Abstract：Considering the important role of dynamic positioning (DP) capability analysis in ship design, DP capability of deepwater semi-submersible crane and pipe-laying vessel is analyzed. Environmental loads in operation condition are calculated with software calculation results corrected by wind tunnel test coefficients of the same type vessel. According to the selected thruster configuration and failure mode, DP capability of 14 conditions is calculated, and the DP capability plots are shown. The results show that the thruster configuration is reasonable to meet the design conditions.
