Thanks Bob for providing a useful way of testing the cfm of pumps/systems.
Lynton
----- Original Message -----
From: Nic Pattison <nicksonstream_at_yahoo.co.nz>
To: <compost_tea_at_yahoogroups.com>
Sent: Monday, January 26, 2004 9:16 PM
Subject: [compost_tea] air
> Bob - it seems to me in the short time i have watched
> this space that you seem endlessly to promote your own
> stuff. OK but kind of boring. Bob's brewers are
> acknowledged and your work is reknowned. I for one
> would appreciate some hard data relaying success of CT
> on various crops etc. Then we can play with snorkels
> and bikinis.-
> Nic-- Robert Norsen <bnbrew_at_yahoo.com> wrote: > Some
> months ago there was a rash of concern about
> > true air volume. It seems many air pumps did not
> > put put out the volume they were rated at. Others
> > put out more when the actual air was measured at the
> > outlet. For large air system an air flow meter
> > could be used. For small pumps the air flow meter
> > is rather approximate and most of us don't own one.
> > So I measured the air carefully collected in a light
> > weight plastic bag for an exact time, like 1 minute.
> > fit the loosely fillled bag in a box where
> > rectangular dimensions permitted actually measuring
> > the volume. Easy enough. 10 minute test. .
> >
> > How to do this under 3 feet of water? Cold water ?
> > Brrrr ! Do this:
> >
> > Same thing in reverse. Inflate a bag to a known
> > volume, bag measured in a box. Secure the air
> > carefully with a tube that will fit the INLET of
> > your pump. Get the pump going long enough to reach
> > equalibrium. That is, all the water of the air
> > system blown out so the system is operating as it
> > will. Then introduce the tube to the INLET with no
> > air leaking in around the inlet. Measure the exact
> > time it takes to deflate the bag. Convert that to
> > CFM Note this does not measure your air pump. It
> > measures your entire aeration system. If your pump
> > puts out more than your system even when out of the
> > water or in very shallow water, maybe the holes in
> > your aeration system need to be increased. However
> > expect a decrease in air flow as the release level
> > in water gets deeper, Bob 01 25 04
> > No snorkle No
> > bikkini . Ruined your fun??
> >
>
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Received on Mon Jan 26 2004 - 16:55:02 EST