Patent attributes
An underground storage tank for the containment of liquids such as gasoline or water is comprised of a cylindrical body with ribs provided about the circumference of the body. The ribs have a cross-section in the nature of a rectangular sine wave. By providing lower ribs, no greater than one half-inch in height above the surface of the cylindrical body, and as much as five or six inches in breath, strength is maintained with a reduction in the amount of material used. The rib may be strengthened against crushing forces by providing linear material of high modulus, such as graphite or carbon fiber, in the upper portion of the rib. The resulting tank can be built to take advantage or recent changes in transportation regulations and may extend up to eight and one half feet, providing for more economical tank manufacture from source to installation.
