Decommissioning
Managing end-of-life operations safely and sustainably.
Decommissioning projects demand tightly coordinated logistics, materials management, environmental services and waste solutions to stay safe, compliant and on schedule.
From managing materials and shipments to handling complex waste streams with full traceability, we deliver the control and visibility needed for efficient, risk-free decommissioning.
16 + years
continuous decommissioning delivery
30,000 t
Material decommissioned
98 %
recycling and repurpose rate
Managing the whole onshore chain
-
Plan and prepare
Site planning, waste and materials strategy, specialist contractor coordination, lifting requirements, regulatory considerations and agreed processing routes before infrastructure arrives. -
Receive and handle
Quayside and vessel coordination, cargo handling, weighing, inspection and safe movement into the processing area. -
Assess and decontaminate
Radiological assessment, NORM management, contamination control, produced-water handling and decontamination before further processing. -
Lift and dismantle
Heavy-lift assurance, SPMT planning, ground-loading considerations, controlled downsizing and management of specialist cutting and dismantling partners. -
Track and process materials
Identification, segregation and full material traceability, maintaining visibility of ownership, classification and destination throughout the programme. -
Recover, recycle and dispose
Maximising opportunities for reuse and recycling, with certified, auditable treatment and disposal of residual waste streams.
Proven in complex decommissioning
400-tonne subsea structure
ASCO managed the onshore recovery and downsizing of an approximately 400-tonne subsea isolation valve.
When the cutting programme presented a risk to the quayside, ASCO’s environmental and lifting-assurance teams engineered a bespoke load-spreading solution, allowing work to continue safely.
- 99% recycled
- Zero NORM contamination
- Zero damage to port infrastructure
Major UK FPSO decommissioning programme
ASCO managed the full onshore scope for an FPSO and its associated subsea infrastructure, integrating produced-water management, recovered-infrastructure processing and specialist NORM treatment across multiple UK locations.
- 2,400 tonnes of produced water and flushings managed
- 1,675 tonnes of subsea infrastructure received and processed
- One integrated ASCO delivery team
Chevron Thevenard Island
ASCO supported the decommissioning and remediation of nine ageing offshore platforms in Australia, advising on downsizing, SPMT movements, site layout, safety protocols and material recovery.
- 12,000 tonnes of material safely decommissioned.
- Environmental restoration targets met
- Enhanced workforce capability through training and knowledge sharing
Connect with our experts
Kelly Smith
Group Head of Environmental and Decommissioning
Kelly has over 15 years of experience in the oil and gas services industry, specialising in environmental and waste management, operational delivery and business growth. She leads the Environmental and Decommissioning service line across the UK and supports international projects.
James Gordon
Business Development Executive - Environmental and Decommissioning
James has over 30 years of international experience in the energy sector, specialising in business development, operational delivery and client relationships. He leads growth initiatives for ASCO’s Environmental and Decommissioning services across the UK, supporting opportunities across energy, renewables, construction and defence.
Sustainability