Siem Offshore Contractors says that all 70 km of inter array grid cables on the Nordsee One Offshore Wind Farm in the German Bight of the North Sea have now been installed, terminated, trenched and tested three weeks ahead of schedule.
All 59 cables were successfully installed using the “Siem Duo” consisting of the Cable Lay Vessel (CLV) Siem Aimery and the Installation Support Vessel (ISV) Siem Moxie. These were supported by a further in-house Multi-Purpose Vessel (MPV) Siddis Mariner, which provided subsea support for the installation of cable protection systems and concrete mattresses. The Siem Duo demonstrated their advanced weather operability during this project and particularly with gangway access being completed in up to significant wave heights of 3m from the (ISV) Siem Moxie.
The CLV Siem Aimery loaded in excess of 70km of aluminium core submarine composite cables directly into its two turntables in addition to cable protection systems, which were loaded into a dedicated under-deck storage compartment.
In parallel the ISV Siem Moxie assisted the CLV Siem Aimery with the cable pull-in, termination and testing activities deploying its offshore support units (OSU) equipped with generators, pull-in winches, tools and equipment for personnel life support at the individual offshore work sites. The OSUs were transferred using the vessel 3D motion-compensated crane, while the vessel active motion-compensated “Walk to Work” (W2W) gangway was used to facilitate more than 8,000 personnel transfers to and from the individual foundations and offshore substation. The ISV Siem Moxie had already established a track record of over 30,000 successfully executed personnel transfers since delivery in April 2014, proving its capability as one the most advanced, safe and efficient service operations vessels available in the market.
Mr. Regis Rougier, Managing Director of Siem Offshore Contractors stated today: “It is a pleasure to confirm the successful completion of our first project utilising the “Siem Duo”. Both the crews of the Siem Aimery and Siem Moxie have made us proud by consistently delivering high quality execution while concluding the project ahead of schedule! We are looking forward to the next challenge for our teams and of course the next project for our vessels.”
Harald Poppinga, Project Manager for Siem Offshore Contractors added: “It has been a pleasure to be part of this milestone achievement – envisioned in 2013 and delivered in 2016!”
Siem Offshore Contractors was awarded the engineering, procurement, installation and commissioning (EPIC) contract for the IAG cable system of the Nordsee One OWF in 2014. The 54 WTGs of the Nordsee One project are located 40km north of the island of Juist in water depths of up to 34 metres.