Three types of maintenance?
- preventive
- predictive
- reactive
what is the primary purpose of preventive maintenance?
Increase production time between overhauls.
what are the goals of preventive maintenance?
- machinery uptime and production
- maintenance labour productivity
- product quality
- spare parts inventory
what are the steps of preventive maintenance?
- identify equipment that is crucial to production or that requires a high level of maintenance activity
- Identify parameter’s (like vibrations) that gauge machine condition, then periodically inspect and trend parameter levels
- develop limits or rates of change for which correction is mandatory
- plan maintenance activity when exceeding limits or rates.
What type of maintenance would NDT testing fall under?
preventive maintenance
What is predictive maintenance?
a program of monitoring, measuring, and analyzing results to predict the wear rate and expected repair schedule for machinery.
what is required for predictive maintenance?
a baseline
The baseline can be used for both predictive and _________ maintenance?
preventive
Predictive maintenance inspections involve the use of measuring devices that quantify the condition of the equipment. what types of tests are used to identify changes from baseline?
Vibration readings
- Infrared thermography
- NDT
- electrical insulation resistance
What is the main difference between preventive and predictive maintenance?
When the Maintenance is preformed. Preventive maintenance are performed at regular intervals regardless of the machines condition.
disadvantage of preventive Maintenance is parts may be changed before they need to be
What is reactive Maintenance?
Maintenance performed once the machine is no longer operating properly
what is a main problem of reactive maintenance?
May cause more costly problems or safety problems waiting until failure
what should be done after changing out a failed part?
inspect and try to figure out the reason for failure
When PMing a machine check :
- Machine overload
- Bolts
- cleanliness
- Air and hydraulic Cylinders
- Fire
- Bearings
- noise and Vibration
- overhead crane
- Roller Chain
- Compressors
- couplings
