DNVGL.com

SquallMoor – phase 2

Contact us:

Siril Okkenhaug Siril Okkenhaug
Principal Engineer

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Challenge

Squall phenomena have concerned metocean specialists for the last 15 years. Existing design guidelines for squalls are insufficiently detailed, and different parties in the mooring industry have for a long time tried to initiate studies to close this gap. 

In phase 1 of the SquallMoor joint industry project (JIP) we have managed to gather important stakeholders to cooperate and contribute. More work is needed before general conclusions for design in squall conditions can be made. It is important to continue this work now to benefit from the experience gained in the project, and while work processes, analysis models, postprocessing of results etc. are available and can be easily and efficiently reused. 

Solution

  • We aim to extend the number of mooring systems analysed by including a broader portfolio of cases that are meant to be covered by the design guideline                                                                                         
  • We aim to give recommendations on the minimum amount of squall data required for the mooring design analyses
  • Additional studies will gain additional experience, support the specification of the preferred design recipe and provide the data required to conduct a formal code calibration.

Benefits

The SquallMoor JIP aims to provide a design approach that is internationally agreed.  The JIP results will be used in forthcoming updates of DNV GL and BV recommended practices and standards ensuring consensus and predictability for the industry.

Value

Forthcoming update of design requirements for squall aim for trade-off between cost and reliability:

  • Avoiding unnecessarily conservative designs lead to cost savings for mooring systems
  • Reduced probability for mooring failure lead to reduced production down-time and repair cost.