Ashtead Technology Decommissioning Brochure

Decommissioning Leading the way in safe and efficient offshore decommissioning

Ashtead Technology is a leading subsea technology solutions provider to the global offshore energy sector.

We provide specialist subsea solutions, advanced technologies and expert services to support the development, optimisation and decommissioning of offshore energy projects worldwide.

At a glance

30,000+ assets

40+

Norway

years experience

UK Canada USA

UAE

15 Singapore

global locations

650+ experts

Contents Decommissioning solutions

04

Pipeline cutting and recovery

11

Project lifecycle

05

Mattress recovery

12

Site inspection

06

Debris clearance

13

Jacket removal

07

Riser cutting and recovery

14

Conductor cutting

08

Topside removal and recovery

15

Exotic material cutting

09

Experts you can trust

16

FPSO disconnect

10

Why Ashtead Technology

17

Global track record

18

To view our portfolio of subsea technology solutions, visit our website: www.ashtead-technology.com

Decommissioning solutions Ashtead Technology is proud to play a vital role in the global energy transition, supporting critical offshore decommissioning projects worldwide.

With over 25 years of decommissioning experience, we deliver specialised cutting, recovery and dredging systems, ROV tooling, inspection, control and structure monitoring solutions - all designed for deployment by ROV or diver to support every stage of the decommissioning process, from pre-survey and seabed mapping to subsea removal.

Our technology and expertise in underwater surveys, mechanical operations and asset integrity enables safe, efficient and reliable subsea operations, and as underwater cutting specialists, we help our customers achieve successful project outcomes.

At a glance

30,000+ Subsea cuts completed

800+

Specialist decommissioning projects delivered globally

60+

Specialist cutting, recovery and dredging techniques available

12+

New OEM technologies launched into the decommissioning market to date

04

Project lifecycle As a full-service decommissioning solutions provider, we support every stage of the decommissioning lifecycle, from preparatory surveys and inspection, to cutting, recovery, clearance and complete back-deck solutions.

Planning and Site Inspection

Comprehensive predecommissioning surveys and inspections to assess asset condition and environmental considerations.

Seabed and structural surveys Asset inspection and verification Data acquisition and reporting

05

Site Preparation and Mitigation

Preparing structures for removal through debris clearance, cleaning and environmental mitigation.

Marine growth and monopile cleaning Debris clearance Environmental monitoring and mitigation

Cutting and Separation

Precision cutting operations across topside, subsea and renewable structures.

Pipeline, umbilical and flowline cutting Monopile, multi-string and mooring chain cutting Deck separation and conductor removal

Removal and Recovery

Clearance and Restoration

Safe and controlled dismantling, retrieval and handling of assets.

Final site verification and environmental restoration activities to ensure safe, compliant and sustainable outcomes.

Module, jacket and infrastructure removal Cable recovery and wellhead structure removal Conductor recovery, sectioning and pinning

Seabed clearance and debris removal As-left surveys and verification Environmental monitoring and reporting

Site inspection We deliver comprehensive inspection, monitoring and integrity assessment solutions to ensure safe, compliant and cost-effective project execution.

Utilising advanced subsea survey and inspection systems, we provide high-resolution imaging, acoustic positioning, structure monitoring and nondestructive testing to assess the condition of subsea infrastructure prior to decommissioning activity.

These services support critical decision-making, from verifying asset integrity and planning removal strategies, to monitoring environmental impact and ensuring regulatory compliance.

By combining cutting-edge technology with deep technical expertise, Ashtead Technology helps customers manage risk and optimise outcomes throughout the decommissioning process.

06

Jacket removal Ashtead Technology are industry leaders in developing solutions that safely and efficiently remove complex offshore jacket structures minimising risk while maximising operational efficiency.

Using our market-leading abrasive cutting technology, jacket legs can be severed internally below the mudline to achieve a clean, precise and controlled removal.

Our pile dredge systems enable effective belowmudline access, supporting full and safe severance of jacket legs during decommissioning.

When internal cutting isn’t an option due to access limitations, we offer a range of alternative cutting solutions including Diamond Wire Saws, Chop Saws and Hydraulic Shears - all engineered and maintained in-house by our cutting experts.

07

Conductor cutting As underwater cutting specialists, Ashtead Technology delivers a complete conductor cutting service designed to minimise vessel time, enhance safety and keep decommissioning operations on track.

Our specialist teams deploy advanced cutting technologies - including Diamond Wire, Abrasive Water Jet and Internal Cutting Systems - engineered to deliver precise, controlled cuts across a wide range of conductor sizes and materials.

Fully ROV-compatible and adaptable for both surface and subsea applications, our solutions are engineered for precision and efficiency in challenging offshore environments.

08

Exotic material cutting Decommissioning projects frequently involve structures constructed from high-strength or composite materials such as Duplex, Inconel, titanium and steel with cement or corrosion-resistant cladding.

These complex materials require specialist tooling and proven techniques to achieve precise, efficient cuts in demanding offshore environments.

Leveraging advanced Hydraulic Shears with patented bat blade technology, and Diamond Wire and Chop Saw technologies, our expert engineers at Ashtead Technology deliver reliable solutions for severance of multi-string, mixed material and reinforced components.

09

FPSO disconnect Ashtead Technology delivers safe, efficient and reliable FPSO disconnection solutions purpose-built for complex offshore decommissioning and field reconfiguration projects.

Our combined suite of ROV-friendly cutting tools is designed to safely cut risers and bend stiffeners as close to the FPSO hull as possible, providing a precise, controlled approach that minimises residual lengths and simplifies recovery.

