This paper presents a fatigue analysis of a differential thread connector for a special high strength 9 5/8", 471b/ft offshore production riser. The connector was designed to be manufactured from a commercially available upset casing thereby eliminating the need for welding and enhancing the riser's fatigue life expectancy. The method of finite element analysis was used to determine the peak static and alternating stresses in the connector. Conditions considered in the analysis include assembly pre-load, dead weight and static/dynamic bending movements due to waves. Typical North Sea wave data were selected for this analysis. Miner's rule was employed to estimate the fatigue life of the connector in conjunction with the ASME section VII, Division 2 S-N curve.

Keywords:
internal pressure, assembly preload, fatigue analysis, directionality, connector, normal loading, mean stress assembly 60, application, upstream oil & gas, axial tension
Subjects:
Pipelines, Flowlines and Risers, Risers
Copyright 1983, Society of Petroleum Engineers of AIME
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