Large scale analysis of integrated seabed facilities, London

1 February, 2017 | 18:00 - 20:00

Venue address:

Institution of Civil Engineers
One Great George Street
London SW1P 3AA
United Kingdom
Subsea monitoring equipment.
Subsea monitoring equipment.

About this event

In seismically active offshore regions of the world subsea facilities could potentially be subjected to significant earthquake excitation. The consequences of failure of such facilities carrying hydrocarbon products at high pressure and high temperature can be catastrophic to the environment.

In current practice these structures are typically designed to meet the requirements of ISO 19901-2 against both the extreme level and abnormal level earthquakes using response spectrum analysis methods.

Subsea 7 has recently analysed subsea facilities in an integrated manner in which all nonlinear effects are included and all system effects are captured. In these models all the components of the system are represented. These may include pipelines, flexibles, PLEMs on suction piles or sliding PLETs on skirted mudmats, often joined together with rigid spools.

In direct integration non-linear dynamic FE analyses the system is simultaneously subjected to free field time history accelerations in three orthogonal directions at appropriate depths through soil-structure interfaces. These interfaces are modelled with special kinematically hardening elements with the hysteretic damping characteristics calibrated to the site-specific soil properties.

General purpose post-processing scripts extract the vital data at multiple selected time increments from the large amount of output generated and produce, for example, contours of the envelopes of utilisation factors of various components to their respective codes.

Event materials

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Dr Hesar

Dr Hesar is an independent engineering consultant currently working in the pipelines department of Subsea 7. He recently spent two years in Rio de Janeiro, Brazil where he was responsible for the development and design of the hybrid vertically loaded suction anchor groups that support the massive riser support buoys of the pioneering Guara-Lula project in the Pre-Salt fields.

He has 35 years' experience in engineering practice. Through working for Kvaerner Earl and Wright, Ove Arup, Bechtel and KBR he has applied Finite Element techniques to numerous novel geotechnical problems, including: The pioneering Bucket Foundations for Statoil's Sleipner Vest platform, Suction anchors for various FPSOs, TLP multi-cell concrete suction anchors, skirted foundations of GBSs, ice scouring simulation of seabed over trenched pipelines, large-scale cyclic lateral excursions of snake-laid pipelines, and the retrievable skirted shallow suction foundations.