The word "scuba" is actually an acronym; the letters stand for "self-contained underwater breathing apparatus." The most important element of scuba diving is a ready supply of oxygen, which is delivered via an aluminum or stainless steel air tank that the diver wears. Before each dive, you should check your tank to ensure it's free from damage and will deliver adequate oxygen during the dive.
Tank Straps
The air tank is attached to the breathing control device, called the BCD, which is a vestlike garment all divers wear. It inflates and deflates as needed to control the diver’s depth and secures various instruments, such as the tank pressure gauges. A thick strap about 2 inches wide secures the tank, which is attached to the BCD. Make sure the strap is secured and not frayed and that the tank is not too high on your back; otherwise, you'll hit it with your head. The diving website Know Dive recommends fastening the strap about one fist below the external markings on the top of the tank.
Air Content and Regulator
Knows Dive states that your air tank should contain about 300 PSI of oxygen when you start a dive. Turn the tank valve completely to the “on” position. Take two or three breaths from the regulator. If the needle moves, something is wrong. Make sure the tank valve is open all the way, and check the regulator to ensure it is not defective. When you breathe air from the tank, it should taste slightly rubbery. Any other tastes and smells could indicate the air is contaminated, and you should not use the tank.
Evidence of Inspections
TheScubaGuide.com explains that air tanks should be visually inspected every year to detect corrosion or other damage. If the tank passes inspection, an evidence of inspection, or EOI, sticker will be applied to it. Check to ensure the EOI sticker is not more than a year old. If it is, ask for another tank.
Special testing facilities perform hydrostatic inspection of a tank every five years. This checks the tank’s ability to contain the highly pressurized oxygen it's filled with. Each tank will be stamped with a hydro test stamp; make sure it's not more than 5 years old.
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