Oscillation suppression and control system for floating platform

A floating platform and oscillation frequency technology, applied in the direction of reducing ship motion through displacement, can solve problems such as reducing the effective bearing capacity of the platform system, the weight of the anchor bar system, and increasing the cost of the anchor bar

Inactive Publication Date: 2011-05-11
SEAHORSE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increasing requirement for steel to have larger cross-sectional areas and longer lengths in deeper waters has resulted in heavier anchor tendon systems, thereby increasing the cost of the anchor tendons and reducing the profitable load-carrying capacity of the platform system , that is, more and more platform costs (buoyancy) are almost all used in its own mooring system

Method used

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  • Oscillation suppression and control system for floating platform
  • Oscillation suppression and control system for floating platform
  • Oscillation suppression and control system for floating platform

Examples

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Embodiment Construction

[0022] see now figure 1 , shown in the figure is a single-column shell-type floating platform generally indicated by reference number 10 . The floating platform 10 includes a column or hull member 14 projecting above the water surface 16 on which a platform deck 15 is supported. The float 18 extends radially outward from the base of the housing 14 . The floating platform 10 is anchored to the seabed by tendons.

[0023] In a typical anchor bar design, steel bars are used to secure the floating platform 10 to the seafloor. As the exploration and production of oil deposits extends into deeper waters, the design of the anchor bar system becomes more critical and begins to dominate the cost of the platform. The anchor tendon system must be designed to operate between allowable minimum and maximum tensions to dampen inherent resonant motion and limit fatigue damage from each stress cycle. The latter two are usually achieved by increasing the cross-sectional area of ​​the bar, w...

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PUM

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Abstract

In accordance with the present invention, an oscillation suppression system is provided to inhibit vertical and rotational resonance of a floating platform. The oscillation suppression system includes energy absorption chambers mounted in or about the hull of the floating platform. The chambers may be separately attached or integrated as part of the structure. The chambers are comprised of gas inan upper portion, and water mass in a lower portion. The chambers are closed or partially vented at the upper ends and open at their bottom ends. The enclosed gas in the upper portion of the chamber acts as a gas spring reacting against the floating platform and the water mass. The suppression of resonant oscillations of the floating platform system is accomplished through the gas-spring pressurechanges acting on the floating platform system in phase opposition to external forces.

Description

technical field [0001] The invention relates to a resonant oscillation suppression system for offshore floating platforms. Background technique [0002] A tension leg platform (TLP) is a floating platform that is kept positioned at sea by means of vertical mooring elements called anchor tendons, usually made of high-strength high-quality steel pipes, and also includes a lower anchor tendon system Bending moments and stresses in the top and bottom joints (anchor joints). In designing the anchor system so that the TLP can be safely held in place, many factors must be considered, including: (a) during severe storm conditions and when the TLP is under failure conditions, the Limitation of stresses developed; (b) avoiding any relaxation of the anchor tendon as the troughs and crests pass through the TLP shell and avoiding subsequent snap loading or disconnection; (c) throughout the entire use of the anchor tendon system Life, the tolerance for fatigue damage in the anchor tendo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B39/03
CPCB63B39/03
Inventor 史蒂文·J·莱弗里特迈克尔·W·斯皮兰奥里奥尔·R·赖肯史蒂芬·E·基比
Owner SEAHORSE EQUIP
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