16 Questions
What is the main advantage of Breakdown Maintenance?
No scheduling required
What is the main disadvantage of Preventive Maintenance?
Higher costs due to improper repair
What is the main purpose of Predictive Maintenance?
To determine the health of machinery
What is an example of Predictive Maintenance?
Sampling oil from a vehicle's engine for metal shavings
What is a disadvantage of Breakdown Maintenance?
Unplanned production losses
What is an advantage of Preventive Maintenance?
Longer machine life
When is Preventive Maintenance typically performed?
Every morning or every 2nd to 3rd day
What is a characteristic of Breakdown Maintenance?
Use or operate equipment until it breaks down
What is the primary aim of Total Productive Maintenance (TPM)?
To increase the Overall Equipment Effectiveness of plant equipment (OEE)
What is the main objective of Project Maintenance?
To perform maintenance on a specific part of the plant
What is the benefit of Autonomous Maintenance in TPM?
It gives operators greater ownership of their equipment
What is the term used by Eskom to describe the shutdown of a part of the plant for maintenance?
Outage
What is the disadvantage of not analyzing the information gathered from inspection and monitoring?
Future maintenance needs may not be identified
What is the term used to describe the process of maintaining the plant or equipment in good condition?
Deterioration prevention
What is the main factor that affects the implementation of TPM?
Commitment to training
What is the term used to describe the percentage of time that a machine is available for production?
Availability
Study Notes
Maintenance Strategies
Breakdown Maintenance
- Involves running equipment until it fails, then repairing or replacing it
- Often used for non-critical or inexpensive equipment
- Advantages: no scheduling required, some equipment cheaper to replace than repair
- Disadvantages: unplanned production losses, catastrophic equipment failure, high spares inventory costs, secondary machinery damage
Preventive Maintenance
- Planned maintenance performed at regular intervals (e.g., daily or every 2-3 days)
- Examples include greasing conveyor belt bearings
- Advantages: longer machine life, reduced production downtime, fewer spares required
- Disadvantages: potential unplanned production losses, unnecessary repairs or replacements
Predictive Maintenance
- Involves inspecting or testing equipment to determine its condition
- Uses condition monitoring equipment (e.g., vibration monitoring, contamination monitoring)
- Example: oil sampling in vehicles to predict engine, transmission, or differential overhaul
- Advantages: reduces unscheduled downtime, extends maintenance repair intervals, minimizes unnecessary repairs
- Disadvantages: high initial investment, potential lack of commitment to training, inspection data may not be analyzed
Project Maintenance
- Combination of various maintenance strategies with a single plan and set timeline
- Often referred to as "general overhauls" or "shutdown maintenance"
- Examples: Eskom's "outage" or "shutdown" maintenance, where a plant subsystem is disassembled and repaired over 2-5 months
Total Productive Maintenance (TPM)
- Aims to identify and prevent issues before they occur (deterioration prevention)
- Focuses on proactive and preventative techniques to improve equipment reliability
- Goals: increase Overall Equipment Effectiveness (OEE), maintain equipment in good condition without interfering with daily processes
- OEE factors: Performance, Availability, Quality
- Autonomous Maintenance: operators perform daily inspections, maintenance, and repairs, giving them greater "ownership" of equipment.
This quiz covers two common maintenance strategies: Breakdown Maintenance and Preventive Maintenance, including their advantages and disadvantages.
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