Pelagian’s consultants have worked in the offshore survey sector for over 25 years.

Our consultants are dedicated surveyors, geophysicists and engineers with many years of offshore survey experience providing the vital interface between data acquisition and system design. Pelagian provides its customers with a full survey solution using well established strategic partnerships with a number of the world’s survey companies.

Geophysical Survey Expertise

Pelagian’s team includes dedicated surveyors, geophysicists and engineers with many years of offshore expertise in operating high resolution survey equipment including GPS navigation, multibeam echo sounders, sidescan sonar, shallow seismic profiling, acoustic positioning, sediment sampling, drilling and CPT measurement; all valuable tools for the assessment of the marine environment for a submarine cable.
Pelagian has worked closely with both cable owners and installers and offshore survey companies to advise on the specifications and requirements for geophysical surveys, to inform the design process on seabed hazards, potential UXO risk and environmental sensitivity. Pelagian provides its customers with a full survey solution, using well established strategic partnerships with a number of the world’s specialist survey companies.
Pelagian conducts its own survey programs and has well established annual contracts for depth of burial surveys in Europe. Our consultants advise the customer on any significant changes in depth of cover over their cable assets and then work closely with our installation experts devise mitigation strategies to ensure that seabed cable is adequately protected from external hazards.

Subsea Cable Planning

Pelagian is an experienced user of the industry standard MakaiPlan cable engineering software and has been using the software for over 10 years. We have supported Makai Ocean Engineering in the continuing development of the software, helping to improve the interface and cater for the needs of new business areas.
MakaiPlan is Pelagian’s primary tool for the detailed design of submarine cables using a Geographical Information System (GIS) map based interface. This interface is used to access thematic databases such as geophysical survey data and existing seabed features allowing the route engineer to precisely model the cable route and modify its interaction with both natural and manmade seabed hazards.
The cable routes may change a number of times during the project lifecycle, each change reflecting the incorporation of new data to enhance the design process. The output of this map based engineering process is then used to quantify a variety of business decisions from initial design studies, through procurement and cable manufacturing to hazard surveys and cable installation.

Geospatial Data Management

Pelagian offers comprehensive expertise in the management of geospatial data for subsea cable projects. Our expertise lays in the active management the diverse datasets coming from various parts of the project workflow. This includes the initial infrastructure designs, geophysical surveys and construction data.
A challenge of large multiyear projects is to ensure that the data being used is up to date, relevant and can be easily shared amongst the various companies involved in the design and construction process. Using ARCGIS and CAD based software, Pelagian’s consultants consider the project as a series of discreet datasets and apply rigorous quality controls to each dataset.
This data can then be presented in a variety of electronic formats, from desk top based map viewers to detailed engineering drawings and working charts, tailored to the end user and quality controlled to ensure that the information is valid for its intended purpose.

Case Study: International Cable System Permitting Consultancy Services

Pelagian were contracted to provide permitting and regulatory services to a major International Cable System project, working on behalf of the cable installer and system owners.
The work scope consisted of data gathering for countries in Europe, the Mediterranean and the Far East segments of the cable system.
Challenges included the negotiations with French authorities on landing point selection and the crossing of areas of Posidonia Seagrass and sensitive negotiations in Thailand where the cable is planned to pass through a protected area. These negotiations informed both government and the cable owners of the specific requirements to minimise environmental impact to achieve a successful cable route.

Case Study: Main One Permitting Consultancy Services

Pelagian were contracted to provide permitting and regulatory services to the Main One Cable System project, working on behalf of the cable installer and system owners.
The work scope consisted of detailed in-country data gathering at a diplomatic level in all but one of the North and West African countries from Morocco to Nigeria and development of the data into a sophisticated permit management system which was used to track the requirements, progress and costs associated with each country.
The permit work encompassed detailed knowledge of government and regulatory requirements for cable landing points, work in Territorial seas, traverse of EEZ waters, crossing of oil/gas concessions and negotiation of agreements for both survey and cable installation. The work was successfully completed without delay or penalty, considered a first in the history of a West African cable project.

Case Study: Annual Depth of Burial Survey

Pelagian has been providing annual depth of burial surveys on a subsea telecom cable in Europe for the last 10 years. This cable is located in an environmentally sensitive shallow water area, where numerous cables from both telecoms and offshore renewables / power make landfall in Northern Europe.
The seabed in the area is prone to sediment mobility, potentially exposing the buried cable to external risks such as fishing and anchoring. The area has also recently seen a number of new projects with increased construction shipping activity, serving the offshore wind farms.
The survey is undertaken using high resolution multibeam bathymetry, sidescan sonar and subsea cable tracking equipment mounted on a sled. This is used to determine the depth of cover of sediment and enable direct comparisons with the previous years’ survey, to monitor the burial status of the cable.

 

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