RULES FOR CLASSIFICATION Ships Edition October 2015 Part 6 Additional class notations Chapter 6 Cold climate The content of this service document is the subject of intellectual property rights reserved by DNV GL AS ("DNV GL"). The user accepts that it is prohibited by anyone else but DNV GL 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 GL's prior written consent. DNV GL is not responsible for the consequences arising from any use of this document by others. The electronic pdf version of this document, available free of charge from http://www.dnvgl.com, is the officially binding version. DNV GL AS FOREWORD DNV GL rules for classification contain procedural and technical requirements related to obtaining and retaining a class certificate. The rules represent all requirements adopted by the Society as basis for classification. © DNV GL AS October 2015 Any comments may be sent by e-mail to [email protected] If any person suffers loss or damage which is proved to have been caused by any negligent act or omission of DNV GL, then DNV GL 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 compensation shall never exceed USD 2 million. In this provision "DNV GL" shall mean DNV GL AS, its direct and indirect owners as well as all its affiliates, subsidiaries, directors, officers, employees, agents and any other acting on behalf of DNV GL. CHANGES – CURRENT t n e r This is a new document. r u The rules enter into force 1 January 2016. c - s e g n a h C 6 r e t p a h C 6 t r a P Rules for classification: Ships — DNVGL-RU-SHIP-Pt6Ch6. Edition October 2015 Page 3 Cold climate DNV GL AS s t CONTENTS n e t n Changes – current...................................................................................................... 3 o C Section 1 Basic ice strengthening - Ice....................................................................10 6 1 General................................................................................................. 10 r 1.1 Introduction.......................................................................................10 e t 1.2 Scope............................................................................................... 10 p a 1.3 Application.........................................................................................10 h 1.4 Class notations.................................................................................. 10 C 1.5 Definitions......................................................................................... 11 6 t 2 Documentation......................................................................................11 r 2.1 Documentation requirements............................................................... 11 a P 3 Marking and onboard documentation................................................... 11 3.1 General............................................................................................. 11 4 Materials............................................................................................... 12 4.1 General............................................................................................. 12 5 Loading conditions................................................................................13 6 Structural requirements for the class notation Ice(C).......................... 13 6.1 General............................................................................................. 13 6.2 Plating.............................................................................................. 13 6.3 Framing.............................................................................................13 6.4 Stringers and web frames................................................................... 13 6.5 Weld connections............................................................................... 13 6.6 Rudder and steering arrangement........................................................ 14 6.7 Stem................................................................................................ 14 7 Machinery requirements for class notation Ice(C)................................ 14 7.1 Output of propulsion machinery........................................................... 14 7.2 Design of propeller and propeller shaft..................................................14 7.3 Sea suctions and discharges................................................................ 18 8 Structural requirements for class notation Ice(E).................................18 8.1 General............................................................................................. 18 8.2 Plating.............................................................................................. 19 8.3 Frames..............................................................................................19 8.4 Stem................................................................................................ 19 9 Machinery requirements for class notation Ice(E)................................ 19 9.1 Propellers.......................................................................................... 19 Rules for classification: Ships — DNVGL-RU-SHIP-Pt6Ch6. Edition October 2015 Page 4 Cold climate DNV GL AS 9.2 Propeller shafts, intermediate shafts, thrust shafts..................................21 s 9.3 Shrunk joints..................................................................................... 22 t n 9.4 Gears................................................................................................23 e t 9.5 Sea chests and discharge valves.......................................................... 23 n o 9.6 Steering gear.....................................................................................23 C 9.7 Electric propeller drive........................................................................ 23 6 Section 2 Ice strengthening for the Northern Baltic - Ice........................................ 24 r e 1 General................................................................................................. 24 t p 1.1 Introduction.......................................................................................24 a 1.2 Scope............................................................................................... 24 h C 1.3 Application.........................................................................................24 6 1.4 Class notations.................................................................................. 24 t r 1.5 Definitions......................................................................................... 25 a 2 Documentation......................................................................................26 P 2.1 Documentation requirements............................................................... 26 3 Marking and onboard documentation................................................... 27 3.1 General............................................................................................. 27 4 Assumptions......................................................................................... 27 4.1 General............................................................................................. 27 5 Materials............................................................................................... 29 5.1 General............................................................................................. 29 6 Loading conditions................................................................................29 7 Design loads......................................................................................... 29 7.1 Height of the ice load area..................................................................29 7.2 Ice pressure...................................................................................... 29 8 Shell plating......................................................................................... 31 8.1 Vertical extension of ice strengthening for plating...................................31 8.2 Plate thickness in the ice belt.............................................................. 32 9 Frames..................................................................................................33 9.1 Vertical extension of ice framing.......................................................... 33 9.2 Transverse frames.............................................................................. 33 9.3 Longitudinal frames............................................................................ 35 9.4 Structural details................................................................................36 10 Ice stringers....................................................................................... 37 10.1 Stringers within the ice belt...............................................................37 10.2 Stringers outside the ice belt............................................................. 37 10.3 Deck strips...................................................................................... 38 11 Web frames.......................................................................................