Scuba tanks are an essential component of any scuba diver’s equipment. 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. Below are the main types, as well as their sizes.
scuba tanks contain no air
The standard aluminum 80 can holds 77 feet3 air. Trimix is a type of dive fuel that has a lower capacity than air. It can hold between ten and twenty percent more. A higher maximum service pressure does not necessarily mean more air. Although manufacturers often exaggerate their tanks' capacity. You should therefore compare the capacity of each cylindrical against the actual volume.
They contain a volume of free gas greater than their water capacity
Technical divers use different mixture gases than recreational divers. The true air and trimix capacities of technical divers are smaller than their actual water capacity. Helium, for instance, is much more compressible that air. Therefore, their true air capacity and Trimix capacity are less than their water capacities. Double HP117 cylinders contain a true air volume of 235 ft3 while Heliair 10/50 has a true air capacity of 216 ft3. To determine the correct mixed gas capacity, use the Z Factors for SCUBA tables.
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 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. But aluminum tanks are now the industry standard.
You can get them in many sizes.
Scuba tanks are made from steel or aluminum. Steel tanks are lighter than aluminum and can last for longer. They also tend to weigh more. An aluminum tank is better if you are planning to do a lot more diving and bring a weight belt. However, aluminum tanks are not as lightweight as steel tanks, so you should be aware of your weight requirements before purchasing one. Steel tanks are great for drysuit diving and local scuba diving.
They must be inspected often
There are many ways to inspect your scuba tank. Hydrostatic testing usually is done below 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. Tumbling involves filling the tank in with media and spinning the tank for a specified period to remove dirt and contaminants. If the tank's sound is unusual, it might be an indication that it needs to get cleaned.