Mean Time To Failure (MTTF)

A high MTTF value indicates that assets are expected to operate for an extended period before encountering their first failure. This suggests a high level of reliability and durability, reducing the frequency of unexpected breakdowns.

Low MTTF value suggests that assets are more prone to early failures. This may necessitate more frequent maintenance or replacement, impacting reliability and operational continuity.

Several factors influence MTTF, including:

• Component Quality: The quality and design of components play a significant role in determining their MTTF. High-quality components are likely to have longer MTTF values.
• Environmental Conditions: Harsh environmental conditions, such as extreme temperatures, humidity, or corrosive environments, can reduce MTTF.
• Maintenance Practices: Regular and effective maintenance can extend MTTF by addressing wear and tear, and other factors that contribute to degradation.
• Operational Stress: The level of stress or load that a component or system experiences during normal operation can impact its MTTF. Higher stress levels can lead to shorter MTTF.
• Manufacturing Variability: Variability in manufacturing processes can affect the consistency of component quality and, subsequently, MTTF.

MTTF goals can vary depending on industry, asset criticality, and operational requirements. However, the overarching goal is to maximize MTTF to improve asset reliability and reduce the frequency of unexpected failures. Some industries with critical assets, such as aerospace and healthcare, may have more stringent MTTF goals than others.

Use the equipment criticality assessment matrix to set your MTTF goals.

• Ensure that all time units (e.g., hours, days) are consistent throughout the calculation.
• Consider the length of the data collection period. Longer data collection periods may provide more reliable MTTF estimates.
• Account for any environmental or operational factors that may impact MTTF. For instance, consider whether the asset operates continuously or intermittently.