Scuba tanks are an essential component of any scuba diver’s equipment. Although they are not air-filled, they do hold a large amount of gas. 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 can holds 77 feet3 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 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 are able to store more free gas than they can hold in water.
Technical divers use different mixed gases than recreational divers, and their true air and Trimix capacities are less than their actual water capacities. Because Helium is less compressible then air, the true air and trimix capacities of technical divers are smaller than their actual 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 can be made from steel or aluminum
If you are faced with the choice between an aluminum and a steel scuba tank, make sure to consider what is best for your needs. Steel tanks are more robust and can withstand deeper underwater dives. But, durability comes at a cost. Aluminum tanks can easily develop structural fractures which can lead to serious injury. A steel tank can also be more expensive than an aluminium one. Aluminum tanks are the industry standard.
They are available in various sizes
Scuba tanks can be made from two materials: aluminum or steel. 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. You should know that aluminum tanks can be heavier than steel tanks and are therefore lighter than steel tanks. Steel tanks are great for drysuit diving and local scuba diving.
They must be inspected often
There are many ways you can check your scuba tank. Hydrostatic testing usually is done below the tank's neck. You can also inspect the tank visually to detect corrosion and contamination. Tumbling is another way to check the condition of your tank. Tumbling involves filling the tank with media and spinning it for a time to get rid of dirt and other contaminants. It may be necessary to clean the tank if it sounds rough.