# AW: AW: linear piston pumps

```Oh you are right, that was a mistake in writing things down, though I had
understood. I also meant 140 mbars over the environmental pressure.

Erik

> -----Ursprüngliche Nachricht-----
> Von: owner-killietalk at aka_org [mailto:owner-killietalk at aka_org]Im
> Auftrag von Ron Schulz
> Gesendet: Montag, 22. Juli 2002 01:36
> An: killietalk at aka_org
> Betreff: 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
> >
> > ---------------
> > See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
> > Join the AKA at http://www.aka.org/AKA/Applic.htm
>
> ---------------
> See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
> Join the AKA at http://www.aka.org/AKA/Applic.htm
>

---------------
See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
Join the AKA at http://www.aka.org/AKA/Applic.htm
```