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 Code Description of component and relevant defect symptom controllable by periodic inspection ?
1 electric accumulator – aging yes
2 filter, sieve, separator – collecting foreign matter yes
3 storage of liquid – aging yes
4 storage of liquid – loss yes
5 storage of gas – loss yes
6 link chain, belt, cable – wear yes
7 coal brush and partner – wear yes
8 component touching, guiding, fixing, working solid products and material – wear, erosion yes
9 lamp – defect no
10 permanently disposed medium – consumption yes
11 surface of running wheel and partner – wear yes
12 power switches > 500 V – contact defect yes
13 friction element of clutch and brake – wear yes
14 sensor touching product – contamination, wear, displacement yes
15 packing box or mechanical seal – leakage yes
16 collector and partner – wear yes
17 thermally stressed material (burner, oven) – aging yes
18 heat exchange surface – contamination yes
19 insulation of flexible moving cable – wear  yes
20 coating of flexible and moving tube – wear yes
21 position 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.