DNVGL-RU-SHIP Pt.4 Ch.10 Steering Gear
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RULES FOR CLASSIFICATION Ships Edition January 2017 Part 4 Systems and components Chapter 10 Steering gear 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 January 2017 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 document supersedes the July 2016 edition. r Changes in this document are highlighted in red colour. However, if the changes involve a whole chapter, u c section or sub-section, normally only the title will be in red colour. - s Main changes January 2017, entering into force 1 July 2017 e g n • Sec.1 General a — Sec.1 [5.5.4]: Updated requirement for monitoring of most probable failures - aligned with IACS UR E25. h C 0 Editorial corrections 1 r In addition to the above stated changes, editorial corrections may have been made. e t p a h C 4 t r a P Rules for classification: Ships — DNVGL-RU-SHIP Pt.4 Ch.10. Edition January 2017 Page 3 Steering gear DNV GL AS CONTENTS s t n e Changes – current.................................................................................................. 3 t n o Section 1 General.................................................................................................... 6 C 1 Introduction.........................................................................................6 0 1 1.1 Application....................................................................................... 6 r 1.2 Nomenclature...................................................................................6 e t 1.3 Definitions....................................................................................... 8 p 1.4 Documentation requirements............................................................10 a h 1.5 Certification requirements................................................................ 13 C 2 Design................................................................................................16 4 2.1 General..........................................................................................16 t r 2.2 Materials........................................................................................ 17 a P 2.3 Arrangement generally.................................................................... 18 2.4 Main steering gear.......................................................................... 18 2.5 Auxiliary steering gear.................................................................... 19 2.6 Exceptions where auxiliary steering gear is not required...................... 20 2.7 Additional requirements for vessels above 70 000 gross tonnage...........20 2.8 Additional requirements for oil carriers, chemical carriers and liquefied gas carriers......................................................................................... 20 2.9 Over balanced rudders.................................................................... 21 2.10 Hydraulics and piping.................................................................... 21 2.11 Actuator and actuating mechanism..................................................23 2.12 Connection between steering gear and rudder stock.......................... 30 2.13 Stopper arrangement.....................................................................37 2.14 Bearings.......................................................................................37 2.15 Oil seals.......................................................................................38 3 Inspection and testing.......................................................................38 3.1 General..........................................................................................38 3.2 Inspection and testing of parts.........................................................38 4 Workshop testing...............................................................................38 4.1 General..........................................................................................38 5 Power supply, control and monitoring...............................................39 5.1 General..........................................................................................39 5.2 Main power supply..........................................................................39 5.3 Emergency power supply................................................................. 39 5.4 Control gear and associated protective functions.................................40 5.5 General requirements, steering gear control system............................ 40 Rules for classification: Ships — DNVGL-RU-SHIP Pt.4 Ch.10. Edition January 2017 Page 4 Steering gear DNV GL AS 5.6 Arrangement of electric and control systems...................................... 41 s 5.7 Monitoring......................................................................................41 t n 5.8 Additional requirements for vessels with DP notation........................... 42 e t 6 Arrangement for installation onboard................................................44 n o 6.1 Fastening arrangement to foundation................................................ 44 C 6.2 Steering gear compartment............................................................. 44 0 7 Installation........................................................................................ 45 1 7.1 Connection between steering gear and rudder stock............................45 r e 7.2 Fastening to foundation................................................................... 45 t p 8 Shipboard testing.............................................................................. 45 a h 8.1 Shipboard testing............................................................................45 C 8.2 Trials............................................................................................. 46 4 8.3 Additional requirements for vessels with DP notation........................... 47 t r a Appendix A Additional requirements for non-duplicated rudder actuators............ 48 P 1 General.............................................................................................. 48 1.1 Application..................................................................................... 48 1.2 Documentation............................................................................... 48 2 Design................................................................................................48 2.1 General..........................................................................................48 2.2 Dynamic loads for fatigue and fracture mechanics analyses.................. 48 2.3 Allowable stresses...........................................................................48 2.4 Burst test...................................................................................... 49 3 Inspection and testing.......................................................................49 3.1 Non-destructive testing....................................................................49 Changes – historic................................................................................................ 51 Rules for classification: Ships — DNVGL-RU-SHIP Pt.4 Ch.10. Edition January 2017 Page 5 Steering gear DNV GL AS SECTION 1 GENERAL 1 n o 1 Introduction i t c 1.1 Application e S 1.1.1 The rules in this section apply to electro hydraulic and hand hydraulic steering gear operating a rudder 0 1 for the purpose of steering the vessel. r 1.1.2 Steering gear, other than electro hydraulic type, will be accepted provided that safety and reliability e t can be documented to be equivalent to or better than the requirements of this section. p a 1.1.3 Requirements for rudders are given in Pt.3 Ch.14 and in rules for classification: High speed and light h craft HSLC Pt.3 Ch.5. C 4 1.1.4 Requirements to steering of podded and geared thrusters are given in Ch.5 Sec.3. Requirements to t steering of water jets are given in Ch.5 Sec.2. r a 1.1.5 For additional requirements for vessel navigation in ice (Ice, PC) see Pt.6 Ch.6 and for Ice breaker P see Pt.5