Scuba tanks are an essential component of any scuba diver’s equipment. They do not contain air but they do have large amounts of free gas. 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. Below are the main types and sizes of scuba tanks.
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. A higher maximum operating pressure doesn’t necessarily mean that there is more air. However, manufacturers are known to overstate the capacity of their tanks. Therefore, it is important to compare each cylinder's capacity with the actual volume of air inside.
They have more gas than water and contain more free gas.
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. Heliair 10/50 is true to its air capacity at 216 ft3 while Double HP117 has an air volume equivalent to 235 ft3. The Z Factors for SCUBA Tables can be used to determine the correct mixed-gas 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 durable and can withstand deeper dives. This durability comes with a price. Aluminum tanks are more susceptible to structural fractures and can prove dangerous. A steel tank can also be more expensive than an aluminium one. But aluminum tanks are now the industry standard.
You can get them in many sizes.
Scuba tanks are made of two materials: steel and aluminum. Steel tanks are lighter and last longer, but heavier. 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. However, aluminum tanks are not as lightweight as steel tanks, so you should be aware of your weight requirements before purchasing one. Steel tanks can be used for local and drysuit diving.
They should be checked regularly
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 way to check the condition of your tank. Tumbling involves filling it with media and spinning it for a certain period of time to remove dirt and other contaminants. If the tank sounds rattly, it may mean it needs to be cleaned.