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Offshore Drilling and Production Platforms/Units
Published in Sukumar Laik, Offshore Petroleum Drilling and Production, 2018
Compliant towers (Figure 3.26) are designed to have considerable ‘mass’ and ‘buoyancy’ in their upper regions and as a result they have a sluggish response to any forces because its mass and stiffness characteristics are tuned such that its natural period would be much greater than the period of waves in the extreme design environment. The typical 10–15 second cycle wave passes normally through the structural frame without any response just as water reeds behave when waves pass through them. In fact, an early version of compliant towers was named Roseau, meaning reed in French.
Fossil Energy Sources
Published in Anco S. Blazev, Power Generation and the Environment, 2021
Compliant Towers consist of a narrow tower attached to a foundation on the seafloor and extending up to the platform. The support tower is flexible, however, vs. the rigid legs of a fixed platform. The flexibility of the support system allows the rig to operate in deep water, since it is capable of “absorbing” surface waves and currents, and yet it is strong enough to withstand even hurricanes.
Introduction to Offshore
Published in Surender Kumar, Dynamic Positioning for Engineers, 2020
Compliant towers are offshore structures which consist of a flexible tower which is connected and supported by a piled foundation. The tower generally supports structures used for drilling and production operations. Compliant tower structures can withstand significant forces and are generally used up to depths 500 metres.
Offshore oil and gas records circa 2020
Published in Ships and Offshore Structures, 2022
The world’s tallest offshore structure is the 2001-ft tall Petronius27 compliant tower set in 1754-ft water depth in the U.S. Gulf of Mexico (Figure 33). As the name suggests, the structure is compliant in the sense that it does not attempt to resist all environmental lateral forces through the piling alone. Instead, the structure is designed to permit limited movement with the waves. Compliant towers require less steel (strength) in construction and their foundation bases do not expand28 with increasing water depth like fixed platforms. The tower design is more flexible than conventional fixed platforms and can deflect (sway) about 2% of its height.29