Scuba tanks should be a part of every diver's kit. They do not contain air but they do have large amounts of free gas. The tank size will vary depending on what type of diving you do. You'll need to select the right tank based upon the water type you intend to use. Below are the main types and sizes of scuba tanks.
scuba tanks contain no air
The standard aluminum 80 cylinder can hold 77 feet3 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. However, manufacturers tend to exaggerate the tanks' capacities. 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 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. Heliair 10/50 is true to its air capacity at 216 ft3 while Double HP117 has an air volume equivalent to 235 ft3. To determine the correct mixed gas capacity, use the Z Factors for SCUBA tables.
They are made out of steel and aluminum
When choosing between a steel and an aluminum scuba tank, consider which is more suitable for a divers' needs. Steel tanks can withstand deeper dives and are more durable. This durability comes at a price. Aluminum tanks can experience structural fractures faster and can pose a danger. In addition, a steel tank costs more than an aluminum one. But aluminum tanks are now the industry standard.
They are available at different sizes
Scuba tanks can be made from two materials: aluminum or steel. Steel tanks tend to be lighter and more durable than aluminum, but they are heavier. 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 work well for drysuit and local diving.
They should be checked regularly
There are many options for checking your scuba diving tank. Hydrostatic testing can be done under the tank's neck. 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. If the tank's sound is unusual, it might be an indication that it needs to get cleaned.