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Results

Once the analysis has been successfully run, you can view various reports and results by clicking on the Results tab of the Analysis component and selecting the relevant buttons. Note that you must first select the stage of interest from the Stage drop-down list in order to view 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. In this example, the summary postprocessing plots are reproduced in the four figures below.

The first figure shows the vertical elevation of the pullhead as a function of stage number. The pullhead descends to the seabed over the first three stages and begins to ascend along the sloping seabed thereafter as more pipe is paid out while the length of the main cable is reduced.

The second figure presents the tension in the main cable (at the sheave) as a function of stage number. The tension increases during the first four stages but decreases in subsequent stages as the pullhead ascends the sloping seabed as more pipe is paid out and the cable is shortened.

The third figure plots the tension in the return cable (at the sheave) as a function of stage number. The tension is always 90% of the tension in the main cable, as expected.

The fourth figure shows the maximum Von Mises strain in the pipe section ‘24’’ Pipe’ as a function of stage number. The strain increases over the first four stages as the length of pipe hanging freely increases. By stage five the pullhead has reached the seabed where the strain increases sharply for the remaining stages as the pullhead approaches the sheave.

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