Scuba tanks are a basic component of any scuba diver's kit. Although they are not air-filled, they do hold a large amount of 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, as well as 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. Similarly, a higher maximum service pressure doesn't necessarily mean more air. However, manufacturers tend to exaggerate the tanks' capacities. 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 a different mix of gases than recreational divers. As such, their true air or Trimix capacities are lower than their actual waters capacities. Helium, for instance, is much more compressible that air. Therefore, their true air capacity and Trimix capacity are less than their water capacities. Heliair 10/50, on the other hand, has a true volume of 216 ft3 and Double HP117 cylinders a volume of 235ft3. The Z Factors for SCUBA Tables can be used to determine the correct mixed-gas capacity.
They can be made from steel or aluminum
It is important to decide which scuba tank is better for divers. Steel tanks are stronger and can withstand deep dives. However, this durability comes with a price. Aluminum tanks can experience structural fractures faster and can pose a danger. A steel tank is more expensive than an aluminum tank. But, aluminum tanks are now the industry standard.
They come in a variety of sizes
Scuba tanks can be made from two materials: aluminum or steel. Steel tanks are lighter, more durable and heavier than aluminum tanks. However, they tend to be heavier. A lightweight aluminum tank might be the best option if you intend to dive a lot or 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 ideal for drysuit diving or local scuba diving.
They should be inspected frequently
There are several ways to check your scuba tank. Hydrostatic testing is usually stamped into the metal beneath the neck of the tank. Visual inspections can be used to help detect corrosion or contamination. Tumbling is another method to inspect 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. It is possible that the tank is rattling or needs to be cleaned.