建造後12年目のタンカーの腐食とその修理について
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概要
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Recently, we have made jumbo-conversion works at our yard on four of 12 years old oil tankers. Each was cut into two, aft and fore, and then each old aftbody coupled with a newly-built forebody and each two old forebody jointed together by welding into a oil station barge. When the works were carried out, we found various kinds of corrosion risen inside of oil tanks of the said secound two ships. Having studied them further, we believe we are now in such a position that we can sum up the matter from viewpoint of shapes and causes of corrosive action, and repairs of corrosions as follows. As to the corrosions on bottom plate, (1) We found some were maximum 24.1mmφ of pitted ones and the otherswere average 2.5mmφ of general ones. It is assumed that the degree of progress may depend on the kind of ship, kind of oil tank and part of oil tank. (2) We will be able to point out the oil in tank, the ship's route, the ballast, the butterworth and so forth as the loading factors governing the causes of corrosions. (3) We assure it is considered to be most efficient to apply doubling plate and/or build up by welding on the corroded spots in order to repair them out. Concerning the other corrosions. (1) Those were found in excessive condition especially at the topside transverse bulkhead of midship wing tank. (2) It is presumed that as years go on, the action of stress corrosion combined with possible structural defect, might work together and raise corrosion to initiate a crack. (3) The way of repairing them will be the same asmentioned above. It should be noted, however, that there has never been found any relation between corrosions of bottom plates and those of heating coil, etc. from the viewpoint of the spot where any corrosion may rise.
- 社団法人日本船舶海洋工学会の論文
- 1966-12-30