Section 4 Mooring line requirements

Clasification Society 2024 - Version 9.40

Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, July 2022 - Part 3 Functional Unit Types and Special Features - Chapter 14 Foundations - Section 4 Mooring line requirements

Section 4 Mooring line requirements

4.1 Inverse Catenary Analyses

4.1.1 Analyses should be performed using upper and lower bound soil conditions to determine mooring line inverse catenaries in the soil. These will provide the maximum and minimum expected mooring line angle at the anchor padeye.

4.1.2 The calculated range of inverse catenaries should be assessed to demonstrate that the worst case anchor loading has been considered.

4.2 Mooring Line Preload

4.2.1 For anchor types not required to be test loaded at installation it is necessary to perform mooring line pull-in at installation to prevent unacceptable mooring line slack due to inverse catenary cut in during storm conditions.

4.2.2 Details of intended line pull in procedure and load magnitude and any supporting calculations are to be submitted.

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