60:(s) supporting a deck. Spars are permanently anchored to the seabed by a spread mooring system composed of either a chain-wire-chain or chain-polyester-chain configuration. The cylinder comprises a number of tanks; the lowest contains ballast, mid-water and/or extracted oil, the upper, air for buoyancy. Helical strakes are fitted to larger & more recent designs to mitigate the effects of vortex-induced motion.
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The first, and thus far unique, cell-spar platform was Kerr-McGee's Red Hawk spar (7 ea. 8 m (26 ft) diameter cells). Field-depletion occurred 4 years after production started, so Red Hawk was decommissioned in 2014 under the
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A classic spar consists of a tall-height, cylindrical hull, with tanks for heavy ballast located at the bottom of the cylinder.
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A cell spar consists of a cluster of small-diameter cylinders and relatively speaking, cheap to manufacture.
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Offshore
Magazine "State-of-the-art of spread moored systems for deepwater floating production platforms"
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attempted deep sea disposal of the platform in the 1990s created a massive environmental backlash by
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A truss spar comprises three parts, a short-height, large-diameter cylindrical hull, atop a
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The first spar platform designed for production was the
Neptune spar, located in the
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Cylinders are either buoyancy only, or subdivided into buoyancy and ballast.
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There are three primary types of spars; classic, truss, and cell:
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A spar platform consists of a large-diameter, vertical buoyant
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www.fmctechnologies.com "Annual Report - Glossary of Terms"
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Marine structure used for floating oil/gas platforms
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249:"UPDATE 1-Shell starts production at Perdido"
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226:"Cell spar enables Red Hawk development"
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