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DNV Ship Rules Pt.5 Ch.1

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DNV Ship Rules Pt.5 Ch.1 RULES FOR CLASSIFICATION OF SHIPS NEWBUILDINGS SPECIAL SERVICE AND TYPE ADDITIONAL CLASS PART 5 CHAPTER 1 SHIPS FOR NAVIGATION IN ICE JULY 2006 CONTENTS PAGE Sec. 1 General Requirements ................................................................................................................ 5 Sec. 2 Basic Ice Strengthening.............................................................................................................. 6 Sec. 3 Ice Strengthening for the Northern Baltic ..................................................................................8 Sec. 4 Vessels for Arctic and Ice Breaking Service ........................................................................... 19 Sec. 5 Sealers ..................................................................................................................................... 35 Sec. 6 Winterization ............................................................................................................................ 36 Sec. 7 DAT(-X°C) ................................................................................................................................38 DET NORSKE VERITAS Veritasveien 1, NO-1322 Høvik, Norway Tel.: +47 67 57 99 00 Fax: +47 67 57 99 11 CHANGES IN THE RULES General sions has been undertaken. Previous Fig.4, now Fig.3, has been revised accordingly. The present edition of the rules includes additions and amendments — In item B201, additional members have been categorized. decided by the Board in June 2006 and supersedes the January 2006 — In item D400, correction factors for local ice pressures have been edition of the same chapter. revised based on experience and work related to IACS Polar The rule changes come into force as indicated below. Code development. The factors have been revised from 0.25 for bottom area to a differentiation of 0.20 for vessels with notation This chapter is valid until superseded by a revised chapter. Supple- ICEBREAKER or POLAR, and 0.10 for vessels with notation ments will not be issued except for minor amendments and an updated ICE only. Differentiation has also been introduced keeping 1.0 list of corrections presented in Pt.0 Ch.1 Sec.3. Pt.0 Ch.1 is normally for the stem area for vessels with notation ICEBREAKER or revised in January and July each year. POLAR, and introducing 0.8 for vessels with ICE notation only, Revised chapters will be forwarded to all subscribers to the rules. fitted with pod or thruster propulsion units. Buyers of reprints are advised to check the updated list of rule chap- — In item F302, the me-factors in Table F1 have been changed for ters printed in Pt.0 Ch.1 Sec.1 to ensure that the chapter is current. balancing the required moment capacity to be generally consist- ent with that for longitudinal stiffeners. — A new sub-section element G700 has been introduced with basic rules for dimensioning of podded propulsors and azimuth thrust- Main changes coming into force 1 January 2007 ers, including supporting structure. Over the last few years there has been a rapid technological shift in the design of relevant ves- • Sec.1 General Requirements sels, a new standard practice having evolved which now needs to Sec.2 Basic Ice Strengthening be implemented in the rules. σ — In item Sec.1 B101, the definition text of F has been modified. — Sec.1 and Sec.2 have been modified to cover a new additional, • Sec.6 Winterization basic class notation ICE-E. As a consequence, the notation ICE- — This section has been amended to make the requirements for CP C becomes an intermediate notation between the ICE-1C and the propellers, electric propulsion and stainless steel propellers ap- ICE-E notations. plicable to vessels with Winterized Arctic notation instead of vessels with Winterized notation. As a consequence, item B102 • Sec.3 Ice Strengthening for the Northern Baltic and item B103 have been deleted and relocated as item E102 and — Item D301 has been modified so that m1 = 12 has been changed item E103. Also, sub-section element E300 has been deleted and to m1 = 11 in the last list item. Further, under item D402, the first item E301 has been moved to E104. paragraph of list item 3) has been replaced by: ° The web thickness of the frames need not exceed one half of the • Sec.7 DAT(-X C) thickness of the shell plating, calculated for a frame spacing of —The DAT(-XºC) requirements, previously found in Sec.4, have 0.45 m, assuming the yield stress of the plate not more than that been collected and made more visible in a separate new section, used for the frame, minimum 9 mm. Sec.7. The reason for the change is to align the rules with the new guide- lines of the Finnish Maritime Authorities. • Sec.4 Vessels for Arctic and Ice Breaking Service Corrections and Clarifications — In item A403 (previous item A405), the upper transition area def- In addition to the above stated rule requirements, a number of correc- initions have been removed. A general revision of vertical exten- tions and clarifications have been made in the existing rule text. Comments to the rules 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 and the Society's services is found at the Web site http://www.dnv.com © 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. Rules for Ships, July 2006 Pt.5 Ch.1 Contents – Page 3 CONTENTS SEC. 1 GENERAL REQUIREMENTS .......................... 5 I. Special Arrangement and Strengthening Aft .................. 14 I 100 Stern ................................................................................14 A. Classification..........................................................................5 I 200 Rudder and steering arrangements .................................14 A 100 Application........................................................................5 A 200 Class notations ..................................................................5 J. Machinery ........................................................................... 14 J 100 Engine output..................................................................14 B. Definitions..............................................................................5 J 200 Design loads for propeller and shafting..........................16 B 100 Symbols.............................................................................5 J 300 Propeller..........................................................................16 B 200 Terms ................................................................................5 J 400 Propulsion shaft line reinforcement................................17 J 500 Miscellaneous machinery requirements..........................18 C. Documentation ......................................................................5 C 100 General..............................................................................5 SEC. 4 VESSELS FOR ARCTIC AND ICE BREAKING SERVICE ........................................................... 19 SEC. 2 BASIC ICE STRENGTHENING ....................... 6 A. General................................................................................ 19 A. General...................................................................................6 A 100 Classification ..................................................................19 A 100 Classification.....................................................................6 A 200 Scope...............................................................................19 A 300 Design principles and assumptions.................................19 B. Structural requirements for the class notation ICE-C.......6 A 400 Definitions.......................................................................19 B 100 General..............................................................................6 A 500 Documentation................................................................20 B 200 Plating ...............................................................................6 B 300 Framing .............................................................................6 B. Materials and Corrosion Protection................................. 21 B 400 Stringers ............................................................................6 B 100 Design temperatures........................................................21 B 500 Weld connections..............................................................6 B 200 Selection of steel grades..................................................21 B 600 Sternframe and rudder ......................................................6 B 300 Coatings ..........................................................................21 B 400 Corrosion additions.........................................................21 C. Machinery..............................................................................6
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