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Lifting, transportation, roll-up and jack-up of offshore wind components, UK  

 

Overview

As part of a major wind farm project, ALE were given the scope of lifting components, performing multiple site moves, rolling-up and jacking-up the jacket, and loading-out the jacket and topside at the fabrication site in Lowestoft, Suffolk.

 

Services Required

ALE has used its award-winning Mega Jack 800 for the first time in the UK to jack-up a 954t jacket to 14m high.

 

During the project ALE lifted hundreds of components using cranes, telehandlers and chainblocks. The site moves were also performed using 16 axle lines of SPMT in a configuration of 4 file 8.

 

One of the most critical scopes of the project involved the roll-up and jack-up of a jacket, weighing 954t.  Prior to the roll-up operation, four jacking towers were set-up with the first layer of bracing, which saved several days of set-up/installation time. The roll-up was carried out using ALE’s AK912 and the LR1600-2 cranes.

 

The jack-up operation took place one day after the roll-up and utilised ALE’s Mega Jack 800 jacking system. This is the first time the Mega Jack 800 has been used in the UK.

 

To perform the jack-up, suction buckets were positioned under each of the jacket legs and SPMT trailers were used to manoeuvre them into place. The Mega Jack 800 held the jacket in place whilst the suction buckets were welded to the jacket by the client’s operatives.

 

The success of the project depended upon the high level engineering and design works carried out by SLP and ALE and close collaborative working with STDL to get the jacket ready for planned sail away on schedule.

 

The operations are part of the construction of an offshore facility, comprising of a topside and jacket structure, for the Dudgeon Offshore Wind Farm.  The wind farm will be located 20 miles off the coast of Cromer in North Norfolk and, when operational, will have the capacity to power approximately 410,000 homes in the UK.

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