Maurice Storey is President of the Institute of Marine Engineering, Science and Technology (IMarEST) and underlines the close collaboration between JIME and IMarEST by presenting a special lecture at ISME 2005. This paper discusses the experiences of Maurice Storey throughout his 50 year career.

View full abstract

The shipping industry keeps growing about 3 to 5 % per year. This tells us the number of ships increases quickly, at the same time, numbers of fresh crew join into shipping industry. Simplification and Standardization of ship's equipment is becoming an uppermost need.
To respond this growing world trade, ships need to be supplied more efficiently than today. For this, key words are also Standardization and Simplification.

View full abstract

Today, 1350 ship collision incidents occur in Japan in one year. This means that four collisions occur every day. Thesecases not only risked the loss of human life, but also developed into serious oil spills. Oil spill from ships can cause veryserious on the financial and environmental damage, as well.
Causes of these incidents are investigated and it is usually concluded, from the psychological and medical viewpoints, tobe operator error. After those incidents, it is very important to perform research for developing and improving safetydevices or systems and for understanding recurrence of incidents. An Event Tree Analysis method of compoundingmaritime incidents, especially those including oil spill and casualties after a collision is introduced.

View full abstract

It is generally believed that lubricating Oil (LO) of heat engines blackens mainly due to soot.However, the authors' previous study shows that LO is blackened also in gas engine without soot. That may be due to cracking of LO molecules under high temperature but this is not proved yet. The purpose of this experimental study is to verify whether any LO is blackened without soot not only in heat engines but also in other fields subject to high temperature operating condition.

View full abstract

When a semiconductor film is irradiated by gamma rays, excited electrons are transferred to abase metal in contact with the film, resulting in a drop of corrosion potential. The authors propose a corrosion mitigation method based on radiation induced surface activation (RISA) phenomena by supplying gamma rays from outside the material, or based on a self-excited methodology activating the film and/or the base metal. The corrosion potential of ZrO₂ coated SUS304L was shifted down to the range between -90 mV and -300 mV vs. SSE by gamma-ray irradiation. The corrosion potential was further shifted down to -600 mV when a CoCr intermediate layer was inserted between the ZrO₂ spray coating film and the SUS304L base metal. Iron specimens with a spray coating film of TiO₂, ZrO₂, and Al₂O₃ were immersed in a 3 wt% sodium chloride aqueous solution. Pitting and general corrosion were observed on both the specimens kept in a darkroom and illuminated with ultraviolet rays. Pitting and general corrosion were, however, suppressed on all three specimens irradiated with gamma rays.

View full abstract

A lot of the engine room simulators based on PC have been introduced into the maritime education and training institutes. Therefore, development of an effective educational training methods and evaluation of the effect of education are needed in order to get consolidation of maritime education and training. This paper describes the influence that the learning method and the learning group give to the learning outcomes such as achieved ratio of operational scenario of marine engine plant, number of operation errors and type of errors. Learning by teacher's instructions contributes to the highest percentage of the scenario achievement by the students, and learning by case of textbook is the second highest, and discovery learning is the lowest On the other hand, occurrence number of serious operational errors becomes maximal in discovery leaning. As for the educational effect by the difference of the learning group, pair (two persons) learning is more effective in achieving ratio of the operational scenario than individual learning and group learning, meanwhile group learning shows better performance in the occurrence number of operational errors than others. In addition, it was suggested in all the learning groups that beginners tend to omit some parts of operation procedures as well as to add unnecessary operations.

View full abstract

The Japan Agency for Marine-Earth Science and Technology (JAMSTEC) is planning scientific riser drilling for 4, 000 meters depth class risers in the future by utilizing the riser drilling vessel “Chikyu”. There are many technological problems in order to realize this plan, and it is very important to reduce the self weight for riser pipes in the deep sea. Titanium alloy with high specific intensity is considered to be a potential material of marine riser for the deep sea. Not much is known about the mechanical properties of titanium alloy as it is an industrially new material for marine riser, and in particular fatigue crack propagation properties are not enough.
In this study, by using center notched specimens of Ti-6Al-4V alloy (ASTM Grade 5), fatigue crack propagation tests were carried out under constant amplitude loading in the air, seawater and seawater for charging the cathode potential of -0.8V (vs. SCE) and -1.2V (vs. SCE) on specimens. As a result, it became clear that fatigue crack propagation rate is influenced by the stress ratio and the cathode potential, though Ti-6Al-4V alloy shows a superior corrosion resistance in seawater.

View full abstract

Long towed pipe is used for dilution of CO2 in the moving ship concept of ocean sequestration of CO2. Vortex Induced Vibration (VIV) is expected for the towed inclined pipe. Time marching VIV simulation method was developed and validity of the method was verified. The method is a combination of a data base of VIV hydrodynamic force on the cylinder subjected to harmonic oscillation and a time marching FEM (Finite Element Method) of underwater line structure. VIV force is calculated by CFD (Computational Fluid Dynamics) . A filter which estimates amplitude, frequency and phase of a local response of pipe from the time history of pipe vibration was developed. Using this filter, parameters of local vibration and instantaneous VIV force is evaluated by consulting the data base. The estimated VIV force is applied to the pipe and response of towed pipe is calculated by the FEM. The method was verified by comparison with experimental results carried out in the towing tank. The accuracy of the method is discussed.

View full abstract

The recent trend to increase the efficiency and output of large two-stroke diesel engines raises the lubrication severity of the piston ring and the cylinder liner. The temperature of the cylinder liner also tends to increase, keeping the sulphuric acid above its dew point to reduce corrosive wear. One of the most important issues in this context is to prevent severe wear and scuffing under high temperature conditions. The present study was carried out to find out how scuffing resistance of the cylinder oil could be improved using a pin-on-disk type reciprocative sliding test equipment, in which test conditions of high speed, high temperature and oil starvation were similar to those seen in large diesel engines. The relationship between scuffing resistance and total base number (TBN) of the cylinder oil varies greatly depending on the oil feed rate. Under fully flooded lubrication condition, increasing total base number of the cylinder oil is effective in improving scuffing resistance. Under oil starved lubrication condition, however, the usage of high TBN oil results in low scuffing resistance when compared to low TBN oil because of the inferior oil film spreading of high TBN oil. The usage of an oil spreading improver and a heat resisting dispersant, both which enhance oil film spreading under high temperature condition, as well as an extreme pressure agent was found to raise the scuffing resistance of high TBN oil.

View full abstract