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Machinery Maintenance

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Predictive Maintenance
Vs
Preventive Maintenance
Mohammud Hanif Dewan
Marine Chief Engineer and Lecturer

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Specific Learning Objective
 Maintenance and it’s types
 Breakdown maintenance
 Preventive Maintenance
 Predictive Mai...

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What is Maintenance?
The technical meaning of
“maintenance” involves
functional checks,
servicing, repairing or
replacing ...

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Types of maintenance
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Machinery Maintenance

  1. 1. Predictive Maintenance Vs Preventive Maintenance Mohammud Hanif Dewan Marine Chief Engineer and Lecturer
  2. 2. Specific Learning Objective  Maintenance and it’s types  Breakdown maintenance  Preventive Maintenance  Predictive Maintenance  Preventive maintenance Vs Predictive maintenance  Predictive maintenance in marine vessels
  3. 3. What is Maintenance? The technical meaning of “maintenance” involves functional checks, servicing, repairing or replacing of necessary devices, equipment, machinery and supporting utilities in industrial and residential installations.
  4. 4. Objectives of Maintenance Minimize loss of productive time Minimize repair time & cost Keep productive assets in working condition Minimize accidents Minimize total maintenance cost Improve quality of products
  5. 5. Types of Maintenance There are main 3 types of Maintenances: 1. Breakdown maintenance or reactive maintenance 2. Preventive maintenance or planned maintenance 3. Predictive maintenance or condition-based maintenance
  6. 6. Breakdown maintenance  It is performed when a machine part breaks down suddenly.  It becomes a repair work  Since there is no plan for the machinery maintenance works, to control the maintenance cost is not possible in this type of maintenance.  It is not suitable for marine vessels  For example, replacing the engine system lub oil when it is fully contaminated or degraded
  7. 7. Breakdown maintenance Advantages  Low cost  Less manpower Disadvantages  Increased cost due to unplanned downtime of equipment  Cost involved with repair or replacement of equipment.  Inefficient use of staff resources.
  8. 8. Preventive Maintenance  It is performed regularly on a machinery as a Planned Maintenance System (PMS) to lessen machinery failure  It is performed while the machine is still working and so avoid unexpected breakdown of machinery.  It’s safe but maintenance cost is very high.  For example, replacing the engine system lub oil after completion of running hours according to PMS/ maker’s instruction
  9. 9. Preventive Maintenance There are few basic activities associated with preventive maintenance:  Inspections: damage, alignment, leaks, cracks, etc.  Servicing: alignment, clearing or replacing filters, and verifying sensor operation  Lubrication: topping off oils or other fluids and at times flushing and replacing the fluid  Fastening: Periodical checks for fastening system for its proper location and alignment.
  10. 10. Preventive Maintenance (PM) Figure: Flow Chart of Preventive Maintenance
  11. 11. Preventive Maintenance (PM) Advantages:  Cost effective during the capital investment processes.  Increased component life  Energy savings  Reduces equipment or process failure  Estimated 12% to 18% cost savings over breakdown maintenance program [2] Disadvantages:  Catastrophic failures still likely to occur due to lack of condition monitoring  Labor intensive  Potential for dropping of performance for unneeded maintenance.  Potential for incidental damage to components during conducting unneeded maintenance
  12. 12. Predictive Maintenance  It’s an advanced scientific technique to maximize operating time and minimize unnecessary work.  Conditions of the machinery can be measured continuously and this enables the maintenance team to plan for an overhauling.  In this maintenance lab analysis method, sensitive instruments and computerized control system are used to predict troubles.  For example, replacing the engine system lub oil on basis of laboratory analysis report and instructions
  13. 13. Predictive Maintenance It monitors the condition of equipment or systems to detect/trend the degradation. Techniques include: 1. Vibration monitoring 2. Thermographic inspection 3. Oil analysis 4. Visual inspection 5. Ultrasonic leak detectors 6. Electrical insulation: A. Megger tests B. Surge comparison 8. Performance testing 9. Wear and dimensional measurements 10. Nondestructive testing A. Ultrasonic B. Borescope inspections C. Eddy current performance
