Scuba tanks are a basic component of any scuba diver's kit. While they contain no air, they do contain a large volume of free gas, which is generally greater than the amount of water they can hold. 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. Here 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 of dive gas, has a ten to twenty-percent lower capacity than air. A higher maximum operating pressure doesn’t necessarily mean that there is more air. Although manufacturers overestimate the tank's capacity, they often do so. 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 a different mix of gases than recreational divers. As such, their true air or Trimix capacities are lower than their actual waters capacities. Because Helium is less compressible then air, the true air and trimix capacities of technical divers are smaller than their actual water capacities. Heliair 10/50's true air capacity is 216ft3 while double HP117 cylinders hold a true volume air volume at 235ft3. To determine the correct mixed gas capacity, use the Z Factors for SCUBA tables.
They can be made of aluminum or steel
You should consider the divers' needs when choosing between an aluminium or steel scuba tanks. Steel tanks are stronger and can withstand deep dives. This durability comes with a price. Aluminum tanks can easily develop structural fractures which can lead to serious injury. A steel tank is more expensive than an aluminum tank. But, aluminum tanks are now the industry standard.
They are available in different sizes
Two materials can be used to build a scuba tank: aluminum and steel. Steel tanks are lighter than aluminum and can last for longer. They also 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 are lighter than steel tanks. You will need to consider your weight requirements when purchasing an aluminum tank. Steel tanks are great for drysuit diving and local scuba diving.
They must be inspected often
There are many ways you can check your scuba tank. Hydrostatic testing is usually stamped into the metal beneath the neck of the tank. A visual inspection can also help you find 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. It is possible that the tank is rattling or needs to be cleaned.