Project: Rampion Phase 1
Client: E.ON Distance/depth: 75km/0.8m TOP Description: Installation and burial on first phase of 33kv array cables on the Rampion Offshore Wind Farm Date: 28/08/16 – 20/11/16 Phase 1 of the Rampion project consisted of cable loading transport and installation of 60 infield array cables with a total length of 75km.
The project included all engineering, planning and project management associated with the work. Global Symphony carried out the cable loading from the cable manufacturer in the North East of England and transported the cables from the factory to the wind farm where the cables were installed. This included fitting cable protection systems into wind farm foundations and securing the cables on the wind turbine foundations ready for termination.
Following the cable lay, the 60 cables were trenched using the Q1400 trencher with its mechanical cutting tool, to a depth of 800mm in particularly hard seabeds consisting of clays chalks and flints. Phase 1 was carried out on time, according to plan and within budget. This work was awarded as follow on work from the successful campaigns on Eon Humber Gateway.
Project: Machar Umbilical Trenching – BP ETAP Oil Field
Client: Bibby/ BP Distance: 600mm TOP Description: Jetting and cutting on ETAP replacement umbilical Date: 14/07/16 – 05/08/16 In the redevelopment of BP’s ETAP oil field the Q1400 trenched and buried the Machar replacement umbilical. Global Offshore carried out all engineering and planning for the umbilical burial, with soil analysis needed to ascertain the best burial method as more sands and very hard clays were expected in this part of the Central North Sea.
Trenching plans and procedures were developed, and both cutting and jetting methods were used also utilising the Q1400 deck transfer system in order to give the most cost effective burial solution for the project. With an overall length of 35km the Q1400 was used in jetting mode for c. 21km while the cutting tool of Q1400 was used for c. 14km. A total of four areas were initially trenched using the Q1400 cutting tool with one switch over from cutting to jetting after which the remainder of the umbilical was trenched using the jetting system. The entire project was completed within 24 days.
Project: Lincs Offshore
Client: Centrica
Distance/depth: 16km/800mm TOP
Description: Inaugural trenching project using the Q1400 in mechanical cutting mode, scope of work was to post trench 16x120mm diameter array cables
Date: 12/07/12 – 28/09/12
Project: Humber Gateway
Client: E.ON
1. Distance/depth: 3.0km/1m TOP | Description: Trenching trials undertaken for E.ON at their Humber Gateway Offshore Wind Farm using the Q1400 in chain cutting configuration, trialling different chain configurations | Date: 27/01/13 – 07/02/13
2. Distance/depth: 43.4km/600mm TOP | Description: Chain cutting of 77 cables at Humber Gateway Offshore Wind Farm; inter array cables and 2 export cables, average length 800m | Date: 15/08/14 – 09/03/15
3. Distance: 7.0km | Description: Installation of 8 array cables and second end pull-in to TP of 2 prelaid cables. Work carried out during trenching campaign | Date: 15/12/14 – 24/02/15
Project: Corrib
Client: Technip/Shell
Distance/depth: 16km/600mm TOP
Description: Jet trenching of 16km on Shell Corrib umbilical from shallow water 12m LAT out to deep water 60m
Date: 29/05/13 – 24/06/13
Project: Arkwright
Client: Ocean Installer/Talisman
Distance/depth: 10km/800mm TOP
Description: Chain cutting of 10km umbilical replacement working in 100m water depth in central North Sea in mixed soil conditions with sand and hard clays
Date: 02/07/13 – 14/07/13
Project: Golden Eagle
Client: Technip
Distance/depth: 4.5km/600mm TOP
Description: Chain cutting on Nexen Golden Eagle development on 4.5km umbilical where very fast track project was completed
Date: 25/09/13 – 30/09/13
Project: Bittern
Client: Ocean Installer/Shell
Distance: 22.5km
Description: Chain cutting on 2 Shell Bittern umbilical replacements; 1 x 2.5km and 1 x 20km
Date: 21/10/13 – 14/11/13
Project: Gwynt y Môr
Client: RWE
Distance/depth: 32.0km/1.2m TOP
Description: Chain cutting of 40 inter array cables at the Gwynt y Môr Offshore Wind Farm, each cable approximately 800m long, working in extremely variable soils
Date: 24/01/14 – 29/06/14
Project: Gemini
Client: Van Oord
1. Distance/depth: 130km/1.5m TOP | Description: Jet trenching 200km of 132kv export power cable for Gemini Offshore Wind Farm | Date: 06/07/15 – 01/10/15
2. Distance/depth: 60km/1.5m TOP | Description: Jet trenching 150x Gemini Offshore Wind Farm array cables | Date: 16/10/15 – 10/05/16
Project: Borkum II
Client: VBMS
Distance/depth: 1km/1.5m TOP
Description: Jet trenching on Borkum II Offshore Wind Farm for array cable replacement
Date: 05/08/15 – 09/08/15
Project: Baltica
Client: Prysmian
Distance/depth: 4km/3m TOP
Description: Remedial jet trenching on TDC fibre optic cable
Date: 06/12/15 – 27/12/15
Project: Egmond aan Zee
Client: VBMS
Distance/depth: 0.8km/1.5m TOP
Description: Jet trenching on Egmond aan Zee Offshore Wind Farm for replacement array cable
Date: 16/01/16 – 20/01/16
Project: Ivar Aasen Norway
Client: EMAS/Aker BP
Depth/cover: 500mm TOP/ 300mm
Description: Jet trenching on 1 umbilical and 3 pipelines 2 x 8” and 1 x 10”on Ivar Assen project
Date: 10/06/16 – 18/06/16
Project: Engy Cygnus
Client: Bibby/Engie
Distance: 600mm TOP
Description: Jet trenching of 8km long umbilical in the southern North Sea
Date: 10/11/2016
Project: Shapinsay to Stronsay Power Cable Repair
Customer: Scottish & Southern Electricity Networks
Vessel: Global Symphony
ROV: Q1400
Location: Orkney Isles
Activity: Power cable repair
Year: 2018
Duration: 4 weeks
Global Offshore was awarded a cable repair/replacement project by Scottish and Southern Electricity Networks (SSEN) for the Shapinsay to Stronsay power cable fault. The fault occurred just as the Global Symphony was finishing the Rousay to Westray cable replacement scheduled project.
