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SPARs have 4 major components: a hull (fig. 2.23), a mooring
system, risers, and topside decks (fig. 2.24). SPAR designs are
inherently stable due to their deep draft hulls. Dry Tree technology
can be utilized on a SPAR platform. SPAR platforms tend to be
30% cheaper than other options in deep water.

Figure 2.23 – Building Hull SPAR

Figure 2.24 – Building topside deck SPAR
Truss Platforms were introduced by Kerr-McGee in 2001
when the Nansen was installed in the Gulf of Mexico. The Truss
SPAR design has 3 main components (fig. 2.25):
1. Hard Tank – provides most of the in-place buoyancy for
the SPAR. 2. Truss Section – supports the heave plates and
provides separation between the keel tank and hard tank. 3. Keel

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