Main Columns : Vertical, Cylindrical or multifaceted buoyancy members of the hull structure which provide platform stability and deck support. Tendons are supported by thee columns. (RP 2T)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}