Introduction & Example Files

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Introduction & Example Files

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Introduction

Note

This example is simplified in PipeLay Starter Edition where there is no Von Mises stress criterion available. If you are using Starter Edition then you should ignore certain aspects of these articles, in particular parts of the ‘Results’ section.

 

Example 6 simulates a start-up via stab and hinge scenario. The example considers the paying out of a pipe over a stinger until the end of the pipe makes contact with the seabed. Once contact has been initiated, the end of the pipe is pinned at the seabed and the vessel is offset in the surge direction as more pipe is paid out.  The lay vessel is equipped with an S-Lay stinger fitted with V-shaped rollerboxes. Support locations on the stinger are defined explicitly using coordinates. The analysis procedure is performed as a series of nine static installation stages. The first four stages represent the pipe hanging freely from the vessel as it is lowered to the seabed. In the remaining five stages, the pipe is pinned to the seabed and the vessel is incrementally offset as more pipe is paid out. Von Mises stress in the sagbend region is used as the installation criteria for the last five stages. The two figures below illustrate the the start-up procedure. The first figure shows the initial configuration while the second shows the final configuration.

Initial Configuration

Initial Configuration

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Final Configuration

Final Configuration

 

 

Example Files

The input files for this example may be found in the directory ‘Example 06 – Start-up via Stab & Hinge’, which is located in the Examples subdirectory of your PipeLay installation directory. The input files are as follows:

Example 6 – Start-up via Stab & Hinge.ppd        

PipeLay project file

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