In this text, the system takes the hull of the 82000 DWT bulk carrier as the research object, this system analyses the common methods and existing shortcomings or problems of the existing hull rust removal methods. In view of the shortcomings or problems of these methods, the design requirements of the hull rust removal system are set out. Based on AutoCAD design platform, a high-pressure water jet rust removal system is designed, its working principle and main components are introduced, and the main parts of the system are selected for calculation.

The existing dismantling and fitting tool of the lead sleeve in fuel injection pump in the laboratory is taken as the research object, aiming at its shortcomings or problems like the limited scope of application, the laborious operation, the hidden danger of personnel injury and so on. Starting from the design requirements of the special tool for the dismantling and fitting of the lead sleeve in the marine fuel injection pump, a special tool for disassembling and assembling of the lead sleeve of the injection pump is designed by using the graphic design software AutoCAD2014, and the working principle and the main components of the tool are introduced. Finally, from the aspects of technique, operation, maintenance, economy and so on, the feasibility of the special tool for the dismantling and fitting of the lead sleeve in the fuel injection pump was taken analyzed.