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Established in 2015, our Engineering Business Unit is at the forefront of providing specialized services for the Marine Energy Sector, with a strong emphasis on Submarine Cables. Leveraging collaborative expertise inherited from our subsidiary, Kraken, we are committed to driving innovation and excellence in engineering solutions.

Why choose us?

We adapt quickly to evolving project requirements and client needs.

Our agile structure allows us to tailor solutions, scale resources efficiently, and respond effectively to changing technical and operational constraints.

We are fully dedicated to the Marine Energy sector, with recognized expertise in submarine cables, offshore structures, and complex installation engineering. Our teams understand the technical, environmental, and operational challenges specific to offshore and subsea projects,  because we work in them every day.

From site characterization and geotechnics to cable design, offshore installation, and vessel engineering, we deliver integrated engineering solutions across the entire project lifecycle.

Our multidisciplinary specialists combine:

  • Geoscience & geohazard expertise
  • Metocean and coastal engineering
  • Foundations & offshore structural design
  • Cable & flexible system engineering
  • Transportation & installation analysis
  • Offshore methods engineering

We don’t just solve isolated problems — we optimize the whole system.

Offshore projects move fast, and so do we, as time is critical.

We quickly assemble dedicated task forces tailored to your specific challenge. Whether supporting a tender phase, resolving a critical installation issue, or reinforcing a project team, we mobilize the right expertise at the right time.

Our flexible structure allows us to:

  • Adapt to changing scopes
  • Scale resources efficiently
  • Deliver under tight schedules

Aventa combines engineering excellence with strategic consulting capabilities.

Thanks to strong collaboration with our Consulting Business Unit, we:

  • Identify the optimal technical and commercial strategy
  • Secure early-phase project decisions
  • Align engineering with project risk and performance objectives

This synergy ensures coherent, efficient, and value-driven project execution.

Site Characterization

Geoscience & Geohazard

  • Geophysical interpretation and geological mapping
  • Geotechnical soil characterisation
  • Geotechnical earthquake engineering
  • Slope stability analysis
  • Seabed morphodynamics study
  • Survey technical specifications & Operations assistance

Metocean & Coastal engineering

  • Desktop/Feasibility metocean studies
  • Definition of metocean conditions for specific sites and/or sea transports (database or hindcast/modelling data)
  • Nearshore metocean criteria
  • Advanced statistical analyses
  • Weather downtime assessment
  • Wave/Hydrodynamics modelling
  • Wave diffraction/agitation studies inside port/harbour
  • Operations downtime
  • Tropical cyclones modelling

Foundations & Offshore structures engineering

  • Shallow and deep foundations design
  • Pile drivability
  • Geotechnical anchor design
  • Pipeline and cable route optimization
  • Soil-pipe interaction

Cables & Flexibles design

  • Concept / Feasibility / Pre-FEED
  • Risk analysis
  • CAPEX & OPEX estimate
  • Owner engineering
  • Support to tender
  • 3rd party technical review
  • Root cause analysis
  • R&D and technology screening
  • Route definition and optimisation
  • Cable burial risk assessment (CBRA)
  • Burial assessment study (BAS)
  • Cable/flexible soil interaction
  • Cable protection design (Rock berm, concrete mattresses, rock bags, etc.)
  • Cable crossing design
  • On-bottom stability,
  • On-bottom roughness, free-span assessment
  • Cross section design
  • Ampacity calculation
  • Electrical layout/ architecture optimization
  • OSS Preliminary design suitability review
  • LCOE optimization
  • OSS preliminary layout
  • All type of cross sections
  • Non-linear behaviour of material
  • Stress behaviour of each component
  • Load sharing
  • Capacity curve
  • Crush loads
  • Lazy waves, tethered wave, lazy S…
  • Configuration design (lazy waves, tethered wave, lazy S …)
  • Accessories specifications (buoyancy modules, bend stiffener, …)
  • Optimization
  • All type of floaters (Floating wind turbine, O&G floaters, …)
  • Unbounded / bounded hoses
  • CPS design verification
  • General arrangement verification
  • Stabilization design and optimization (rock berm, mattresses, rock bags, …)
  • Flow amplification

Transport & Installation (T&I)

Sea Transport

  • Route definition
  • Weather criteria definition
  • Motion analysis
  • Grillage & Seafastening design
  • Preparation of towage procedures
  • Bollard pull & Resistance calculations

Installation Analysis

  • Cable and flexible installation analyses (free-lay, pull-in, shore pull, etc.)
  • Lifting & Deployment analysis
  • Load-in / Load-out
  • Weather downtime assessment
  • Offshore structures (jackets and topsides): floatover, lifting, launching

Installation methods

  • Installation methods design
  • Detailed procedures, tasks plan
  • Storyboards and drawings preparation

Ships & Floating Structures

  • Loading cases: weight distribution and inertia
  • Hydrodynamic database generation (RAO, QTF, etc.)
  • Motion analyses: operating, extreme or fatigue
  • Model tests specification, follow-up  and post-treatment
  • Concept and feasibility design (new built & conversion)
  • Vessel selection and deck layout
  • Vessel mobilization design
  • Global & Local structural analysis
  • Stability analysis (trim&stab, inclining experiment, etc.)
  • Mooring systems design and verification (quasi-dynamic or fully coupled time domain)
  • Mooring hook-up
  • Mooring installation method
  • Heading analysis for turret system

Pipelines Engineering

Sea Transport Pipelines installation analyses (shallow and deepwater)

  • Rigid and flexible pipeline systems
  • S-Lay, J-Lay, Reel lay installation analysis
  • Shore pull analysis, AWTI analysis, lifting and lowering analysis, J-tube pull in analysis, fatigue analysis, curve stability assessment
  • Advanced installation analysis (in-line structure deployment and installation, stalk-on riser installation, DAF analysis, lazy wave riser installation, weld repair analysis, weather stand-by assessment, spooling analysis)

Pipelines in-place design (shallow and deepwater)

  • Field layout development
  • Flexible and rigid single and pipe-in-pipe systems design
  • Load-in / Load-out
  • Rigid spools design
  • Pipe and spool bend FE capacity
  • Pipelines global buckling and walking analyses

Offshore methods engineering (shallow and deepwater)

  • Rigid pipeline installation methods (export lines and infield flowlines)
  • Offshore structures (jackets and topsides)
  • Subsea installations (subsea structures installation, flexible flowlines installation, umbilical and flying leads installation, spools and jumpers installation)
  • Project engineering management