Special Ops Paintball: CO2 to HPA Tank Size Comparisons - Special Ops Paintball

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CO2 to HPA Tank Size Comparisons Ounces to CI at 3000 and 4500 PSI Rate Topic: -----

#1 User is offline   WardenWolf 

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Posted 14 February 2008 - 11:05 PM

By my calculations, at 25 shots per 12-gram, an ounce of CO2 is worth approximately 5.906 cubic inches of HPA at 3000 PSI, or 3.9373 cubic inches on a 4500 PSI tank. So if you're trying to relate CO2 to HPA, that's a good comparison. To equal a 9 ounce CO2 tank, you will need approximately a 53.154 CI 3000 PSI tank, or a 35.44 CI tank at 4500 PSI. For a 16 ounce tank, you'd need about a 63/4500 tank or a 94/3000 tank. So if you want to compare, a 68/4500 tank is reasonably close to a 16 ounce CO2 tank, particularly since HPA tanks are typically slightly underfilled.

Of course, mileage will vary. CO2 typically gives less performance than what it's rated for simply because it is a highly volatile gas. As you shoot, both temperature and pressure fluctuate, and this can cause some guns (particularly autococking designs) to not work properly. By the time you're down to 1 ounce of CO2 in the tank, you're going to be shooting horribly, whereas with an HPA tank you will have solid performance right up until you hit your marker's cutoff point. HPA also won't freeze up, so you can shoot as fast as you can pull the trigger.

Now, I know these calcs aren't exact, by any means. However, they ARE a solid rule of thumb. A 16 ounce tank can give between about 800 and 1200 shots, by simple math using the existing numbers (multiply the already known 9 ounce values by 16/9). Go dead center on that, and it turns into about 1000, which match up nicely with my calcs at 25 shots per 12-gram, which are dead center between 20 and 30.

These numbers have passed a couple different validation means for comparison. They're overall very correct. You can use this to determine what HPA tank size compares to a CO2 tank. That way you can know how much gas you'll need to run your marker after you make the switch.


So, here's a list of common CO2 tank sizes and their approximate HPA tank size:


9 ounce:
3000 PSI: 53.154 CI
4500 PSI: 35.44 CI

16 ounce:
3000 PSI: 94.496 CI
4500 PSI: 62.997 CI

20 ounce:
3000 PSI: 118.12
4500 PSI: 78.746

Note: mileage may vary depending on your marker and temperature. However, the proportions should remain largely accurate:

1 ounce of CO2 ~ 5.906 CI of HPA at 3000 PSI

OR

1 ounce of CO2 ~ 3.9373 CI at 4500 PSI

This post has been edited by WardenWolf: 15 February 2008 - 12:05 AM


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#2 User is offline   Florentine 

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Posted 17 February 2008 - 06:39 AM

good post. i was wondering the same info myself, just never decided to ask. good job warden
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#3 User is offline   bubba3 

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Posted 21 March 2008 - 01:40 AM

I dont know about some of those #s. I use to run a 20oz on my A5, than I swiched to a 68/3000 and i notest I was geting more shots with the 68 than the 20oz. by your #s a 68/4500 is only going to get about 150-160 more shots than a 20oz.... thats just over a pod worht, something just dosnt seam right there. I think Ill do a real test with my 9oz, 20oz, 68/3000, and my 88/3000...Ill post the outcome
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#4 User is offline   Galihad 

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Posted 21 March 2008 - 03:26 PM

great write up Warden, maybe even sticky worthy :ghillie:

and Bubba one thing you have to consider is temp, and rate of fire

since the colder the outside temp is, the less expansion of CO2, equals less shots per tank

also the faster you shoot the quicker your tank cools, which also equals less shots per tank

this is one reason he said it was a rough estimate. There are alot of variables in paintball and since this isn't a college disertation, but rather one mods write up, we should take it as such. :ghillie:
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#5 User is offline   Ritsuka 

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Posted 27 March 2008 - 03:08 PM

Erm, with my 72/3000psi N2 tank After 2 days of play and shooting in my back yard I still have 1000psi left even after some 800 rounds...
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#6 User is offline   sartek 

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Posted 09 June 2008 - 09:27 AM

Using Molecular weight, 20oz of co2 = 10.7 cubic feet of gas - a 68/45 tank holds 12.04 cubic feet.

Due to the higher density of Co2, however, you get more shots per given volume than with HPA. this is why Warden's calculations are fairly true.
Keep in mind that with higher average temperatures, this gap will increase even more, as you will use even less CO2 due to thermal expansion; which HPA tends largely to ignore.
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#7 User is offline   WardenWolf 

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Posted 05 August 2008 - 04:30 PM

DARK_KIDO, on Mar 27 2008, 03:08 PM, said:

Erm, with my 72/3000psi N2 tank After 2 days of play and shooting in my back yard I still have 1000psi left even after some 800 rounds...


The actual shots per CI is actually about 11 at 3000 PSI, not 10. As a result, a 72/3000 will indeed give you around 800 shots. It's been quite some time, but I think I did my calculations based on this, not 10.

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#8 User is offline   logmonkey 

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Post icon  Posted 23 February 2009 - 06:31 PM

I got well over 1500 shots out of my 20oz co2 the other day through my A-5 with a palmers stab.
when I did Air on gun I only got about 600shots per fill.
Just to bragg...
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#9 User is offline   jake9095 

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Posted 29 March 2010 - 09:59 AM

wow, you just did so much math right there
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