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Calculation of Flexcom Input Data

This section describes how the required geometric properties for input to Flexcom are calculated from the data in the Buoyancy Module Data Table to the Telescopic Joint Properties Table. In specifying geometric properties using the Flexcom Rigid Riser format, values are explicitly input for:

•E (Young’s Modulus)

•G (Shear Modulus)

•Do (External Diameter)

•Di (Internal Diameter)

•ρ (Mass Density)

•Dd (Drag Diameter)

•Db (Buoyancy Diameter)

In specifying geometric properties using the Flexcom Flexible Riser format, values are explicitly input for:

•EIyy (Bending Stiffness about Local-y Axis)

•EIzz (Bending Stiffness about Local-z Axis)

•GJ (Torsional Stiffness)

•EA (Axial Stiffness)

•M (Mass per Unit Length)

•P (Polar Inertia of Cross-Section per Unit Length)

•Di (Internal Diameter)

•Dd (Drag Diameter)

•Db (Buoyancy Diameter)

The following abbreviations are also referred to during calculations:

•Esteel (Young’s Modulus of Steel)

•Gsteel (Shear Modulus of Steel)

•ρsteel (Mass Density of Steel)

•T (Thickness)

•A (Cross Sectional Area)

•V (Displaced Volume per Unit Length)

•MP (Mass per Unit Length of Peripheral Lines)

•VP (Displaced Volume per Unit Length of Peripheral Lines)

•MMOD (Mass of Single Buoyancy Module)

•VMOD (Volume of Single Buoyancy Module)

•NMOD (Number of Buoyancy Modules per Joint)