Beyond Preventive Maintenance

Welcome to The Reliable Edge

We guide leaders in redefining reliability and turn it into a competitive edge—one proven idea at a time.

In this issue, let’s talk about a maintenance practice that has existed for decades but is becoming increasingly insufficient for modern industry: time-based preventive maintenance.

For years, organizations relied heavily on the calendar. Change the oil every three months. Replace components every 5,000 hours. Perform inspections every scheduled shutdown.

It felt proactive.

But in today’s fast-moving and highly competitive environment, relying only on the calendar is no longer enough.

Because equipment does not fail based on dates.

It fails based on condition.

And many organizations are discovering that traditional preventive maintenance, while important, often creates as many inefficiencies as it prevents.

Field Insight: The Plant That Was “Doing PM” but Still Struggling

A manufacturing site proudly reported high PM compliance every month. Maintenance schedules were completed consistently, inspections were documented, and shutdown activities were tightly planned.

Yet despite all of this, breakdowns continued.

Emergency work orders remained high. Production losses persisted. Teams were constantly reacting to unexpected failures.

The issue was not the lack of maintenance activity.

The issue was that the maintenance strategy was based more on the calendar than on actual equipment health.

Some assets were being over-maintained long before intervention was needed. Others were developing failures between scheduled inspections without anyone noticing early warning signs.

The turning point came when the organization shifted critical assets toward condition-based monitoring. Instead of asking, “When was the last PM completed?” they started asking, “What is the equipment telling us right now?”

That shift significantly reduced unnecessary interventions, improved planning accuracy, and helped maintenance teams focus attention where it mattered most.

The Hidden Cost of Time-Based Maintenance

Traditional preventive maintenance is built around averages and assumptions.

But no two assets operate under exactly the same conditions.

Load, operating environment, production demand, contamination, operator practices, and process variability all influence equipment life differently.

This creates two major problems.