# Re: AW: linear piston pumps

```You might be confusing absolute pressure with guage pressure. 14.7 PSIA =
approx 1 atmosphere of pressure = approx  1000 millibars which on a guage
will read 0 PSIG  If the guage is marked in absolute terms (most are not),
it will read 14.7 PSIA. When Lee says 2 PSI, he means 2 PSI above
atmospheric pressure or approx 16.7 PSIA or 2 PSIG or approx 140 millibars
above atmosperic pressure or approx 1140 millibars.
.............................Beemster
----- Original Message -----
From: "Erik Pfingstner" <erikpfingstner at freenet_de>
To: <killietalk at aka_org>
Sent: Sunday, July 21, 2002 12:10 PM
Subject: AW: AW: linear piston pumps

> thanks Lee and Hello,
>
> I just had a hard time figuring out what 2 PSI was equivalent in the
> civilized metric system :-)
>
> You know we in the civilized world use bars and millibars as pression
units.
> And your american new world dictionary gave me a hard time by giving me a
> wrong definition. So, if I got things right, 1 PSI is equivalent to 70,4
> millibars. I am not quite sure though.
>
> Does someone have a conversion table to check it up? By the way, it would
be
> good to post somewhere a conversion table (or conversion formulas) for all
> the anglo-american measurement units into metric system. I think we
> europeans have a hard time understanding you when you use your funny units
> :-)
>
>
> > << do you know what volume of air does your machine pump? >>
> >
> > 1.6 CFM @ 2 PSI is what is claimed. I have not measured it.
>
> That is 45 litters per minute pumped at 1,4 meters under water. Funny,
that
> is very little air but the hell of a pressure. In usual aquaristic
> environments, we do not have such pressures. But what was written in
> previous mails suggests that it pumps much more air when the pressure is
> lower.
>
> Erik
>
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