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• W2080247589 abstract "Abstract This paper deals with the development of the dynamic positioning equipment for the drillship which is now under construction at a yard of I.H.C. Holland and which is expected to enter world-wide service by December 1971. The paper describes the philosophy of the design, the main components of the system and the results of model tests and their impact on the development of the control system. Preliminary conclusions are given with respect to performance in relation to water-depth. Introduction The constantly increasing demand for oil has for a considerable time now focussed the attention of oil companies and contractors to offshore exploration and exploitation. Step by step the operations are moving farther and farther offshore, entering deeper water. In this progress the designers of equipment have to work in close co-operation with the people in the field arid the theorists, for optimum adaptation of their equipment to the state of art and the demands of the operators. One very specific requirement for all offshore drilling equipment is that the equipment, ship or platform, barge or semi-submersible, should be capable of retaining a stationary position at sea. This requirement is often supplemented by the requirement of great mobility, so as to minimize the loss of time between two drillings. These two requirements, coupled with the requirement of world-wide service in water-depths ranging between 50 and 300 metres and over, have led to the design of the drill-ship PELICAN, which is at present under construction at one of the yards of I.H.C. Holland in the Netherlands. The ship is being built for the French offshore contractor Somaser, a company which was founded 1t years ago by Foramer, CNP and Doris. The principal dimensions of the ship are as follows:Overall length149.32mBreadth21.35mDraught7.32mDepth 12.50mDisplacement 15420 tonTrial speed14 knotsInstalled power17000 h.p. The outline of the ship is given in fig. 1. Among the numerous applications of modern developments on board of this ship, the most outstanding feature is the dynamic positioning system. What is Dynamic Positioning? Dynamic Positioning is the technique of maintaining the position of a vessel, barge or floating platform by means of thrust. A craft equipped with a D.P. system is independent of anchors or other conventional aids for remaining stationary in open water. Instead, it employs -in addition to apparatus for measuring its position with a high degree of accuracy-propellers capable of exerting thrust in controlled directions and a system for activating propellers to rectify deviations from a predetermined position. The underlying principle is not new of course. It has earlier counterparts in automatic pilots which maintain course as opposed to P9sition, and in the depth keeping systems of submarines." @default.
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• W2080247589 date "1971-04-18" @default.
• W2080247589 modified "2023-10-05" @default.
• W2080247589 title "Development of Dynamic Positioning for IHC Drill Ship" @default.
• W2080247589 doi "https://doi.org/10.4043/1498-ms" @default.
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