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Tether system for an offshore based work platform
| Details |
Inventors: Williamsson, Robert;
Assignee: Gotaverken Arendal AB (Goteborg, SE)
Primary Examiner: Taylor; Dennis L.
Assistant Examiner: Ricci; John
Attorney, Agent or Firm: Wegner, Cantor, Mueller & Player
A tether system for a semisubmersible work platform which may be based on deep water, comprising a number of pontoon elements mounted in a frame configuration, upright columns and a work deck for exploitation of oil or gas fields below the sea bottom. The system comprises a sea bed anchor template, which is provided with receptacle means for tendons, running up to connectors at the work platform. The receptacle means in the sea bed anchor template are located along a circular track on which a carrier can move. The carrier has sheave means for one or more handling line for a tendon which is provided with a running collar. The connectors for the upper ends of said tendons are located at the outside of the columns. |
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DETAILED DESCRIPTION One object of the invention is to provide a tether system which simplifies the handling of both ends of each tendon, and thus reduces the above described drawbacks.
For this object, the tether system according to the invention is characterized in that the receptacle means in the sea bed anchor template are located along a circular track on which a carrier can be displaced, said carrier having sheave means for one or more handling lines for a tendon which is provided with a running collar, and wherein the connectors for the upper ends of said tendons are located at the outside of the columns.
The guidance of the upper and lower ends of the tendons will be achieved by simple means because of this design of the tether system.
According to one preferable embodiment of the invention, the upper end of each tendon is flexibly connected to a ballastable float element.
Since the tendons reach up along the platform columns, the float element can form a vertical cylindrical buoy which is accessible at the sea surface during the installation, said shape being preferable in order to minimise influence from wave induced motions.
The connectors for the upper ends of the tendons preferably comprise lower connector means for absorbtion of angle variations in the longitudinal direction of the tendons, said lower connector means being located at the lower ends of the columns, and upper connector means which are located above the operational water line of the platform for absorbtion of vertical load.
In this way, bending is avoided between the lower edge of each column and the respective tendon.
Also, the loads are distributed along the columns and maximum availability is obtained.
Preferably, each upper and lower connector means is provided with a slit formed opening enabling radial entrance of the float element into the upper connector and axial entrance of said float element into said lower connector.
The upper connector means preferably comprises hydraulic press means which can be applied against the tendons during installation of the work platform, enabling a temporary arrest of the platform in relation to the tendons, during any of the lower turning points in the heave amplitude of said platform
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