Re: [PSUBS-MAILIST] Pressure compensation - CO2 vs Air

["George Slaterpryce" <gslaterp@hotmail.com>]

Co2 Liquifies at about 750psi at room temperature

 

Temperature being the biggest variant the lower the temp the lower the pressure.

 

 

George H. Slaterpryce III
www.bridgessoftware.com
www.captovis.com

----- Original Message -----

From: Paul Kreemer

To: personal_submersibles@psubs.org

Sent: Tuesday, October 17, 2006 4:17 PM

Subject: Re: [PSUBS-MAILIST] Pressure compensation - CO2 vs Air

I think at room temp CO2 goes liquid at close to 60 atmospheres.  60 bar actually which is pretty close to 60 atmospheres. 

I'd just read something interesting about it, in that it gives a pretty constant pressure out of a bottle while discharging most of its volume.  The bulk of the CO2 stays liquid and just vaporizes as it's valved off - so the pressure ends up staying at 60bar.  I don't know if that's true but it seems to make sense. 


Paul

On 10/17/06, DJACKSON99@aol.com <DJACKSON99@aol.com > wrote:

Dean

 

It's more of a question than advise.  If CO2 will work at 5 atm, someone on this list will hopefully correct me.

 

Thanks --Doug J

 

In a message dated 10/17/2006 1:34:48 PM Central Daylight Time, Recon1st@aol.com writes:

In a message dated 10/16/2006 10:26:40 PM Central Daylight Time, DJACKSON99@aol.com writes:

to a liquid at just over 5 atm

Doug great info. Ya just saved me time investigating the issue. I new it

remained liquid at a fairly low pressure but did not think it was that low.

I do plan on making 300 to 400 foot working depth.

 

Nitrogen sounds good and maybe argon, quite a ways to that stage but

for right now I know I want the volume of this pressurized area to be minimal

 

 

Dean