For crane ships, the DP-2 lifting operation mode is the most critical operation mode for crane ships. Especially the this article introduces and analyzes the electrical design of the 3 000 t full revolving floating crane vessel. It firstly analyzes the characteristics of its electrical system design, mainly including the application of the power distribution system architecture, the dynamic positioning (DP-2) system and the anchor mooring positioning system on the crane vessel. The electrical design of the full revolving floating crane vessel is deduced based on the FMEA report. A design scheme that meets the requirements of navigation and operation, and the solutions for some important problems have been proposed according to the particularity of this crane ship. The similarities and differences between this crane ship and the previous crane ships are analyzed to provide reference for the electrical system design of this type of subsequent ships. It is also hoped to provide the more in-depth discussions and the better optimization schemes for the electrical design of the offshore engineering crane ships.

An improved technology of the fire and gas detection and emergency system is presented in terms of the shortcomings of the common design for the fire and gas detection system (FGS) and the emergency shutdown (ESD) system with the requirement of the regional fire and gas shutdown by using the modular design ideas, in order to effectively enhance the reliability and safety of the Floating Production Storage and Offloading (FPSO). The emergency system can be shut down in case of accident to protect the safety of the personnel and facilities of the platform with the minimized accident losses. This scheme optimizes the range of the action of the shutdown switch with the different levels by analyzing the shutdown strategy of the emergency system based on the importance of the location of the hazard point sources. It can reduce the equipment shutdown, increase the platform output, and enhance the effectiveness and success of the emergency system in managing emergency accidents for the implementation of cost reduction and efficiency increase, while ensuring the safety of personnel and platforms.