Preventing Early Machine Failures: A Proactive Reliability Engineering Approach

Reliability engineering, a core discipline of systems engineering, focuses on ensuring product dependability throughout its lifecycle. One of the most effective tools in this field is the bathtub curve, which illustrates three distinct failure phases: infant mortality, random (constant) failures, and wear‑out.

During the infant mortality phase, components are most vulnerable. Failures here truncate useful life and often lead to costly, unscheduled downtime. Proactive maintenance seeks to push parts into the wear‑out phase, where failure rates are lowest.

Key Causes of Infant Mortality

• Improper lubrication
• Contamination
• Improper installation

Addressing these factors before a failure occurs is far more valuable than post‑mortem Root Cause Failure Analysis. The goal is elimination, not just reaction.

Why Lubrication Matters

Many organizations underestimate the complexity of lubricants. A brand name on a bottle does not guarantee suitability for your application. Proper lubrication is the single most critical element of reliability. It reduces friction, controls temperature, and protects against corrosion and wear.

A common pitfall is outsourcing the lubrication program to the lubricant supplier. Their primary incentive is sales, not plant reliability. Certified lubrication engineers often lack practical plant experience, focusing only on their product line.

Designing an Effective Lubrication Program

Statistics show that 70% of unreliability in rotating assets stems from inadequate lubrication. An effective program covers:

• Lubricant selection and qualification
• Application design and scheduling
• Storage, handling, and delivery logistics
• ISO cleanliness and contamination control
• Route planning, ultrasonic monitoring, and sampling
• Tribological analysis and continuous improvement

Using the wrong lubricant is equivalent to “lipstick on a pig.” It masks underlying issues and accelerates wear.

Understanding Mechanical Wear

Mechanical wear occurs when surfaces slide or roll against each other. Key contributors include:

• Particle contamination—often introduced through degraded lubricants or contaminated seals.
• Moisture, which reacts with lubricant additives to form acids that accelerate oxidation.
• Lubricant starvation, where insufficient film thickness leads to adhesive wear.

Three‑body abrasion (surface fatigue) and metal fatigue from repeated flexing can create pits and eventual catastrophic failure.

The Institute of Mechanical Engineers reports that every $1,000 invested in proper lubrication yields $4,000 in savings, a return of $3,900. This ROI underscores the economic value of a disciplined lubrication strategy.

Corrosion Control

Acidic by‑products form when oil additives react with water. Contamination can enter at manufacturing, via seals, or through misuse of additives (e.g., using extreme‑pressure additives on copper or brass components). A qualified lubrication specialist can audit additive packages and eliminate corrosive pathways.

Maintaining proper lubrication, controlling contamination, and ensuring correct installation extend equipment life and enhance overall plant reliability.

In our next article, we’ll outline step‑by‑step guidance for launching a lubrication program that sustains proactive reliability. Feel free to reach out with questions or topics you’d like covered.