Monopile decommisioning on amalia offshore wind farm

MONOPILE DECOMMISIONING ON AMALIA OFFSHORE WIND FARM

In 2018, the CAPE VLT-320 Tandem was used to upend and install a 4 meter diameter monopile with a length of 56.6 meter at the Amalia Offshore Wind Farm off the Dutch coast. In October 2021, the CAPE VLT-320 Tandem was used again to decommission the monopile as part of the DOT FOX project.

With the extraction in 2021, it was shown that even after being subjected to the harsh North Sea environment for three years, the CAPE VLT was able to loosen and extract the pile without any trouble. After the extraction the pile was installed again and extracted whilst performing a series of tests to assess soil response and gain further knowledge of the offshore vibro lifting technology, like controlling verticality within the required tolerances.

Application details

Application
Decommissioning
Pile type
Monopiles
Water depth
22-24m
Extraction
19m

PILE DETAILS

Pile type
Monopiles
Pile model
Tapered
Pile length
56.6
Pile weight
300t
Pile wall thickness
40-60mm
Pile diameter
3.26-4m
No. of piles
1

PROJECT DETAILS

Period
October 2021
Sea
North Sea
Country
The Netherlands
Location
Amalia Offshore Wind Farm
Market
Offshore Renewables
System/end usage
Offshore Wind Turbine
Operator or end customer
DOT
Installation contractor
Heerema Marine Contractors
Type of vessel
Semi-Submersible Crane Vessel
Name of vessel and owner
Sleipnir, Heerema Marine Contractors

Main Reasons for solution choice

EXTRACTING, LIFTING, DOWNENDING IN SINGLE OPERATION

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

CONTROLLED INSTALLATION

SELECTED EQUIPMENT

CAPE VLT-320

Equipment configuration
CAPE VLT-320 Tandem
Eccentric moment
640kgm
Max. line pull
1,000t

offshore
vibro
technology

Discover how its unique features will uplift your next project; download the offshore vibro technology guide.

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