In What Sizes Are Oxygen Tanks Available?


Quick Answer

Oxygen tanks for water sports hold between 50 to 150 cubic feet of air. Diving tanks come with different pressure ratings.

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Full Answer

Oxygen tanks for scuba diving are high pressure cylinders containing compressed gas. There are three pressure ratings, which are measured in pounds per square inch (psi):

  • Low: 2,400 to 2,640
  • Standard: 3,000
  • High: 3,000 to 3,500

There are also specialty high-pressure steel tanks that require a Department of Transportation (DOT) permit. Tanks are identified by prefixes. For example, aluminum tanks are labeled with the prefix "AL," low-pressure steel tanks are labeled "LP" and high-pressure steel tanks are labeled "HP." Recreational divers often use tanks with a capacity of between 50 to 100 cubic feet of air, while many rental tanks typically hold 80. Pony tanks, which hold up to 40 cubic feet, are used as a back-up air supply.

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