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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 80 of 460
FED-STD-791D
f. Record the number of sections scanned, and the total number of particles according to
size.
7 CALCULATIONS
7.1 Calculation of slot cross sectional area.
T = D -W
where:
T = end area of template slot.
D = depth or thickness of template (cm).
W = width of slot (cm).
7.2 Compute the number of particles per cubic centimeter of grease, using the following
formulas:
25 m or larger:
(A + B + C)
TSN
75 m or larger:
(B + C)
TSN
Over 125m:
C
TSN
where:
A = total number of particles 25 to 75 μm.
B = total number of particles 75 to 125 μm.
C = total number of particles 125 μm or larger.
N = number of sections of grease scanned.
S = length of micrometer scale, cm.
T = end area of template slot, sq cm.
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