ISO INTERNATIONAL STANDARD 19905-3 Second edition 2021-03 Petroleum and natural gas industries Site-specific assessment of mobile offshore units - Part 3: Floating units Industriesdupétroleetdugaznaturel-Evaluationspecifiqueau sited'unitesmobilesenmer Partie3:Unites flottantes Referencenumber ISO 19905-3:2021(E) SO @IS02021 IS019905-3:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may 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 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email:[email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved IS019905-3:2021(E) Contents Page Foreword Introduction .. i 1 Scope. ..1 2 Normativereferences ..1 3 Terms and definitions .2 4 Abbreviatedterms 5 Overall considerations .5 5 5.1 General 5 5.1.1 Competency 5.1.2 Planning. .5 5.1.3 Reporting. .5 5.1.4 Regulations .5 .5 5.1.5 Classification of unit 5.2 Assessment 6 5.3 .6 Exposure levels. 5.4 Selection of limit states. 5.5 Determinationofassessmentsituations 5.5.1 1 General. 5.5.2 Arcticoperationsandice 5.5.3 Earthquake. .8 5.6 Models and analytical tools 8 6 Datatobe assembled foreach site .8 6.1 Applicability 6.2 Mobile floating unit data .8 6.3 Stationkeepingdata .9 6.3.1 General. 9 6.3.2 Moored units 6.3.3 Moored units with thruster assist. .9 6.3.4 Dynamicallypositionedunits 6.4 Sitedata. 10 6.5 Dataonactivity/uselimitations .10 6.5.1 General. .10 6.5.2 Reassessmentormodificationofactivity/uselimitations .11 6.5.3 Sourcesofdataandtypesofactivity/uselimitations. .11 6.6 Post installation data 11 7 Actions. 11 8 Hull of unit .12 8.1 Strength .12 8.1.1 General. 12 8.1.2 Monohull .12 8.1.3 Semi-submersible 12 8.1.4 Otherhullforms .12 8.2 Air gapand freeboard 12 8.2.1 General 12 8.2.2 Monohull .13 8.2.3 Semi-submersible .13 8.2.4 Otherhullforms .13 8.3 Temperature. .13 8.4 Stability 14 Stationkeeping system 9 .14 9.1 General. 14 ili IS0 2021-All rights reserved