PLATFORMS
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structure and to minimize leg pénétration into the soil. The height of the
platform above the seafloor, up to 100 m, may be adjusted by using motor
drives attached to each leg.
Figure 1.3 A jacket-template platform (courtesy of IHI Co. Ltd., Japan).
A platform designed to be used in a fixed location as a production unit
is shown in Figure 1.1b. Such a unit, called a gravity platform, consists of a
cluster of concrète oil-storage tanks surrounding hollow, tapered concrète legs
that extend above the water line to support a Steel deck. See Graff and Chen
(1981). A typical unit, of which there were 28 operating in the North Sea in
1999, has one to four legs and rests directly on a concrète mat on the sea floor.
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structure and to minimize leg pénétration into the soil. The height of the
platform above the seafloor, up to 100 m, may be adjusted by using motor
drives attached to each leg.
Figure 1.3 A jacket-template platform (courtesy of IHI Co. Ltd., Japan).
A platform designed to be used in a fixed location as a production unit
is shown in Figure 1.1b. Such a unit, called a gravity platform, consists of a
cluster of concrète oil-storage tanks surrounding hollow, tapered concrète legs
that extend above the water line to support a Steel deck. See Graff and Chen
(1981). A typical unit, of which there were 28 operating in the North Sea in
1999, has one to four legs and rests directly on a concrète mat on the sea floor.