By SUBRATA K. CHAKRABARTI
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Extra info for Handbook of Offshore Engineering vol1
This record-breaking structure was followed by other platforms including Cerveza and Cerveza Liguera (935 ft,/285 m), Pompano (1290 ft/393 m) and the current record holder Bullwinkle Platform. The single piece Bullwinkle jacket weighs 49,375 tons and was installed at a site with 1350 ft (412 m) water depth in 1988. The initial deck weight for Bullwinkle was 2033 tons. Four thousand tons were added in 1996 to accommodate more production. 000 tons. 3 Gravity Base Structures Offshore structures that are placed on the seafloor and held in place by their weight are called gravity structures.
It performs similar to the other Spars, but it is constructed differently. The hull consists of multiple ring-stiffened tubes, or “cells”, which are connected by horizontal and vertical plates. This method of construction is cheaper than the traditional plate and frame methods. Because of the length of a Spar, the Spar hull cannot be towed upright. Therefore, it is towed offshore on its side, ballasted to a vertical attitude and then anchored in place. The topside is not taken with the hull and is mated offshore once the Spar is in place at its site.
As of this writing there are 13 Spars in production or under construction. 16 shows the progression of Spars built by Technip Offshore, Inc. Three additional Spars have been built by J. Ray McDermott. The first three production Spars consisted of a long cylindrical outer shell with “hard tanks” near the top to provide buoyancy. 16 Progression of Spars (Technip Offshore) the lower section consisted of “soft tanks” which were only used to allow horizontal flotation of the Spar during installation, and for holding fixed ballast, if necessary.
Handbook of Offshore Engineering vol1 by SUBRATA K. CHAKRABARTI