Our experts can perform any kind of stability analisys needed for Offshore units such as semi submersibles, jack-up rigs, drillships and floating production/storage vessels. In addition, training can be given in general stability for rigs as well as how to perform efficient offshore stability calculations using the NAPA software.

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  • 3rd party verification

  • Documentation for approval according to all known rulesets (e.g. IMO, DNV, ABS, NMD, etc.)

  • Wind moment calculations

  • Emergency studies

  • Training in offshore stability and practical examples using NAPA software

  • Updating existing stability documentation

  • Any other special purpose geometry and stability analysis


Our experts are able to perform high quality analysis in efficient ways and with reliable results in accordance with the necessary rules. We know about almost any regulations and have tools to assess vessels against any of these. The experience we have gained from all the different projects help us produce documentation requiring fewer iterations with approval bodies. Problem areas can be identified fast and we are able to give good advice on how to satisfy rules in case the stability criteria are not met initially.


Depending on the work description, the delivery from our projects features either full stability documentation with hydrostatics, wind moments, tank capacities, MaxKG curves for both intact and damage stability, ballasting curves, shorelines, etc. In case of 3rd party verifications, we agree before starting the work on how detailed the final report should be. Our delivered stability documentation is good enough for class or authority approval. It is, however, the client’s responsibility to submit the documentation to the applicable approval body.


After receiving the necessary drawings or other required documentation, we proceed with producing (our updating) a 3D model of the stability elements in the NAPA software. If wind heeling moments are not available from our client, we also build a 3D wind model in the NAPA software for wind heeling moment calculation according to the IMO standard. Further, analysis will be run and documentation made.

Our Experience

We have experts with many years of experience with stability analysis for all kinds of offshore units according most known regulations. Especially the knowledge of all the regulations gain our clients reliable information and assessments.

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Related contact information

Stability Advisory Services