ITT i-ALERT2 - Reliability Overview

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i-ALERT2 Application Guide 8 of 64

RELIABILITY OVERVIEW

Maintenance and Reliability (M&R) practices including condition monitoring are largely governed by the type of assets

being maintained and the associated failure patterns of those assets. Numerous studies have been conducted in both the

Industrial and Aeronautical / Military markets that show the relative frequency or “probability” of failure of equipment. This

data is summarized in Figure 2. What should immediately become apparent is that very few failures are attributable to

“wearing out” or what might be termed an “age-related” failure

pattern.

Those that are age-related are almost all corrosion in seawater applications with a relatively predictable lifecycle.

UAL 1968

Bromberg

1973

US Navy

1982

4% 3% 3%

2% 1% 17%

5% 4% 3%

7% 11% 6%

14% 15% 42%

68% 66% 29%

Conditional Probability of Failure

Time

Failure Curves

Figure 2: Failure curves