Abstract

Co-author: Pavel Liferov (Statoil)

Statoil is operator in field developments offshore East Coast of Canada and in the Norwegian Barents Sea in waters were sea ice intrudes seldom (CA) or extremely rarely (NO). Both developments have in common that FPS Os will operate in open water but still need to consider ice loads as part of design. Norwegian laws require that the knowledge base is included as part of the risk definition. The consequence of this for Arctic Norwegian projects is that uncertainties in design basis shall be compensated with more robust solutions in order to keep risk at the same level as in non-arctic locations. Assessments done for the Johan Castberg project are presented with focus on possible consequences from using immature ice load models. The need for including ice exposure in load assessments and to relate loads to exceedance probability levels is highlighted.