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. There are many sizes that can be used for different types of diving. It is important to pick the right tank according to what kind of water you will be using. Listed below are the main types of scuba tanks and their sizes.
scuba tanks contain no air
The aluminum 80 standard cylinder holds 77 ft3 air. Trimix, which is a type diving gas, has a 10 to 20% lower capacity than air. Similarly, a higher maximum service pressure doesn't necessarily mean more air. Although manufacturers often exaggerate their tanks' capacity. You should therefore compare the capacity of each cylindrical against the actual volume.
They have a greater volume of free gas than their water capacity
Technical divers use different mixed gases than recreational divers, and their true air and Trimix capacities are less than their actual water capacities. Helium, which is more compressible and less elastic than air, means that their true air or Trimix capacities will be smaller than their water capabilities. Heliair 10/50, on the other hand, has a true volume of 216 ft3 and Double HP117 cylinders a volume of 235ft3. Use the Z Factors to determine the correct mixed gas capability.
They can be made of aluminum or steel
Consider the needs of divers when choosing between an aluminum or steel scuba tank. Steel tanks are stronger and can withstand deep dives. This durability comes with 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. However, aluminum tanks have become the industry standard.
They are available at different sizes
Scuba tanks are made from steel or aluminum. Steel tanks are lighter and last longer, but heavier. An aluminum tank may be better if you plan to dive frequently and need to carry 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 are great for drysuit diving and local scuba diving.
They need to be inspected on a regular basis
There are many methods to test your scuba tanks. 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 your tank sounds noisy, it could be a sign that it needs cleaning.