Low flow bore pump [RE-wrenches]

[jay peltz]

Hi All,

Your only other choice is go with a jack pump and then vary the speed to keep
the flow rate where you want it.  They are expensive and much more complicated
to install however.

Solar jack used to carry(make)them, and I know that Lehmans has them too.

Jay

allan wrote:

> 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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