Scuba tanks make up a fundamental part of any scuba diver’s kit. Although they don't contain air, they have a lot of gas. This is usually more than what they can hold. There are many sizes that can be used for different types of diving. It is important to pick the right tank according to what kind of water you will be using. Listed below are the main types of scuba tanks and their sizes.
scuba tanks contain no air
Standard aluminum 80 cylinders can hold 77 cubic feet of air. Trimix, a type dive gas, has a capacity of ten to twenty percent less than air. Also, higher maximum service pressures don't necessarily equal more air. However, manufacturers tend to exaggerate the tanks' capacities. You should therefore compare the capacity of each cylindrical against the actual volume.
They are capable of storing more free gas that their water capacities.
Technical divers use different mixed gases than recreational divers, and their true air and Trimix capacities are less than their actual water capacities. For example, Helium is more compressible than air so their true air and trimix capacities are lower than their water capacities. Heliair 10/50 is true to its air capacity at 216 ft3 while Double HP117 has an air volume equivalent to 235 ft3. The Z Factors for SCUBA Tables can be used to determine the correct mixed-gas capacity.
They are made from aluminum or steel
If you are faced with the choice between an aluminum and a steel scuba tank, make sure to consider what is best for your needs. Steel tanks can withstand deeper dives and are more durable. This durability comes at a price. Aluminum tanks can easily develop structural fractures which can lead to serious injury. A steel tank costs more that an aluminum one. Aluminum tanks, however, are now the industry standard.
They are available in various sizes
Two materials are used to make scuba tanks: aluminum and steel. Steel tanks are lighter and more durable, but tend to weigh more. A lightweight aluminum tank might be the best option if you intend to dive a lot or bring a weight belt. Aluminum tanks may not be as light as steel tanks so it is important to know your weight requirements before you purchase one. Steel tanks can be used for local and drysuit diving.
They need to be inspected on a regular basis
There are many ways to inspect your scuba tank. Hydrostatic testing is usually stamped into the metal beneath the neck of the tank. Visual inspections can be used to help detect corrosion or contamination. Tumbling is another method to inspect the tank's condition. Tumbling involves filling the tank with media and spinning it for a time to get rid of dirt and other contaminants. If your tank sounds noisy, it could be a sign that it needs cleaning.