SCUBA Cylinder Specifications

Compiled by Huron Scuba, Snorkel & Adventure Travel Inc. Ann Arbor, MI: (734) 994-3483

The information below was compiled from a variety of sources, including Luxfer, Pressed Steel Tank, Catalina, and OMS. The information is believed to be accurate, but is not guaranteed. If you have better information or corrections, please email it to us for inclusion in this table.

The key information for most people when selecting a cylinder is the the following:

  • Total weight (smaller people shouldn’t try to lug too much tank, whereas the strongest can deal with a 50-plus pound full tank)
  • Buoyancy empty (this affects how much weight you’ll have to add to your belt to compensate for the empty tank’s buoyancy)
  • Buoyancy full (affected solely by the weight of air in the tank, this gives a guideline to how much lead you’ll need on your weight belt to sink at the start of the dive)

Empty weight does not include the valve (except Pressed Steel noted with *), which would add 1.5 – 2.5 lbs. Buoyancy figures do include the valve.

Here is an Excel version of these tables, formatted to print and fit in a logbook. Thanks to Aaron Warner from Iowa for putting the compact version together.

Aluminum Cylinders
Manufacturer & Nominal Capacity Service pressure, psi Actual air capacity, ft3 Outer diameter, in Length without valve, in Empty weight, lbs (w/o valve) Buoyancy Empty, lbs (w/valve) Buoyancy Full, lbs (w/valve)
Catallina S6 3000 6 3.21 10.8 2.6 -1.1 -1.5
Luxfer 6 3000 6 3.21 10.87 2.72 -1.03 -1.49
Catalina S13 3000 13 4.38 12.8 5.7 -0.8 -1.7
Luxfer 13 3000 13.2 4.37 12.87 5.94 -0.72 -1.71
Luxfer 14 2015 13.7 4.4 16.5 5.4 1.7 0.7
Catalina S19 3000 19 4.38 17.4 7.8 0 -1.3
Luxfer 19 3000 19.9 4.37 18.56 8.09 0.12 -1.37
Luxfer 27 3000 27.9 5.3 18 11.4 0.6 -1.5
Catalina S30 3000 30 5.25 20 13.7 -0.2 -2.4
Luxfer 30 3000 30 4.87 21.85 11.61 1.2 -1
Catalina S40 3000 40 5.25 24.9 15.9 1.7 -2.6
Luxfer 40 3000 39.9 5.25 24.75 15.3 2.2 -0.8
Catalina S45 3000 45 6.89 17.7 20.3 1.3 -2
Luxfer 50 3000 48.4 6.89 19 21.2 1.3 -2.4
Catalina S53 3000 53 7.25 19.2 25.6 -0.2 -4.1
Catalina C60 3300 60 7.25 19.9 27.3 -0.4 -4.9
Catalina S63 3000 63 7.25 21.6 27.2 2 -2.6
Luxfer 63 3000 63 7.25 21.85 26.6 2.6 -2.1
Luxfer 72 3000 69.6 6.9 26 28.4 3.6 -1.6
Luxfer 80 3000 77.4 7.25 26.06 31.38 4.4 -1.4
Luxfer S80 3000 78.2 8 22.93 35.12 2.26 -3.6
Catalina S80 3000 77.4 7.25 25.8 31.6 4 -1.8
Catalina C80 3300 77.4 7.25 25.1 34.4 -0.2 -5.9
Luxfer 92 3200 90.3 8 24.8 37.6 3.1 -3.6
Luxfer 100 3300 99.3 8 26.21 40.86 3.11 -4.34
Catalina C100 3300 100 8 27.3 46.1 -0.4 -7.8
Copyright 1999, 2004 and 2010 Huron Scuba, Snorkel and Adventure Travel, Inc.

 

STEEL CYLINDERS*
Manufacturer & Nominal Capacity Service pressure, psi Actual air capacity, cu. Ft. (at +10%) Outer diameter, in Length without valve, in Empty weight, lbs Buoyancy Empty, lbs (w/valve) Buoyancy Full, lbs (w/valve)
OMS 13 2400 +10% 13 3.9 14 5.9 -2.25 -3.31
OMS 20 2400 +10% 20 3.9 19.5 7.5 -1.5 -3
Heiser 45 2400 +10% 45 5.5 25.79 20.3 0.8 -2.575
PST LP 45 2400 +10% 45 5.5 23 19 -0.5 -3.7
OMS 45 2400 +10% 46 5.5 23 17.6 0 -4
OMS 50 2400 +10% 50 5.5 25.2 19.92 -1.5 -4.8
OMS 66 2400 +10% 66 7 21 25 -1.67 -5.15
PST 65 3500 67 7.25 16.75 26.2 -1.5 -6.4
PST MP 72 3300 72 6.9 20.75 30 -6 -11.4
Faber 72 3000+10% 72 6.75 20.5 28.7 -3.7 -8.45
Faber 80 2400 +10% 78 7.25 24 30 -1.7 -7.55
Faber 80 3180 +10% 80 7.25 19.88 32.5 -7.22 -13.22
PST E7-80 3442 PSI 80 7.25 20 28 -2.5 -8.5
PST LP-80 2400 +10% 80.6 7.25 24 34 -1 -7
PST 80 3500 82 7.25 19.75 28.6 -3.3 -9.3
OMS 85 2400 +10% 85 7 26 31 0 -6.7
Faber 95 2400 +10% 95 8 23.8 37.2 -1.2 -8.325
PST 95 2400 +10% 96.6 8 24.75 43.8 -3.3 -10.4
OMS 98 2400 +10% 98 8 24 38 0 -7.73
Faber 100 3180 +10% 100 7.25 24.01 38.7 -7.26 -14.76
PST E7-100 3442 PSI 100 7.25 24.12 33 -1 -8.5
PST 100 3500 102 7.25 23.94 34.1 -1.3 -8.8
Heiser 104 2400 +10% 104 8 27.36 47.4 -7.46 -15.26
PST 104 2400 +10% 106.2 8 26.88 46.4 -3.3 -11.27
OMS 108 (112) 2400 +10% 112 8 26 41 -1 -8
PST E8-119 3442 PSI 119 8 24 41 -2 -10.5
Heiser 120 3190 120 8.03 25.8 55 -17.82 -26.4
Faber 120 3180 +10% 120 7.25 28.64 48.3 -7.22 -16.22
PST E7-120 3442 PSI 120 7.25 28.25 38 0 -10.5
PST 120 3500 122.5 7.25 27.87 39.2 -1.3 -10.3
PST 120 2400 +10% 122.5 8 29.37 51.3 -1.7 -10.7
OMS 121 (125) 2400 +10% 125 8 29 45 0 -9.5
PST E8-130 3442 PSI 130 8 26.12 43 -1 -10.5
OMS 135 (131) 2400 +10% 131 8 30.7 47 0.75 -10.31
Heiser 140 3190 140 8.03 29.9 63 -18.04 -28.4
E8-149 3442 PSI 149 8 29.37 47.5 -1.7 -12.8
Heiser 190 4400 190 8.03 31.3 87 -46.86 -62.3
Copyright 1999, 2004 and 2010 Huron Scuba, Snorkel and Adventure Travel, Inc.

*Empty weights do not include valves (except Pressed Steel and OMS), which would add 1.5 – 2.5 lbs, but buoyancy figures do.