Dynamic Positioning Vessel Failure Modes And Effects Analysis

Dynamic positioning(DP) vessels are, as the name suggests, ships with dynamic positioning systems, which use thrusters to maintain its position (fixed position or a predetermined track).DP vessels are currently used on ocean drilling ships, platform support vessels, diving support vessels, pipes and cable laying vessels, research ships, deep-sea lifeboat etc. Dynamic positioning ships are currently divided into three types, DPI, DP2 and DP3 according to the ships' additional identification grades awarded by classification societies. The requirement for DPI is the lowest and DP3 is the highest.The detection tool, FMEA (Failure Modes and Effects Analysis), applied throughout the DP ships design, construction, testing and operation management, is regarded as a necessary part for the DP ships to join the Classification societies. As the owners realize the importance of the safety of the DP ships, they also put forward higher requirements and challenges for FMEA.This thesis introduces the development process of FMEA and ships FMEA firstly and then it introduces the main contents of FMEA of DP vessels. Secondly, it introduces the information of M7005 and highlights each DP related systems and redundant. And then focuses on the FMEA tables of each DP related system. Analyzing the single failure, the worst case failure and the worst case failure design intent of M7005. Finally, it introduces the preparations of FMEA validation test and the verification test case of FMEA project during sea trials. By the real ship's verification, the report of M7005 and FMEA are completed. And after the delivery of the ship, the entire FMEA interaction process of DP vessel is completed.