Current fatigue design of fracture-critical flowlines relies on two different fatigue assessment methods - the S-N approach and the fracture mechanics (FM) approach. The fatigue life predictions from the two approaches could be vastly different. A key reason for this difference could be due to the safety factors (SF) used in the two approaches. A reliability-based method has been developed in a previous study (Macia, et al., 2009) to rationalize the selection of an SF on fatigue life for use in the FM approach. This paper applies the developed method on the fatigue design of Julia flowline and uses the project-specific data of the flowline to arrive at an FM SF less than the typical value of 5 while still maintaining an equivalent level of reliability for the fatigue design of the flowline obtained from the S-N approach.

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