Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)

Korean Society of Ocean Engineers (한국해양공학회)
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Free Spanning of Offshore Pipelines by DNV 2002

DNV 2002에 의한 해저관로의 자유경간해석

  • Choi, Han-Suk (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Joo, Joo-Kyung (Hyundai Heavy Industry Co. Ltd.)
  • 최한석 (부산대학교 조선해양공학과) ;
  • 주주경 (현대중공업(주) 해양기본설계부)
  • Published : 2002.10.25
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Abstract

A procedure of free span and fatigue analysis of offshore pipelines was made per DNV-RP-F105, 2002. The new method includes the axial force and deflection load in pipelines. The screening criteria were used to calculate the allowable span lengths. The screening criteria allow small amplitudes of vortex-induced vibration due to wave and current loading. However, the induced pipe stress is very small and usually below the limit stress of a typical S-N curve. A simplified method was established to calculate the fatigue damage due to long-term current distribution. The long-term current statistics was assumed with a 3-parameter Weibull distribution. The fatigue damage was estimated for the span lengths obtained from the screening criteria for various conditions. Sample calculations show the effect of axial force for various boundary conditions.

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