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Results

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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 first four figures below. Structure snapshots for each of the nine stages are also reproduced in the last figure.

The first figure shows the vertical elevation of the pipeline end as a function of stage number. It descends from the stinger to the seabed during the first four stages as the pipeline is paid out. Naturally it remains on the seabed as further pipeline is paid out thereafter.

The second figure presents the maximum Von Mises stress as a function of stage number. It generally tends to increase over the first six stages as the pipeline is paid out over the stinger and down onto the seabed. It then remains relatively constant as the pipeline configuration in the stinger region does not change (i.e. the maximum stress is always in the overbend region).

The third figure plots the top tension as a function of stage number. The tension increases during the first four stages as the pipeline approaches the seabed. Thereafter it remains roughly constant as the length of pipeline supported by the vessel (i.e. between the stinger tip and the touchdown point) remains roughly the same.

The fourth figure shows the departure angle as a function of stage number. Initially the departure angle is quite shallow as the pipeline does not completely rest on the stinger. Then the departure angle approaches vertical, as the pipeline hangs freely from the stinger tip. Thereafter, it reduces slightly as the profile adopts a more typical S-Lay configuration.

The last figure presents structure snapshots at the various stages, all superposed onto the same graph. This summarises the overall abandonment scenario at a glance.

Vertical Elevation of Pipeline End

Vertical Elevation of Pipeline End

Maximum Von Mises Stress in Pipeline

Maximum Von Mises Stress in Pipeline

Top Tension

Top Tension

Departure Angle

Departure Angle

Structure Snapshots

Structure Snapshots