A Review of DNVGL-RP-F105 Fatigue Assessment Model or Why My Free Span Has Not Failed

Mario Caruso
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Abstract

The objective of a free span fatigue assessment is to provide a rational criterion to evaluate the long-term integrity of a free spanning pipeline, to which DNVGL-RP-F105 was developed. The Recommended Practice has a long history. Guideline 14, the foundation document to it, was released in 1998. The guidelines of the DNVGL-RP-F105 were gradually adopted by the industry for free spans analysis, and even API 1111 makes direct reference to it. Today, DNVGL-RP-F105 is the de facto Vortex Induced Vibration analysis guide for all applications where small number of bending driven modes are expected to be excited, overstepping its original purpose of free spanning pipelines and providing guidance when no other source exists. With such a long history, it is easy to forget the basis for the Recommended Practice fatigue model and obtain results that do not match expectations. A prime example is when assessing a free span based on survey and the fatigue life capacity calculated following the Recommended Practice is much smaller than the actual exposure time. In this situation one may ask “why my free span has not failed?” and conclude that the Recommended Practice is either too over conservative or plainly wrong. This paper reviews some key aspects of the DNVGL-RP-F105 fatigue model and explore their implication to fatigue design and assessment. And it hopes to clarify why your free span has not failed even when you expected it to.
DNVGL-RP-F105疲劳评估模型综述&“为什么我的自由跨度没有失效
自由跨疲劳评估的目的是为评估自由跨管道的长期完整性提供一个合理的标准,DNVGL-RP-F105就是为此而开发的。推荐实践有很长的历史。准则14,它的基础文件,于1998年发布。DNVGL-RP-F105的指导原则逐渐被业界采用,甚至API 1111也直接参考了它。如今,DNVGL-RP-F105实际上是旋涡诱导振动分析的指南,适用于所有希望激发少量弯曲驱动模式的应用,超越了其自由跨越管道的原始目的,并在没有其他源存在的情况下提供指导。有了这么长的历史,很容易忘记推荐实践疲劳模型的基础,并获得与预期不匹配的结果。一个典型的例子是,当根据调查评估自由跨度时,根据推荐实践计算的疲劳寿命容量远远小于实际暴露时间。在这种情况下,人们可能会问“为什么我的自由跨度没有失效?”,并得出结论:“推荐做法”要么过于保守,要么明显是错误的。本文综述了DNVGL-RP-F105疲劳模型的一些关键方面,并探讨了它们对疲劳设计和评估的意义。它还希望澄清为什么即使在您预期的情况下,您的自由跨度也没有失效。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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