An Estimation of The Number of Onboard
Maintenance Personnel of Ships Associated
with Dry Docking Operations Schedule
Tatehiko MIKI *, Shizuo TAKEMOTO **,
Takeshi HASHIMOTO *** and Hiioshi NISHIMURA ****
ABSTRACT
Since the organization maintenance at dockyards is getting more
expensive in Japan, ship's crew are usually involved with the maintenance and repair of
equipment as well as its operation and use. However, maintenance activities have been
normally limited to periodic checks of equipment performance, visual inspections, cleaning
of equipment, and the removal and replacement of some components because of the lack of
manpower and equipment complexity.
In this paper , the authors made a basic study on the application of
logistics and field service concepts to ship maintenance. A simulation model was also
coded in SLAM II language to analyze how many maintenance personnel should be provided on
board. The maintenance concepts were revealed to be developed in conjunction with the
operational requirements basing upon the ship's functional analysis and ship's personnel.
Due to the rise in yen exchange rate, dry docking is usually done
outside Japan in order to stay within the docking budget. Additionally, during dry docking
of the ship, dockyard works other than hull cleaning and paintings, cleaning sea chest and
sea valves, propeller polish, etc. are to be carried out as voyage repairs, which achieve
a considerable reduction in docking costs. Resultantly, most ship masters are requested to
carry out onboard maintenance(OBM) with the ship's crew.
In the paper, authors also deal with the scheduling of docking
operations associated with increasing OBM works. The critical path method was 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 is
successfully applied to reduce the duration and manpower of docking operations.
2. Maintenance crew should be provided according to the OBM schedule
since more and more works are going to be carried out onboard.
3. The life-cycle cost concept has to be established in order to keep
the ship cost- effective within the operational and maintenance requirements.
KEYWORDS
(on board maintenance, logistics, field service, life- cycle cost,
system simulation
* Professor, BS, MSIE, DrENG, Kobe University of Mercantile Marine
** Lecturer and former captain, BE, Tokai University
*** Professor, BS, DrENG, Kobe University of Mercantile Marine
