Developing technology in the offshore sector

OD materials of any type, this advanced technology was designed to meet the unique challenges posed in a conductor removal scope on the Brent Charlie platform in the North Sea, and sets the foundation for in-built buoyancy integration.

Due to the complexity of the conductor guideframe layout and restricted 3 m width access, the Chopsaw had to be neutrally buoyant in seawater and easily maneuverable with a single ROV. Weighing approximately 6700 kg in air but only 50 kg in seawater and with a blade diameter of 2100 mm, the C1-32 assisted with the cutting of 40 Brent Charlie multi-string conductors with an OD of 30 in., many with the added challenge of loose internal strings.

From neutrally buoyant to ultra-light, this year Decom launched the C1-16UL Chopsaw. The C1-16UL is designed to cut a wide range of materials but excels with its add-on mooring chain retention clamps, allowing for precise cutting without the risk of dropping anything to the seabed. This Chopsaw was specifically engineered to handle the demanding task of cutting flexible risers and mooring chains under tension, Riser Turret Moorings and Deepwater Tensioned Moorings. It incorporates several innovations, including a subsea-grade aluminium frame, replacing traditional steel construction, and a high-torque direct-drive hydraulic motor which has eliminated the need for a gearbox without sacrificing performance.

This tool is currently deployed on a 45 day campaign in the Shenandoah Field, Gulf of Mexico, which includes cutting studless mooring chains in less than 20 minutes and incorporates a linked retention system to secure severed sections. Another exciting development is Decom Engineering’s linear cutting C1-10T Tracksaw which is designed for optimal performance in confined spaces and challenging environments. Its compact design allows it to fit into tight areas with minimal headroom, making it ideal for both subsea and industrial projects.

The C1-10T has been engineered to handle complex cutting tasks, further enhancing Decom Engineering’s capabilities in offshore and industrial applications. With its ability to execute linear cuts in limited access areas and remove excess webbing, the C1-10T offers a new level of versatility and whether used for flat plate, gussets, rib plates, or standard beam sections, this tool delivers precision and efficiency in demanding cutting scenarios.

The continual development and deployment of new tools and technology such as the C1-32, C1-16UL, and C1-10T has enabled Decom Engineering to further capture key markets, positioning the company for a successful expansion into North and South America.

Advancing research and development

The C1-24 Chopsaw has been instrumental in shaping Decom Engineering’s research and development efforts. Its successful deployment on high-profile global projects has provided critical insights that have driven the refinement of cutting technologies. By overcoming diverse operational challenges in locations such as the North Sea, the Gulf of Mexico, and the Gulf of Thailand, the C1-24 has proven to be an invaluable tool in subsea decommissioning and offshore recovery.

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