|Publisher||Offshore Technology Conference||Language||English|
|Content Type||Conference Paper|
|Title||Installation of the Horn Mountain Spar Using the Enhanced DCV Balder|
|Authors||Cees Dijkhuizen, Ton Coppens and Peter van der Graaf, Heerema Marine Contractors B.V.|
Offshore Technology Conference, 5 May-8 May 2003, Houston, Texas
|Copyright||2003. Offshore Technology Conference|
During the second quarter of 2002 Heerema Marine Contractors (HMC) installed the Horn Mountain Dry Tree Spar facility [ref.1], using its recently enhanced Deepwater Construction Vessel (DCV) Balder. This paper describes the most important issues of this marine installation project, including methodologies specifically developed to suit the capabilities of DCV Balder. Such features include the Worlds largest diameter Mooring Line Deployment winch and the dual crane lifting of the Spar Deck.
In the late nineties of the last century major oil companies, driven by portfolio considerations and the depletion of their easily accessible reservoirs, extended their exploration activities more and more into deeper water offshore areas. As a specialized marine contractor, in order to adapt to these and future needs of operators, HMC's strategy to approach this market was based on:
Features of the DCV Balder such as the Dynamic Positioning (DP) system, the 1050mT capacity J-lay system and the world's largest Mooring Line Deployment winch, the Crane traction deepwater lowering winches in combination with its existing large heavy lifting capacity results in the following main benefits:
Recently completed projects include the pre-lay of the Nakika FPS Moorings and installation of the BP Horn Mountain Spar. The use of DCV Balder enhanced capabilities, the revised working practices adopted by HMC and HMC's Quality, Environment, Safety and Health (QESH) Management System applied on BP Horn Mountain project will be described in this paper.
DCV BALDER CAPABILITIES
DCV Balder (Fig.1) was built as Semi-Submersible Crane Vessel (SSCV) in 1978 and underwent an extensive life time extension and conversion program in 2001 [ref.2, 3, and 4]. The characteristics of the vessel are shown in table 1.
Of prime importance for deepwater installation is the Dynamic Positioning (DP) capability. The DCV Balder was equipped in 2001 with seven new 3500 kW thrusters resulting in a total thrust capability of 350mT, allowing the vessel to keep position in more than 40 knot winds in DP Class 3 condition and to hold large horizontal pipelay tensions.
|File Size||1,992 KB||13|