Companies spend millions on preventive maintenance (PM), assuming it increases equipment reliability. ⚠️ It doesn’t.
PM only preserves inherent reliability—it cannot improve it.
🧮 Example:
Machine is designed with (Mean Time Between Failures) MTBF = 1,000 hours.
You perform PM every 500 hours.
If the PM is done well, the MTBF remains 1,000 hours—not 1,500 or 2,000 hours.
💡 Why? Reliability is determined at the design stage through:
✔️Component quality
✔️System configuration
✔️Engineering specifications
✔️Environmental and operating limits
What PM actually does:
✅Prevents degradation and wear
✅Keeps performance at the design baseline
✅Improves availability, not inherent reliability
✅Reduces failures caused by neglect, not design weaknesses
👉 If reliability is poor:
No amount of PM will fix it.
🧠 The only true solution is to redesign or upgrade components.
PM preserves what the design gives you—nothing more.
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