Scuba tanks are an essential part of every scuba diver’s kit. Although they are not air-filled, they do hold a large amount of gas. Tank sizes vary according to the type of diving you'll be doing, and you'll want to choose the right one based on the type of water you plan to go in. Listed below are the main types of scuba tanks and their sizes.
scuba tanks contain no air
The standard aluminum 80 cylinder has a capacity of 77 ft3 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 are known to overstate the capacity of their tanks. It is therefore important to check the capacity of each individual cylinder against the actual volume.
They are able to store more free gas than they can hold in water.
Technical divers use mixed gases differently to recreational divers. Their true air and Trimix capacities, however, are lower than their actual water capacities. Helium, for example, is less compressible than air, so the true air and Trimix capacities are smaller than their water capacity. Heliair 10/50's true air capacity is 216ft3 while double HP117 cylinders hold a true volume air volume at 235ft3. Use the Z Factors (SCUBA tables) to determine the correct mixed gasoline 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 are more durable, and can withstand deeper diving. This durability comes with a price. Aluminum tanks are more susceptible to structural fractures and can prove dangerous. Additionally, an aluminum tank will cost more than a steel one. But aluminum tanks are now the industry standard.
They are available at different sizes
Two materials are used to make scuba tanks: aluminum and steel. Steel tanks are lighter and more durable, but tend to weigh more. 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 excellent for drysuit diving as well as local scuba divers.
They should be inspected frequently
There are many ways to inspect your scuba tank. Hydrostatic testing is typically done by stamping into the tank's neck. A visual inspection can also help you find corrosion or contamination. Tumbling is another way of checking the tank's condition. 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.