Drive and extract a 6.5 meter diameter monopile

DRIVE AND EXTRACT A 6.5 METER DIAMETER MONOPILE

In 2019, a CAPE VLT-320 Tandem was used to drive and extract a 6.5 meter diameter monopile of 60 meter length and weighing 330 ton on the Hollandse Kust Zuid Offshore Wind Farm off the Dutch coast.

As part of a new motion compensated gripper frame test with Dynamic Positioning installation the CAPE VLT was used as the pile had to be removed after installation and offered the opportunity to perform the test multiple times.

Application details

Application

Monopile installation and extraction

Pile type

Monopiles

Water depth

20m

Penetration

16m

Extraction

16m

PILE DETAILS

Pile type

Monopiles

Pile length

56,6m

Pile weight

586t

Pile wall thickness

60-75mm

Pile diameter

6,5m

No. of piles

1

PROJECT DETAILS

Period

October 2019

Sea

North Sea

Country

Netherlands

Location

Hollandse Kust Zuid

Market

Offshore Renewables

System/end usage

Installation and decommissioing test

Operator or end customer

Seaway 7

Installation contractor

Seaway 7

Type of vessel

Floating Heavy Lift Vessel

Name of vessel and owner

Seaway Strashnov, Seaway 7

Mode

Dynamic Positioning

Pile removal

Pile installation efficiency

Pile installation predictions

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

LOW NOISE EMISSION

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

SELECTED EQUIPMENT

CAPE VLT-320

Equipment configuration

CAPE VLT-320 Tandem

Eccentric moment

640kgm

Max. line pull

1,000t

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