1 / 25

Condition monitoring

Condition monitoring. - a Class perspective. Eirik Sanderlien and Jan Bühring Andersen, DNV Machinery Ships in Operation 02. April 2008. Condition based maintenance, CBM. Why do Condition monitoring Optimization Class follow up Challenges when doing Condition Based maintenance

zelig
Download Presentation

Condition monitoring

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Condition monitoring - a Class perspective Eirik Sanderlien and Jan Bühring Andersen, DNV Machinery Ships in Operation 02. April 2008

  2. Condition based maintenance, CBM • Why do Condition monitoring • Optimization • Class follow up • Challenges when doing Condition Based maintenance • DNV’s experience related to Condition Based maintenance • DNV; the Class perspective © Det Norske Veritas AS. All rights reserved

  3. If successfully implemented Improved spare part control Reduced opening up, maintenance introduces damages and maintenance costs/time Flexible maintenance intervals due improved knowledge & control of machinery, availability, performance and condition documented. Improved crew motivation © Det Norske Veritas AS. All rights reserved

  4. Why do condition monitoring? Class related to Condition Based Maintenance • Avoid unnecessary opening up • Class usually either rely on 5 year class intervals or makers maintenance intervals • By the use of trending of the equipments condition and a DNV approved Machinery CM program/ survey arrangement,maintenance intervals can be based on the actual condition of the equipment • Cost beneficial • Less time spent on survey/ inspection / opening up: • Only annual audits of an approved CM program © Det Norske Veritas AS. All rights reserved

  5. Why is Condition based maintenance a challenge? • Implementation of CBM • Frequent crew changes, no formalised qualification scheme • One onshore org., several offshore org. • Investment horizon • Procedures • The overall maintenance approach • Not defined • Backed by top management/ all involved parties? • Follow up • Training • Analysis • Routines • Actions taken © Det Norske Veritas AS. All rights reserved

  6. How to manage the challenge? © Det Norske Veritas AS. All rights reserved

  7. Implementation of CBM 1st approach • Install newly purchased equipment on board and wait for the success stories! Technology © Det Norske Veritas AS. All rights reserved

  8. 2nd approach • Controlled use of the technology • Establish a company CBM work process including several aspects. • Establish a CBM company culture. • Measure and follow up that expected CBM benefits are realised! Work process Technology Culture * Implementation of CBM © Det Norske Veritas AS. All rights reserved

  9. Overall maintenance approach © Det Norske Veritas AS. All rights reserved

  10. Strategy & Goals Responsibility QA Company procedures PMS Equipment & tools Training Work procedure Everything must work together • Ensure that CBM handling meshes with company Strategy & Goals • Fix broken teeth! • Insert missing wheels and ensure proper lubrication * © Det Norske Veritas AS. All rights reserved

  11. DNV Class experience what is working © Det Norske Veritas AS. All rights reserved

  12. DNV Class experience • Developing the strategy • Include the crew • Management involvement • Establish time horizon • Analysis by 3 part or crew • Implementation • Maintenance approach reflected in company / working procedures and PMS • Training of crew • Procedures implemented onboard © Det Norske Veritas AS. All rights reserved

  13. Waterjet CM Thruster CM Machinery CM Steam Turbines © Det Norske Veritas AS. All rights reserved

  14. Machinery CM: • All machinery (subject to Class); • Vibration analysis (not including diesel engines) • Oil analysis • Temperature/ pressure monitoring • Thruster/ Water jet CM: • Propulsion and/ or DYNPOS thrusters/ Water jets; • Vibration analysis of bearings and gears • Oil analysis • Turbine CM: • Propulsion Steam turbine plants: • Main and Aux turbines • Reduction gears • Turbo generators • Steam driven pumps © Det Norske Veritas AS. All rights reserved

  15. DNV: Machinery CM Normal approach of approval / surveys related to CM Company approval and Vessel specific approval Survey Arrangement CM is granted! Annualsurvey Initial survey on board © Det Norske Veritas AS. All rights reserved

  16. Company approval • Based on documents from the management covering: • Maintenance Strategy • Philosophy • responsibility chart • Training programme and plan • Future crew members • Elements in training programme • Crew rotation with regards to maintain qualified personell on board at all times © Det Norske Veritas AS. All rights reserved

  17. Based on documents from the management covering: - Monitoring methods • Detailed description of CM technique used • Component information / forcing frequencies • Schematic sketch of each component with clearly marked measuring positions • Frequency ranges/Baseline data/Pre-defined alarms • Relevant pre-defined actions based on cm results - Condition Monitoring equipment • Equipment data sheets (sensors, collectors, analysing system) - Implementation in PMS • Examples of cm jobs in the PMS • Procedures on how to handle cm results - Programme for oil analysis • Vessel specific approval © Det Norske Veritas AS. All rights reserved

  18. Initial survey • Including verification of • Crew familiarity with measuring equipment • Crew familiarity with interpreting measurement results (spectra)/trends • Marking of measuring positions • Baseline measurements • Requirements / guidelines related to draft / sea state / engine load © Det Norske Veritas AS. All rights reserved

  19. Survey Arrangement Condition Monitoring • The survey arrangement CM is granted and certificate issued based on: • Company approval • Vessel specific approval • Acceptance of results from Initial survey © Det Norske Veritas AS. All rights reserved

  20. Annual survey • Main objective is to confirm that the system is working as approved/intended • Verify that the CE is familiar with the objectives of this survey arrangement • Verify the crew familiarity with equipment and measured results • Evaluation of measurements since last annual • Annual CM survey is credited, not the machinery items • Machinery items are credited after overhaul © Det Norske Veritas AS. All rights reserved

  21. DNV’s Machinery survey arrangement characteristics: *) Initial survey fee not included! © Det Norske Veritas AS. All rights reserved

  22. Machinery survey Arrangements • Machinery Survey Arrangement – DNV Fleet Updated 21. September 2007 © Det Norske Veritas AS. All rights reserved

  23. Condition based maintenance is the future! • Increased pressure in the market • Less time for maintenance • No unnecessary maintenance • More predictability • Planning of down time and avoid unscheduled maintenance • Better spare part control © Det Norske Veritas AS. All rights reserved

  24. DNV Rule references: • DNV Rules, Ships in Operation: • Pt. 7 Ch. 1, Sec. 8, July 2007 • Classification Note 10.2 • Guidance for condition monitoring, January 2003 • New updated version under preparation • valid from medio 2008 © Det Norske Veritas AS. All rights reserved

  25. http://vids.myspace.com/index.cfm?fuseaction=vids.individual&videoid=2033120351http://vids.myspace.com/index.cfm?fuseaction=vids.individual&videoid=2033120351 © Det Norske Veritas AS. All rights reserved

More Related