Double Hull Tanker Structures - Some Practical Considerations about CSR Application

It is absolutely important for the design of tankers to reasonably keep structural safety and environmental friendliness at the same time. As one of keys to obtain this goal, Common Structural Rules (CSR) have been developed by IACS and design conditions have been clarified together with the clear correlation between corrosion additions and renewal thickness. We can say that universality and transparency of rules has been increased and safety level has also been upgraded by the increase of hull scantlings. However, we should be careful whether we could achieve the increase of safety level by reasonable hull steel increase or not. By showing several advanced tanker designs and examples of details which are not necessarily required by CSR, this paper insists on the necessity of further considerations and understandings of hull structure. In addition, this paper shows the necessity of more goal-based approach rather than present prescriptive one to design more reasonable and robust tankers using examples of stress response function analysis for the prevention of unexpected damages.