Aluminum and steel scuba tank diving cylinder Aluminum scuba tank diving cylinder steel scuba tank diving cylinder scuba tank diving cylinder

       Scuba tank (diving cylinder) typically have an internal volume of between 3 and 18 litres and a maximum pressure rating of 200 bar to 300 bar, (about 3000 psi to 4500 psi). The internal cylinder volume is also expressed as "water capacity" - the volume of water which could be contained by the cylinder. When pressurised, a cylinder carries a volume of gas greater than its water capacity because gas is compressible. 696 (3 x 232) litres (25ft³) of gas at atmospheric pressure can be compressed into a 3-litre cylinder filled to 232 bar. Cylinders also come in smaller sizes, such as 0.2, 1.5 and 2 litres, however these are not generally used for breathing, instead being used for purposes such as surface marker buoy, drysuit and buoyancy compensator inflation.

       Scuba divers may carry one scuba tank (diving cylinder) or multiples, depending on the requirements of the dive. In parts of the world where scuba diving takes place in warm water and in good visibility, recreational scuba divers usually carry only one scuba tank (diving cylinder). An example of this type is coral reef diving where it is possible to do an interesting dive without going deep or needing long decompression. Where diving risks are higher, for example in parts of the world where the water is cold and visibility is low or when recreational divers do deeper or decompression diving, divers routinely carry more than one gas source. An example of this type is north European diving where the temperature is often less than 15°C/60°F and visibility less than 10m/33ft and many interesting dive sites are shipwrecks in deeper water on the sea bed.

       Scuba tank (diving cylinder) is more often used colloquially by non-professionals and native speakers of American English. The term "oxygen tank" is commonly used by non-divers when referring to diving cylinders. This is a misnomer. These cylinders typically contain (atmospheric) breathing air, or an oxygen-enriched air mix. They rarely contain pure oxygen, except when used for rebreather diving, decompression in technical diving or for oxygen therapy.

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