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. 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, a type of dive gas, has a ten to twenty-percent lower capacity than air. A higher maximum service pressure does not necessarily mean more air. Although manufacturers overestimate the tank's capacity, they often do so. It is therefore important to check the capacity of each individual cylinder against the actual volume.
They contain a volume of free gas greater than their water capacity
Technical divers use mixed gases differently to recreational divers. Their true air and Trimix capacities, however, are lower than their actual water capacities. 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. Use the Z Factors to determine the correct mixed gas capability.
They can be made of aluminum or steel
When choosing between a steel and an aluminum scuba tank, consider which is more suitable for a divers' needs. Steel tanks are stronger and can withstand deep dives. However, this durability comes with a price. Aluminum tanks can quickly develop structural cracks, which can be dangerous. Additionally, an aluminum tank will cost more than a steel one. 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 and last longer, but heavier. A lightweight aluminum tank might be the best option if you intend to dive a lot or bring a weight belt. Aluminum tanks are lighter than steel tanks. You will need to consider your weight requirements when purchasing an aluminum tank. Steel tanks can be used for local and drysuit diving.
They should be inspected frequently
There are many ways to inspect your scuba tank. Hydrostatic testing usually is done below the tank's neck. Visual inspections can be used to help detect corrosion or contamination. Tumbling is another method to inspect 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's sound is unusual, it might be an indication that it needs to get cleaned.