Decom Engineering was engaged by MMA to deliver a critical subsea cutting operation as part of Woodside’s decommissioning activities in the Stybarrow fields, offshore Western Australia.

The project required the precise cutting of a 4” flexible flowline at a water depth of 850 meters to enable safe recovery and inspection of the infrastructure. The C1-24 chop saw fleet (units 102 and 108) was deployed via crane and powered subsea by an ROV, with Decom-supplied hotstabs supporting the operation. The goal: clean, efficient cuts to facilitate NORMs (Naturally Occurring Radioactive Materials) inspection and ensure the line was free of internal obstruction prior to recovery.

The C1-10T Tracksaw achieved cutting speeds approximately 10 times faster than a traditional super grinder, significantly reducing subsea intervention time. Its clamped design eliminated kickback, protecting blade tips from breakage and extending blade life throughout the operation.

The saw delivered consistent, controlled cuts across the DTM structure, enabling efficient decommissioning activities while being easily handled by a single ROV. The custom-engineered solution ensured safe, reliable, and rapid cutting performance in deepwater conditions.