Definition(s)
Cofferdam
Cofferdam is the isolating space between two adjacent steel bulkheads or decks. This space may be a void space or a ballast space.
Source: Resolution MEPC.119(52), 2004 amendments to the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code), 15 October 2004. Regulatory guidance, International Maritime Organization