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FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

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'NOTE:This draft dated 15 April 2006' by DasH - Page 138 of 460
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FED-STD-791D
TABLE IV. Description of bearing deposit rating terms.
Type of deposit
Degree
Description
Carbonaceous coating that cannot be removed by
Flaked Carbon
wiping with a rag. Broken blisters, peeling
Over 0.12 cm (3/64-in) in thickness.
Heavy
Ranges from 0.04 cm (1/64-in) to less than 0.12 cm
Moderate
(3/64-in) in thickness.
Ranges from just covering to less than 0.04 cm
Light
(1/64-in) in thickness.
Same as for flaked carbon, blistered, bubbled.
Blistered carbon
Same as for flaked carbon.
Heavy
Same as for flaked carbon.
Moderate
Same as for flaked carbon.
Light
Same as for flaked carbon, ridged, not smooth.
Crinkled carbon
Same as for flaked carbon.
Heavy
Same as for flaked carbon.
Moderate
Same as for flaked carbon.
Light
Same as for flaked carbon, ridged, not smooth.
Smooth carbon
Same as for flaked carbon.
Heavy
Same as for flaked carbon.
Moderate
Same as for flaked carbon.
Light
Same as for flaked carbon, smooth coating.
Smooth carbon
Same as for flaked carbon.
Heavy
Same as for flaked carbon.
Moderate
Same as for flaked carbon.
Light
Shiny, oily emulsion of carbon and oil. Can be wiped
Sludge
off with a rag.
Approximately 0.42 cm (1/16-in) thick.
Heavy
Approximately 0.08 cm (1/32 in) thick.
Moderate
Just covering.
Light
Varnish or lacquer-like coating shiny.
Varnish
Clean - no deposit.
Clean
6.7.2 Computation of overall rating of the Erdco high temperature bearing head.
6.7.2.1 An area demerit shall be determined in accordance with the area covered by the
deposits as follows:
Percent area covered
= Area demerit
10
137



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