Statical Analysis of Deep Sea Mooring Lines Considering Current Effect

Abstract

Previously authors made a reseach work about statical analysis of mooring lines and effects of sea bed condition on it. In this paper, we extended the computer program which was made at that time and made it possible to calculate three-dimensional configuration of mooring line in the presence of a current forces which varies both in magnitude and direction with depth. Using this computer program, some numerical results of mooring performances are resented. From that we made cosideration, especially in case of deep sea mooring, for some parameters such as magnitude, direction and profile of current attacking on the line, line's extention, line's scope (line's length/water depth) and kind of mooring line. Further we made a rough design of moorings about water depth of 1,000 meters class semi-submersible rig and discussed about the effects of sea current and line's extention on it.