Results - Dynamic Analysis

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Results - Dynamic Analysis

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The dynamic analysis in this example corresponds to stage number 2. Results for this analysis are presented in the four figures below. Each plot represents an envelope of a particular parameter plotted against the curvilinear distance along the pipeline from the vessel connection point, ‘_TensionerVCP(1)’.

The effective tension envelope along the outer pipe is shown in the first figure. At the upper bulkhead there is an envelope with a range of approximately 350kN. This is consistent with expectations as it is in line with a default tensioner deadband of +/- 10%. The tension extremes at all points along the pipeline are always positive, so the pipeline never goes into compression.

The effective tension envelope along the inner pipe is shown in the second figure. Again at the upper bulkhead the effective tension value is in line with a default tensioner deadband of +/- 10%, exhibiting a range of approximately 35kN. The tension extremes at all points along the pipeline are always positive, so the pipeline never goes into compression.

The bending moment envelope along the outer pipe is presented in the third figure. The majority of the bending moment variation occurs in the sagbend region and touchdown zone. The moment distribution on the vessel deck and along the stinger remains more or less constant during the analysis.

The bending moment envelope along the inner pipe is presented in the fourth figure. There are certain bending moment variations from the touchdown zone upwards, but their overall magnitudes are still relatively small.  As already captured by the static analysis, there is sagging of the inner pipe between any two adjacent centralisers.

Effective Tension Envelope for Outer Pipe

Effective Tension Envelope for Outer Pipe

Effective Tension Envelope for Inner Pipe

Effective Tension Envelope for Inner Pipe

Bending Moment Envelope for Outer Pipe

Bending Moment Envelope for Outer Pipe

Bending Moment Envelope for Inner Pipe

Bending Moment Envelope for Inner Pipe

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