ISO INTERNATIONAL STANDARD 19906 Second edition 2019-07 Petroleum and natural gas industries Arctic offshore structures Industries du pétrole et du gaz naturel - Structures arctiques en mer Reference number IS0 19906:2019(E) @ IS0 2019 IS0 19906:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +4122 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0 2019 - All rights reserved IS0 19906:2019(E) Contents Page Foreword. Introduction... xi 1 Scope .... 7 2 Normative references ...... 3 Terms and definitions... .2 4 Symbols and abbreviated terms.... .10 4.1 Symbols..... 10 4.2 Abbreviated terms... 10 5 5.1 Fundamental requirements.. ..12 12 5.3 Site-specific considerations .. 13 5.4 Construction, transportation and installation ... 15 16 5.6 Environmental protection.. 16 5.7 Serviceability requirements including vibration... . Decommissioning and reclamation.... 17 6 Physical environmental conditions .... 17 17 6.1.1 Physical environment requirements 17 6.1.2 Physical environmental data monitoring programmes. 18 18 6.3 Meteorology .... 18 6.3.1 Air temperature.. 18 6.3.2 19 6.3.3 Wind chill 19 6.3.4 Snow.. 1g 6.3.5 Ice accretion... 19 6.3.6 Visibility..... 20 6.3.7 Polar lows... 20 6.4 Oceanography... 6.4.1 Water depth . 20 6.4.2 Waves.. 20 6.4.3 Ocean currents. 20 6.4.4 21 6.5 Sea ice and icebergs 21 6.5.1 General 21 6.5.2 Icetypes 22 6.5.3 Ice morphology... 22 6.5.4 Ice movement. 22 6.5.5 .23 6.5.6 ice monitoring. 23 6.6 Seabed considerations. 6.6.1 Earthquakes.... 6.6.2 Permafrost. 23 6.6.3 Ice gouge.. 6.6.4 7 Reliability and limit states design ... 24 24 7.1.1 Governing principles.. 24 7.1.2 Life-safety categories.. ..24 @ IS0 2019 - All rights reserved ili IS0 19906:2019(E) 7.1.3 Consequence categories.. .24 7.1.4 Exposure levels... .25 7.1.5 Safety and reliability... .25 7.1.6 Limit states... 25 7.1.7 Alternative design methods .. 25 7.2 Limit states design method.. 26 7.2.1 Limit states... 26 7.2.2 Actions.... 7.2.3 7.2.4 Combinations of actions and partial action factors. 31 8 Events and actions.. .33 8.1 General.. 33 8.2 Ice events and actions .33 8.2.1 General principles for calculating ice actions ..... 8.2.2 Representative values of ice actions. 8.2.3 Ice events and design situations... .34 8.2.4 .Global ice actions... 8.2.5 Local ice actions... 37 8.2.6 Dynamic ice actions .. .37 8.2.7 Operational measures to reduce ice actions.... .38 8.2.8 Physical and mechanical properties of ice .. 38 8.3 Metocean related actions... .39 8.3.1 8.3.2 Wave-induced velocity of ice features .... 41 8.4 Seismicactions. .41 8.4.1 General.... 8.4.2 Companion seismic actions ... 42 8.4.3 Companion ice actions... .42 8.4.4 Factors influencing seismic actions and effects .. 8.4.5 Seismic isolation and damping systems... .42 9 Foundation design ... ..42 9.1 General. 42 9.2 Geotechnical data acquisition and identification of hazards .43 9.2.1 General.... 9.2.2 Marine soil investigations.. 44 9.2.3 Bathymetry survey... .44 9.2.4 Geophysical survey ... .3 Representative values of soil properties.... .44 9.4 Design considerations.. 9.4.1 General.. .45 9.4.2 Actionfactors 46 9.4.3 Material and resistance factors... .46 9.4.4 Dynamic action effect analysis ... .46 9.4.5 Ultimate limit states... 46 9.4.6 Serviceability iimit states.. .47 9.4.7 Fatigue limit states.. .47 9.4.8 Abnormal limit states. 47 9.4.9 Construction and installation .. 9.5 Gravity-based structures... .48 9.5.