Scuba tanks make up a fundamental part 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. 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. Here are the main types of Scuba Tanks and their sizes.
scuba tanks contain no air
The standard aluminum 80 can holds 77 feet3 air. Trimix, a type of dive gas, has a ten to twenty-percent lower capacity than air. Similarly, a higher maximum service pressure doesn't necessarily mean more air. However, manufacturers are known to overstate the capacity of their tanks. You should therefore compare the capacity of each cylindrical against the actual volume.
They have more gas than water and contain more free gas.
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. 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. To determine the correct mixed gas capacity, use the Z Factors for SCUBA tables.
They are made of steel or aluminum
You should consider the divers' needs when choosing between an aluminium or steel scuba tanks. Steel tanks are stronger and can withstand deep dives. However, this durability comes with a price. Aluminum tanks can easily develop structural fractures which can lead to serious injury. Additionally, an aluminum tank will cost more than a steel one. But, aluminum tanks are now the industry standard.
They are available in various sizes
Two materials are used to make scuba tanks: aluminum and steel. Steel tanks are lighter than aluminum and can last for longer. They also tend to weigh more. If you plan on doing a lot of diving and plan to bring a weight belt, it might be best to go with an aluminum tank. But aluminum tanks are heavier than steel tanks. Before purchasing an aluminum tank, you need to be aware of your weight requirements. Steel tanks can be used for local and drysuit diving.
They should be inspected frequently
There are many options for checking your scuba diving tank. Hydrostatic testing can be done under the tank's neck. You can also inspect the tank visually to detect corrosion and contamination. Tumbling is another option to assess the condition and health of your tank. 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.