Ultimate strength
Ship collision Ship collision
General information
Driven by market needs ships and offshore structures vary in form, size, speed and operational area. Consequently most of recent structures are one-offs without any experience record. Therefore, assurance of sufficient ultimate strength of these structures forms a challenge for designers and a concern for operators.

Services & Activities
MARIN can help designers and operators to improve the safety at sea and in harbours. Our Hydro-Structural Services (HSS) , part of the Trials & Monitoring department can advice on structural strength including collision and grounding. The Seakeeping department can assist using dedicated model test, whereas the Nautical Training Center (MSCN) can perform safety studies.

With respect to ultimate limit states we can:

  • Determine extreme hydro-dynamic loading which is needed in the design stage. This includes extreme sectional forces, motion induced accelerations and wave pressures
  • Estimate ultimate strength of structures and their components
  • Advice on safety factors
  • Control extreme loading during operation by monitoring systems
  • Provide decision support towards avoidance of extreme conditions
  • Carry out safety studies involving Ultimate Limit States (ULS), like collision or grounding of ships
Facilities & Tools
Our service is facilitated by:

Experience record
The list below gives a review of ultimate strength projects carried out at MARIN:

  • Monitoring of container vessel Victoriaborg
  • Extreme bending moments of FPSO Glas Dowr
  • Numerous safety studies for LNG and Oil terminals
Most recent papers on ultimate strength presented by MARIN
(complete overview of papers can be found under Publications)

Sensing and Understanding Fatigue Lifetime of New and Converted FPSOs
Mirek Kaminski (MARIN), Offshore Technology Conference (OTC), Houston, 2007

Full scale wave and whipping induced hull girder loads
Aalberts P.J. and Nieuwenhuijs M.W., Hydroelasticity in Marine Technology, Wuxi, China, 2006

FPSO Fatigue Assessment: Feedback From In-Service Inspections
Hoogeland, M.G., van der Nat, C.G.J.M. & Kaminski, M.L., Offshore Technology Conference (OTC), Houston, 2003

Bultema, S. van der Boom, H. & Krekel, M., Offshore Technology Conference (OTC), Houston, 2000

FPSO Integrity; Structural Monitoring of Glas Dowr
van den Boom, H., Krekel, M & Aalberts, A., Offshore Technology Conference (OTC), Houston, 2000

Most recent articles on ultimate strength written for MARIN Report
(complete overview of articles can be found under Publications)

For more information on how MARIN can help you with ultimate strength issues, please contact the Hydro-Structural Services (HSS) group of the Trials & Monitoring Department for full-scale tests and advice, the Seakeeping department for model test and the Nautical Training Center (MSCN) for safety studies.

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