phase 4 report - DNV

RN02: DESIGN OF FLOATING STRUCTURES IN ICE // PART 2 GAP Analysis based on ISO/FDIS 19906Applicable ISO 19906 provisions Analysis and applicability for floaters RecommendationsA.17 Ice managementA.17.1 GeneralFloating structures that are deployed in ice-covered waters are oftensupported by highly capable ice management vessels, with the intendedrole of modifying the local ice environment, reducing ice actions onthe structure and enhancing ice clearance around it. The requirementto identify potentially adverse ice features or situations requiring icemanagement and then to deal with them in a timely manner increasesthe range of environmental considerations that are normally associatedwith fixed structures. […]Adverse effect should be identified. All section shall be reviewed and clear performancerequirements to IM shall be outlined. Then, manysections above shall be revisited with objective todetermine EL and AL ice loads.A.17.2.2 Ice management to reduce ice actionsThe use of ice management to reduce the frequency and severity of iceactions on offshore systems is obvious in concept. […][…]. However, experience also shows that not every adverse ice situationcan be managed with 100 % reliability in a timely manner, even withhighly capable ice management systems.Reduction of design ice actions resulting from design icefeatures (i.e EL or AL level) is not obvious. No guidance onmethodology is offered.As above! Additional guidance on use of IM in designto be provided.38RUSSIAN–NORWEGIAN COOPERATION PROJECT