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 - 11:52:06 EST