浮力材料の効力について(日本航海学会第19回講演会)

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As buoyant materials of life-saving appliances aboard, we have been using Balsa, Cork and Kapok because of their characteristics remaining buoyancy for a long time in the water. And, some of Plastic foam are adopted for them by recent technical progress. However, buoyant force of these materials, one of fundamental abilities not only as materials but also as appliances, is tested in fresh water internationally. Tests carried out at Durban by the Society of Master Mariners on March 11, 1957, reported that kapok-filled life jackets sank in oily-petrol, light diesel oil-water in short time. Authors wanted to test and examine more the force remaining buoyancy of buoyant materials in oily water and oil, which might have been out of question in deciding their fitness for practical use heretofore. Therefore we have researched influences of Petrol, Gas Oil and Fuel Oil to Kapok, Cork, Balsa and Polystyrene foam by model-tests etc., at the first step of the investigation. The conclusions to which authors have come as a result of above tests are: a) Kapok is much affected on buoyancy by Petrol and Gas Oil, while more or less by Fuel Oil. b) Polystyrene foam has no durability to Petrol. c) Cork and Balsa are almost not affected by these oils, etc. And, thinking of danger of lives at the sea casualties, especially of that in oil tankers, we should decide their fitness of life-saving appliances by tests not only in water but also in oil hereafter.
社団法人日本航海学会の論文
1958-09-30

浮力材料の効力について(日本航海学会第19回講演会)

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