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An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate. It consists of an open- topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. The roof rises and falls with the liquid level in the tank. [1]
Tanks built below ground level are sometimes used and referred to as underground storage tanks (USTs). Reservoirs can be covered, in which case they may be called covered or underground storage tanks or reservoirs. Covered water tanks are common in urban areas. Tanks can be mounted on a lorry or an articulated lorry trailer.
Racking board (#15) is the catwalk along the side of the derrick (usually about 35 or 40 feet above the "floor"). The monkey board is where the derrick man works while "tripping" pipe. Mud motor (not pictured) is a hydraulically powered device positioned just above the drill bit used to spin the bit independently from the rest of the drill string.
Floating roof tanks are generally used for more volatile products to reduce evaporation loss. Fixed roof tanks have a vapor space above the product, which breathes in or out as the product is removed or the tank is filled. Some tanks may be fitted with internal heating coils using hot water or steam to keep the contents warm.
Each tank has a storage capacity of approximately 12.5 million gallons. The Red Hill tanks are connected to three gravity-fed pipelines that run 2.5 miles inside a tunnel to fueling piers at Pearl Harbor. Each of the 20 tanks at Red Hill measures 100 feet in diameter and is 250 feet in height. [5]
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