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. 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, 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. Although manufacturers often exaggerate their tanks' capacity. Therefore, it is important to compare each cylinder's capacity with the actual volume of air inside.
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. For example, Helium is more compressible than air so their true air and trimix capacities are lower than their water capacities. The true air volume of Double HP117 cylinders is 235 ft3, while Heliair 10/50 cylinders have a true capacity of 216 Ft3. Use the Z Factors to determine the correct mixed gas capability.
They are made out of steel and aluminum
Consider the needs of divers when choosing between an aluminum or steel scuba tank. Steel tanks are more durable and can withstand deeper dives. This durability comes at an expense. Aluminum tanks can quickly develop structural cracks, which can be dangerous. A steel tank is more expensive than an aluminum tank. However, aluminum tanks have become 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. But aluminum tanks are heavier than steel tanks. Before purchasing an aluminum tank, you need to be aware of your weight requirements. Steel tanks are ideal for drysuit diving or local scuba diving.
They must be inspected often
There are many options for checking your scuba diving tank. Hydrostatic testing is usually stamped into the metal beneath the neck of the tank. You can also inspect the tank visually to detect corrosion and contamination. Tumbling is another option to assess the condition and health of your tank. Tumbling involves filling it with media and spinning it for a certain period of time to remove dirt and other contaminants. If the tank sounds rattly, it may mean it needs to be cleaned.