Improved maintenance manpower schedules and

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improved maintenance manpower schedules and utilization and production plans by indicating as correctly as possible the service timings and frequencies. The analysis of failure parts or poor material, bad workmanship, both by production or the maintenance workers, faulty design, and faulty operation (indicating that the operator needs training). In the planned maintenance systems, one important area, which ahs to be taken care of is calibration. This function is so important that it has to be catered to separately and specifically because, without calibration checks, one is not sure of the output results. Hence, the needs for calibration with properly trained manpower become imperative. 10.3.2.4 Preventive Maintenance Preventive maintenance system refers to those critical systems, which have to reduce the likelihood of failures ot the absolute minimum, for example, operation of an aircraft, which files from one place to another, or critical installation s within power plant, and the forced ventilation system in underground mines. To prevent breakdowns, preventive planned servicing is carried out with the specific objective of detecting locating weak areas and ensuring perfect functioning by even replacing certain critical parts which could still be used, but-for the assurance or ratability we demand. Thus, after each servicing, the equipment is considered to be as good
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138 as new and is expected to give a high level of reliable performance. It maybe noted that in addition to this servicing, planned inspection and servicing will continue to be carried out in the interval between two planned preventive servicing which are also aimed at achieving elimination of possible breakdowns. Thus at an added cost, a very high level of reliability of performance is assure or obtained. Planning and implementation of preventive maintenance system with the added cost of replacement of certain parts / components before they actually do fail, makes this an expensive system, and hence ought to be applied with caution and care to really critical equipment only. Statistical methods are usually employed to determine the life expectancy’ of components / parts / spares to fix the replacement periods accurately. In large complex plants, therefore, preventive engineering has been established and is becoming an important need and function. This basically involves a detailed analysis of breakdown failures and incidents. An incident is defined as happenings, which might lead to, or is a prelude to a serious accident or failure. The analysis indicated the areas of concern where real effort is needed, and where one can reduce chances of breakdown by redesigning, substitution, changes in specification, material or Design improvement, and modifications.
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