FED-STD-791D
6.7.2.2 A rating shall be obtained by multiplying the area demerit by the demerit value
assigned in Table III. The rating for each item shall be modified by multiplying by the weight
factor assigned by Table V which will yield a demerit rating.
6.7.2.2.1 Bearing rating and demerits are determined from the following categories:
Rollers
1. face
2. rear
3. front
Cage
4. between rollers
5. rear
6. front
Outer ring 7. path
8. rear
9. front
Sum of
Ratings x 5 (Weight Factor)
11
Demerit for Bearing
Inner ring 10. rear
11. front
6.7.2.3 The total bearing head deposit rating shall be the sum of the demerits for each
item of Table V.
TABLE V. Bearing head deposit weight factor rating.
No.
Item
Weight factor
Demerit
1.
End cover
Multiply rating by
1
=
2.
Spacer and nut
Multiply rating by
2
=
3.
Heater-front
Multiply rating by
3
=
4.
Heater-rear
Multiply rating by
3
=
5.
Seal plate
Multiply rating by
3
=
Multiply rating by
5
=
6.
Bearing
6.7.2.4 The overall rating of the Erdco high temperature bearing head shall be the total
bearing head deposit rating divided by 6.
6.7.2.5 An example of the calculations described is shown in Table VI.
138
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