Math question... Anyone can help I would appreciate it?

[WetWillie]

I am trying to do the math on the following problem and I need some help.
I want to use a 88gram C02 cartridge (Cartridge does not say how much air is in it?) and want to flow 45psi of air out of it with a regulator. How can I figure out how long the cartridge will run for??
Does this make sense??
http://www.hesvanzweeden.nl/media/Airsource_tanks.jpg

[MR.rvrluvr]

till it runs out of air.....:D :D sorry I had too....

[WetWillie]

I just dont want to waste my time building somthing if it lasts 10 seconds..
what other info do I need to figure this out?

[Jordy]

You need more information I think, such as volume and perhaps the pressure inside the cartridge. :idea:

[Sleeper CP]

You need more information I think, such as volume and perhaps the pressure inside the cartridge. :idea:
Yeah, what he said. Volume and pressure would help you answer your question. Think of an air compressor tank, big dif between 40 psi and 110 psi.
I think you are going to need to just do a dry run, unless you can call the manufacture and ask an engineer there.
Just my .02
Sleeper CP

[WetWillie]

What the hell does the 88 gram stand for??

[cruser]

I say it depends on the volumn of the cartride and the discharge rate. It lasts as long as it lasts. Kinda like sex.

[faster]

if you can regulate the flow of air then you can control how long it will take

[YeLLowBoaT]

use this forumla
pV=nRT That will give you the volume of CO2 at 45 psi at a given temp...
p= presure, V= volume, n = number of moles( number of moleclues divide by avogadro's number) R = the constant of proportionality(8.314 472 J mol-1 K-1 )
take the volume you get and divide by the cfm you need and you will get you and approx run time

[ROZ]

continuous or short bursts? and how long each burst? regardlss, the co2 canister mfg will be able to answer that question with ease...

[ROZ]

pV=nRT
One more thing, that formula looks like it says "pervert" :D

[Sleeper CP]

use this forumla
pV=nRT That will give you the volume of CO2 at 45 psi at a given temp...
p= presure, V= volume, n = number of moles( number of moleclues divide by avogadro's number) R = the constant of proportionality(8.314 472 J mol-1 K-1 )
take the volume you get and divide by the cfm you need and you will get you and approx run time
Hell, it might be easier to just put a regulator on it and run a stop watch on it.
Isn't he going to need some specialty equipment to regulate that small of a stream of air. Or could he use an air brush regulator and line?
Sleeper CP

[Baja Big Dog]

How exact do you need?
Although the pV=nRT is an equivalent calculation, it is not accurate due to the little ambient temp thing. As CO2 passes an orifice, it radicly changes temperature, at 45 PSI it wont change a lot, but it will change. What are you doing with it?
Your only talking about 3 OZ's, better use a very good, and small regulator (rated for over 2500 psi), as the regulator will use up most of the bottle CO2!

[SB]

Dang, I'm glad someone else remembered that formula, I can't remember which issue People magazine it was in. :D
Your rocket will not reach the moon. :D
You have just enough to fart the National Anthem on the harmonica. :D
I'm calling Al Gore to tell him you are emitting CO2.