SUGGESTED SEA TRIALS FOR DYNAMICALLY POSITIONED SHIP-SHAPE AND SEMI-SUBMERSIBLE MOBILE OFFSHORE DRILLING UNITS

摘要

The Society of Naval Architects and Marine Engineers (SNAME) published the Guide for Sea Trials Ref in 1989 as an update to the 1973 Code for Sea Trials. Intended for ship shaped vessels, it is useful for general planning purposes, but it lacks the detail specifically for Dynamically Positioned (DP) Mobile Offshore Drilling Units (MODUs). Over the last three years, Diamond Offshore Drilling, Inc. (DODJ) commissioned the DP semi-submersible MODU Ocean Confidence and the DP ship-shaped MODU Ocean Clipper after upgrades to several systems on both vessels including propulsion and the dynamic position control system. This paper will compare and contrast the test plans for the Ocean Confidence and the Ocean Clipper. Based on this experience, the authors would like to suggest a minimum required test plan for sea trials that can be used to commission the two types of DP MODUs.