23. What term is used to describe a tank barge constructed with the structural framing inside the cargo tank and the side shell plating containing the cargo?

A single-hull tank barge is defined as one where the side shell plating forms the cargo tank boundary, with framing inside the tank and no protective void space. This configuration distinguishes it from double-hull designs, which have a void or ballast space between the outer shell and the cargo tank boundary, and excludes other arrangements like hopper type or independent tanks. The question's description of structural framing inside the cargo tank and side shell plating containing the cargo directly corresponds to the definition of a single-hull tank barge.