Semi-submersible
MARIN Photo No. 02_2502
General information
Semi-submersibles generally show far less motions in waves than mono-hull vessels, making them especially suitable for tasks with very strict motion requirements. Semi-submersibles are used as crane vessels, drilling vessels, production platforms and accomodation facilities. A major advantage for these tasks is the large deck space, available as working space and for storage of equipment or supplies. With the ever requirements for working water depths the more recently built semi-submersibles are often equiped with a DP system.

Services & Activities
The Offshore Department is specialised in semi-submersible model tests and numerical simulations in the field of motions, mooring loads, wave drift forces and Dynamic Positioning (DP). The impact of green water and slamming on semi-submersibles is part of the expertise of the Offshore Department as well. Finally the towing of semi-submersibles and the assessment of possible Vortex Induced Motions (VIM) is also within our experience.

The Seakeeping Department has a lot of experience in the measurement of semi-submersible motions, often in extreme wave conditions. Their expertise also includes wave (impact) loads on semi-submersible pontoons during transport on the deck of a barge or heavy load vessel.

The Trials & Monitoring Department can be involved in full-scale measurements on semi-submersibles. Motions and loads can be measured and analysed, as well as the environmental conditions acting on the semi.

Facilities & Tools
Semi-submersibles are tested in the following MARIN facilities:


The behaviour of semi-submersibles is simulated with the following tools : (DIFFRAC, DRIFTP, DYNFORC and SEMISUB for MARIN internal use only)

Software Sales
Some software tools are available for commercial use outside MARIN. A complete overview of these software tools for sale can be found under Software Sales.

Experience record
The list below gives a review of semi-submersible model tests carried out at MARIN:

  • Blind Faith semi-submersible (AkerKvaerner / Chevron , 2005)
  • Atlantis semi-submersible (GVA / BP, 2002)
  • Caspian Sea semi-submersible (Keppel-FELS, 2001)
  • Millenium ExD semi submersible (Friede & Goldman / Sante Fe Corporation, 2001)
  • Petrobras P-XIII DP model tests (Petrobras, 1999)
  • Ocean Confidence DP model tests (Diamond Offshore, 1998)
  • JBF6000 and Amethyst-series model tests (Huisman-Itrec, 1998)
  • Stena Tay DP model tests (Keppel-FELS / Stena Drilling, 1997)
Most recent papers on semi-submersibles presented by MARIN
(complete overview of papers can be found under Publications)

MARIN spearheads advanced wave impact modelling initiatives
Janou Hennig, Joop Helder & Hannes Bogaert, MARIN Report, 2014

Tests for one of the largest floating platforms in the world
Frederick Jaouen & Willemijn Pauw, MARIN Report, 2013

Complex model tests on MOHO NORD Tension Leg Platform
Arjen Koop & Jule Scharnke, MARIN Report, 2013

OBELICS JIP successfully achieves goals
Ron Schoon & Eelco Frickel, MARIN Report, 2013

Viscous-Flow Calculations for Model and Full-Scale Current Loads on Typical Offshore Structures
Koop, A., Klaij, C., Vaz, G., MARINE 2011, IV International Conference on Computational Methods in Marine Engineering (Selected Papers), Computational Methods in Applied Sciences, 2013

Most recent FPSO articles written for MARIN Report
(complete overview of artcles can be found under Publications)

MARIN spearheads advanced wave impact modelling initiatives
Janou Hennig, Joop Helder & Hannes Bogaert, MARIN Report, 2014

Tests for one of the largest floating platforms in the world
Frederick Jaouen & Willemijn Pauw, MARIN Report, 2013

Complex model tests on MOHO NORD Tension Leg Platform
Arjen Koop & Jule Scharnke, MARIN Report, 2013

OBELICS JIP successfully achieves goals
Ron Schoon & Eelco Frickel, MARIN Report, 2013

Viscous-Flow Calculations for Model and Full-Scale Current Loads on Typical Offshore Structures
Koop, A., Klaij, C., Vaz, G., MARINE 2011, IV International Conference on Computational Methods in Marine Engineering (Selected Papers), Computational Methods in Applied Sciences, 2013

Contact
For more information on how MARIN can help your organisation with FPSOs, please contact:

For model test and simulation activities: Offshore Department
For full scale measurements: Trials and Monitoring Department
For model test and simulation activities: Ships Seakeeping Department



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