Extending the range of liftable jackets
In recent years heavy lift vessels have been successfully used for the installation of deep water jackets. In the Gulf of Mexico in particular there is a tradition to install jacket structures in varying water depths with different techniques. In most cases however, the substructure concepts for deep water in the Gulf are still based on launch jackets or the launch of jacket sections. The moderate environmental conditions and topsides weights in the Gulf make it economically attractive to design light jacket structures for water depth in excess of 200 m. To be able to use the available lift potential of the heavy lift vessels more effectively for the deep water region of the Gulf, new concepts are becoming available. This paper will discuss these concepts as already applied like the two piece jacket concept and the underleg pile concept whereby the use of large mudmats is avoided by installing the jacket on pre-installed support piles. Finally the installation concept for very long one piece jackets is discussed based on the principle of multibody lifting. An example is the use of two heavy lift vessels simultaneously.
- OSTI ID:
- 485080
- Report Number(s):
- CONF-970146--; ISBN 1-890277-02-9
- Country of Publication:
- United States
- Language:
- English
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