Scuba tanks should be a part of every diver's kit. Although they are not air-filled, they do hold a large amount of gas. The size of a tank will depend on what type and type of diving it is. Below is a list of the most common scuba tanks, along with their sizes.
scuba tanks contain no air
The standard aluminum 80 cylinder has a capacity of 77 ft3 of air. Trimix is a type of dive fuel that has a lower capacity than air. It can hold between ten and twenty percent more. The same goes for air. A higher maximum pressure doesn't necessarily indicate more air. Manufacturers tend to overstate their tanks' capacity, though. Therefore, it is important to compare each cylinder's capacity with the actual volume of air inside.
They have a greater volume of free gas than their water capacity
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 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 can be made from steel or aluminum
When choosing between a steel and an aluminum scuba tank, consider which is more suitable for a divers' needs. Steel tanks are more durable and can withstand deeper dives. This durability comes at 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
Scuba tanks can be made from two materials: aluminum or steel. Steel tanks are lighter and last longer, but heavier. Aluminum tanks are better for those who plan on diving a lot and have 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 ways to inspect 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 is another way of checking the tank's condition. Tumbling involves filling your tank with media, and then spinning it for a period of time to remove any dirt or other contaminants. If the tank sounds rattly, it may mean it needs to be cleaned.