DECOMMISSIONING & ABANDONMENT
DOF Subsea Achieves 99% Recycle/Repurpose Rate on Latest Decommissioning Project
A decommissioning project carried out by DOF Subsea, on behalf of Repsol Sinopec Resources UK, to project manage and provide Engineering, Preparation, Removal and Disposal (EPRD) services at the Buchan and Hannay fields in the Central North Sea, has achieved a 99% rate for the combined recycling and repurposing of recovered materials.
The offshore works, which were carried out over 74 days, using DOF Subsea’s Skandi Acergy and Skandi Skansen vessels, saw the recovery of 135 concrete mattresses weighing approximately 800 tonnes, more than 12km of rigid pipelines, SSIV/PLEM Structures, 15.5km of flexibles and umbilicals, spoolpieces, and around 1,500 grout bags and general debris.
The material was shipped to Aberdeen Harbour’s Clipper Quay for dispersal, with 95% of the material being recycled and 4% being repurposed. Only 1% was sent to landfill as a last resort.
The recovered material was dispatched for a wide variety of uses. A total of 15 concrete mattresses were repurposed into aggregate, and used in the roads at the £350m Aberdeen Harbour extension project. The plastic sheaths from the flexible risers and umbilicals were recycled by an approved supplier and all metal was smelted.
DOF Subsea worked closely with Scotoil Service in Aberdeen throughout the process with any NORM contaminated waste in metals or plastics removed by high pressure cleaning at Scotoil before undergoing high temperature incineration. The decontaminated metals and plastics were then recycled.
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www.sosmagazine.biz May 2022
This was the second decommissioning project carried out by DOF Subsea on behalf of Repsol Sinopec in the Buchan and Hannay fields. In 2019, the company carried out EPRD services which included the 124 tonne Mid-Water Arch (MWA), still one of the largest structures ever decommissioned through Aberdeen Harbour.
That project also included the recovery of risers and all associated equipment, achieving a combined recycling and repurposing rate of 97.7%.
DOF Subsea has been building its decommissioning portfolio over the past decade, and with a global support team of more than 120 engineers has delivered more than 30 projects around the world for major operators, resulting in an average reuse and recycling rate of 97%.
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