51312-01620-CORROSION MANAGEMENT OF AGING ASSETS FROM THE NEW OPERATOR’S PERSPECTIVE

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Product Number: 51312-01620-SG

ISBN: 01620 2012 CP

Author: Zeinab Marsh

Publication Date: 2012

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In 2008 TAQA acquired the Shell Northern North Sea asset cluster. This comprised the Cormorant Alpha North Cormorant Eider and Tern platforms and the associated pipelines and subsea tie backs The oldest of these platforms came on line in 1978 and has passed its original design life of 30 years. The purchase also included a share of the Brent main oil line (now operated by TAQA) and a share of the Sullom Voe oil terminal (operated by BP). The previous operator had defined these assets as “end of life” with this defined as 2009. TAQA needed an extended life to 2025. This required a substantial re-alignment of corrosion management priorities. Extensive rework of documentation was performed to create a corrosion management system for both pipelines and assets in accordance with the recent recommendations by the UKHSE and the Energy Institute. The UK HSE KP4 requirements for life extension were assessed and the implemented. KPIs corrosion control matrices corrosion mitigation measures and corrosion monitoring were redefined and re-engineered to take into account both the extended life requirements and future as well as present operating conditions. Materials of construction were re-assessed for compliance with ISO 15156 given the increasingly sour production conditions due to field souring. This publication discusses the issues described above and the changes in corrosion management that were required to ensure compliance with the required life extension.