Various type of shaft driven generating system has been applied on board to save maintenance cost as well as save fuel cost. The mainstream of such system with large capacity is the one with load commutated inverter system. By adding‘Fault Diagnosis Function’ derived from‘Direct Digital Control’ and‘Graphic Display Function’ utillizing recent micro electronic technology, MTTR (Mean Time To Reopair) has been shortened. We have developed a Direct Digital Controlled Shaft Driven Generating System that adopts above technology first in japan. Aiming increased Reliability, Availability and Serviceability and delivered the first product in Oct. '95.
The marine diasters and accident are not decreased in the past more than ten years in the number of them in spite of their effort who concerned for secure assurance bodies. Those great majorities are caused by collision and grounding by hymanerrors. In this report however, to establish the effective system which capable of safety navigation even if the watch keeping to be done by one-man operator on the bridge thrugh the navigation by supporting functional integrated system instead of human activities. The current technology back ground and latest international regulations are reported in the first part and a layout of bridge equipment and detailes of particuler avanced integrated bridge system to be reported in the second part of this paper.
Low-speed marine diesel engines are operated under severe lubricating conditions with higher output, and their lubrication is an important factor for their successful operation. In order to raise the reliability of the ring-liner lubrication of marine diesel engines, authors conducted the studies on the initial running-in methods of the ring in the stage of shop trial by measuring the oil film electrical resistance between the ring and the liner. This paper describes the feature and its mechanism of the initial running-in of the top ring, and the effective running-in method by the variation of the load to obtain good lubricating condition of the top ring during a shorter time. And it also describes the applicable region of the evaluation method of the ring-liner lubrication by the electric method.
This is to report on the results of the tank and pipe line washing experiment carried out on small chemical tanker of Japan in its actual operation. In the period from January to March 1994, after-discharge washing tests were carried out on a small chemical tanker which had carried Alpha-Methylstyrene and m-Disopropylbenzene. At this time, freshwater washing by using washing machine was conducted at the prescribed number of cycles. Wash water was accomodated in the slop tank through a discharge line and the amount of the wash water was mesured. Samples of this wash water were taken at the manifold in the couse of transfer to the slop tank and the times of sampling were recorded by a stop watch. Concentration of the residual substances in the wash water was mesured in the laboratory and the relation between the amount of the wash water and the residual concentration was graphically shown at every passage of time. In the tests, the required wash procedure was accomplished using a smalll amount of water that calculated by the formular in the International Maritime Organization P & A standard. Using these results, the required average amount of wash water is estimated in the case of the small chemical tankers. In order to decrease the required amount of washwater, it is necessary to decrease the dead spaces in the pipe lines during the washing.