DNVGL-RP-E306 Dynamic positioning vessel design …

1 RECOMMENDED PRACTICEDNV GL ASThe electronic pdf version of this document found through is the officially binding version. The documents are available free of charge in PDF July 2015 Dynamic positioning vessel design philosophy guidelines DNV GL AS July 2015 Any comments may be sent by e-mail to service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document. The use of thisdocument 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 ofthis GL recommended practices contain sound engineering practice and practice, DNVGL-RP-E306 Edition July 2015 Page 3 DNV GL AS Changes currentCHANGES CURRENT GeneralThis document supersedes DNV-RP-E306, September affected by the main changes in this edition is highlighted in red colour.

2 However, if the changes involve a whole chapter, section or sub-section, normally only the title will be in red changes July 2015 GeneralThe revision of this document is part of the DNV GL merger, updating the previous DNV service document into a DNV GL format including updated nomenclature and document reference practice, DNVGL-RP-E306 Edition July 2015 Page 4 DNV GL AS ContentsCONTENTSCHANGES CURRENT .. guidance .. of the document .. and positioning vessel design philosophy .. of station attributes of a robust Dynamic positioning system .. positioning equipment class .. positioning equipment class 1 .. positioning equipment class positioning equipment class society Dynamic positioning requirements .. to terminate.

3 Of failures .. concept and worst case failure design intent .. and post failure Dynamic positioning capability .. elements of Dynamic positioning system performance .. elements of redundant and supporting the redundancy concept .. between redundant systems .. power plant configurations .. and non-critical redundancy .. and , diversity and differentiation .. effective risk class minimum standard .. of the vessel s industrial requirements .. design process .. plots .. forces .. plots for intact and failure of capability plots .. practice, DNVGL-RP-E306 Edition July 2015 Page 5 DNV GL AS .. of by example .. form and safety parameters .. hull form modeling .. systems .. parameters .. of change in design .

4 For management of change .. of change examples .. choices .. basis concepts .. and geometrical arrangement of the propulsors .. interaction .. interaction .. interaction .. number of thrusters .. handling requirements over lifecycle .. thruster hydrodynamic aspects .. drive systems .. of pitch propellers .. variable speed drives .. and maintenance of thrusters .. of measurements .. of the thrusters .. design of the right-angle gear thrusters .. shaft propellers .. selection criteria .. extension of thrusters .. systems .. of marine systems .. oil .. practice, DNVGL-RP-E306 Edition July 2015 Page 6 DNV GL AS water air .. oil systems .. and ventilation .. controlled valves ( Dynamic positioning related).

5 Tight integrity/subdivision integrity .. of a robust redundancy system attributes and studies .. control .. control .. system .. against the effects of fire and philosophy .. power generation .. system distribution .. power distribution .. and routing of cables .. for duty standby pumps .. generators and thrusters .. and closed transformers .. control power supplies and battery systems .. Power and vessel management .. principles of power and vessel management .. effects of power management systems .. prevention .. mission .. recovery .. available .. Topology of vessel and power management systems .. Redundancy requirements for power and vessel management Power available calculation / Remote Load sharing.

6 93 Recommended practice, DNVGL-RP-E306 Edition July 2015 Page 7 DNV GL AS Blackout prevention by load Blackout recovery .. Data Redundancy and criticality analyzers .. Networks and Serial Lines .. alert system .. joystick and manual .. networks .. Uninterruptible power supplies .. from emergency shutdown .. Dynamic positioning control systems .. factors to be considered .. of independent joystick and manual controls .. handling .. or retrofitted sensors .. redundancy .. input/output worst case failure .. modes and features .. interfaces .. system Input parameters (operator inputs and external interfaces).. DP manual change over switch/circuits .. On board trainer/simulator .. Dynamic positioning Dynamic positioning online capability assessment and drift off calculator.

7 Consequence analysis .. Single stern thruster vessels .. Thruster allocation barred zones and thruster bias .. Calculated current .. Automatic Dynamic positioning alert/disconnect .. Other inputs .. DP data logger .. Remote access Joystick sensitivity .. Sensors .. principles ..114 Recommended practice, DNVGL-RP-E306 Edition July 2015 Page 8 DNV GL AS position reference sensors .. location .. motion, heading and environmental sensors .. to be considered in design of sensor systems .. requirements for Dynamic positioning drilling External interfaces .. engineering approach .. Safety systems .. system design which may affect Dynamic positioning .. of machinery spaces .. and gas .. firefighting systems.

8 Shutdown system .. quick closing valves .. Ergonomics .. intervention .. systems integration .. design objectives*).. rules and guidelines .. expectation*).. implementation .. Alarm management .. need for alarm management .. in the development of an alarm management strategy .. to support bridge alarms .. and date stamps .. considerations .. of locations where Dynamic positioning related communication is essential .. of communication (audible and visual) .. topology for audible and verbal communications .. of power supply .. Inspection repair and maintainability .. of maintenance issues on redundancy concepts .. on post failure capability due planned maintenance or repair .. sizing of equipment to enhance post failure of redundant equipment limiting accessibility to IRM.

9 To facilitate maintenance and testing ..133 Recommended practice, DNVGL-RP-E306 Edition July 2015 Page 9 DNV GL AS Commissioning and testing .. influence of commissioning and testing .. acceptance modes and effects analysis testing .. of failure modes and effects analysis proving trials ( black out recovery, automation testing) .. with other testing .. and analyzing all configurations .. following modifications during proving trials .. Deviations from trials procedures or failure to meet pre-requisites for testing .. Categorization of failure modes and effects analysis and proving trials findings .. Acceptance of other tests results in lieu of failure modes and effects analysis testing .. Responsible person in owner s project team for the failure modes and effects analysis.

10 Dynamic and static full load and load acceptance .. Equipment subsystem failure modes and effects analysis and Closing out failure modes and effects analysis findings ..143 App. A Example failure modes and effects analysis 145 App. B Specification for sketches .. 151 App. C Example redundancy concept .. 153 Recommended practice, DNVGL-RP-E306 Edition July 2015 Page 10 DNV GL AS SECTION 1 IntroductionThis recommended practice (RP) is the result of the cooperation between DNV GL and the Marine Technology Society s (MTS) DP Technical Committee. For a complete understanding of the content herein we refer to the acknowledge statement. For a comparison between the MTS publication and this RP we refer to [ ]. This document has been generated by the MTS DP Technical Committee and has been provided to industry as a guidance document to aid in the design of DP This document is not meant to replace any rules, regulations or guidelines that are in existence.