Deteriorating Components

What is acceptable

The average life time (Mean Time Between Defects) will be
– due to the Defect Symptoms mentioned – generally shorter than ten years.
Indicating also whether a defect can be detected before causing breakdown.

Accepted Deterioration Components

Standard SLC CodeDescription of component and relevant defect symptomcontrollable by periodic inspection ?
1electric accumulator – agingyes
2filter, sieve, separator – collecting foreign matteryes
3storage of liquid – agingyes
4storage of liquid – lossyes
5storage of gas – lossyes
6link chain, belt, cable – wearyes
7coal brush and partner – wearyes
8component touching, guiding, fixing, working solid products and material – wear, erosionyes
9lamp – defectno
10permanently disposed medium – consumptionyes
11surface of running wheel and partner – wearyes
12power switches > 500 V – contact defectyes
13friction element of clutch and brake – wearyes
14sensor touching product – contamination, wear, displacementyes
15packing box or mechanical seal – leakageyes
16collector and partner – wearyes
17thermally stressed material (burner, oven) – agingyes
18heat exchange surface – contaminationyes
19insulation of flexible moving cable – wear yes
20coating of flexible and moving tube – wearyes
21position switch (limit switch, photo cell, initiator) – displacement, loosening no

The three last components printed in italic are explicit no short-life components. However, very frequently they fail due to poor design and operation. Therefore, they require particular attention.

The defects developing with the components, where the last column indicates “yes”, can be found in time by means of periodic inspections.

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Would you tend to expect more components short-life?

Perhaps you believe still other components to be short-life. Watch out! This is a list allowing for frequent defects. Guess the total number of these components installed in your plant and divide this number by the number of defects per year these components are suffering from the defect symptom mentioned; then you arrive at the “Mean Time Between Failures” MTBF. Only when MTBF is smaller than 10 [years], additional components may be entered into this list.