DNV OS E401 - helicopter decks

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Dnv os e401 helicopter decks

Text of DNV OS E401 - helicopter decks

  • 1. OFFSHORE STANDARDDNV-OS-E401 HELICOPTER DECKS OCTOBER 2008This booklet has since the main revision (October 2008) been amended, most recently in October 2009.See the reference to Amendments and Corrections on the next page. DET NORSKE VERITAS

2. FOREWORDDET 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 consultancyservices relating to quality of ships, offshore units and installations, and onshore industries worldwide, and carries out researchin 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 asthe technical basis for DNV offshore services. Recommended Practices. Provide proven technology and sound engineering practice as well as guidance for the higher levelOffshore Service Specifications and Offshore Standards.DNV Offshore Codes are offered within the following areas:A) Qualification, Quality and Safety MethodologyB) Materials TechnologyC) StructuresD) SystemsE) Special FacilitiesF) Pipelines and RisersG) Asset OperationH) Marine OperationsJ) Wind TurbinesO) Subsea SystemsAmendments and CorrectionsWhenever amendments and corrections to the document are necessary, the electronic file will be updated and a new Adobe PDFfile will be generated and made available from the Webshop (http://webshop.dnv.com/global/).Comments may be sent by e-mail to rules@dnv.comFor subscription orders or information about subscription terms, please use distribution@dnv.comComprehensive information about DNV services, research and publications can be found at http://www.dnv.com, or can be obtained from DNV,Veritasveien 1, NO-1322 Hvik, 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, includingphotocopying and recording, without the prior written consent of Det Norske Veritas.Computer Typesetting (Adobe FrameMaker) by Det Norske Veritas.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 personfor 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 DetNorske Veritas. 3. Amended October 2009 Offshore Standard DNV-OS-E401, October 2008see note on front cover Changes Page 3CHANGES Generaldocument located at: http://webshop.dnv.com/global/, underBeing class related, this document is published electronically category Offshore Codes.only (as of October 2008) and a printed version is no longeravailable. The update scheme for this category of documents is Main changesdifferent compared to the one relevant for other offshore doc- Since the previous edition (October 2008), this document hasuments (for which printed versions are available). been amended, latest in October 2009. All changes have beenFor an overview of all types of DNV offshore documents and incorporated. The changes are considered to be of editorialtheir update status, see the Amendments and Correctionsnature, thus no detailed description has been given.DET NORSKE VERITAS 4. Offshore Standard DNV-OS-E401, October 2008Amended October 2009Page 4 Changessee note on front coverDET NORSKE VERITAS 5. Amended October 2009 Offshore Standard DNV-OS-E401, October 2008see note on front cover Contents Page 5 CONTENTSCH. 1 INTRODUCTION ................................................ 7 A 200 Plating ............................................................................. 17A 300 Stiffeners......................................................................... 17Sec. 1Introduction........................................................... 9 A 400 Miscellaneous ................................................................. 17A. General.................................................................................... 9B. Overall Strength....................................................................17A 100 General.............................................................................. 9 B 100 Girders and supporting structures................................... 17A 200 Objectives ......................................................................... 9B 200 Welded aluminium.......................................................... 18A 300 Organisation of this standard ............................................ 9Sec. 4Miscellaneous ...................................................... 19B. Normative References ............................................................ 9B 100 General.............................................................................. 9 A. Connections ..........................................................................19B 200 Offshore service specifications and rules ......................... 9 A 100 Steel and aluminium connections ................................... 19B 300 Offshore standards ............................................................ 9B 400 Other references................................................................ 9B. Safety Net and Tie-Down Points ..........................................19B 100 Safety net ........................................................................ 19C. Informative References........................................................... 9B 200 Tie-down points .............................................................. 19C 100 General.............................................................................. 9Sec. 5Safety Requirements .......................................... 20D. Definitions ............................................................................ 10D 100 Verbal forms ................................................................... 10 A. Safety Requirements.............................................................20A 100 Fire safety ....................................................................... 20E. Abbreviations and Symbols.................................................. 10 A 200 Securing of helicopter onboard....................................... 20E 100 Abbreviations.................................................................. 10A 300 Personnel safety .............................................................. 20E 200 Symbols .......................................................................... 10 A 400 Unit and helicopter communication equipment.............. 20A 500 Guidance related to vessels where the helicopter deckCH. 2 TECHNICAL PROVISIONS ............................ 11is situated directly above tanks containinghydrocarbons................................................................... 20Sec. 1Structural Categorisation and Selectionof Materials .......................................................... 13Sec. 6Helicopter Safety Requirements ....................... 22A. Structural Categorisation ...................................................... 13A. Helicopter Safety Requirements - General ..........................22A 100 General............................................................................ 13A 100 Size of helicopter deck.................................................... 22A 200 Structural category.......................................................... 13A 200 Location .......................................................................... 22A 300 Obstacles......................................................................... 22B. Material Selection................................................................. 13 A 400 Daylight marking ............................................................ 22B 100 General............................................................................ 13A 500 Night operation marking................................................. 22B 200 Design temperatures ....................................................... 13A 600 Instrumentation ............................................................... 23Sec. 2Design Loads and Load Combinations ............. 14 B. Specific Requirements Ship Shaped Units ...........................23A. General.................................................................................. 14 B 100 Approach and take-off sector.......................................... 23A 100 General............................................................................ 14B 200 Obstacles......................................................................... 23A 200 Landing forces ................................................................ 14A 300 Gravity and inertia forces due to units motions andCH. 3 CERTIFICATIONaccelerations.................................................................... 15AND CLASSIFICATION.................................. 25A 400 Sea pressure .................................................................... 15A 500 Green sea......................................................................... 15 Sec. 1General ................................................................ 27A 600 Other loads...................................................................... 15A. Introduction...............................................................