A friend of mine asked me the other day about carbon fiber air tanks on eBay and how some of this type of HPA tanks that are made here in the USA are measured in cubic feet and not liters. Well I didn’t have a clue what to tell him so I told him I would get back to him when I had the answer. It took a while with Google and the sites that came up and before I knew it bout 4 hours went by and I missed my window to make it to the shooting range. Anyway what I found is that for every liter is 9.5 cubic feet at a 300 Bar fill. Apparently this does not apply to SCUBA tanks that are made of steel or aluminum and the formulas they use to convert them are to say the least confusing as all get out...at least to me anyway which is how I missed out on the shooting range.
According to the information I found listed by Acecare...a carbon fiber tank manufacturer in China this is the amounts they list their tanks to hold at 300 Bar fills.
12 Ltr =115 CF
9.0 Ltr = 86 CF
6.8 Ltr = 65 CF
3.0 Ltr = 29 CF
2.0 Ltr = 19 CF
1.5 Ltr = 14 CF
1.0 Ltr = 9.5 CF
500cc = 4.25 CF
I hope someone finds this information helpful. The Cubic Feet values are rounded to the nearest whole number for the most part and are accurate on the larger tank sizes within a half of cubic foot. Again these values and conversion do not apply to dive tanks because they are filled to a lower pressure and cannot be filled to the extreme 300 Bar pressures a carbon tank can hold. Another thing that was posted by Acecare was breathing time for liters and they were as simply as 3 Ltr = 30 minutes, 6.8 Ltr =60 minutes, 9 Ltr = 90 minutes, 12 Ltr = 120 minutes.........so basically for every Liter of air compressed to 300 Bar you get 10 minutes worth of breathing time. I don’t see how this is relevant in the air gunning world but simply posted this just Incase that question for whatever reason would arise. Hope you find this helpful. Nothing this simple is posted anywhere else on any Google search I tried. You need a PHD or something and a bottle of headache pills to figure out the formulas that in the end still don’t apply to a 300 Bar fill. Only fill pressures like 200-232 Bar and aluminum steel dive tanks have a different algorithm altogether. I didn’t figure any of this out. The values I have listed are all posted by the manufacturer. If you fill you tank to this 300 Bar pressure or 4351.13 psi, it is your responsibility to make sure that your tank is made for that pressure and in good shape. You or someone near you could be hurt and you equipment could be damaged. Always make sure your equipment is rated for the pressures you intend to obtain. Safety first. Be careful, 300 Bar is the weight of a car! Of course y’all know someone’s not gonna listen and have to clean out their shorts when a burst disk or a line pops. Thanks again for all the guys that have helped me on the forum. Hope this helps someone as much as y’all have help me.
According to the information I found listed by Acecare...a carbon fiber tank manufacturer in China this is the amounts they list their tanks to hold at 300 Bar fills.
12 Ltr =115 CF
9.0 Ltr = 86 CF
6.8 Ltr = 65 CF
3.0 Ltr = 29 CF
2.0 Ltr = 19 CF
1.5 Ltr = 14 CF
1.0 Ltr = 9.5 CF
500cc = 4.25 CF
I hope someone finds this information helpful. The Cubic Feet values are rounded to the nearest whole number for the most part and are accurate on the larger tank sizes within a half of cubic foot. Again these values and conversion do not apply to dive tanks because they are filled to a lower pressure and cannot be filled to the extreme 300 Bar pressures a carbon tank can hold. Another thing that was posted by Acecare was breathing time for liters and they were as simply as 3 Ltr = 30 minutes, 6.8 Ltr =60 minutes, 9 Ltr = 90 minutes, 12 Ltr = 120 minutes.........so basically for every Liter of air compressed to 300 Bar you get 10 minutes worth of breathing time. I don’t see how this is relevant in the air gunning world but simply posted this just Incase that question for whatever reason would arise. Hope you find this helpful. Nothing this simple is posted anywhere else on any Google search I tried. You need a PHD or something and a bottle of headache pills to figure out the formulas that in the end still don’t apply to a 300 Bar fill. Only fill pressures like 200-232 Bar and aluminum steel dive tanks have a different algorithm altogether. I didn’t figure any of this out. The values I have listed are all posted by the manufacturer. If you fill you tank to this 300 Bar pressure or 4351.13 psi, it is your responsibility to make sure that your tank is made for that pressure and in good shape. You or someone near you could be hurt and you equipment could be damaged. Always make sure your equipment is rated for the pressures you intend to obtain. Safety first. Be careful, 300 Bar is the weight of a car! Of course y’all know someone’s not gonna listen and have to clean out their shorts when a burst disk or a line pops. Thanks again for all the guys that have helped me on the forum. Hope this helps someone as much as y’all have help me.
