This paper investigates analytically and numerically the burst failure and reliability assessment of ultra-high strength (X-100 to X-120) steel pipelines based on their elastic-plastic collapse behaviour. First, a model that properly accounts for the strain hardening behaviour of ultra-high strength category of pipelines is derived. Some models for high strength pipes are adopted from literature and their key features are discussed. The models are verified by two dimensional finite element analyses and burst test data for ultra-high-grade steel pipelines. Two statistical measures are used to compare the accuracy of models for ultra-high strength steel pipe. An appropriate theoretical model with strain hardening based on the von Mises yield criterion is chosen from the models.A case study is constituted for reliability analysis of an ultra-high-grade steel pipeline under an operational condition. Limit state function is formulated using the selected model as strength variable and operational loading pressure. Probabilistic models are applied to the basic variables of limit state variables. First Order Reliability Method is used to assess reliability in terms of reliability indices for this category of pipelines followed by a sensitivity analysis that identifies most significant limit state variables.&nbsp; The results of this study can provide vital measures for design and maintenance planning of ultra-high-grade steel pipelines.&nbsp;

Burst Failure and Reliability Assessment of X-100 to X-120 Ultra-High Strength Pipes

Paper Proceedings: https://asmedigitalcollection.asme.org/OMAE/OMAE2021/volume/85116

OMAE 2021

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