| Summary: | The Pipeline Engineering Tool (PET) developed by DNV is based on DNV-OS-F101 and is used for wall thickness calculations and other calculations. However, the calculations in PET are done without the possibility to see intermediate steps and Mathcad documents, with a visible train-of-thought, are therefore created to help clarify the calculations. The Mathcad arcs are created from the latest version of DNV-OS-F101 (2010) as opposed to the version PET uses (2000). Arcs for three limit states are created: bursting, collapse and propagating buckling. A Mathcad arc for the S-Lay installation process is also made. To verify the S-Lay theory used in PET (Bai, Y. & Bai, Q, 2005), a static FE-analysis is performed. Three separate FE-models are made: a global S-Lay installation model, a submodel of the sagbend and a model verifying the minimum horizontal lay radius.
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