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Old 04-19-2010, 04:39 AM   #1 (permalink)
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how much co2 in a cubic inch?

I have a 8ci tank that I use as co2 source (pin valve)
How much co2 should fit inside?
the tank is 3000psi certified, so it probably has thicker walls than 3.5oz one. it is also smaller than 3.5

here two 8ci and 13ci tanks (2xmyth, 1x invert reg)
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Old 04-19-2010, 05:29 AM   #2 (permalink)
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Off the top of my head, I'd say, fill with water, pour into a graduated cylinder (measuring CC/ML). Find how much it will hold, convert that into cubic inches. Then you need to find what percentage of the tank should be full when it is at it's max. That would be a technical question, most likely call a tank manufacturer if they will tell you.

If the tank can hold 10 oz of water, but the max percentage filled is 70%, easy, fill to 7 oz. Of course there is math to figure out the conversions, ie the ml/cc into cubic inches, then find the weight and some other wizbang math my brain refuses to tell me right now.
Long story short, probably easier finding a small 7 oz tank.
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Old 04-19-2010, 05:35 AM   #3 (permalink)
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the problem is that CO2 tanks are measured by weight, not volume, so you'd have to figure out the volume of a roughly equivalent size tank, find the % difference between the two, then apply the % to the fill weight of the CO2 tank to find the fill weight of your air tank

or you could just use a CO2 tank......................
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Old 04-19-2010, 05:59 AM   #4 (permalink)
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So just like I said, just worded much more clearly. :P
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Old 04-19-2010, 06:39 AM   #5 (permalink)
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I think it's about 2 oz.... there was a similar conversation on this board a month or two ago.
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Old 04-22-2010, 07:31 AM   #6 (permalink)
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ok did some more searching and found this:
Quote:
How much liquid is in a "full" tank? Why not fill it up?

A "full" tank contains about 34% liquid CO2. If it is filled any more, the CO2 will become very sensitive to temperature changes, with a small increase in temperature causing a large increase in pressure. This is a dangerous situation which is avoided by only partially filling the CO2 bottle.

One cubic inch of water weighs 0.577 oz and the specific gravity of liquid CO2 is 1.977 gm/cc so one ounce of liquid CO2 has a volume of 0.877 cubic inches. CO2 bottles generally have a full-fill to volume ratio of about 2.57 cubic inches per ounce of CO2, so that one ounce of CO2 will take up 0.877/2.57 = 34% of the total volume of the bottle.

The figure of 68% is often quoted as the volume of liquid in a full bottle, but this error probably stems from translating "ounce" into volume using water as the standard. Water is 1.00 gm/cc, or about half the density of liquid CO2 so that if a CO2 bottle is filled to its rated capacity with water, it will be 68% liquid by volume.
CO2 Dynamics

so it looks like 3,5oz tank has actually smaller volume than 8ci tank!

8ci* 0.877=7oz CO2

(correct me if i'm wrong)
but the 8oz tank is liek 75% the size of 3.5! are the walls thiner? or maybe it's made of steel (looks like alu to me)


yep, I'm wrong :P my math was always poor.
Luckily i found this:
Re: [PSUBS-MAILIST] Pressure compensation - CO2 vs Air

Quote:
Bottle Volumes:

Bottle size (oz) Volume (cu in)
3.5 9.0
7.0 18.0
12.0 31.0
20.0 51.0

So a 20 ounce CO2 paintball tank has a volume of 51 cubic inches * 37% full-fill = 18.8 cubic inches of liquid * 1:553 expansion ratio = 10435 cubic inches of gas / 1728 cubic inches per cubic feet = 6 cubic feet of gas.
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Last edited by rogalxxx; 04-22-2010 at 08:04 AM.
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Old 04-22-2010, 06:41 PM   #7 (permalink)
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Quote:
Originally Posted by rogalxxx View Post
ok did some more searching and found this:
There are all sorts of math errors on the warpig site.

Instead, use the Catalina Cylinders Website. There is a chart where you can convert easily between Cubic-Inches and CO2 weight.

ie
9ci = 3.5oz
18ci = 7oz
31ci = 12oz
41ci = 16oz
51ci = 20oz
etc

These are the max amounts. Any more and the tank will go supercritical with the pressure spiking to dangerous levels.
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