Airgap and safety: Metocean induced uncertainties affecting airgap assessments. (January 2019)

• Record Type: Journal Article
• Authors: Haver, Sverre
• Is Part Of: Marine structures. Volume 63(2018)
• Page Start: 406
• Page End: 428
• Publication Date: 2019-01
• Subjects: Airgap -- Second order wave theory -- Wave spectrum -- Uncertainties; Naval architecture -- Periodicals; Offshore structures -- Periodicals; Architecture navale -- Périodiques; Structures offshore -- Périodiques; Naval architecture; Offshore structures; Periodicals; 620.4162
• DOI: 10.1016/j.marstruc.2017.09.006
• Languages: English
• ISSNs: 0951-8339

Abstract

Abstract: The safety aspect of the airgap question is discussed. Thereafter uncertainties related to airgap assessments will be discussed both for fixed platforms and semi-submersibles. The various sources are discussed and illustrated with examples. Results are discussed both for 10 −2 – annual probability scenario (ULS) and an ALS scenario (10 −4 annual probability). This because the most important difference between the two possible rule regimes for Norwegian Continental Shelf is the way ALS is introduced regarding airgap. Highlights: Discussion of rule regimes applied at the Norwegian Continental Shelf. Sources of uncertainties regarding determining airgap for fixed platforms. Uncertainties in predicting proper airgaps for semi-submersibles. Discussion of assumptions that must be made for a proper airgap assessment.