Scuba tanks are a basic component of any scuba diver's kit. Scuba tanks do not contain any air. However, they contain large volumes of free gas. This gas is typically greater than the water they can hold. Tank sizes vary according to the type of diving you'll be doing, and you'll want to choose the right one based on the type of water you plan to go in. 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. Although manufacturers overestimate the tank's capacity, they often do so. Therefore, it is important to compare each cylinder's capacity with the actual volume of air inside.
They are capable of storing more free gas that their water capacities.
Technical divers use mixed gases differently to recreational divers. Their true air and Trimix capacities, however, are lower than their actual water capacities. 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. You can use the Z Factors of SCUBA tables to determine the correct mixed gases capacity.
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 diving. However, this durability comes with a price. Aluminum tanks can easily develop structural fractures which can lead to serious injury. In addition, a steel tank costs more than an aluminum one. But, aluminum tanks are now the industry standard.
You can get them in many sizes.
Two materials can be used to build a scuba tank: aluminum and 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 checked regularly
There are several ways to check your scuba tank. Hydrostatic testing usually is done below the tank's neck. An inspection visually can help you detect corrosion or contamination. Tumbling can be used to test the condition of your tank. Tumbling involves filling the tank in with media and spinning the tank for a specified period to remove dirt and contaminants. If the tank sounds rattly, it may mean it needs to be cleaned.