Extended Buoyant Pontoons for Tension Leg Platform Stability
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Solution Overview
Problem
Existing tension leg platforms (TLPs) face stability issues in highly disturbed seas, particularly during adverse weather conditions, leading to potential capsize and damage, as seen during hurricanes like Katrina and Rita, due to inadequate design criteria and structural weaknesses at the transition between radial wings and pontoons.
Innovation Solution
The design extends buoyant pontoons beyond their intersections to create pontoon extension portions, which are coupled with tendons, increasing buoyancy and pitch stability, and structurally intersecting these extensions with adjacent pontoons to enhance stability and reduce failure modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If columns are spaced apart to meet stability design criteria, then pitch stability is improved, but the cost and weight of the structure increase
Solution Approach 1:
The patent extends pontoons in the horizontal dimension beyond the column spacing, creating pontoon extension portions that provide additional stability leverage without requiring increased vertical column spacing. This dimensional extension allows the structure to achieve greater pitch stability while maintaining compact column arrangement, thereby reducing overall structure weight and cost.
2Stability of the object's composition
If columns are spaced apart to meet stability design criteria, then pitch stability is improved, but the cost of the structure increases
Solution Approach 1:
By extending pontoons horizontally beyond column intersections, the invention achieves improved pitch stability through increased lever arm without requiring larger column spacing. This approach uses existing pontoon materials more efficiently and avoids the need for additional heavy structural elements, thereby reducing manufacturing cost while meeting stability criteria.
3Weight of stationary object
If tendon spacing is reduced to decrease structure weight, then structure weight is reduced, but stability in adverse weather conditions deteriorates
Solution Approach 1:
The pontoon extensions project outward beyond the column-tendon arrangement, increasing the horizontal lever arm for stability without requiring additional tendons or increased tendon spacing. This dimensional extension allows the platform to maintain compact tendon spacing for reduced weight while achieving enhanced stability through the extended pontoon geometry that provides greater resistance to overturning moments in adverse weather.
4Stability of the object's composition
If radial wings are added to increase stability, then stability is improved, but structural failure modes increase at the transition between radial wings and pontoons
Solution Approach 1:
Instead of adding separate radial wings that create transition zones, the invention merges the extension directly with the existing pontoon structure. The pontoon extension portions are continuous with the main pontoon body, eliminating discrete transition zones where stress concentrations and failure modes could occur. This integrated design provides enhanced stability while maintaining structural reliability by avoiding weak transition regions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases the TLP's resistance to adverse movements by 10-35% compared to traditional designs, providing enhanced stability during head and quartering storms, and reduces the risk of capsize even if one tendon is lost.
Implementation Method 1
a buoyant pontoon base of the tension leg platform coupled with the column
Implementation Method 2
The extending pontoon increases a buoyancy of the pontoon, increases a pitch stability of the TLP
Data Source
AI summary
The disclosure provides a tension leg platform (“TLP”) with a plurality of buoyant pontoons suitable for highly disturbed seas that can expand the stability of the tension leg platform by extending at least one buoyant pontoon beyond an intersection of two pontoons. In at least one embodiment, the location of the column can be decoupled from the customary end of the pontoon. The tendons can be located at the ends of the pontoons extending beyond the intersection. In some embodiments, such as four-column TLPs, the pontoons can be extended orthogonally relative to an adjacent pontoon. The extending pontoon increases a buoyancy of the pontoon, increases a pitch stability of the TLP, and increases quayside stability. The extended pontoon can be structurally intersected with the adjacent pontoon to strengthen the extended pontoon and reduce the failure mode of such structure.