Page 176 - Parker - Process filtration

APPENDIX
Standard Screen Micrometer

Conversion Chart

Relative Size of Particles
US & Actual Magnifi cation 500 times
ASTM Std. Opening Micron
Sieve # (Inches) (µm)
2μm
10 0.0787 2000
74μm
12 0.0661 1680 5μm 200 mesh
14 0.0555 1410
16 0.0469 1190 44μm
325 mesh
18 0.0394 1000 8μm
20 0.0331 840
25 0.0280 710
30 0.0232 590 25μm
149μm
35 0.0197 500 100 mesh
40 0.0165 420
45 0.0138 350 MICROMETER COMPARISONS CONVERSION RATES
50 0.0117 297 Micron 1 cu ft 7.48 gal
Substance
60 0.0098 250 (µm) 1 gal 231 cubic in
70 0.0083 210 Table Salt 100 1 cu ft water 62.42 lb
80 0.0070 177 Human Hair (Avg.) 50-70 1 gal water 8.34 lb
White Blood Cell 25 1 US gal 0.833 lmp gal
100 0.0059 149
Talcum Powder 10 2.31 ft of water =
120 0.0049 125 1 lb/in 2
Cocoa 8-10 2.036 in Hg
140 0.0041 105
Red Blood Cell 8 °F 9 ⁄ (°C+32)
5
170 0.0035 88
Bacteria (cocci) 2 Cks cps ÷ spg
200 0.0029 74
230 0.0024 62 Note: Lower limit of visibility (naked eye) - METRIC CONVERSION
270 0.0021 53 40μm FORMULAE
325 0.0017 44 mm inches x 25.4
400 0.00142 36 m feet x 0.03048
Linear Equivalents
550 0.00099 25 1 in = 25.4mm = 25.400μm cm 3 cu in x 16.39
625 0.00079 20 1mm = 0.0394 in = 1,000μm m 3 cu ft x 0.028
-5
1μm = 3.94 x 10 in = 0.0000394 in
1,250 0.000394 10 kg pounds x 0.454
1,750 0.000315 8 Formulae: kPa psi x 6.895
2,500 0.000197 5 Velocity (ft. per sec) = 0.4085 x gpm lpm gpm x 3.785
2
d (ID in) 5
5,000 0.000099 2.5 °C ⁄ (°F-32)
9
12,000 0.0000394 1 Brake hp = (gpm) x (total head in ft.) x (specifi c gravity)
(3960) x (pump effi ciency)

Specifi cations are subject to change without notifi cation. © 2010 Parker-Hannifi n Corporation
For User Responsibility Statement, see www.parker.com/safety domnick hunter Process Filtration - North America
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