Rotech Subsea delivers cable de-burial, cut & recovery and post-lay trenching offshore Germany


LEADING provider of subsea jet trenching and excavation tools to the energy industry, Rotech Subsea, has successfully delivered cable de-burial, cut and recovery and cable burial works for a major subsea solutions provider in the North Sea, offshore Germany.

Deploying its TRS2 jet trencher, Aberdeen headquartered Rotech Subsea completed deburial of over 600m of damaged subsea umbilical buried at 4m MSBL. Operating in very soft sands which backfilled quickly the TRS2 tool reached a deburial depth of 5m+ in just one pass, positioned at 2.5m – 3m above the seabed progressing at 4m/min during trenching operations. 

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Rotech’s patented RSG-C subsea tool was deployed to grab and cut the cable in two locations, recovering the cable to deck. Survey positioning of the tool was used to locate the RSG-C tool in the correct location and the tool-mounted sonar and camera were used to confirm the cable had been successfully grabbed and latched within the cutter. The RSG-C completed the cut of the 100mm cable in < 10 minutes with the cable was recovered to deck.

Post-lay trenching operations saw the TRS2 deployed. It completed trenching in two passes – the first at 3m/min with the second pass completed at 5m/min. For both passes the TRS2 tool was operating at 2m above the seabed.

Speaking about yet another European OWF scope delivered on time and on budget, Rotech Subsea Director of Subsea, Stephen Cochrane, commented: 

“This three-part scope is typical of the offshore wind subsea cable remedial and trenching works we have become known for in Europe. We deployed our TRS2 tool for the cable trenching because its sector-leading high flow allows for very large amounts of soil to be displaced quickly. 

“Though our range of non-contact CFE, Suspended Jet & Hybrid Jet Trenching tools have been in huge demand in Asia and the US recently, Europe remains a key market for us and it was great to deliver yet another successful OWF scope for a long-term client in European waters.”

Rotech Subsea’s research, development and engineering team has created a suite of 18 sector-leading non-contact CFE, Suspended Jet & Hybrid Jet Trenching tools in-house at its Aberdeen HQ. Withenhanced capabilities, Rotech Subsea’s CFE & Hybrid Jet Trenching suite of tools is firmly established as the method of choice for offshore wind farm cable trenching and excavation in Europe and beyond.

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