dnv2.7-3 2011.pdf

DET NORSKE VERITAS STANDARD FOR CERTIFICATION The content of this service document is the subject of intellectual property rights reserved by Det Norske Veritas AS (DNV). The user accepts that it is prohibited by anyone else but DNV and/or its licensees to offer and/or perform classification, certification and/or verification services, including the issuance of certificates and/or declarations of conformity, wholly or partly, on the basis of and/or pursuant to this document whether free of charge or chargeable, without DNV's prior written consent. DNV is not responsible for the consequences arising from any use of this document by others. No. 2.7-3 PORTABLE OFFSHORE UNITS MAY 2011 FOREWORD DET NORSKE VERITAS (DNV) is an autonomous and independent foundation with the objectives of safeguarding life, property 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. Standards for Certification Standards for Certification (previously Certification Notes) are publications that contain principles, acceptance criteria and practical information related to the Society's consideration of objects, personnel, organisations, services and opera- tions. Standards for Certification also apply as the basis for the issue of certificates and/or declarations that may not nec- essarily be related to classification. All publications may be downloaded from the Society’s Web site The Society reserves the exclusive right to interpret, decide equivalence or make exemptions to this Standard for Certifi- cation. The electronic pdf version of this document found through is the officially binding version © Det Norske Veritas Any comments may be sent by e-mail to rules@ For subscription orders or information about subscription terms, please use distribution@ Computer Typesetting (Adobe Frame Maker) by Det Norske Veritas This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document, and is believed to reflect the best of contemporary technology. The use of this document by others than DNV is at the user's sole risk. DNV does not accept any liability or responsibility for loss or damages resulting from any use of this document. Introduction DNV Standard for Certification No 2.7-3 covers all other types of portable offshore units, other than offshore containers. The standard is built on the DNV Standard for Certification No 2.7-1. It is also the intention that PO Units certified according to this standard will meet all relevant requirements in DNV Rules for Planning and Execution of Marine Operations. This document supersedes the June 2006 edition. Main changes: The main changes are: — Sec.1 (General) is extensively rewritten. — Sec.2 (Certification Procedures) has been updated mainly to reflect the 2.7-1 2006 issue. — Sec.3 (Design) is completely rewritten, examples are: — A new type E has been defined — Design classes are introduced — Design factor depending on weight (and design class) — Maximum weight 100t (or more). — A new Sec.5 (Testing) describes both prototype and production testing. — Sec.7 (Operational restrictions) has been removed and operational restrictions are instead clarified in sections 1 and 3. — Sec.8 (Lifting sets) is new. — A new (form 49.01a) tailor made certificate form and a 2.7-3 emblem (sticker) are described. — Former appendices A and B are removed. (Appendix A is partly included in the new Sec.3, and Appendix B is covered by a Guidance note in 3.4.2). — A new Appendix A on padeye design has been included. Amendment 2011-06-06: The introduction was moved and updated. DET NORSKE VERITAS Standard for Certification - 2.7-3, May 2011 Page 3 CONTENTS 1.General 6 1.1Scope.6 1.1.1Application6 1.1.2Considerations 6 1.1.3Assumptions6 1.1.4Alternative solutions.7 1.1.5Types of PO Units.7 1.2Design and Operation .7 1.2.1Operational aspects.7 1.2.2Operational Procedures.7 1.2.3Single or reoccurring transport(s).8 1.2.4PO Units for subsea use8 1.2.5Design basis9 1.3Relationship with other Codes10 1.3.1DNV Standard for Certification 2.7-1 10 1.3.2DNV Standard for Certification 2.7-2 10 1.3.3VMO Rules.10 1.3.4International codes11 1.3.5National authorities.11 1.4Definitions.11 1.4.1General11 1.4.2Portable Offshore Unit11 1.4.3Offshore container 11 1.4.4Freight container.11 1.4.5Primary Structure12 1.4.6Secondary Structure12 1.4.7Prototype.12 1.4.8Owner12 1.4.9Lifting set12 1.4.10 List of symbols and abbreviations12 1.5Documents for acceptance and information .13 1.5.1General13 1.5.2Required design documentation13 1.6References.13 1.6.1Normative references13 1.6.2Informative references14 2.Certification Procedures . 15 2.1Introduction.15 2.1.1General15 2.1.2Application。