gdg cable capabilities - gdgeo.com
Post on 07-Dec-2021
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GDG has extensive expertise in offshore cable engineering, which has been deployed on a wide range
of projects around the world. GDG’s team comprises offshore structural, mechanical, geotechnical and
civil engineers, naval architects and GIS specialists, who are experienced in all stages of Offshore cable
projects, starting from early stage route selection, survey support, cable design review, installation
studies, supervision of offshore installation works and O&M strategy assessments.
In the recent years, GDG has successfully delivered support on various cable projects, including landfall
assessments and HDD assessments, offshore route selection and practical engineering support during
installation. GDG apply these expertise to interconnector projects, export cables and Inter-Array
Cables (IAC) for offshore wind developments.
GDG provides the following cable related services:
• Route assessment and route engineering,
• Route survey management,
• Geotechnical risk management,
• Marine consents,
• Marine coordination and management,
• Landfall assessment,
• HDD design,
• Cable design review and studies on optimal cable design,
• Cable burial risk assessment,
• Trenching assessments and selection of suitable trenching tool and trenching subcontractors,
• Cable installation assessments,
• Weather downtime assessments,
• Cable employers’ requirements etc.
GDG Cable Capabilities
GDG were requested on behalf of the installation
contractor, ABCO Marine (ABCO), to develop a
design solution to accommodate the export cable
landing for the Fecamp offshore wind farm. A sheet
piling design to temporarily support the deep
excavations for the placement of cable ducts was
developed as the preferred solution for the site
specific conditions. The ducts are to be placed
beneath existing concrete jetty foundation, which
requires the temporary removal of concrete caisson
section, as well as limited and careful excavation of
underlying soil. A suite of temporary work sheet pile
designs were completed. Design Risk Assessments
were developed which identified the key
construction hazards and risks as well as hazard / risk
evaluation of the design decisions made. The specific
geometry of the cable transition through the inter-
tidal was made to account for the curvature of the
cable laydown route with provision made for critical
setting out points.
Fecamp Cable Installation
GDG was contracted to assess the feasibility of
Horizontal Directional Drilling (HDD). The scope of
work included review of the existing feasibility
studies for four sites in France and United Kingdom,
review of site investigation reports and producing a
summary assessment report of the site investigation
reports relevant for HDD feasibility assessment. GDG
evaluated ground conditions, soil parameters and
laboratory results to provide an assessment of site-
specific impacts and risks at the respective HDD
locations. A summary description of the soil layers,
characteristics, impacts and geological risk
assessment were provided for each HDD trajectory.
Using the relevant soil data extracted specifically for
each HDD trajectory, GDG performed a pullback
force calculation, hydrofracture analysis and
verification of the proposed HDPE pipe design. Once
all relevant design checks were undertaken, GDG
included the findings, risks and proposed mitigation
measures in a specific design and installation risk
assessment.
Gridlink Interconnector Project
GDG was commissioned by Polska Grupa
Energetyczna S.A. (PGE) in October 2018 to
undertake offshore consultancy services with
respect to the development of the Baltica 2 and
Baltica 3 offshore wind farms (OWF), including
extensive cable engineering support that was
initiated in December 2019.
GDG completed an export cable route study for
Baltica 2 and 3 in March 2019. The aim of the scope
was to confirm that the cable route corridors for
Baltica 2 and 3 are feasible to progress into the next
stage of the investigation. GDG took all aspects of
routing issues into consideration including
seabed/ground conditions, engineering constraints,
third party interactions, environmental and physical
constraints, and restricted/prohibited zones. As part
of this scope the GDG team considered the cable
burial risk. In addition, different types of cable
laying/burial technique were assessed.
GDG have also reviewed existing geophysical and
shallow geotechnical data collected across the
export cable areas, development of preliminary
ground models for the cable routes, interpretation of
site investigation data and integration with existing
geophysical data to inform a comprehensive ground
model. This role has included supporting the
developer make decisions with respect to the cable
engineering and installation strategy based on the
Cable Burial Risk.
Baltica 2 and 3
GDG was contracted by the developer of an Offshore
wind farm in the Irish sea to provide Owners
Engineer support for the Array and Export cables
Design, Installation works and Operations &
Maintenance works. GDGs role includes cable
installation engineering, consisting of route
engineering, cable burial and external protection,
installation options, critical review of proposed
methods as well as development of Employer’s
Requirements. Furthermore, design assurance
support is provided including a wide range of tasks
such as risk management, identification of
opportunities, input to the programme, cost
modelling, design reviews, engagement with Design
Authority etc.
Owners Engineer on confidential project in the Irish sea
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