Extending the Use of Conventional Construction Technology for the Installation of Subsea Production Facilities in Deep Water

Abstract

It is clear that the offshore industry is striving to develop fields in deeper and deeper water and that subsea production is a key element in this development. This then leads to the question of what is the most efficient method of installing subsea production equipment in very deep water. This paper will address the issues associated with using conventional lifting technology based on steel wire rope for deep water applications. The new deep water construction ships being brought into operation have conventional lifting equipment based on steel wire rope. The requirement to be able to handle loads in excess of 300 t in great water depths leads to the need for large diameter multi-strand ropes with low spin characteristics. The long term behaviour of these ropes particularly in applications which require the use of heave compensator is uncertain due to the lack of any suitable test data. This paper will describe a full scale testing program to determine the fatigue performance of large diameter steel wire rope, including the design and building of a new testing machine, together with a summary of the results and the impact the results have on installation operations.

Modeling and Dynamic Analysis of the Xijiang FPSO Mooring System

“…As shown in Figure 3 below, each mooring leg is made up from the following components: (1) .High holding power marine drag anchor (2).1000 m of 124 mm (4⅞ ins) diameter galvanized six stranded wire rope (3).45 m (approx.) 108 mm (4¼ ins) diameter stud link chain (4).200 m of 120 mm (4¾ ins) diameter stud link chain (approx.…”

“…The FPSO is held on station with by a dis-connectable Buoyant Turret Mooring (BTM) consisting of a submerged mooring buoy tethered by eight catenary anchor legs. The mooring system, which is attached to the FPSO via a dis-connectable Buoyant Turret Mooring (BTM) consists of 8 legs each comprising: (1).Drag anchor; (2).1000m of 124 mm diameter 6x36 strand wire rope; (3).Variable length (approx. 25m) of 108 mm diameter chain; (4).200m of 120 mm diameter chain; (5).90m of 102 mm diameter spiral strand wire rope; (6).10.2m of 108 mm diameter chain connected to the chain stopper on the BMT.…”

Mission-oriented Modular Control of Retrofittable Marine Power Plants

“…STATE-OF-THE-ART IN MARINE POWER PLANT CONTROL 2 a) Platform supply vessel from DNV GL [44](b) Anchor handling tug supply vessel 'MMA Centurion'[45] (c) Offshore construction vessel 'Polar Queen'[46] …”