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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 five figures below. Structure snapshots for each of the 15 stages are also reproduced in the last figure.

The first figure below shows the maximum bending strain in the pipe section as a function of stage number. For the first four stages, the bending strain is at a value close to zero. However, once the pullhead reaches the seabed in Stage 5, the strain begins to increase to a relatively high value.

The second figure shows the tip separation as a function of stage number. The tip separation remains within the specified range throughout the recovery process.

The third figure shows layback as a function of stage number. The layback is relatively low in the first five stages as the bending strain in the sagbend is below 0.242 % so little or no offset is applied to the Seabed Connection. As the pullhead reaches the sagbend, the bending strain begins to exceed 0.242 % so the Seabed Connection is offset and the layback begins to increase from Stage 6 to Stage 10. The subsequent stages see a sharp decrease in lay back as the winch cable is paid in and the bending strain drops below 0.242 % once again.

The fourth figure plots the tension at the top of the pipe section as a function of stage number. The tension remains roughly the same over the first five stages, but then increases as the pipe lifts off the seabed. Once the top of the pipe is resting horizontally on the vessel deck (from stage 13 onwards), the tension becomes relatively constant.

The fifth figure shows the vertical elevation of the pullhead as a function of stage number. The pullhead is in contact with the seabed for the first five stages, so the elevation is zero. Then as the cable lifts the pipe off the seabed, the elevation begins to rise (from stage 5 to 12). Once the pullhead is on the vessel deck, the elevation remains constant.

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.

Bending Strain

Bending Strain

Tip Separation

Tip Separation

Lay Back

Lay Back

Tension at Top of Pipe

Tension at Top of Pipe

Vertical Elevation of Pullhead

Vertical Elevation of Pullhead

Structure Snapshots

Structure Snapshots

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