Introduction & Example Files

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Introduction & Example Files

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Introduction

Note

This example does not run in PipeLay Starter Edition unless you simplify it by removing the Sheave component from the model as this particular component is disabled in Starter Edition. Once removed you should consider replacing it with a suitable connection point. If you are using Starter Edition then you should ignore certain aspects of these articles, in particular parts of the ‘Results’ section.

 

Example 7 simulates a start-up via sheave scenario. The example considers a pipeline initiation to the shore via a winch cable, which runs from the lay vessel to a sheave on the shore before returning back up to the vessel. The winch cable is modelled as two separate cables, one running from the vessel to the sheave (main cable) and the other running from the sheave back up to the vessel (return cable). The lay vessel is equipped with a rigid S-lay stinger fitted with V-shaped roller boxes, which follow user-defined radii of curvature. The pipe is restrained at the vessel by a tensioner. The analysis procedure is performed as a series of eleven static installation stages in which the pipe is paid-out incrementally and the length of the main cable is reduced correspondingly. An optimum length for the return cable at each stage is automatically obtained based on the sheave efficiency ratio. The two figures below illustrate the the start-up process. The first figure shows the initial configuration while the second shows the final configuration.

Initial Configuration

Initial Configuration

Final Configuration

Final Configuration

 

Example Files

The input files for this example may be found in the directory ‘Example 07 – Start-up via Sheave’, which is located in the Examples subdirectory of your PipeLay installation directory. The input files are as follows:

Example 7 – Start-up via Sheave.ppd        

PipeLay project file

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