When used to store potable water they are of a size suitable to act as a service reservoir for a local community they have a roof to prevent contamination of the water. Water is also sometimes stored in cylindrical steel tanks. The tanks are flat bottomed and are provided with a roof which is of conical or domed shape. DESIGN OF WELDED CYLINDRICAL TANKS 1.1 General Oil and oil products are most commonly stored in cylindrical steel tanks at atmospheric pressure or at low pressure. This lecture explains the design basis for the structural elements of cylindrical tanks and illustrates the arrangements and the key details involved. The tank is normally provided with a flat steel plated bottom which sits on a prepared foundation, and with a fixed roof attached to the top of the shell wall.
The principal structural element of these tanks is a vertical steel cylinder, or shell, which is made by welding together a series of rectangular plates and which restrains the hydrostatic pressures by hoop tension forces. RELATED LECTURES Lecture 8.6 : Introduction to Shell Structures Lecture 8.8 : Design of Unstiffened Cylinders SUMMARY Welded cylindrical tanks are commonly used to store oil products or water. It covers the design of vertical cylindrical tanks, and reference is made to the British Standard BS 2654 and to the American Petroleum Industry Standard API650. Previous | Next | Contents ESDEP WG 15 STRUCTURAL SYSTEMS: MISCELLANEOUS Lecture 15C.1: Design of Tanks for the Storage of Oil and Water OBJECTIVE/SCOPE: The lecture describes the basic principles used in the design of tanks for the storage of oil or water.
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