Scuba tanks make up a fundamental part of any scuba diver’s kit. Although they are not air-filled, they do hold a large amount of gas. Different types of diving require different tank sizes. Therefore, you need to make sure you choose the right tank for you based on what water you are going to be using. Below are the main types, as well as their sizes.
scuba tanks contain no air
The standard aluminum 80 cylinder has a capacity of 77 ft3 of air. Trimix, which is a type diving gas, has a 10 to 20% lower capacity than air. Also, higher maximum service pressures don't necessarily equal more air. Although manufacturers often exaggerate their tanks' capacity. Hence, you should compare the capacity of each cylinder against the actual volume of air in it.
They have more gas than water and contain more free gas.
Technical divers use a different mix of gases than recreational divers. As such, their true air or Trimix capacities are lower than their actual waters 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. Use the Z Factors to determine the correct mixed gas capability.
They are made of steel or aluminum
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 are more robust and can withstand deeper underwater dives. This durability comes at a price. Aluminum tanks are more susceptible to structural fractures and can prove dangerous. A steel tank is more expensive than an aluminum tank. But aluminum tanks are now the industry standard.
They are available at different sizes
Scuba tanks are made from steel or aluminum. Steel tanks are lighter and last longer, but heavier. If you plan on doing a lot of diving and plan to bring a weight belt, it might be best to go with an aluminum tank. 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 are ideal for drysuit diving or local scuba diving.
They must be inspected regularly
There are many ways to inspect your scuba tank. Hydrostatic testing is often done beneath the neck of a tank. A visual inspection is also a good way to find any corrosion or contamination. Tumbling can be used to test the condition of your tank. To remove dirt, debris and other contaminants, you can tumble the tank by filling it with media. If your tank sounds noisy, it could be a sign that it needs cleaning.