船舶機関部潤滑油溜タンク内油面動揺の調査とその防止対策

概要

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Under severe conditions of high seas, the ship rolls seriously with a maximum roll of 30° to 40°, in some cases. We have experienced some troubles that introduction of air from the suction pipe of lubricating oil pump has happened by heavy fluctuation of oil level in the lubricating oil sump tank built integrally with the ship's double bottom. The authors carried out some model experiments with a 1/10 scale model of sump tank having usual construction (not so long in longitudinal length, shallow and having longitudinal and transverse girders inside for strengthening) and a fluctuating mechanism of pendulum type, so as to find the oil level fluctuation similar to the actual ship. After carrying out a theoretical analysis in parallel with the model test, the authors were able to find the condition of oil level fluctuation in the sump tank by calculation. It is possible to proceed with the design based upon the calculation in the following procedures, so as to obtain the design of lubricating oil suction system sufficiently safe fer the ship's rolling. (1) To decide the size of compartment devided with girders and oil passage on the girders in the tank. (2) To keep the maximum distance between the oil level and the pump suction mouth, so far as available with the usual construction of sump tank.
1960-11-05