Assessment of docking operation during float-over installation on jacket structure

Abstract

In this study, docking operation during float-over installation on jacket structure is investigated. Docking is a very sensitive operation, as the allowed motion responses of DTV(Deck Transportation Vessel) are strictly limited for successful operation when DTV enters slot of jacket to install Topsides on the jacket structure by float-over. Therefore, it is important to assess DTV's motion responses accurately for the designed configuration with mooring lines and fenders in combined environmental conditions. Assessments of docking operation using the commercial software, ANSYS AQWA, were carried out for various environmental conditions, after a series of validations through the comparisons with previous results of analysis and model test. Results of parametric studies are presented in the paper, which are to show the effects of gap between DTV and fender, fender stiffness, mooring line stiffness and random seed for realization of irregular waves. Copyright ？ 2018 by the International Society of Offshore and Polar Engineers (ISOPE)