Dimension Specifications for a Scuba Tank

Scuba tanks are available in a variety of sizes. They are used for different purposes by divers with different needs, from small cylinders for children, to large steel cylinders for a technical diver needing as much air as possible.

  1. Height

    • Tanks are available in heights from 17 to 30 inches. Care should be taken with longer tanks where they are attached to the BCD (Buoyancy control device) to avoid hitting the diver's head in the valve if the tank is positioned too high.

    Diameter

    • Diameter is much more of a concern for divers in order that they can attach the tanks to their BCD. Most tanks have a common diameter of 7.25 inches; however 8-inch tanks are also available for holding higher air capacities.

    Capacity

    • Air capacity of the tank depends on the length, the diameter and the tank structure material (for how much gas the tank can hold when pumped to pressure).

    Material

    • Material of the tank (steel or aluminum) can affect the dimensions because it influences how strong the tank is. Strength affects how much air can be pumped into the tank, and therefore its size requirements.

    Considerations

    • For selection of a tank's dimensions, the diver should consider what she will be using it for--as a primary course of air, or as a spare air "pony" bottle. She should also consider her air consumption.