Abstract

Abstract On-bottom stability analysis of subsea cables is commonly carried out in accordance with the leading industry practice for subsea pipelines "DNV-RP-F109". Similar to pipelines, the analysis method typically used is F109's Generalized Lateral Stability Method. However, this method is considered to be overly conservative for small diameter cables in shallow water applications such as the Arabian Gulf. Consequently, costly additional stabilization measures such as vast quantities of concrete mattresses are normally required. Given the flexible nature of cables, dynamic on-bottom stability analysis is considered to be a rational approach for optimizing the stabilization requirements. Dynamic on-bottom stability analysis is a known approach for subsea pipelines; however, its application is normally limited to extreme cases of environmental conditions where concrete coating requirements exceed practical limits. Hence, ADMA-OPCO has initiated a study to develop an FE model for dynamic on-bottom stability analysis of subsea cables. The outcome of ADMA-OPCO's study demonstrated that dynamic on-bottom stability represents the best approach for achieving cost-effective stabilization solutions for subsea cables. Hence, it is envisioned to become the norm for on-bottom stability analysis of subsea cables. The key features of the FE model are presented as well as general guidance for dynamic on-bottom stability analysis of subsea cables.

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