Pontoon 6 : Horizontal, cylindrical or rectangular buoyancy members of the hull structure which interconnect with columns to form a frame below the waterline. (RP 2T)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}