1. وما توفيقي إلا بالله Maintenance Management Overview Dr. Attia Hussien Gomaa Maintenance Engineering Consultant 2008 Engineering service - American University in Cairo (AUC)
2. Refer to BS3811:2000 Maintenance is the work undertaken in order to keep or restore a facility to an acceptable standard level. Maintenance Acceptable level at certain working condition (HSE, working hours, etc.) Acceptable standard level System level (equipment, unit, plant) Facility Unplanned maintenance (Corrective or run to failure policy for non-critical equipment To restore Planned maintenance (Preventive, Predictive and proactive) policy for critical equipment To keep All activities (information, analysis, repair, etc.) Work undertaken
3. Total Maintenance cost = Direct cost + Overhead cost + Downtime cost or = PM cost + CM cost + Downtime cost Cost PM Cost Total Maintenance Cost CM Cost Best level Down Time Cost PM level Reliability
4. Maintenance Management is a powerful systematic methodology to maximize the facility performance and improve the maintenance resource productivity, through optimizing maintenance policies for the critical equipment. Effect on HSE, Process, Standby and Cost Criticality Failure-based, time-based, condition-based, and risk-based Maint. Policy Certain rules and program for long term Policy Resource utilization and efficiency Productivity Materials, manpower, tools, equipment, subcontractors, and cost Resource Utilization + performance + efficiency Effectiveness Applicable and flexible = Organization structure & Team approach Powerful Documented rule-based = Codes & Standards Systematic A total view approach = Good communication (Maintenance, Process, HSE, Inventory, Resource, etc.) Methodology
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6. Criticality Analysis Company Logo HSE Effect Stand By Availability Process Effect Major (B) Without (C) With (D) Minor Minor Major (A) A Fire-fighting system A Steam system A Oil system B Water system C Drain system Criticality Centrifugal Pump (System level)
8. Comparison of different maintenance policies Maximize the system productivity. Integrated approach . Global Minimize the risk of failures for critical systems. Detection of sources of failures. Proactive Discover hidden failures and improve reliability for critical equipment. Maintenance decision based on equipment condition. Predictive Minimize equipment breakdown. Use-based maintenance program. Preventive Minimize maintenance costs for non-critical equipment. Run to failure (fix-it when broke). Reactive Goals Approach Policy
9. A comparison among proactive maintenance approaches Improve system HSE and availability. Determination of an optimum inspection plan for critical systems. RBI Preserve system function & improve reliability. Determination of best maintenance requirements for critical systems. RCM Improve HSE effect. Identification of hazards and problems associated with operations. HAZOP Improve equipment availability. Identification of criticality of failures. FMECA Eliminate failures. Identification of root causes of failures. RCFA Goals Approach Policy
10. Comparison among global maintenance approaches Maximize plant effectiveness and resource productivity. Comprehensive productive-maintenance system. TPM Maximize reliability measures and minimize maintenance cost rates. Optimization approach for the global maintenance system. OSM Goals Approach Policy
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12. Why PM should be done? To prevent equipment failures To detect early failures To discover hidden failures Time-Directed Maintenance (TD) Condition-Directed Maintenance (CD) Failure Finding (FF) Preventive Maintenance:
16. PdM Policy: Vibration analysis: 1- Frequency: Every 300 Running Hours 2- Tool: Vibration Equipment: accelerometers, charge amplifier and analyser. Computer program for trend analysis and prediction. 3- International Standard: CDA/MS/NVSH107 4- Method: Record the vibration spectrum, specify the peaks corresponds to the bearing components Record each component peak and frequency. By using the soft ware and the standard limits, determine the trend of each peak. Determine the bearing state(good –need service –need change) 5- Limits: According to CDA/MS/NVSH107 Pre-failure: vibration level≤5.6 m/s Failure: vibration level 5.6≥10 m/s Near catastrophic failure: vibration level >10 m/s 6- Actions: Bearing is Good Call for bearing change Bearing must be changed immediately
