Abstract

Mohamed A Osama
Heavy lift semi-submersible barge: A new tool for caissons conceptual design
Abstract – The rapidly expanding offshore industry worldwide and the introduction of dry towing since 1975, lead to an increase in demand for heavy lift transport. The fleet of semi-submersible ships/barges expanded through an addition of 19 newly built converted ships/barges during 2006 to 2012. Although, the design of stability columns (Caissons) represents the corner stone that affects the intact and damage stability specially at submerging processes, there is no sufficient data available in the literature. Therefore, the aim of the present study is to introduce a new tool for caissons conceptual designs to achieve the stability standards specified by the regulation authorities for intact stability. A mathematical model was developed using (MATHLAB) to determine the caissons preliminary dimensions for any barge based on its particulars and required submerged depth. Furthermore, the model was validated through a case study of a 100 m barge and submerged depth of 7 m, using a computer package (MAXSURF). The model results were found to meet the harshest stability standard specified by regulation authorities and classification societies. Hence, this model represents an innovative tool for any barge caissons conceptual design.