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Here the various types of floating structures and their types are discussed. 1 Floating Platform Types The floating structures may be grouped as Neutrally Buoyant and Positively Buoyant. The neutrally buoyant structures include Spars, Semi-submersible MODUS and FPSs, Ship-shaped FPSOs and Drillships. Examples of positively buoyant structures are TLPs, TLWPs and Buoyant Towers. Floating platform functions may be grouped by their use as mobile drilling-type or production type. 5 as of 2003. There is little standardisation of floater units.

SeaStar is a small TLP with a single surface-piercing column (fig. 20). The column is necked down near the sea surface to reduce surface loads on the structure. ) The submerged hull spreads into three structural members at the bottom in a triangular fashion, which are used to support and separate taut tubular steel tendons. The hull provides sufficient buoyancy to support the deck, facilities and flexible risers. The excess buoyancy provides tendon pretension. SeaStar is generally towed or barged to site in a vertical position.

19) was introduced by ExxonMobil on its Kizomba A field in 2003. This concept has four columns on a closer spacing than normal, ring pontoons and pontoon extensions cantilevered to support the tendons on a wide moment arm [Huang, et al, 20001. Tension Leg Platform technology preserves many of the operational advantages of a fixed platform while reducing the cost of production in water depths up to about 4900 ft or 1500 m. Its production and maintenance operations are similar to those of fixed platforms.

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