Responding quickly, the Global Offshore team carried out planning and contract negotiation simultaneously, which enabled the replacement to be conducted within just four weeks of the cable fault being identified.
SCOPE OF WORK
> Cable loadout > Pre-lay survey > Route planning > Shore landings > Cable installation > Cable jointing > Rock bag installation > Post burial survey
The ability of the team to respond to a cable fault and repair it within a four week window cemented customer relationships and ensured on-going electricity provision to the remote Orkney Isles
Project: Rousay to Westray Cable Replacement
Customer: Scottish & Southern Electricity Networks
Vessel: Global Symphony
ROV: Q1400
Location: Orkney Isles
Activity: Power cable replacement
Year: 2018
Duration: 29 days
Global Offshore entered into a six year framework agreement in 2017 with Scottish and Southern Electricity Networks (SSEN).
SSEN are responsible for 111 submarine cables which supply electricity to 59 Scottish Islands, totalling 454km in length. It has been identified that 91km of cable will need replacing before the end of the contract period.
Global Offshore was awarded first contract under the framework agreement ahead of industry competitor VBMS. The requirement required the installation and commission of a new electricity cable between Rousay and Westray in the Orkney Isles. The new 10.5km cable was installed as part of SSEN’s ongoing electricity distribution subsea cable replacement programme and replaced the existing 35-year-old cable which was coming to the end of its operational life.
SCOPE OF WORK:
> Route engineering > Pre-lay & post lay surveys > Pre-lay mattressing for 1 crossing > Surface lay cable installation > Post lay burial (2 km) > Post lay rock bag placement > Shore ends pull in > Cable testing
Project: Merkur Inter Array Cable Installation & Burial
Vessel: Global Symphony
ROV: Q1400
Location: North Sea
Activity: Array cable installation & burial – a turnkey solution
Year: 2018
The cable installation and trenching team on board the Global Symphony were contracted to complete the lay and burial of 36 inter array cables on the Merkur Offshore Wind Farm being constructed 45km from the island of Borkum in the German North Sea.
During her maiden charter for the Group, the Global Symphony was mobilised with the Q1400 trenching ROV, configured in jet trenching mode for this project.
The team buried the 36 cables to minimum depths of one metre, providing stability and long term cable security.
The project guarantees customer Tideway, protection of the cables for the lifetime of the wind farm, mitigating against costly future threats to downtime and production.
The arrival of the Global Symphony on site allowed the Group’s two project delivery teams the opportunity to work seamlessly together to deliver both the cable installations as well as cable pull-in services for all 66 offshore wind turbines and one offshore substation.
The project demonstrates the Group’s breadth of complementary services and skills.
The company has installed 857 inter array cables and conducted 891 cable pull-ins since the inception of the offshore wind industry.
Project: Kincardine Export Cable Installation
Client: Grupo Cobra
Vessel: Global Symphony
ROV: Q1400
Location: Northern North Sea
Activity: 18km export cable installation
Year: 2018
The installation of the first offshore floating windfarm in Scotland required significant pre and onsite engineering expertise brought to the project by our dedicated in-house resource
The installation of the 18km export cable was completed by the team on board the highly versatile Global Symphony and marks the completion and connection of the first turbine on the 50MW Kincardine site.
The overall project involved pre-installation surveys, grapnel work, installation, including the use of a dynamic riser to allow for movement of the platform, and trenching of the 18km export cable from Cove to the floating turbine, located just off the coast of Aberdeen.
Our responsive, in-house engineering expertise and project management, allowed us to quickly react, meeting the customer’s project timelines to complete the project in just a few weeks. This marks the sixth successful project completed by the Global Symphony in 2018, all of which have received significant client feedback and satisfaction.
Future developments at the Kincardine site include the installation of six additional turbines over two campaigns in 2019 and 2020. Floating technology allows for sites in deeper water, opening up the market opportunities in Europe even further.
