Example 1

28.1.1.1. Example 1#

Example (1) Calculation of a force-excursion characteristic with Fairlead attachment 200 m above seabed. Full chain line:

Studless chain Vicinay R4S 147 mm, Breakload 18852 kN, weight 376 kg/m, EA ~ 1850 MN, length 600 m

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Example shows: Non-linear line behavior High forces (full chain) With larger excursions high tensions

What is the stiffness?

Stiffness at pretension of 1200 kN equals ~ 15 kN/m

Using example (1) In Multi-line mooring systems, the force-excursion characteristics of the single lines are combined in a total system and are dependent on the pretension in each line.

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The resulting stiffness is (refer curve): Kmooring = 600 / 20 = 30 kN/m