2000th Dive Achieved on The Greater Gabbard

Case Study Overview

Support Fluor Ltd, the principle contractor, with all diving operations.

Red7Marine is using the OSV Relume, a DP2 class support vessel to conduct her operations and all equipment and procedures are IMCA compliant. The dive team have work continuously throughout the year and also assist in many other ways including pile cleaning, cable recovery, generator installations and many other non-diving related activities. The dive team have thus far completed over 2000 dives in a little less than two years and the project is continuing beyond this point.

All diving work has been performed in poor visibility and in tidal conditions.

At a glance

  • Location: The Greater Gabbard Offshore Windfarm
  • Date: May 2009 – On-going
  • Programme Duration: 23 months so far
  • Project Number: 2068
  • Value: £ xxx
  • Client: Fluor
  • Principal Contractor: Red7Marine

The Solution

The initial contract was to install J-tubes to the outside of each Wind Turbine Generator (WTG) using a R7M designed bespoke pile based crane. However, as the project progressed, a more varied work scope presented itself. Below is a list of typical tasks carried out by Red7Marine to date.

Diving and subsea work:

  • Ordnance location and disposal
  • J-tube installation and removal
  • Concrete mat installation
  • Dredging operations
  • Activation and removal of Tekmars Teklink cable protection system
  • Reference cell installation
  • Inter Array cable removal and recovery
  • Surveys as directed

All diving works are being carried out using Nitrox instead of air as a breathing medium to extend the bottom times and thus productivity in water depths that average 30m. All work scopes being carried out follow Red7Marine generated procedures and are completed following IMCA good practice guidelines and conform to the HSE Diving at Work Regulations 1997.

Greater Gabbard

Non-diving operations:

  • Navigation light installation and removal
  • Cable recovery
  • Pile cleaning
  • Generator installation and recovery
  • TP access works

Red7Marine personnel have been, and continue to be, intimately involved in all aspects of the contract, where asked by the client. When 3rd party contractors are required by the client Red7Marine has endeavoured to source and project manage
the extra work, often utilising our own personnel to supplement the contractors own work force.

The needs of the client often change, and as can be seen, vary extensively, but Red7Marine have continued to adapt to these changes and managed to step up to the challenge. We remain one of the longest serving sub-contractors on the project and fully intend to continue working on the project until its eventual successful conclusion.

Greater Gabbard
THE MARINE PARTNER OF CHOICE

SEE RELATED CASE STUDIES

Brighton

Brighton Marina
Phase 2

In order to accommodate a new luxury apartment block in Brighton, part of the marina needed to be reclaimed using sheet piled cofferdams. This would enable the water to be kept out and foundations to be built for the stunning seafront properties. Red7Marine supported the installation of a sheet pile twin wall cofferdam.

Read more →

Oldbury

Oldbury

Red7Marine installed replacement Active Effluent Discharge Lines at Oldbury power station as part of the on-going care and maintenance works. Red7Marine’s previous project experience on similar projects consisting of works on subsea pipeline and outfalls at Bradwell and Sizewell nuclear power stations, positioned the company as the ideal marine partner for client, Magnox.

Read more →

Emirates

Emirates Cable Car

The Emirates cable car was installed to provide a pedestrian link across the River Thames between the Royal Docks and the Greenwich peninsula. Red7Marine worked with Bachy Soletanche in a joint venture to install the foundations for the one-kilometre long cable car using marine rotary bored piling.

Read more →

Battersea

Battersea River Pier

Red7Marine secured a contract at Battersea in December 2016 to install new tubular driven steel mooring piles for the Battersea Power Station river bus pontoon installation which is planned to be operational in Autumn 2017. Transport for London (TFL) decided to extend the river bus service after the number of housing developments at Battersea began to increase.

Read more →

Middleton

Middleton Sands Navigation Marker

This fast turn-around marine construction project involved the installation of a new tubular steel navigation marker pile at Middleton Sands, Barrow-in-Furness in 2017. The navigation marker was required to identify the sub surface obstructions and enable other vessels in the area to operate safely.

Read more →

Liverpool 2

Liverpool 2 Deep Water Port Extension

Red7Marine was the marine partner of choice for BAM Nuttall when they constructed a piled combi-wall as part of the Liverpool 2 Dock Expansion that began in 2014. The construction of the container terminal was supported by four of Red7Marine’s jack up barges; the Haven Seariser 1, Haven Seariser 2 and the Haven Seariser 3 and the Haven Seajack as it carried out rock socket piling works.

Read more →

Weston Super Mare

Weston-Super-Mare

The Red7Marine team was chosen to provide specialist marine plant and personnel to aid the redevelopment of the Weston-super-Mare Grand Pier after it was destroyed in a fire in 2008. Red7Marine supplied the Haven Seajack 4 assisted in the pier construction works. Its previous experience in pier and marina construction works made it the ideal project partner for this development.

Read more →

Bradwell

Bradwell Power Station Barrier Wall Removal

Red7Marine is a leading provider of equipment for marine demolition and is skilled in dismantling structures that are beyond the reach of ordinary demolition contractors. In 2012, Red7Marine removed approximately 800 tonnes of steel in the Blackwater Estuary from the Bradwell nuclear power station water intake structure.

Read more →

Fingringhoe

Fingringhoe Firing Ranges

Red7Marine installed scour protection and provided remediation on damaged sections of the flood defences to preserve areas of the salt marsh at the Fingringhoe firing ranges in Essex. Scour protection and remediation techniques are used to control erosion in both estuarine and the offshore environments.

Read more →

Get in touch with our expert team

or speak to our team: 01255 886710

British Standards ISO British Standards ISO British Standards ISO Achilles Building Confidence IEMA Construction Line Chas Ijuboa CPA National Workboat Association ICE Mates in Mind AF Covenenant Gold award

“Great Yarmouth Third River Crossing: The Red7Marine team have played a big part in the success of the cofferdam piling works. Once again, the spirit of cooperation between all involved has been exemplary and this goes a long way towards making life easier for all involved. I would like to pass on my personal thanks to everyone at Red7Marine for your help and I look forward to working with you all again at some point in the future.”

Richard Hayman, Construction Manager BAM Nuttall