Page 59: of Offshore Engineer Magazine (Nov/Dec 2014)

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• Closer attention to the manufacture, The assumption that increasing safety design and updating the Oil and Gas UK

Vessels selection, traceability, and loading factors will improve reliability is con- Mooring Integrity Guidance. history of all mooring equipment, both tradicted by the actual failure rate in the owner and rental; NCS, which does not show a propor- Andrew Comley is a •

Enhancing inspection and maintenance tional increase in reliability despite the consultant with DNV requirements for mooring equipment; signi? cantly increased mooring system GL providing •

Verifying actual vessel response against strength requirements. specialized integrity theory, including the impact of any Work still remains though to ? nd and incident modi? cations, and; practical ways to improve reliability. An investigation

Adequately calibrating and testing increased focus on improving under- services, recom- • winch load cells and thrusters. standing of past failures is probably menced his associa-

Work remains to be done to perform a the most opportune method to improve tion with the company in 2008 as the wider and more detailed investigation mooring system reliability. Mooring Integrity Phase 2 JIP project of historical North Sea failures and their engineer. Previously he has worked for root causes, in order to identify areas Will Brindley joined Steel-kit, King? sher Marine Services, where attention can best be focused to DNV GL after Noble Denton, UK HSE and Advantica. improve reliability. This could be more graduating in 2011 He gained a Bachelor’s degree in naval readily performed if all failures were with a Master’s of architecture and shipbuilding from openly reported and investigated by engineering in naval Newcastle University in 1994 before operators. architecture and undertaking Lagrangian computational ocean engineering ? uid dynamics research at Glasgow

Conclusions from the University University.

The failure statistics for MODU mooring of Strathclyde. Brindley’s studies were

This article is a reduced version systems indicate a mooring line failure punctuated by placements at the of the paper OMAE2014-23395 pre- would be expected to occur on average Samsung Heavy Industries shipyard sented at the Proceedings of the ASME every 24 rig years and a multiple-line design of? ce and the Intelligent

DUAL SEAL AD 1/11/07 15:28 Page 1 2014 33rd International Conference failure around every 112 rig years. This Engineering composite structures on Ocean, Offshore and Arctic failure rate appears to be several orders of analysis team. Since joining DNV GL he

Engineering, June 8-13, 2014, San magnitude greater than industry targets has worked on naval architecture

Francisco, California, USA.

used to calibrate mooring codes. advisory projects including mooring advisory projects including mooring

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