INNERBOTTOM DESIGN-PROBLEMS IN DOUBLE-HULL TANKERS

OPA '90 and parallel IMO rules are driving a phased changeover in tank er design from single-hull to double-hull construction. This paper des cribes field observations and analyses of two of the more persistent i nnerbottom design problems: the joint between frame vertical stiffener s and longitudinals, and panel cracks along the innerbottom/longitudin al seams. Potential shortcomings in applicable classification society rules are addressed and possible solutions at both the design and repa ir stage are offered.