BorWin5 Onshore – De Romein GmbH involved in Bringing about the Energy Turnaround
BorWin5 construction site
Major project BorWin5 for safe and low-loss transport of green offshore electricity progresses – De Romein GmbH builds land route from Hilgenriedersiel to Garrel converter station with egeplast Protection-Layer Pipe System Power Protect. To connect the EnBW He Dreiht offshore wind farm with 230 kilometres between the offshore platform BorWin epsilon and the Garrel/Ost converter station, TenneT has initiated the grid connection project BorWin5. De Romein GmbH is taking on the civil engineering and cable laying works on the land line and relies on egeplast Power Protect PE protective pipe systems for the 55 km long section to be piped.
The BorWin5 project by TenneT Offshore GmbH includes the establishment and operation of a grid connection between the offshore platform BorWin epsilon and the Garrel/East converter station in the Cloppenburg district. The makeup of the 320-kV-DC BorWin epsilon – Garrel/East (BorWin5) line which features a total length of around 230 km is complex. Roughly speaking, it is comprised of an offshore and an onshore segment. From the BorWin epsilon offshore platform, the line initially runs across the Exclusive Economic Zone (EEZ) offshore and then extends to the border of the 12-nautical mile zone. From there, it runs offshore to the island of Norderney and then across or underneath the island , followed by a segment across the Mudden Sea (mud flats) to the landing point close to Hilgenriedersiel and then further along the onshore land line to the converter station Garrel/East. The highvoltage cable system for BorWin5 consists of three cables (two conductor cables and one control cable) jointly laid in a cable trench.
Complexity of the construction project
The overall contract covering the turnkey installation of the BorWin5 high-voltage cable system was awarded to NKT HV Cables AB, and the civil engineering works and cable laying operations from the BorWin epsilon offshore platform to Hilgenriedersiel, where the route comes on shore, have already been completed over the recent years. As a subcontractor of NKT HV Cables AB, De Romein GmbH has been awarded the contract covering the civil engineering works and cable laying operations related to the land line from Hilgenriedersiel to the Garrel converter station.
Ronny Buit, De Romein Site Manager for the BorWin5 HDD project, uses specific figures to illustrate the volume and complexity of the construction project: “Approximately half of the approx. 115-km route requires ducting, meaning that approx. 115 km of pipes will be needed. This means that several truckloads of egeplast Power Protect PE 100 225 x 20.5 mm protection pipes per week need to be delivered directly to the cable route to meet the continuing demand for welded pipe strings for the six HDD units. The mere volume of 45,000 excavator mats which are constantly being installed, picked up and transported illustrates the scope of this project. The same holds true for the 112 cable drums to be transported, each of them wrapped with two km of earth cable and weighing 40 tons, which add up to a total weight of 4,500 tons. Without any exception, these cables first need to be unloaded at the cable hub at the port of Emden, from where flat-bed trucks transport them to the various unreeling sites right next to the respective cable route where they will finally be laid or inserted.”
| Project data: | |
|---|---|
| Project description: | 320-kV-DC line BorWin epsilon – Garrel/East (BorWin5) |
| Challenges: | Establishment of a cable protection system for 320 kV high-voltage-DC transmission (HVDC) |
| Solution: | Utilisation of the Power Protect cable protection system made of PE 100 |
| Installation: | Trenchless installation (HDD) |
| Pipe system: | 115 km Power Protect PE 100 d 225 x 20,5 mm SDR 11 136 km Macroduct PE d 50 x 4,6 mm SDR 11 incl. accessories (200 x Golden Joint) / electrofusion couplers (190 x d225) / dual plug-in connector (50 x d50) |
| Parties involved in the project: | Client: nkt (cable supplier) TenneT TSO Gmbh (grid operator) TenneT Offshore GmbH (offshore grid connections) Planning & Installation: De Romein GmbH |
Contact
Heiner Dokters
egeplast international GmbH
Email: Heiner.Dokters@egeplast.de
Tel.: +49 2575 9710 141
