A production model and maintenance planning model for the process industry

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- New production systems, like JIT, with minimum stocks of finished products and work-in-
process, have made interruptions to production costly.

- Failure to deliver on time, with the possible loss of future business, may result from
interruptions to operations.

- Preventive maintenance or correction of defective conditions, not only decreases the cost of
repairs but also maintains the quality and capacity of machinery.

- Utility and service expenses for steam, electricity, gas, water, and the like are reduced by a
continuous maintenance program.

- Adequate planning of maintenance operations will insure that needed spare parts and
materials are on hand.

Table 1: Differences between process industries and discrete industries

Special considerations are applicable to the planning and management of maintenance in plants
which necessarily operate around the clock, like most chemical plants. Much of the maintenance
work can only be done while the plant is shut down. Such a shutdown usually puts an expensive

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