CEM Installation from Pipe Laying Vessel

Background

ClampOn’s Corrosion-Erosion Monitor (CEM) has been widely used in subsea installations for monitoring the pipelines. However, for the first time, the CEM was installed topside onboard a pipe-laying vessel and submerged as a fixed part of the pipeline. This installation was part of a large gas export line in the North Sea.

Challenge

The primary challenge was to ensure the CEM could withstand the bending and twisting of the pipeline during deployment from the pipe-laying vessel. Traditional subsea installations do not face this issue, making this a unique and complex task.

ClampOn Subsea CEM

Solution

ClampOn developed a clever rotating protective cover for the CEM. This cover allowed the instrument to move and adjust during the deployment process, ensuring it remained intact and functional. The complete unit was installed topside on the vessel and then lowered onto the seabed as part of the pipeline. The CEM includes transducers clamped to the pipe under the protective cover, transmitting signals to an electronic canister. As it is located far away from the shore, subsea trees, manifolds, or any other infrastructure, the system operates stand-alone, using battery as its energy source.

Result

The CEM was successfully installed and is now monitoring corrosion on the gas pipeline. It provides continuous information on the pipeline wall thickness, operating independently with a battery as its energy source. This innovative installation method has proven effective, ensuring the Corrosion-Erosion monitor can function in challenging deployment conditions

ClampOn Subsea CEM 2

Field cases

  • All field cases