MAINTENANCE ASPECTS OF FLOATING MOORINGS IN GREENLAND

The inspection and monitoring system for the maintenance of the 12 floating mooring systems installed along the west coast of Greenland is presented in this paper. The mooring systems at Paamiut/Frederikshab and Narsaq have been selected for more than detailed description and presentation of findings. Procedures for the determination of the actual strength of the mooring arrangement at Paamiut are presented together with results concerning the trends in the combined effects of corrosion and wear and tear. Single elements with degradation faster than the general trend are depicted. For the mooring arrangement at Narsaq, the presentation has been concentrated on the failure of some of the riser chains and the cause thereof. The possibilities of hydrogen induced failure or failure resulting from defects, arising from the manufacturing process are being discussed.