ABSTRACT

A parametric study was performed for grounding damage calculation using the program DAMAGE developed by the MIT-Industry Tanker Safety Consortium, in support to structural development of pollution-preventive oil tankers. Four double hull and two single hull tankers of conventional type built by the Daewoo Heavy Industries were chosen as calculation models and damage predictions were made by varying parameters defining a grounding scenario. The grounding resistance was investigated by comparing the calculation results and the current design practices of the existing codes originated from international maritime agencies and classification societies. The result is that all four double hull tankers are "safe" against oil leakage caused by grounding accident; in other words their present structural arrangement and scantling are sufficient to carry the corresponding grounding loads. The results of single hull tankers were compared with those of double hull tankers and a concept of grounding resistance grade was discussed The above mentioned computer program proved to be a useful and convenient tool, especially in the initial stage of design when many alternative designs for grounding resistance should be considered with modifications of structural arrangement and scantlings. The program is, however, in its initial phrase of development and has to be refined in many ways. Some comments on the program from a user's point of view are offered which will make it more robust.

1. Introduction

Much effort has recently been put worldwide to develop a robust tanker structure capable of minimizing oil spill with a considerable increase in the grounding resistance. Most of the activities has been focused on experimental studies and numerical simulations using commercial FEM codes. For a recent survey of methods and solutions the reader is referred to Ref. [1–12].

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