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RE: Air Pump
Glenn: As a chemical engineer who deals with process equipment on a regular
basis, I think I recognize the type of pump that halbasch saw as a
"regenerative blower". These types of air pumps consist of a single moving
part: the rotor, which compresses air via centifugal action. Since there
are no valves, this type of blower is one of the most reliable ways to move
air at low pressures (low pressures means less than 1 atm in the chemical
industry). In fact, these pumps actually increase in efficiency with age.
An added bonus is that they are extraordinarily efficient. Several
different models are available from Grainger, Inc. (www.grainger.com). If
you don't have access to a Grainger near you, I suggest you try searching
the Thompson Catalog, which is a compilation of industrial equipment makers.
(Don't have the website address handy, but you can locate it easily in most
internet search engines).
One other possible source is Wet Thumb Aquatics.
Regards,
David Keller
> -----Original Message-----
> From: Glenn Ford [SMTP:gford at voyageursw_com]
> Sent: Friday, April 02, 1999 3:02 PM
> To: killietalk at aka_org
> Subject: Re: Air Pump
>
> Dear halbasch,
> Should you find this pump, please let me know. I would like to have
> one
> also.
> Thanks
> Glenn Ford
>
> halbasch at es_com wrote:
>
> > I just returned from a 2 week trip through S.E. Asia. My boss kept
> reminding
> > me this was not a fish collecting trip but a business trip. I still
> managed
> > to make a few side trips to look at fishy things. Perhaps the most
> > interesting item I saw on the trip was a fairly large air pump that was
> also
> > extremely quiet. From a few feet away I was unable to hear it at all.
> It
> > was virtually silent. There were two of the pumps running and they
> supplied
> > air to 8 tanks each. The smallest tanks were 60 gallons and the largest
> were
> > in the 80-90 gallon range. All the tanks were of the tall configuration.
> The
> > pumps were driving multiple airstones and bubblers in each tank. Each
> pump
> > was driving 30-40 airstones at a depth of approx. three feet. There were
> > fairly large quantities of air being driven and not just a slow trickle
> from
> > each airstone. Even more impressive was that both of the pumps had 1991
> > manufacturing dates on them and they were being run outside! These tanks
> and
> > pumps were covered by a small sunshade but were basically open to the
> > elements. I never saw the pumps available in any of the fishshops. They
> > label said they were manufactured by P.T. Yasunaga of Indonesia. I tried
> the
> > phone book in Singapore but no luck. The label also said they were 50/60
> Hz
> > 100 Vac systems with an output of 32 L/min. I have done some web
> searches
> > with no success. Anyone out there know anything about these pumps?? If
> they
> > are not too expensive I would like to get my hands on one or two.