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Dnv-Rp-C205 Environmental Conditions and Environmental Loads

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Dnv-Rp-C205 Environmental Conditions and Environmental Loads RECOMMENDED PRACTICE DNV-RP-C205 ENVIRONMENTAL CONDITIONS AND ENVIRONMENTAL LOADS APRIL 2007 Since issued in print (April 2007), this booklet has been amended, latest in October 2008. See the reference to “Amendments and Corrections” on the next page. DET NORSKE VERITAS FOREWORD DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, prop- erty and the environment, at sea and onshore. DNV undertakes classification, certification, and other verification and consultancy services relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out research in relation to these functions. DNV Offshore Codes consist of a three level hierarchy of documents: — Offshore Service Specifications. Provide principles and procedures of DNV classification, certification, verification and con- sultancy services. — Offshore Standards. Provide technical provisions and acceptance criteria for general use by the offshore industry as well as the technical basis for DNV offshore services. — Recommended Practices. Provide proven technology and sound engineering practice as well as guidance for the higher level Offshore Service Specifications and Offshore Standards. DNV Offshore Codes are offered within the following areas: A) Qualification, Quality and Safety Methodology B) Materials Technology C) Structures D) Systems E) Special Facilities F) Pipelines and Risers G) Asset Operation H) Marine Operations J) Wind Turbines Amendments and Corrections This document is valid until superseded by a new revision. Minor amendments and corrections will be published in a separate document normally updated twice per year (April and October). For a complete listing of the changes, see the “Amendments and Corrections” document located at: http://webshop.dnv.com/global/, under category “Offshore Codes”. The electronic web-versions of the DNV Offshore Codes will be regularly updated to include these amendments and corrections. Comments may be sent by e-mail to [email protected] For subscription orders or information about subscription terms, please use [email protected] Comprehensive information about DNV services, research and publications can be found at http://www.dnv.com, or can be obtained from DNV, Veritas- veien 1, NO-1322 Høvik, Norway; Tel +47 67 57 99 00, Fax +47 67 57 99 11. © Det Norske Veritas. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, including pho- tocopying and recording, without the prior written consent of Det Norske Veritas. Computer Typesetting (FM+SGML) by Det Norske Veritas. Printed in Norway If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of Det Norske Veritas, then Det Norske Veritas shall pay compensation to such person for his proved direct loss or damage. However, the compensation shall not exceed an amount equal to ten times the fee charged for the service in question, provided that the maximum compen- sation shall never exceed USD 2 million. In this provision "Det Norske Veritas" shall mean the Foundation Det Norske Veritas as well as all its subsidiaries, directors, officers, employees, agents and any other acting on behalf of Det Norske Veritas. Recommended Practice DNV-RP-C205, April 2007 Introduction – Page 3 INTRODUCTION In addition, the following companies and authorities have attended project meetings as observers, providing useful com- • Background ments to this new RP. This Recommended Practice (RP) is based on the previous DNV Classification Notes 30.5 Environmental Conditions and — Aker Kværner, Norway Environmental Loads and has been developed within a Joint — Moss Maritime, Norway Industry Project (JIP), Phase I (2004-2005) and Phase II — Petroleum Safety Authority, Norway (2006). — Petroleum Geo-Services, Norway. • Acknowledgement DNV is grateful for the valuable cooperation and discussions The following companies have provided funding for this JIP: with these partners. Their individuals are hereby acknowl- edged for their contribution. — Statoil, Norway Marintek, Norway provided valuable input to the development — Norsk Hydro, Norway of Ch.10 Model Testing. Their contribution is highly appreci- —BP, UK (Phase I). ated. DET NORSKE VERITAS Recommended Practice DNV-RP-C205, April 2007 Page 4 – Introduction DET NORSKE VERITAS Recommended Practice DNV-RP-C205, April 2007 Contents – Page 5 CONTENTS 1. GENERAL .............................................................. 9 stationary sea state............................................................ 36 3.5.12 Joint wave height and wave period................................... 37 1.1 Introduction .............................................................9 3.5.13 Freak waves ...................................................................... 37 1.2 Objective...................................................................9 3.6 Long term wave statistics .....................................37 1.3 Scope and application .............................................9 3.6.1 Analysis strategies ............................................................ 37 1.3.1 Environmental conditions...................................................9 3.6.2 Marginal distribution of significant wave height ............. 38 1.3.2 Environmental loads ...........................................................9 3.6.3 Joint distribution of significant wave height and period ..38 3.6.4 Joint distribution of significant wave height 1.4 Relationship to other codes.....................................9 and wind speed ................................................................. 39 3.6.5 Directional effects............................................................. 39 1.5 References ................................................................9 3.6.6 Joint statistics of wind sea and swell................................ 39 1.6 Abbreviations.........................................................10 3.6.7 Long term distribution of individual wave height............ 39 1.7 Symbols...................................................................10 3.7 Extreme value distribution ..................................40 1.7.1 Latin symbols....................................................................10 3.7.1 Design sea state ................................................................ 40 1.7.2 Greek symbols ..................................................................12 3.7.2 Environmental contours.................................................... 40 3.7.3 Extreme individual wave height 2. WIND CONDITIONS.......................................... 14 and extreme crest height................................................... 40 3.7.4 Wave period for extreme individual wave height ............ 41 2.1 Introduction to wind climate ...............................14 3.7.5 Temporal evolution of storms........................................... 41 2.1.1 General..............................................................................14 2.1.2 Wind parameters...............................................................14 4. CURRENT AND TIDE CONDITIONS............. 44 2.2 Wind data ..............................................................14 4.1 Current conditions ................................................44 2.2.1 Wind speed statistics.........................................................14 4.1.1 General.............................................................................. 44 2.3 Wind modelling .....................................................14 4.1.2 Types of current................................................................ 44 2.3.1 Mean wind speed ..............................................................14 4.1.3 Current velocity ................................................................ 44 2.3.2 Wind speed profiles ..........................................................15 4.1.4 Design current profiles ..................................................... 44 2.3.3 Turbulence ........................................................................17 4.1.5 Stretching of current to wave surface............................... 45 2.3.4 Wind spectra .....................................................................19 4.1.6 Numerical simulation of current flows............................. 45 2.3.5 Wind speed process and wind speed field ........................20 4.1.7 Current measurements ...................................................... 45 2.3.6 Wind profile and atmospheric stability.............................22 4.2 Tide conditions ......................................................46 2.4 Transient wind conditions ....................................23 4.2.1 Water depth....................................................................... 46 2.4.1 General..............................................................................23 4.2.2 Tidal levels ....................................................................... 46 2.4.2 Gusts .................................................................................23 4.2.3 Mean still water level ....................................................... 46 2.4.3 Squalls...............................................................................23 4.2.4 Storm surge....................................................................... 46 4.2.5 Maximum still water level................................................ 46 3. WAVE CONDITIONS........................................
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