A Study of On Board Maintenance of Ship and Dry Dock Operations Schedule

Abstract

Due to the rise in yen exchange rate, dry docking has been usually done outside Japan in order to save the docking budget. Dockyard works other than hull cleaning and paintings, cleaning sea chest and sea valves, propeller polish, etc. are carried out as voyage repairs, which achieve a considerable reduction in the docking costs. Instead, most ship-masters are requested to carry out on board maintenance (OBM) with the ship's crew. In the present paper, docking operations are scheduled in order to cope with increasing OBM jobs. The critical path method (CPM) is applied to the dry docking schedule of the training ship "TOKAI-DAIGAKU MARU II", the following results are obtained : 1. The project scheduling techniques including PERT and CPM methods can be applied successfully to reduce the duration and manpower of docking operations. 2. Spare and/or repair parts should be applied according to the OBM schedule since more and more jobs are going to be carried out on board. 3. The life-cycle cost concept has to be established in order to keep the ship cost-effective within the constraints specified by operational and maintenance requirements.