| 摘要 |
PROBLEM TO BE SOLVED: To prevent corrosion without applying a rust preventive paint to the upper part of a tank bulkhead by suppressing the temperature of the upper part of a cargo oil tank of a tanker to the specific value or less. SOLUTION: A pump 4 is installed in an engine room 3 of a tanker 1, and a cooling water pipe 7 having sprinkler holes 6 is disposed in the longitudinal direction of a hull, near the center on an upper deck. The pump 4 and the cooling water pipe 7 are connected by a pipeline 8. Sea water or fresh water is sprinkled from the sprinkler holes 6 of the cooling water pipe 7 to flow down on the upper deck so as to restrain the temperature of the upper part of a cargo oil tank at 30 deg.C or less. Evaporation of steam and other volatile components evaporated from oil in the tank is therefore suppressed to restain a corrosion phenomenon of a bulkhead part generated when these volatile components are cooled to a dew point or lower at the bulkhead part above the oil level of the cargo oil tank at night and become water drops to adhere to the bulkhead part. The installation of the cooling water pipe 7 at the center part of the upper deck is convenient to sprinkle cooling water to flow down. Since the upper deck is invariably provided with the down-grade from the center part toward both sides.
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