Abstract

Dynamic installation of OMNI-Max anchors in clay: numerical analysis

Highlights

  • Installed anchors (DIAs) are the most recent generation of anchoring systems for mooring floating facilities for deep water oil and gas developments

  • Validation against field data The large-deformation finite-element (LDFE) results were validated against field data reported by Zimmerman et al (2009) and Shelton et al (2011), as noted in the second section of this paper (‘Reported data from field installation’)

  • An LDFE analysis was carried out using vi 1⁄4 19 m/s and su,ref 1⁄4 2·4 þ 1·1z kPa (η 1⁄4 1·0; β 1⁄4 0·1; γref 1⁄4 0·1 sÀ1; δrem 1⁄4 1/St 1⁄4 1/3; ξ95 1⁄4 20)

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Summary

Introduction

Installed anchors (DIAs) are the most recent generation of anchoring systems for mooring floating facilities for deep water oil and gas developments. The anchor is released from a specified height above the seabed. This allows the anchor to gain velocity as it falls freely through the water column before impacting the seafloor and embedding into the sediments. Torpedo anchors are rocket-shaped, typically consist of a long shaft, with the loading point (or padeye) attached at the top, and may feature up to four relatively small fins at the trailing edge (Brandão et al, 2006; Lieng et al, 2010). OMNI-MaxTM anchors feature three large fins with intermittent discontinuity to accommodate an arm that transfers the loading point nearer to the head of the anchor (Zimmerman et al, 2009; Nie & Shelton, 2011; Shelton et al, 2011)

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