Scuba tanks are an essential part of every scuba diver’s kit. Although they don't contain air, they have a lot of gas. This is usually more than what they can hold. Different types of diving require different tank sizes. Therefore, you need to make sure you choose the right tank for you based on what water you are going to be using. Here are the main types of Scuba Tanks and their sizes.
scuba tanks contain no air
The standard aluminum 80 cylinder has a capacity of 77 ft3 of air. Trimix, a dive gas, is 10-20% smaller than air. The same goes for air. A higher maximum pressure doesn't necessarily indicate more air. Manufacturers tend to overstate their tanks' capacity, though. It is therefore important to check the capacity of each individual cylinder against the actual volume.
They have a greater volume of free gas than their water capacity
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. 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. To determine the correct mixed gas capacity, use the Z Factors for SCUBA tables.
They are made from aluminum or steel
Consider the needs of divers when choosing between an aluminum or steel scuba tank. Steel tanks are more robust and can withstand deeper underwater dives. This durability comes at a price. Aluminum tanks can quickly develop structural cracks, which can be dangerous. In addition, a steel tank costs more than an aluminum one. However, aluminum tanks have become the industry standard.
They come in a variety of 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. An aluminum tank may be better if you plan to dive frequently and need to carry a weight belt. Aluminum tanks may not be as light as steel tanks so it is important to know your weight requirements before you purchase one. Steel tanks work well for drysuit and local diving.
They should be checked regularly
There are many ways you can check your scuba tank. Hydrostatic testing is often done beneath the neck of a tank. An inspection visually can help you detect corrosion or contamination. Tumbling can be used to test the condition 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. It is possible that the tank is rattling or needs to be cleaned.