Once the analysis has been successfully run, various reports and results may be viewed by going to the Results tab of the Analysis component and selecting the relevant buttons (Note: The stage of interest must be selected in the Stage drop-down list in order to get the results appropriate to that particular stage).
PipeLay also generates plots for the various parameters requested on the Summary Postprocessing tab. These plots illustrate the change in a particular parameter from one stage to the next.
The first figure shows structure snapshots at the various stages, all superposed onto the same graph. This neatly summarises the overall Davit Lift process at a glance.
The second figure presents the tension in the winch cables as a function of stage number. A separate plot for each winch cable is generated automatically, and all three are superposed here for ease of comparison. The tension in the first cable increases in stages two and three as the pipeline end lifts off the seabed. In stages three and four, the majority of the load is carried by the second cable, as the pipeline starts to adopt an S-type configuration. The tension in the third cable increases steadily from stage two onwards, and ultimately it supports most of the pipeline weight. The maximum cable tension is experienced by the third cable in the last stage, reaching a value of almost 500kN.
The third figure shows the maximum bending stress as a function of stage number. The maximum bending stress increases as the stages progress. Naturally the bending stress is zero in the first stage as the pipeline lies flat on the seabed. It increases steadily over the remaining stages as the pipeline adopts an S-type configuration. The maximum bending stress occurs in the last stage, with a magnitude of over 400MPa.
Tension in Davit Lift Cables
Bending Stress in the Pipeline