Model Experiments on the Mooring of Large Tanker to Offshore Dolphin-I : in case of strong wind, without waves

Abstract

This model experiment was carried out by means of the experimental water tank with windtunnel at Tokyo University of Mercantile Marine. Objects of this study are to get some basic knowledges for developing more suitable mooring methods. Cases and conditions of experiments are as follows: -model ship: 2.00m model of Japan Margarett (D.W. 242, 000t) scale 1/150 ship's condition: Normal ballast and half load condition even keel wind velocity: 25m/sec and 35m/sec in actual ship, but without wave. wind direction: every 30° in all round, 0° is head wind. mooring arrangement: A type conventional type, made up with fore and aft lines and spring lines B type New type, made up with breast lines and spring lines water depth: 21m in actual ship Some results of this experiment are as follows. 1) Without waves, it may be possible to moor large tanker to offshore dolphin in strong wind less than 35m/sec. 2) We can not recognize necessarily that the conventional mooring method is the mostsuitable method. In this experiment, the new method is more suitable than the conventional one. 3) In concern with tensions on mooring lines and loads on dolphins, measured values in experiments are nearly correspond to theoretically calculated values in statical analysis.