中小型タンカーの座礁時油流出防止性能の研究
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概要
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Oil spills from oil tankers of 4,999 to 40,000tons deadweight at stranding are studied and measures to reduce oil spills are proposed. 4,999DW tanker is provided with double bottom and single side hull and 10,000, 30,000 and 40,000DW tankers are provided with double hull, in compliance with IMO rules. Simple stranding scenarios are assumed; Rock with triangle section destroys the ship's bottom along center line. Ships, fully loaded at service speed, strand and have neither heel nor trim after stranding. New calculation method is proposed. Firstly oil capacity, spilled out from destroyed cargo oil tanks due to oil pressure exerted on inner bottom, is calculated. Secondary oil capacity below rock top, replaced by sea water due to the difference of the specific gravities is calculated. Oil capacity, spilled out from cargo oil tanks, is calculated corresponding to 7 kinds of damage height (i.e. rock height) based on the statistical data and multiplied by each probability of damage height. As conclusions, followings are found. 5,000DW coastal tanker has no oil spill. 10,000DW tanker has little oil spill and the amount of oil spill increases in the 30,000DW and 40,000DW. The double hull and fore peak tank is very effective to retain much percentage of spilled oil from cargo oil tank and prevent spill-out to the sea. To reduce oil spills, increase of the double bottom height of No.1 cargo oil tank and capacities of fore peak tank and double hull are very effective.
- 社団法人日本船舶海洋工学会の論文
- 1995-03-29