Monopile decommissioning demonstration

MONOPILE DECOMMISSIONING DEMONSTRATION IN THE NETHERLANDS

In 2016, the CAPE VLT-320 was used to decommission a monopile with a slip joint connection with a length of 27 meter, weighting 127 ton with a bottom diameter of 4 meter at the Maasvlakte 2 in the Netherlands.

The pile was installed 7 months prior to extraction using the same equipment. The pile served as a foundation for a demonstration turbine.

The monopile was extracted in record time of 11 minutes after which it was down-ended easily, ready to be picked up and transported to the SIF factory to be extended for installation offshore for the next phase in the demonstration project called the Slip Joint Offshore Research project (SJOR).

Application details

Application

Decommissioning

Pile type

Monopiles

Extraction

15m

PILE DETAILS

Pile type

Monopiles

Pile model

Slip joint

Pile length

27.25m

Pile weight

127t

Pile wall thickness

40-60mm

Pile diameter

3.26-4m

No. of piles

1

PROJECT DETAILS

Period

November 2016

Country

The Netherlands

Location

Maasvlakte 2, Rotterdam

Market

Offshore Renewables

System/end usage

Offshore Wind Turbine & Research

Operator or end customer

DOT

Installation contractor

DOT

Type of vessel

Floating sheerleg

Name of vessel and owner

Matador 3, Bonn & Mees

Mode

Anchors

challenge

Pile installation predictions

challenge

Pile removal

The challenges we’re facing today is our drive to come up with great ideas, solutions and support.

Main Reasons for solution choice

EXTRACTION POSSIBLE

EXTRACTING, LIFTING, DOWNENDING IN SINGLE OPERATION

SELECTED EQUIPMENT

CAPE VLT-320

Equipment configuration

CAPE VLT-320 Single

Eccentric moment

320kgm

Max. line pull

500t

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