Case Study:
C1-46 Carbon
Steel & Super
Duplex


Location – North Sea, Brent Charlie

Client – Deep Ocean


Decom Engineering played a pivotal role in a subsea
infrastructure decommissioning project at the Brent Field in the Northern North Sea, where waters run deep at 180 meters. This ambitious project involved the removal of pipelines, control umbilicals, and various subsea structures from the seabed, each requiring precise and efficient cutting.

The decommissioning initiative was driven by DeepOcean, who was contracted by Shell. The diverse scope of the project presented a unique set of challenges. The team at Decom was tasked with cutting a wide range of pipe sizes, from 1042mm OD concrete- coated carbon steel pipes to 220mm OD super duplex pipes.

These subsea pipelines needed to be segmented into 9.5-meter sections for efficient recovery to the deck. The conventional diamond wire saws were proving to be time- consuming and impractical.


Solution

Decom Engineering played a pivotal role in a subsea
infrastructure decommissioning project at the Brent Field in the Northern North Sea, where waters run deep at 180 meters. This ambitious project involved the removal of pipelines, control umbilicals, and various subsea structures from the seabed, each requiring precise and efficient cutting.

The decommissioning initiative was driven by DeepOcean, who was contracted by Shell. The diverse scope of the project presented a unique set of challenges. The team at Decom was tasked with cutting a wide range of pipe sizes, from 1042mm OD concrete- coated carbon steel pipes to 220mm OD super duplex pipes. These subsea pipelines needed to be segmented into 9.5-meter sections for efficient recovery to the deck. The conventional diamond wire saws were proving to be time- consuming and impractical.

Material
Ranging from 1042mm OD
concrete-coated carbon steel
to 220mm OD super duplex

Deployment Method
Crane Deployed, Topside
HPU

Water Depth
180m

Average Cut Time
47 mins

Blade Usage
Up to 12 cuts per blade

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