references

GENERAL

Project 

Location 

Type 

SoW

Year 

TRUSSFLOAT 

Floating offshore wind projects 

Semi-submersible floating tripod

Detail engineering

2016 – 2019

KEY POINTS

  • Supported by ADEME
  • Validated with patents, tank tests and aero/hydro-coupled simulations
  • Remarkable hydrostatic and hydrodynamic behavior
  • Low risks and minimum Levelized Cost of Energy

TECHNICAL

Power 

Wind turbine 

 

Availability

Installation philosophy

Site conditions

6 MW with upscaling options up to 15 MW

Adapted to GE, SENVIRON, SIEMENS, MHI-Vestas, 2B-ENERGY etc…

100% for typical Mediterrarean conditions

Floating support and wind turbine generator installed onshore then towed to the site

“Standard” version for Mediterranean conditions   “tough” version for Oceanic conditions 

 

TrussFloatTM – a fully flexible floating platform for various floating wind power applications

In shallow waters, offshore wind farms are based on fixed bottom foundations. As for water depths above 50 meters fixed bottom foundations are not an economical solution, Dolfines has developed a floating foundation called TrussFloatTM within the EolFloatTM project supported by ADEME® and Investissements d’Avenir.

In July 2019, ADEME® has approved without reserve the final stage of the EolFloatTM project, thereby strengthening the position of Dolfines in the floating wind market. The EolFloatTM consortium has been led by DIETSWELL, the mother company of Dolfines, responsible for engineering and project management, supported by construction company MATIERE as well as OCEANIDE which runs basin test facilities.

TrussFloatTM is a semi-submersible platform for various floating wind power applications. It can accommodate two- and three-bladed, up- and down-wind turbines with a power capacity of 6 MW and more. TrussFloatTM perfectly fits the market requirements thanks to its superior stability at light weight leading to low Levelized Cost of Energy (LCOE).

TrussFloatTM offers great flexibility for a large spectrum of applications thanks to its high deck capacity, ranging from electricity or H2 production to direct water injection. As an option, a unique fully integrated turbine-floater-design with 2BEnergy is available., particularly suited for hurricane areas. Dolfines is now working on tenders for commercial wind farms and O&G applications with its technology.

EolFloat – Laureate of French Prime Minister’s « Future Investments Program » and ADEME®

demonstrator project

📍Océanide Site

SEA WATER AIR CONDITIONING (SWAC)

GENERAL

Client 

Location 

Type

SoW

Year

Several 

French Polynésie

SWAC 

Mechanical calculations, operations engineering and scheduling : retrieval and immersion

2016 – 2017

KEY POINTS

  • Pumping cold temperature water through flexible pipes
  • Exchange system to cool down air conditioning
  • Secluded areas with limited resources and on-site support

TECHNICAL

Typical Water Depth

Typical Water Temperature

Typical Pipe Diameter

800 – 1000m 

3 – 5°C

300 – 1,600mm

GENERAL

Type 

SoW 

Year 

Location 

Horizontal Directional Drilling 

Engineering 

2011 / 2013

The Netherlands

KEY POINTS

  • Design and engineering for several R&D projects for seismic surveys, both onshore and offshore
  • Horizontal Directional Drilling (HDD)
  • Adaptation to cable landfall

TECHNICAL

Diameter

Length

Power

6″-1/2 

1,300m

200 to 500 KW drilling units 

GENERAL

Location 

Type

SoW

Year

North Sea 

Jacket 

Design review 

2013

KEY POINTS

  • Review of jacket and topside design
  • Structure, Calculation note, Installation procedure
  • Advice based on technical and economical analysis

TECHNICAL

Power 

Jacket type 

Installation type 

900MW topside

Single and split 

Topside installed by float-over

GENERAL

Type 

SoW

Year

Jacket and Gravity Based Structure (GBS)

Concept studies, EPCI schedule and cost estimate

2019

KEY POINTS

  • Conceptual design of jacket and GBS substructures
  • Estimation of an EPCI contract in terms of schedule, cost estimate, risks analysis, and associated deviations
  • Lifting of topside included in the scope of work

TECHNICAL

Power 

Bathymetry 

Wave conditions 

Supply chain 

Installation 

900 MW HVDC substation 

30m

Hs 100yr = 10 m | Hmax 100yr = 18,9 m

Asia and Europe (several options studied) 

Several lifting configurations 

GENERAL

Location

Type 

SoW

Year 

North Sea 

Floating units 

Concept definition, feasibility study 

2018 – 2019

KEY POINTS

  • Power remote Oil & Gas sites
  • At least 50 % from renewables
  • Off-grid units: continuous supply, autonomous
  • Combination of different renewable energy sources

TECHNICAL

Water depth 

Conditions 

Power 

> 50 m 

All sea states

Up to 10 MW