FIRST VS. SECOND NORTH SEA PROTOTYPE

Last year in June, we deployed our first prototype in the North Sea. With the system changing from a moored concept to free-floating one, the barrier’s stiffness needed to change in order to maintain its U-shape. The first prototype consisted of a rubber floater with inflatable chambers for buoyancy. In the new design, the floater is now a solid wall HDPE pipe.

It is important to note our first prototype was testing our moored concept, whereas the new prototype is only testing the durability of the new system components. Therefore, the test in the North Sea will not be a drifting system; it will be moored to the same test location as the previous prototype (12 nautical miles off-shore from The Hague), kindly allotted to us by the Dutch government. By mooring this test, the components are subjected to far higher forces than if the segment would be free-floating.

DEPLOYMENT

There are many steps to be taken while deploying technology offshore. The first test segment was first assembled onshore, transported to port, taken offshore where all connections were made, lifted from the vessel into the water and lastly connected to the buoys at the installation site. Just as for the previous North Sea test, we are very grateful to receive help from our off-shore partner Boskalis.

During the installation process, we found one of the mooring lines had detached from the anchor buoy and dropped to the sea bed, which meant one anchor buoy only had two mooring lines instead of three. Attaching the detached mooring line would require special equipment, which the installation vessel was not equipped with for this operation. A decision had to be made whether to return to port to pick up a grapnel, or to go ahead with two mooring lines instead of three. Going back could have delayed the installation up to a week. Our engineers at The Ocean Cleanup’s HQ quickly ran simulations to assess the possibility of relying on two mooring lines, which turned out to be sufficient not to create a short-term risk, after which the installation could proceed. The installation team will return with the right equipment within the coming days, to attach the last mooring line.

UPDATE SEPTEMBER 26: SECOND SEGMENT DEPLOYED

After successful assembly on September 22, we deployed the second test segment in the North Sea on September 26. This second segment features our new rail suspension design.

WHAT’S NEXT

The two test segments will remain in the North Sea up to 6 months, to assess the endurance of the elements and their connections.

Follow us on social media to stay up to date on our North Sea test.

Are you passing by the test location and seeing something strange? Please contact us through emergency@theoceancleanup.com and we will follow up immediately. Please note: Only prototype related matters will be answered through this email.