7 flanged monopiles for Kaskasi Offshore Wind Farm

7 FLANGED MONOPILES FOR KASKASI OFFSHORE WIND FARM

In 2022, a CAPE VLT-640 Triple was used to upend and drive seven 6.5 meter diameter flanged monopiles weighing up to 850 tonnes on the Kaskasi Offshore Wind Farm project in German waters.

CAPE Holland is looking back on a performance of the CAPE VLT with no mechanical breakdown of the equipment which was for 90% newly built and contained numerous innovations. For the first time ever, flanged monopiles have been upended, lifted and vibrated with CAPE Holland’s patent pending flange clamping system.

After a short learning curve, Seaway 7 used the CAPE VLT to drive a new type of monopiles with Self Expanding Pile Shoe (SEPS). Although the monopiles were not vibrated to end depth, new insights and data have been collected via a newly developed monitoring, logging and survey system. Seaway 7 confirmed the great control of the installation process with the CAPE VLT at Dynamic Positioning.

Wouter van Dalen, Senior Project Manager at Seaway 7“The CAPE VLT was an essential part of the Kaskasi installation spread. The tool enabled Seaway 7 to upend and install monopiles in a single lift to stable penetration depths, therewith reducing installation times and risks.”

Frits Laugeman, Project Director at RWE Renewables, “We regret that the CAPE VLT was only used on Kaskasi on a reduced number of seven monopiles. As a consequence, the tool may not have been able to show its full potential in installing monopiles.

Laurens de Neef, CEO at CAPE Holland, “We like to thank both RWE and Seaway 7 for their trust in CAPE Holland and the co-operation during the project even though the installation scope of the project was significantly reduced by Seaway 7 compared to the original plan. We look forward to our next European wind project later this year where the CAPE VLT will be upending and partly installing flanged monopiles, followed by our first offshore wind project in Japan with the CAPE VLT.”

Application details

Application
Monopile installation
Pile type
Monopiles
Water depth
18-25m
Penetration
Up to 18m

PILE DETAILS

Pile type
Monopiles
Pile model
Flanged
Pile length
64m
Pile weight
850t
Pile wall thickness
Up to 100mm
Pile diameter
6,5m
No. of piles
7

PROJECT DETAILS

Period
March 2022
Sea
North Sea
Country
Germany
Location
Kaskasi Offshore Wind Farm
Market
Offshore Renewables
System/end usage
Offshore Wind Turbine
Operator or end customer
RWE
Installation contractor
Seaway 7
Type of vessel
Floating Heavy Lift Vessel
Name of vessel and owner
Seaway Strashnov, Seaway 7
Mode
Dynamic Positioning

Main Reasons for solution choice

IN COMBINATION WITH DP OPERATED VESSEL THE FASTEST WAY OF INSTALLING MONOPILES

LOW NOISE EMISSION

UPENDING, LIFTING, DRIVING IN SINGLE OPERATION

SELECTED EQUIPMENT

CAPE VLT-640

Equipment configuration
CAPE VLT-640 Triple
Eccentric moment
1,920kgm
Max. line pull
1,500t

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