Subsea Waterjet Cutting with External Cutting Tools (ECTs)

NCA’s ROV-carried External Cutting Tools (ECTs) are based on NCA’s powerful Abrasive Water Jet Cutting (AWJC). The AWJC method uses a high energy jet of water-borne abrasive particles which will cut even the hardest steel alloys quickly and safely. The ECTs are carried and mechanically operated by a work ROV and require only the high pressure slurry hose from surface. The slurry hose and nozzle can be docked to the ECT by the ROV, providing maximum flexibility and operational efficiency.

The ECTs come in several different sizes covering 16" to 72" OD pipe. Each tool is neutrally buoyant in water and consists of a hydraulic clamp, a C-ring that rotates the nozzle around the pipe, and an optional nozzle with axial functionality. All tool functions are controlled via the ROV, while the high pressure pump and abrasive mixer units are operated on deck.The ECTs are deployed separately from the ROV in tool baskets or with a unique docking system that enables the ROV to mechanically and hydraulically connect to the ECT, subsea.

Applications:

• Sub sea diverless cutting of jacket legs, pipelines and bracings
• Sub sea “castellated” (shaped) or window cutting in tubular

Features and Benefits:

• Diverless cutting
• Extreme cutting power – can cut more than 10" wall thickness and several layers
• Superior cutting speed – up to 20"/min
• Operational friendly handling – reduced time between cuts
• Cutting method is independent of internal stresses in material being cut
• Verification of cut by use of camera or hydrophones is available
• Can do multiple cuts in one deployment
• All tool functions controlled from the ROV
• Multidimensional clamp – no top-side changes required to change sizes within machine’s range
• All tools can also be installed by divers
• Castellated or window cutting

NCA also has a range of diver installed sub sea AWJC tools.