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120% factor when designing mooring line chain minimum breaking load?

asked Oct 29, 2014 in Offshore-Upstream by ekwuemesam (3,660 points)
Are mooring line connections to FPSO, anchor piles or between chain-wire segments (including shackles or H-links) designed for chain minimum breaking load of 120%?

1 Answer

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answered Oct 30, 2014 by gagonza (3,020 points)
The 120% of chain minimum breaking load requirement only applies to the design of the fairlead, chain stopper, and anchor pile.  

This requirement does not apply to the shackles or H-links linking the different segments of the mooring chains. Please note that shackles or H-links designed to 120% of chain minimum breaking load might not fit geometrically due to their oversize.

The objective of the 120% requirement is that in case of a mooring line failure the connections to the FPSO and mooring pile shall be undamaged such a new mooring leg can be installed without repair.

Hope that helps.