Corrective MaintenanceWord document

Sl.no Contents Page. No

1 Introduction to MAINTENANCE 32 Different Type OF MAINTENANCE

Preventive maintenance Corrective maintenance

4-6

3 Differences between corrective and preventive maintenances

7-8

4 Working of corrective maintenance 9-105 Symbols of corrective maintenance 116 Attributes 127 candidates assets 13

2

8 Demerits of corrective maintenance

14

9 Merits of corrective maintenance 1510 References 16

MaintenanceMaintenance:-The process of preserving a condition or situation or the state of being

preserved is termed as maintenance. Maintenance is carried out

following detection of an anomaly and aimed at restoring normal

operating conditions.

This approach is based on the firm belief that the costs sustained for

downtime and repair in case of fault are lower than the investment

required for a maintenance program. This strategy may be cost-effective

until catastrophic faults occur.

3

Different types of maintenance:-There are two major types of maintenance they are:

Preventive maintenance Corrective maintenance

Preventive maintenance:- Preventive maintenance is maintenance that is regularly

performed on a piece of equipment to lessen the likelihood of it

4

failing. Preventative maintenances performed while the

equipment is still working, so that it does not break down

unexpectedly.

Preventive maintenance (PM) has the following meanings:

The care and servicing by personnel for the purpose of maintaining equipment and facilities in satisfactory operating condition by providing for systematic inspection ,detection and correction of incipient failures either before they occur or before they develop into major defects.

Maintenance, including tests, measurements, adjustments, and parts replacement, performed specifically to prevent faults from occurring.

The primary goal of maintenance is to avoid or mitigate the consequences of failure of equipment.

This may be by preventing the failure before it actually occurs which Planned Maintenance and Condition Based Maintenance help to achieve.

It is designed to preserve and restore equipment reliability by replacing worn components before they actually fail.

Preventive maintenance activities include partial or complete overhauls at specified periods, oil changes, lubrication, minor adjustments, and so on.

5

CORRECTIVE MAINTAINENCE:-

Corrective maintenance is a maintenance task performed to identify,

isolate, and rectify a fault so that the failed equipment, machine, or

system can be restored to an operational condition within the tolerances

or limits established for in-service operations

 French official norm defines "corrective maintenance" as maintenance

which is carried out after failure detection and is aimed at restoring an

asset to a condition in which it can perform its intended function 

Corrective maintenance can be subdivided into

6

“immediate corrective maintenance" (in which work starts

immediately after a failure)

"Deferred corrective maintenance" (in which work is delayed in

conformance to a given set of maintenance rules).

Break down maintenance

Shut down maintenance

Difference between corrective

and preventive maintenances:-The set of tasks is destined to correct the defects to be found in the

different equipment and that are communicated to the maintenance

department by users of the same equipment.

While preventive maintenance is generally considered to be

worthwhile, there are risks such as equipment failure or human

error involved when performing preventive maintenance, just as in

any maintenance operation.

7

Preventive maintenance as scheduled overhaul or scheduled

replacement provides two of the three proactive failure

management policies available to the maintenance engineer

Simply

Corrective maintenance is done after problem while preventive is before problem.

Corrective maintenance is done randomly while preventive is done frequently.

8

Preventive maintenance will minimize the need of corrective, while corrective will maximize the preventive actions.

.

9

Working of corrective

maintenance:-

10

Corrective maintenance services:-

11

Symbols of corrective

maintenance:-

12

AttributesListed below are some of the key attributes of a corrective maintenance program

To restore an asset after failure has occurred

• In some cases, a conscious decision is made to neglect an

asset until it fails or until some type of problem emerges.

Where this occurs, this maintenance strategy is therefore also

referred to as “Run to Failure” (RTF) or “Fit and Forget”

(F&F).

• Many owners do not intentionally allow their assets to run

to failure. While they may find that they are neglecting some

of their assets, this is not a conscious decision but rather an

unfortunate consequence of other factors such as inadequate

maintenance budgets, poor planning or ignorance.

• There is a subtle, but very important, distinction that must

be made between Corrective Maintenance (CM) and Reactive

Maintenance (RM).

13

Candidates Assets:-Included below is a list of the criteria to be used in determining which

assets may be acceptable candidates for a corrective maintenance

program

Assets that is not maintainable.

Assets that is disposable and cheaper to

replace than to fix.

Small assets without significant financial

value.

Assets whose downtime is non-critical - that

is, the consequence of failure (Cove) are not

significant.

Assets that are not subject to wear and tear.

Assets that is unlikely to fail during the life of

the building.

14

De merits of corrective maintenance:-

Listed below are some of the disadvantages of the corrective maintenance approach.

Costs - Increased long-term costs due to unplanned equipment downtime

Collateral Damage - Possible secondary equipment or process damage.

Decreased Reliability - Neglect of assets may lead to decreased reliability reflected in downtime.

Risk - greater risk

15

Merits of corrective maintenance:-

The advantages of corrective maintenance can be viewed as a 

double-edged sword and therefore skill and care is required 

when determining which assets should be allowed to run to 

failure. 

Listed below are some of the merits and advantages of the

corrective maintenance approach.

• Costs - Lower short-term costs.

• Staffing - Requires less staff since less work is being done.

16

References:- http://www.assetinsights.net/Glossary/

G_Corrective_Maintenance.html

http://www.bayt.com/en/specialties/q/75127/

what-is-the-difference-between-corrective-

and-preventive-maintenance/

https://en.wikipedia.org/wiki/Maintenance

http://

www.mantenimientopetroquimica.com/en/

typesofmaintenance.html

https://www.google.co.in/search?

q=symbols+of+corrective+maintenance&biw

=1366&bih=643&source=lnms&tbm=isch&sa

=X&ved=0CAYQ_AUoAWoVChMIg5-

ciJCfyAIVThmOCh24tgQ5

17

The

End

.

18