Norson Completes Deepwater Project Using Remote Flooding Technology

Norson Services has just completed another deepwater pipeline operation using its subsea remote pipeline flooding and pigging system.

The Aberdeen-headquartered multi-disciplined engineering company was awarded a multi-million dollar contract which involved all the subsea based flooding and pigging operations on the Lobito Tomboco offshore Angola.

Norson Services, which is now a UK market leader in pipeline, process, and umbilical services, developed the subsea remote flooding module to flood and pig pipelines in deep water. Using their innovative Remote Flooding Module (RFM) and Subsea Hydrotest Pump (SHP) on behalf of Subsea 7 and Chevron, Norson flooded and pigged 15 subsea pipelines from 3" to 12" in diameter, 4 km to 9 km in length in water depths of over 550 meters, with filtered, treated water all in accordance with specifications.

"Newly installed pipelines are laid on the seabed at atmospheric pressure," said Les Graves, director of Norson's Pipeline, Process, and Umbilical division. "Our remote flooding module uses the available seawater pressure outside the pipe as a source of power and water to flood and pig the lines whilst still meeting the desired filtration and chemical protection specifications. The benefit of our remote system is that it is ROV friendly and removes the need for connection to a surface vessel, thus saving substantial costs and time."

A multi-disciplined engineering company, Norson Services has two divisions: pipeline, process and umbilical services (PPU) and hydraulics. With offices in Aberdeen, Rosyth, and Houston, the company employs over 120 people with a turnover of 16 million.

The PPU division focuses on the pre-commissioning of pipeline, piping and control systems. Using advanced techniques, Norson develops testing and cleaning processes to suit customers' specific requirements. Designed to remove a range of contaminants, Norson's solutions prevent system damage and achieve specific cleanliness criteria. Whilst the hydraulics division is divided into two main business streams, the design and construction of hydraulic systems together with system and component maintenance, and the supply of hydraulic components.

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