  14. 14. Predictive Maintenance Figure: Flow Chart of Predictive Maintenance
  15. 15. Predictive Maintenance Advantages  Increased component operational life/availability  Allows for preemptive corrective actions  Decrease in machinery downtime  Decrease in costs for parts and labor  Better product quality  Improved worker and environmental safety  Improved worker morale  Energy savings  Estimated 25% to 30% cost savings over breakdown maintenance and 8% to 12% over preventive maintenance Disadvantages  Increased investment in diagnostic equipment.  Increased investment in staff training.
  16. 16. Preventive Maintenance Vs Predictive Maintenance Preventive maintenance Predictive maintenance Definition Preventive maintenance is performed on a regular, predetermined schedule Predictive maintenance is done only when needed based on real time conditions of machinery Trigger Time, meter reading and usage Condition Investment Cost Low Medium/High Cost Savings 12% to 18% [2] 25% to 30% [2] Resources Needed  Maintenance software  Maintenance scheduler  Preventive maintenance checklists  CMMS  Maintenance scheduler  Condition monitoring software  Condition monitoring tools and sensors  PdM training Pros  Better than reactive maintenance or breakdown maintenance  Relatively easy to implement  Maintenance is performed as needed  Reduces maximum amount of downtime Cons  Risk of over-maintaining  Labor intensive (not performed as needed)  Expensive technology needs purchased  Time-intensive to implement correctly
  17. 17. Preventive Maintenance Vs Predictive Maintenance Preventive Maintenance (Time-Based Maintenance) Basic philosophy  Schedule maintenance activities at predetermined time intervals.  Repair or replace damaged equipment before obvious problems occur.  Cost: $13/hp/yr Predictive Maintenance (Condition-Based Maintenance) Basic philosophy  Schedule maintenance activities when mechanical or operational conditions warrant.  Repair or replace damaged equipment before obvious problems occur.  Cost: $9/hp/yr Source: Pro-Active Maintenance for Pumps (Piotrowski, 2001)
  18. 18. Predictive Maintenance in Marine Vessels Predictive maintenance is the most modern maintenance system that should be followed in marine vessels. Because: 1. Preventive maintenance only occurs in accordance with a program’s schedule. Whereas, predictive maintenance technologies continuously monitor in-service equipment, and let crewmembers know when a component needs attention before it fails. For example, Maintenance Tasks Preventive Maintenance Predictive Maintenance Renewing Engine Lub Oil According to running hours as instructed in PMS/Maker’s Manual According to lab analysis report and instructed in lab test report. Overhauling Deck Machinery According to time duration as instructed in PMS/ Maker’s Manual According to CMMS report / Condition analysis Over hauling of Diesel Generator / Main Engine According to running hours as instructed in PMS/Maker’s Manual According to CMMS report / Condition analysis
  19. 19. Predictive Maintenance in Marine Vessels Additional benefits include:  Knowing what parts to stock in advance  Reduced overhead costs  Energy savings  Overall efficiency improvements  Reduced maintenance and repair costs  Improved productivity  Rate of component failures is very less
  20. 20. References 1. Maintenance, P. (n.d.). Preventive and Predictive Maintenance, 1–23. https://www.lce.com/pdfs/The-PMPdM-Program-124.pdf 2. Types of Maintenance Programs by the Department of Energy, O&M Best Practices Guide, Release 3.0 https://www1.eere.energy.gov/femp/pdfs/OM_5.pdf 3. https://www.onupkeep.com/learning/maintenance-types/preventive- predictive 4. https://accendoreliability.com/preventive-maintenance-or-pm-goals-and- activities/ 5. https://www.marineinsight.com/tech/predictive-maintenance-on-board-ships/ 6. https://www.fiixsoftware.com/blog/preventive-maintenance-top-priority/ 7. Gkerekos, Christos & Lazakis, Iraklis & Theotokatos, Gerasimos. (2017). Ship machinery condition monitoring using performance data through supervised learning. 8. Piotrowski, J. April 2, 2001. Pro-Active Maintenance for Pumps, Archives, February 2001, Pump-Zone.com [Report online]. Available URL: http://www.pump- zone.com. Reprinted with permission of Pump-Zone.com.
  21. 21. Any Question? Thankyou!

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