Monopile 
Circular 
Composite 
EWP/TP 
Covers

About Circular Covers

We are is a private limited company in which the strengths of three experienced firms in offshore wind engineering and composite and metal fabrication are united. We worked together with Enersea, Femto and Theuws on the first prototype of the composite EWP/TP cover for Vattenfall’s wind farm Hollandse Kust Zuid (HKZ).

Together with Enersea, Femto and Theuws we developed the detailed design which led to a first prototype. At the Theuws yard in Wieringerwerf a functional inspection and water test was carried out with positive results mid-June 2020. At the end of June further tests took place at Sif’s terminal at Maasvlakte 2 in Rotterdam. This time the cover was mounted on a mock up monopile so the complete construction could be tested on functionality, load resistance, water tightness and several other aspects. Also here the test outcome was very promising. Following the successful design and construction of this prototype, Vattenfall decided to grant the production order for the complete 140 EWP/TP covers to the parties involved.

Dutch teamwork

Manufacturer of metal and polyester constructions with own engineering department and three different business units: Theuws Metal, Theuws Polyester and Theuws Assembly.

Knowledge-intensive engineering firm specialised in Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) with broad experience in the offshore sector.
Offshore wind engineering expert transforming conceptual designs into ready to use offshore solutions with specialisation in offshore structures.

ISO 9001 Certified Quality Management

Within the demanding environment of the offshore wind sector, precision, operational safety, and reliability are absolute priorities. To guarantee these standards at every stage of our projects, our quality management system is officially certified according to the international ISO 9001 standard by Normec.
 
This certification demonstrates our structured commitment to:
    • Risk Management & Compliance: Ensuring rigorous adherence to strict maritime regulations, technical specifications, and safety guidelines required in offshore energy environments.
    • Operational Excellence: Continuously optimizing our processes to minimize downtime, maximize project efficiency, and deliver consistent performance from consultation through to final handover.
    • Client & Supply Chain Confidence: Providing our tier-1 partners, developers, and operators with verifiable proof that our workflows meet global quality benchmarks.

Through our partnership with Normec Certification, we actively audit, review, and advance our quality assurance parameters to successfully support the global transition to renewable energy.