RiserTec analysed the global bundle and local spool pipework as well as local material defects using detailed 3D FEA in order to understand the loadings and FOS for the operating conditions on remaining pipe wall thickness.  The analyses were completed in ABAQUS using 3D and pipe-in-pipe modelling techniques and considered both limit state stress and strain based design approaches.

RiserTec provided specialist Fracture Assessment on an Umbilical to establish that despite manufacturing issues the Umbilical was fit for purpose and adequately strong for the design life required.  The 30kM Umbilical was shown by BS7910 and R6 assessment to have an adequate operational life based on a calculation of maximum initial defect size and through life loadings.  The Umbilical was also successfully pressure cycled by Duco to substantiate the fatigue life claims established through detailed FEA and Fracture Assessment. RiserTec worked with GLO the certifying body Sandvik the material supplier, Technip, Duco and British Energy to produce a state-of-the-art fracture assessment to establish the long term fitness for purpose of the umbilical.