Common Cylinder Sizes
In scuba diving, the United States measures cylinder volume by the amount of free air that can be compressed into the cylinder; Europe measures the cylinder volume as the internal volume of the cylinder: e.g. United States 19 cubic feet = European 3 liter at 180 bar.
The below are example cylinder sizes and do not constitute an industry standard.
| Cyl. Size | Size* Diameter X Height (inches) Includes 5.5 inches for valve and cap. | Nominal* Tare Weight (lbs.) Includes 4.5 lbs. for valve and cap. | Water Capacity (lbs.) | Internal Volume @ 70°F (21°C), 1 ATM liters (cubic feet) | U.S. DOT Specs |
|---|---|---|---|---|---|
| 2HP | 9 x 51 | 187 | 43.3 (1.53) | 3AA3500 | |
| K | 9.25 X 60 | 135 | 110 | 49.9 (1.76) | 3AA2400 |
| A | 9 X 51 | 115 | 96 | 43.8 (1.55) | 3AA2015 |
| B | 8.5 X 31 | 60 | 37.9 | 17.2 (0.61) | 3AA2015 |
| C | 6 X 24 | 27 | 15.2 | 6.88 (0.24) | 3AA2015 |
| D | 4 X 18 | 12 | 4.9 | 2.24 (0.08) | 3AA2015 |
| AL | 8 X 53 | 52 | 64.8 | 29.5 (1.04) | 3AL2015 |
| BL | 7.25 X 39 | 33 | 34.6 | 15.7 (0.55) | 3AL2216 |
| CL | 6.9 X 21 | 19 | 13 | 5.9 (0.21) | 3AL2216 |
| XL | 14.5 X 50 | 75 | 238 | 108 (3.83) | 4BA240 |
| SSB | 8 X 37 | 95 | 41.6 | 18.9 (0.67) | 3A1800 |
| 10S | 4 X 31 | 21 | 8.3 | 3.8 (0.13) | 3A1800 |
| LB | 2 X 15 | 4 | 1 | 0.44 (0.016) | 3E1800 |
| XF | 12 X 46 | 180 | 60.9 (2.15) | 8AL | |
| XG | 15 X 56 | 149 | 278 | 126.3 (4.46) | 4AA480 |
| XM | 10 X 49 | 90 | 120 | 54.3 (1.92) | 3A480 |
| XP | 10 X 55 | 55 | 124 | 55.7 (1.98) | 4BA300 |
| QT | 3 X 14 includes 4.5 inches for valve | 2.5 includes 1.5 lbs for valve | 2.0 | 0.900 (0.0318) | 4B-240ET |
| LP5 | 12.25 X 18.25 | 18.5 | 47.7 | 21.68 (0.76) | 4BW240 |
| Medical E | 4 x 26 excludes valve and cap | 14 excludes valve and cap | 4.5 (0.16) | 3AA2015 |
Read more about this topic: Gas Cylinder
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