For each of the ten potential structure options, Atteris assessed typical piping component weights and associated spool loadings. The required foundation sizes and overall structure weight were then calculated according to recognised industry standards. Clash checks were performed to identify possible issues in the pipelay vessels’ firing lines and post tensioner work areas. Orcaflex analyses were preformed of the structures in both the overbend and sagbend situations to assess the resulting loadings on the vessel and adjacent pipeline joints. Multiple installation options were investigated to define limitations for mudmat arrangements and whether the PLET structures could be installed in the process of pipeline initiation or laydown.
