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Article type: Cover
Pages
Cover1-
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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Article type: Cover
Pages
Cover2-
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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Ichiro NAKAMURA, Yoichi HATTORI
Article type: Article
Pages
1-11
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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Recently bulk carriers adopting alternate loadings have come to be built extensively. In these cases their double bottoms suffer strong force compared with those of the ordinary cargo ships. As to the design of their double bottom structures, any general method taking this fact into account has not yet been established. So we present here a practical method for them. Conclusions obtained are as follows : 1. Height of double bottom is to be the minimum value required by the rule. 2. Slope of hopper top is to be 45゜ against horizontal surface. 3. Breadth of hopper is to be so set as to make the stress of double bottom below allowable value. 4. A structure so designed as to satisfy the above items will give minimum weight and nearly maximum hold capacity.
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Masaaki KANAYAMA, Kazue IINO, Yooichi SATO
Article type: Article
Pages
12-14
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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Steady work quantity in a manufacturing shop is highly desirable for the production control. But we could not avoid the fluctuation in the actual schedule even if we could make a plan matched for the capacities of man-power and equipments. Disagreement between the preliminary schedule and the practical program is usually adjusted by overtime work. Having noticed a necessity to clear up its actual situation, viewed from health control and other angles, we made some investigations into overtime work in the manufacturing shop. The object of our investigation is to give counsel to apportionment of personnels and of their total overtime hours. We are able to make a more practical overtime planning by this investigation than in the past.
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Shojiro OKADA, Hiroyuki SUNADA
Article type: Article
Pages
15-23
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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The present report relates to the results obtained in an experiment concerning the energy loss in branching and joining flows of various ventilating trunks for ships. In the experiment, fifteen different kinds of trunks were used. By the experiment the effects of changes in the wind velocity, of the flow ratio, of the area ratio and branching shapes have been elucidated. At the same time, the reason for the improvement or deterioration of the performances of several kinds of the trunks with various branching mechanisms has been definitely traced through the observation of water-flow models. As a result of the experiments, it has been made clear that the trunk of type A (a rectangular branching) indicates a far superior performance than any of the trunks tested, while, on the other hand, that the trunk of type E (an inflected branching) has the most inferior performance.
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Atsuo FUKUGAKI
Article type: Article
Pages
24-33
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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Heat balance calculation in a marine steam plant was done by a high speed digital computor IBM 7090 to find out the optimum feed water temperature which will minimize the fuel oil consumption rate. The plant employed in this example is a typical 18,000 PS plant with a generator load of 550 kW and secondary steam requirement of 675 kg/h. Calculations were made for each combination of three different steam conditions and three different steam cycles. We found that not only the final temperature of feed water but also the stagewise rise of the total feed water temperature have great effect on the fuel economy. The results presented here will serve as a guide for the design engineers to determine the feed water temperatures of multi-stage regenerative steam cycles. As our future task will be assigned a far more important and even more difficult problem as to plant parameters which will find out the minimum operating cost of a ship. A digital computor program which incorporates operating cost calculations together with heat balance calculations should be developed.
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Kenichiro TANAKA, Soichi OKADA, Katsuhiko HIGUCHI
Article type: Article
Pages
34-36
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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This paper informs about the shipowner's aim and the operating experiences in the modernized power plant in the M.S. TACOMA MARU built in June 1962. Before the practical designing, we took up the study about crew's working hours and kinds in the engine room of ordinary vessels, and caught the fact that most of the crew's working hours were expended in watching and inspecting the machineries. Therefore we have decided to place a central controlling station at the reasonable position in the engine room where it is possible to manoeuvre the main engine and to watch remotely the running conditions of the vital motors. We have widely adopted the automatic controlling systems in every part of the power plant. Now it is found that the modernization, in our vessel, has shown its effective usefulness in the practical operations.
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Junzo ITO, Hiroshi SUITA
Article type: Article
Pages
37-40
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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In spite of the purpose of pumping up crude oil, it is an established practice to design capacity of cargo oil pumps to be installed onboard oil tankers on the basis of handling sea water, and to guarantee the capacity by executing necessary shop test by means of sea water. Concerning the following points, we have been able to make investigation on conditions of pumps running while discharging crude oil : (a) What is actual crude oil discharging capacity of a cargo oil pump which passed capacity test at shop by means of sea water ? (b) What method is to be adopted for the purpose of reducing cargo oil handling hours of tankers ? We are, therefore, pleased to submit a report of the investigations made on an oil tanker and hope that the report will be help for better selection of cargo oil pumps.
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Ryohei YAMADA, Shogo OMURA
Article type: Article
Pages
41-46
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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According to the research concerning pumping work and inclination of automation on cargo-handling equipment of oil tankers, this paper made clear that any automatic device must prevent pumps from cavitation in cargo-handling. Cavitation in pumping, as well known, can be prevented if only the following inequality is satisfied : available-N.P.S.H.>required-N.P.S.H. +l/g((dv)/(dt)). Taking suction pressure as available-N.P.S.H., which is a function of suction pressure, velocity head and vapour pressure of the liquid, velocity head naturally makes allowance for the value. Therefore, the pumps can be run without causing cavitation by controlling the rotation and capacity of the pumps in response to the suction pressure computed from oil level and suction friction loss. The ORION MARU delivered to O.S.K. is equipped with such automatic devices as to satisfy the abovestated principle in order to nationalize cargo-handling. The equipment with low suction pressure trip and emergency manual trip carries out cargo-handling work with a steam turbine speed governor in combination with the suction pressure control device. By shop-test, the equipment is certified to be quite fitted to required-N.P.S.H. according to the variation of suction pressure.
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[in Japanese]
Article type: Article
Pages
47-49
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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Article type: Appendix
Pages
50-52
Published: April 30, 1963
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Article type: Appendix
Pages
App1-
Published: April 30, 1963
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Article type: Appendix
Pages
App2-
Published: April 30, 1963
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Article type: Appendix
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Published: April 30, 1963
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Article type: Appendix
Pages
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Published: April 30, 1963
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Article type: Appendix
Pages
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Published: April 30, 1963
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Article type: Appendix
Pages
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Published: April 30, 1963
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Article type: Appendix
Pages
App7-
Published: April 30, 1963
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Article type: Appendix
Pages
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Published: April 30, 1963
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Article type: Cover
Pages
Cover3-
Published: April 30, 1963
Released on J-STAGE: February 24, 2018
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