Our Ring Saw is specifically designed for restricted access locations and excels at cutting elastomer bend stiffeners, steels, coatings and other materials at depths of up to 3,000 m. Its compact, slimline design, maximises cut penetration while minimising hydraulic and deck space requirements, allowing fast, back-to-back cuts without the need for deck recovery.

With our track record and adaptable tooling capability, Ashtead Technology gives operators the confidence to execute FPSO disconnect operations safely and efficiently.

10

Pipeline cutting and recovery Ashtead Technology provides specialist subsea pipeline recovery solutions using purpose-built tools to safely lift and remove infrastructure from the seabed.

Our pipeline grabs are designed for secure handling of a wide range of sizes and weights, enabling efficient recovery operations with minimal seabed disturbance. Combined with our specialist cutting systems, these tools enable complete, safe and efficient pipeline removal.

Ashtead Technology has a varied range of pipeline recovery equipment.

11

Mattress recovery Ashtead Technology provides a complete subsea mattress recovery service designed to efficiently locate, lift and retrieve concrete mattresses from the seabed. At the heart of this service is our Mattress Recovery Tool, engineered for reliable performance.

The system features offset sliding carriages for variable clamping widths and independently operated tines to accommodate a wide range of mattress sizes.

Integrated cameras and survey equipment ensures accurate mattress location, while onboard thrusters enhance manoeuvrability. Wrap-around ROV grab bars make handling simple and secure.

Operated via a single umbilical for full power and control, the solution enables streamlined mattress recovery operations that reduces vessel time and improves offshore efficiency.

12

Debris clearance Ashtead Technology provides efficient and safe subsea debris and boulder clearance using our purpose-built Orange Peel and Clamshell Grabs.

These robust systems are engineered to securely lift and remove seabed debris, enabling clear access for decommissioning operations.

Their versatile design allows for precise handling in restricted or challenging environments, ensuring minimal impact on surrounding structures.

The grabs can also be integrated with smart survey kits to enhance subsea visibility and operational accuracy, providing a fully informed approach to debris clearance activities.

13

Riser cutting and recovery Ashtead Technology provides a comprehensive riser cutting and recovery package engineered for maximum efficiency and safety.

We eliminate project interface risk by supplying a complete suite of necessary tools and expertise, tailored to your specific methodology. This includes high-capacity hydraulic shears with patented bat blades for effective subsea cutting, coupled with our proprietary ACE winch systems, available in various configurations for controlled recovery.

Our offering extends to bespoke deck handling solutions, leveraging our in-house design and manufacturing capabilities for custom modular cutting tables and specialised overboard chutes.

By delivering this fully integrated solution, we streamline operations, reduce vessel time and provide a single, accountable partner for accelerating the critical riser recovery phase of your decommissioning project.

14

Topside removal and recovery Ashtead Technology has market-leading lifting, pulling and deployment solutions.

We provide specialist winching and back-deck equipment, including linear winches, hydraulic drum winches, reel drive systems, tensioners and A-frames, to support the safe recovery and removal of subsea and topside infrastructure.

With proven expertise in handling complex loads and deploying equipment in challenging offshore environments, these services play a vital role in enabling efficient, controlled and cost-effective decommissioning projects.

15

Experts you can trust Our people are at the heart of every decommissioning project we deliver. From highly skilled engineers to dedicated offshore teams, their expertise, commitment and collaboration drive the success of every operation.

With decades of combined experience across subsea engineering, underwater cutting, tooling design and offshore execution, our people bring practical insight and innovative thinking to complex decommissioning challenges.

Their focus on safety, precision and performance ensures our customers can rely on Ashtead Technology to deliver every project efficiently and effectively - no matter the scale or complexity.

16

Why Ashtead Technology?

At Ashtead Technology, we take a project-driven approach to decommissioning - combining engineering expertise with a global footprint to deliver safe, efficient and cost-effective solutions.

Our teams work closely with customers to understand project objectives, challenges and site conditions, ensuring we always provide the right solution for each project.

With local support across our international hubs, we deliver a consistent, collaborative service, wherever your project is located.

Quality and Safety Industry-leading safety culture and operational standards Robust QA/QC processes Field-proven systems in the world’s toughest offshore environments

Innovative Engineering Continuous investment in new technology Innovative Engineering development End-to-end product Continuous development investment in new Bespoke engineered technology solutions development End-to-end product development Bespoke engineered solutions

Operational Excellence Standardised systems for faster mobilisation and reduced downtime Experienced offshore teams

Collaborative Approach

Transparent communication

Collaborative Approach and flexible contracting

Transparent communication models and flexible contracting models Close collaboration with clients Close collaboration with customers Shared learnings across Shared learnings across decommissioning decommissioning projects projects

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17

Global track record Riser Cutting Operations

Americas

Deepwater decommissioning project

Mattress Recovery for Carbon Capture

Europe

Concrete mattress recovery

Pipe Cutting and Recovery

Middle East

Shallow water infrastructure removal

Precision Cutting for Offshore Jacket Removal

Asia Pacific

Tailored cutting and dredging solutions

Bundle Cutting Exotic Materials 9.9 km flowline safely removed

18

Australia

Tell us about your challenges Ashtead Technology has been helping customers overcome complex offshore challenges with innovative subsea solutions for over 40 years. How can we support your project?

Call us today or explore our portfolio at www.ashtead-technology.com.

Europe

Middle East

+44 (0)1467 622212

+971 2 650 7710

ms.enquiries@ashtead-technology.com

abudhabi@ashtead-technology.com

Asia Pacific

Americas

+65 6545 9350

+1 281 398 9533

singapore.sales@ashtead-technology.com

us.sales@ashtead-technology.com