When do I use the Xtra hydrodynamic data?
When the pipeline does not experience the wave or current effects then under xtra/hydro data set Cm=0, Cd =0 and CL = 0 across the range of pipe selected e.g the pipe is in a J-tube, seabed pipe is buried or when concrete mattresses are applied to the seabed piping. These Hydrodynamic coefficients will over-ride the ones defined under Load/Wave.
