Trianel Windpark Borkum II consists of 32 offshore wind turbines of type "Senvion 6.2M152 Power Upgrade". Due to damage, the main bearing units have to be replaced.
The subsequent contractual partner is responsible for all tasks associated onshore with the refitting and reuse of offshore main bearing units (MBU) as well as offshore with the provision of a suitable vessel, equipment and personnel for the exchange of MBU.
1. ONSHORE WORKS: refitting and reuse of offshore MBU with all the associated work
a) Preparation: Project planning incl. planning of necessary supplies; concepts and protocols
b) Execution:
- Documentation and communication (DPR, protocols, progress reporting)
- Order for offshore return and reuse defect MBU: (1) Load in/handover defect MBUs; (2) Transport to de-assembly site; (3) De-assembly of defect MBUs; (4) Transport to overhaul site; (5) Refit rotor shaft (test plan, testing, evaluation); (6) Transport to assembly site; (7) Assembly bearing set und rotor shaft; (8) Storage; (9) Transport from storage to quayside for load out
- Provision of transport and lifting equipment
c) Post-processing: Final documentation of refitting and testing; lessons learnt
2. OFFSHORE WORKS: provision of vessel, equipment and personnel for the exchange of the MBU with all the associated work
a) Preparation: Project planning; surveys and positions; marine and vessel documentation; GA and sea fastening setup; lifting plans; work procedure; HSE/bridging docs; equipment and tools (incl. maintenance and certification)
b) Execution:
- Documentation and communication (DPR, protocols, progress reporting)
- Mob/demob vessel, equipment, personnel
- Order: (1) Load out; (2) Sea fastening transit out; (3) Transit out; (4) De-commissioning (CTV); (5) Lifting and replacement operations (rotor star deinstallation, gear box deinstallation, MBU deinstallation, Motion damper installation, MBU installation, gear box installation, rotor star installation); (6) Transit OWF; (7) Commissioning (CTV); (8) Sea fastening transit in; (9) Transit in; (10) Load in
c) Post-processing: As built documentation; lessons learnt