Message-----
From: Kurt Nelson, SunWise <sunwise at win.bright.net>
To: RE-wrenches at topica.com <RE-wrenches at topica.com>
Date: Monday, September 25, 2000 10:29 PM
Subject: Re: Low flow bore pump [RE-wrenches]


>Carl Emerson wrote:
>>
>> Anybody know of a low flow bore pump with the following spec. ??
>>
>> Flow  1.6L/min or 100L/hr (26 US Gal hr).
>> The well depth is 85m (278.8 feet)
>> Diameter of casing is 100mm PVC (4 inch).
>>
>> All the pumps I know of would suck the well dry as it has a low yield.
>>
>Greetings Carl,
>
>Sorry, I can't help but would like to up the stakes.  I'm also
>interested in a low-flow deep-well pump (you didn't mention the
>voltage), but would also like to hear of anyone producing an ultra-low
>flow surface pump that could produce approximately a guart to a liter a
>minute.  This would be at a good GPM/WH efficiency and I'd be interested
>in low voltage DC, but perhaps ac as well.  Seems like there are a bunch
>of old or driven point wells out that are not considered usable because
>almost any standard pump won't go that low in flow.  Has there been any
>use of the pumps that use a cam or rotating lobe to depress a circular
>(plastic) hose?  I've seen these in medical and chemical pumps and
>wonder if they might not work out, at least in a sub-pumps or pumps with
>a very low suction lift?  Kurt Nelson
>
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