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Figure 6.32 – 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. 6.33): 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 Tank (“Soft Tank”) – contains the
fixed ballast and acts as a natural hang-off location for export pipelines and
flowlines .
a b
a – construction; b – transport position
Figure 6.33 – Truss SPAR
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