STANDARD DNVGL-ST-0145 Edition April 2016 Offshore substations The electronic pdf version of this document found through http://www.dnvgl.com is the officially binding version. The documents are available free of charge in PDF format. DNV GL AS FOREWORD DNV GL standards contain requirements, principles and acceptance criteria for objects, personnel, organisations and/or operations. © DNV GL AS April 2016 Any comments may be sent by e-mail to [email protected] This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document. The use of this document by others than DNV GL is at the user's sole risk. DNV GL does not accept any liability or responsibility for loss or damages resulting from any use of this document. CHANGES – CURRENT General This document supersedes DNV-OS-J201, November 2013. Text affected by the main changes in this edition is highlighted in red colour. However, if the changes involve a whole chapter, section or sub-section, normally only the title will be in red colour. On 12 September 2013, DNV and GL merged to form DNV GL Group. On 25 November 2013 Det Norske Veritas AS became the 100% shareholder of Germanischer Lloyd SE, the parent company of the GL Group, and on 27 November 2013 Det Norske Veritas AS, company registration number 945 748 931, changed its name to DNV GL AS. For further information, see www.dnvgl.com. Any reference in this document to “Det Norske Veritas AS”, “Det Norske Veritas”, “DNV”, “GL”, “Germanischer Lloyd SE”, “GL Group” or any other legal entity name or trading name presently owned by the DNV GL Group shall therefore also be considered a reference to “DNV GL AS”. Changes – current Main changes April 2016 This document has been totally revised. Editorial corrections In addition to the above stated main changes, editorial corrections may have been made. Standard, DNVGL-ST-0145 – Edition April 2016 Page 3 DNV GL AS CONTENTS CHANGES – CURRENT .................................................................................................. 3 Sec.1 General ....................................................................................................... 11 1.1 Introduction .........................................................................................11 1.1.1 Objectives...................................................................................12 1.1.2 Application..................................................................................12 1.1.3 Certification ................................................................................13 Contents 1.2 Normative references...........................................................................13 1.2.1 General ......................................................................................13 1.3 Informative references.........................................................................13 1.3.1 General ......................................................................................13 1.4 Definitions............................................................................................16 1.4.1 Verbal forms ...............................................................................16 1.4.2 Terms ........................................................................................17 1.4.3 Abbreviations and symbols............................................................20 Sec.2 Formal safety assessment ........................................................................... 23 2.1 General.................................................................................................23 2.2 Safety philosophy.................................................................................23 2.2.1 General ......................................................................................23 2.2.2 Safety objective...........................................................................23 2.2.3 High-level safety assessment.........................................................23 2.2.4 Quality assurance ........................................................................24 2.2.5 Interface management .................................................................24 2.3 High-level safety assessment process ..................................................24 2.3.1 General ......................................................................................24 2.3.2 Hazard identification.....................................................................25 2.3.3 Hazard evaluation ........................................................................26 2.3.4 Risk mitigation and management ...................................................26 2.4 Application in the design process .........................................................27 2.4.1 General ......................................................................................27 2.4.2 Prescriptive approach ...................................................................27 2.4.3 Performance-based approach ........................................................28 Sec.3 Arrangement principles............................................................................... 29 3.1 General.................................................................................................29 3.2 Safety philosophy and design principles...............................................29 3.2.1 General ......................................................................................29 3.2.2 Safety criteria and evaluation ........................................................29 3.2.3 Design basis................................................................................29 3.3 Platform arrangement ..........................................................................30 3.3.1 Substation location.......................................................................30 3.3.2 Manning and type of platforms.......................................................30 3.4 Segregation of areas ............................................................................31 3.4.1 General ......................................................................................31 3.4.2 Hazardous areas ..........................................................................31 3.4.3 Dangerous areas..........................................................................32 3.4.4 Other zones ................................................................................32 3.5 Location of equipment..........................................................................32 3.5.1 General arrangement ...................................................................32 3.5.2 High voltage equipment ................................................................33 Standard, DNVGL-ST-0145 – Edition April 2016 Page 4 DNV GL AS 3.5.3 Submarine power cables ...............................................................33 3.5.4 Emergency power ........................................................................33 3.5.5 Cranes and lay down areas............................................................33 3.5.6 Meteorological mast .....................................................................34 3.5.7 Inlets and outlets.........................................................................34 3.5.8 Safety systems............................................................................34 3.6 Workplaces ..........................................................................................34 3.6.1 General ......................................................................................34 3.6.2 Control room...............................................................................35 Contents 3.6.3 Workshop and storage areas .........................................................35 3.6.4 Accommodation area ....................................................................35 3.6.5 Personal protective equipment.......................................................36 3.6.6 First aid facilities..........................................................................36 3.7 Marking ................................................................................................36 3.8 Documentation.....................................................................................37 Sec.4 Structural design......................................................................................... 38 4.1 General.................................................................................................38 4.2 Safety philosophy and design principles...............................................38 4.2.1 General ......................................................................................38 4.2.2 Safety criteria and evaluation ........................................................39 4.2.3 Design basis................................................................................40 4.2.4 Design process ............................................................................41 4.3 Design by the partial safety factor method...........................................42 4.3.1 Limit states .................................................................................42 4.3.2 Partial safety factor method ..........................................................42 4.3.3 Characteristic load effect...............................................................45 4.3.4 Characteristic resistance ...............................................................45