Pipelines & subsea

As offshore operators are moving onto deeper waters to access untapped hydrocarbon reserves, the length and depths at which subsea pipelines are laid, exceed anything that has been achieved before. Specialised engineering skills are required to keep up with this development.

Pipelines and subsea

Contact

Jesper Thomsen

M.Sc., chemical eng., Director, Business Development, North Sea

T: +45 5161 2375

Kristoffer Bergholt

Head of Department, Offshore Pipelines

Wide-ranging service portfolio within subsea pipelines

Ramboll has more than three decades of experience with offshore infrastructure. We cover transmission pipelines as well as infield flowline systems from concept to design. For maturing pipelines, we handle all aspects of brownfield-engineering related to the reassessment of structural integrit.

We design complex High Pressure/High Temperature (HP/HT) flow lines, and we are specialised in subsea tie-back projects with topographical challenges combined with HP/HT operation.

Our services within subsea and pipelines cover:

Financial studies, impact assessment (EIA/ESIA), regulatory compliance
Pipeline design from conceptual studies and FEED to detailed engineering
Project management
Route selection & surveying, laying & trenching analyses and installation studies
Subsea components & installations, and riser systems
Offshore supervision & engineering support, and construction management
Fitness for purpose evaluations, reassessments, lifetime extensions
Risk & safety assessments and HAZID/HAZOP analyses

Subsea design competencies

Our proven pipeline engineering competencies are based on an advanced understanding of critical issues such as structural behaviour and hydrodynamics under adverse conditions. We offer offshore expertise in route selection, geophysical and geotechnical route surveying, system optimisation, laying and trenching analyses, riser systems, flow assurance, subsea components and installation

Ramboll provides a full set of subsea operation services in connection with subsea pipeline design. Our subsea engineering includes know-how regarding:

Templates
Subsea safety isolation valves (SSIVs)
Protection structures
Y and T assemblies

Pipeline reassessments for maturing fields

Ramboll supports clients in increasing efficiency and prolonging production on mature fields. Our in-depth knowledge extends to offshore platforms and FPSOs, which gives us the required overview and experience to handle tie-back or tie-in projects for all relevant interfaces between pipeline, subsea completion and platform or FPSO.

Connecting to onshore infrastructure

Based on our multidiscipline profile, Ramboll can also assist in connecting subsea highways with onshore infrastructure by engaging our civil engineering expertise such as ports & marine, roads, construction and contract management.

Learn more

Designing subsea pipelines

Designing subsea pipelines brochure

Projects

The world largest pipelay vessel will install the record breaking 36" Polarled pipeline

Polarled: Record-breaking subsea pipeline crosses the Arctic Circle

The Polarled pipeline project is part of the plans for developing fields further north in the Norwegian Sea.

Balticconnector pipeline FEED study

Ramboll was awarded a FEED study for Balticconnector - an offshore 20” gas transportation pipeline of approximately 81 km (50 miles) in the Gulf of Finland aiming at interconnecting the Finnish and Estonian natural gas distribution networks.

Kirinskoye, Sakhalin – Installation engineering in the Arctic region

Kirinskoye is the first offshore field in Russia to utilise a subsea system for natural gas production. The field holds over 100 billion cubic metres of gas and 11.4 million tonnes of gas condensate.

The Kirinskoye gas and condensate field is part of the 'Kirinsky block' in the Sea of Okhotsk and is one of the main development priorities for Gazprom, the world's largest gas producer.The field is part of a Russian Federation strategy for development of an integrated gas production, transportation and supply system to the regions of Eastern Siberia and the Far East.

The Nord Stream pipeline project

European gas consumption is increasing, and in order to meet these demands and ensure a long-term reliable supply line of energy, it was decided to establish a 1,224 kilometre dual pipeline system running from Vyborg, Russia to Lubmin near Greifswald, Germany. The project is called the Nord Stream Pipeline.

FEED and detailed design for Gudrun pipeline system

As part of the Sleipner SPORT development project, satellite platform Gudrun was tied-in to Sleipner, for oil and gas processing and export. Statoil awarded Ramboll the FEED and detailed engineering of the subsea pipeline system.

FEED and detailed design for Gina Krog subsea pipelines

As part of the development of the Sleipner area, Statoil planned to utilise existing process and export facilities for production from satellite platforms. Statoil selected Ramboll to perform FEED and detailed engineering of subsea pipelines to the satellite field, Gina Krog.

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