Ultimate Limit State

Oil & Gas Drilling Glossary - IADCLexicon.org

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Events with 10-2 annual exceedance probability (100-year return period events or events with a 1 % annual probability of occurrence).

NOTE ULS requires that the system survive with no damage, although operations can be suspended. For some cases, ULS and SLS cases can be the same.

Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Corresponding to the maximum load carrying resistance.

Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards

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