MAINTENANCE

  1. General

It is essentially important to carry out electrical maintenance on a regular basis; maintaining all the electrical material fittings, appliances, and devices in and around your home. Maintenance enhances the smooth running of all the electricity-powered items in your home while creating a safe environment that will be free from all sorts of hazards.

industries maintenance

Today, we will talk in detail about the planned maintenance of electrical equipment and its importance. A maintenance plan covers a facility’s routine maintenance, as well as the long term care of certain equipment or power systems inside of a facility.

You must first know about the definition of “Equipment Maintenance plan”.

“Electrical equipment maintenance plan (EMP) is the practice of conducting routine inspections, tests, and the servicing of electrical equipment so that impending troubles can be detected and reduced or eliminated.”

Maintenance is all activities performed on equipment and system in order to assess maintains or restores their operational capabilities.

Maintenance has two and only two major sub-clarification.

  1. Corrective maintenance which is performed after the failure of equipment.
  2. Preventive maintenance which, is performed according to pre-determined criteria to reduced the probabilities of equipment failure or of performance degradation.

Corrective maintenance measures the failure of the organization to control degradation while preventive maintenance measures the volume of efforts deviated to that goal the ratio is global measure of the efficiency of the maintenance group.

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1.1. CORRACTIVE MAINTENANCE:

            If includes all tasks performed to restore the functional capabilities of failure equipment or components.

1.2. PREVENTIVE MAINTENANCE

            Preventive maintenance is all activities performed on non-failure equipment or system to avoid or reduce the probability of failure.

            None failed means that they have not broken down or that if failure criteria have been defined that the degradation did not reach that value.

1.3. PERIODIC PM

Periodic PM is sanction to restore part or all of the failure resistance initiated as a function of time regardless of actual condition of equipment.

1.4.CONDITION BASED PM

            Condition based PM is all types of restoration (of un-failed equipment) initiated as a result of condition assessment and comparison with a defined acceptance criteria.

2. THE MOST COMMAN TYPES OF ASSESSMENT TASK INCLUDES

  1. In-service inspection: visual or nondestructive examination used to assess the condition of metallic structure.
  2. In-service testing: Tasks that measure equipment readiness and or performance level in normal or emergency operation.
  3. Monitoring and diagnostics ( PM )

2.1. MONITERING:-

            The goal of monitoring is to avoid costly failure of components by stopping them when their limiting operating parameters are exceeded.

2.2. PRADICTIVE MAINTENANCE

            Predictive maintenance is defined as continuous or periodic monitoring and diagnosis of equipment and components in order to forecast equipment failure.

            Monitoring is often mainly targeted at avoiding failures while predictive maintenance is working towards the same goal plus the goal to reduce unnecessary inspections.

               People often differentiate between preventive and predictive maintenance standards do not

preventive maintenance

3. FREQUNCY OF PM

Frequency will depend upon

  1. Regulating or tech spec requirement.
  2. Vendor’s recommendation.
  3. Continues v/s standby
  4. In plant and industry experience with similar equipment.

4. PREDICTIVE MAINTENANCE TECHNIQUE

  1. Vibration monitoring and diagnosis
  2. Wear particle analysis.
  3. Thermograph.
  4. coast down testing
  5. Visual inspection.
  6. Process parameters monitoring
  7. Electrical equipment and electrical system condition

            i) Insulation resistance

            ii) Surge compression testing

            iii) Motor current signature

            iv) Time domain reflector meter

  • ECT (Eddy current testing )
  • Ultrasonic testing
  • Magnetic particle testing

4.1. CONDUCT OF MAINTENANCE

Procedure and checklists

  1. Pre-requisites.         
  2. Tools and tackles
  3. Spares required
  4. Disassembly / assembly procedure
  5. Acceptance limits
  6. FME instructions
  7. Hold points in check list
  8. Post maintenance testing and performance checking
  9. Recording of data
  10. Pre-job and Post-job briefing

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