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post #1 of 7 Old June 5th, 2010, 04:30 PM Thread Starter
 
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How long does CO2 last???

Does anybody know how I can calculate how long a CO2 tank will last at a particular psi and cfm. For instance, if my requirements are 4.5cfm at 60psi. The only measurements I can find for CO2 tank is there capacity in lbs. Any help is appreciated.

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post #2 of 7 Old June 5th, 2010, 08:12 PM
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Re: How long does CO2 last???

Quote:
Originally Posted by txwpd103 View Post
Does anybody know how I can calculate how long a CO2 tank will last at a particular psi and cfm. For instance, if my requirements are 4.5cfm at 60psi. The only measurements I can find for CO2 tank is there capacity in lbs. Any help is appreciated.
I'll run the calcs for you if you can fill me in:
What do you need to power and for how long do you need 4.5 cfm? That's a pretty fair amount of volume.
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post #3 of 7 Old June 5th, 2010, 08:17 PM Thread Starter
 
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Re: How long does CO2 last???

Originally I was wanting to provide air to a Hypertherm 380 plasma cutter until I found out that it wont arc with Co2. Now just wanting to know how long I could run an impact wrench or cutoff tool say on a 20lb tank.

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post #4 of 7 Old June 5th, 2010, 08:37 PM
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Re: How long does CO2 last???

i have a 15 and a 20 lb tank and the 20 lb will fill 6 trucks with 31 to 33 in tires from 20 psi to 70 psi and run a impact to change all our sxs's tires sevrall times 5 sxs's and also fill tires on them all weekend....and have never run out .... a cutout tool will use alot.


a 15lb tank has 120 cuic ft of air or 900 gall of air

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post #5 of 7 Old June 5th, 2010, 08:42 PM Thread Starter
 
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Re: How long does CO2 last???

Thanks for the info. I am definately leaning this direction.

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post #6 of 7 Old June 5th, 2010, 08:51 PM
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Re: How long does CO2 last???

Quote:
Originally Posted by txwpd103 View Post
Originally I was wanting to provide air to a Hypertherm 380 plasma cutter until I found out that it wont arc with Co2. Now just wanting to know how long I could run an impact wrench or cutoff tool say on a 20lb tank.
The impact generally uses short burst of air/co2. So you can use a 20lb. tank to change a few sets of tires. A cutoff tool / die grinder sucks up air like crazy. You will empty a 20lb. tank in just a few minutes.
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post #7 of 7 Old June 5th, 2010, 08:58 PM
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Re: How long does CO2 last???

A 50# cylinder of CO2 will be mostly liquid, which is where you get the big volume numbers. Compressed air, on the other hand is always in a gaseous state, and therefore the volume is very low for even a large diameter cylinder. Most hobby shop air compressors have about a 20 gallon tank. Air is measured in gallons, CO2 in pounds because of it's liquid state.
With the proper regulator, and keeping the CO2 tank between 60 and 90 degrees (slows the gassing rate) you should be able to use your impact off and on for weeks. This is a really tough calculation. Here are the variables: are your hose fittings tight? Is the tool working like new, or are the rotary vanes worn to the point that the efficiency has dropped? Are you doing routine tasks, or are you breaking rusty or corroded farm machinery fasteners?
Remember, air motors are extremely inefficient in performing tasks. They eat air like it's going out of style. We use electric tools when possible, as there is no waste. Electricity is 100% efficient. Air tools are never better than 50 % effecient. You need to have electricity to compress the air, then you need the air to run the tool. Makes sense! If you are looking for portability, I would go rent a 50 pound CO2 tank and the correct regulator for 4.5 cfm. There are many different regulators for beer kegs, soft drink fountain machines, HVAC servicing to blow debris out of coils etc.
This is a tough question with no pat mathmatical answer. Sorry.
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