Page 618 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

582 A-10.
Decimal and Millimeter Equivalents of Fractions

Inches Milli· Inches Milli·
meters met au
Fraction• Decimal3 Freotious Decimal,.
1.44 .• .. .. .. .. .. .. . . .015625 .397 33/64 ••••• ...... .. .. .515625 13.097
1132 •• .. .. .. .03125 .794 17/32 •• ' • . . .. .53125 13.494
3,,f;4 •• .. .. .. .. . . .. .. .046875 l.191 3%4 ••••• .. .. .. .. .. .546875 13.891
1/i6 •• .0625 1.588 9Jl6 •. .5625 14.288
%4 ••• .. .. .. .. .. .. .078125 l.984 l7A4 •• . .. .. .. .. . . . . .578125 14.684
l/32 •• .. .. .. .09375 2.381 19f.i2. . .. .. . . .59375 15.081
7A4 •••.• .. .. .. .. . . .109375 2.778 l9A4, . ... .. .. . . .. .. .609375 15.478
Ya .. .125 3.175 % .. .625 15.875
%4. . .. .. .. .. .. .. .140625 3.572 •1,,i4 •. ... .. .. .. . . . . .640625 16.272
5/32 •• .. .. . . ,15625 3.969 21/32 .•• , .. .. .65625 16.669
11/64. . . .. .. .. .. .. .. ,171875 4.366 '%4. . ... .. .. .. .. .. .671875 17.066
3/J6 •• . 1875 4.763 11;16 •• .6875 17.463
13,44 ••••• .. .. .. .. .. .203125 5.159 45/64 .•••• .. .. .. .. .. .703125 17.859
�- .. .. .. .. ,21875 5.556 23/32 •. . . .. . . .71875 18.256
1%4. . .. .. .. .. .. .. ,234375 5.953 •7A4 •. . .. .. .. .. .. . . .734375 18.653
1A .• ,250 6.350 % .. .750 19.050
17,44 ••••• .. .. .. .. .. .265625 6.747 '%4 •• . .. .. .. .. .. .. .765625 19.447
%2 .. .. .. .. .28125 7.144 25/32, .. .. .. .78125 19.844
l9A4 ••. .. .. .. .. .. .. .296875 7.54! 51.44 .•••• .. .. .. .. .. .796875 20.241
5Jl6 •• ,3125 7.938 13/16 •• .8125 20.638
21/64 ••••• .. .. .. .. .. ,328125 8.334 63,44 .••.• .. .. .. .. .. .828125 21.034
11132, •••• .. .34375 8.731 27/32. . . .. .. .83475 21.431
23,.ti4. . . .. .. .. .. .. .. .359375 9.128 55Ai4 , ••• • .. .. .. .. . . .859375 21.828
% .. .375 9.525 % .. .875 22.225
25,.ti4 .•. .. .. .. .. . . .. .390625 9.922 57,44. . ... .. .. .. .. . . .890625 22.622
13/32 ••. .. .. .40625 10.319 29/32 .. . . .. .. .90625 23.019
27,44 .•••• .. .. .. .. .. .421875 10.716 5%4 •.••. .. .. .. .. .. .921875 23.416
'l'i6 •• .4375 11.113 15fi6 •• .9375 23.813
29A4, . .. .. .. .. .. . . .453125 11.509 61/64. ... .. .. .. .. .. .953125 24.209
15f.i2 .••• • •• .. .46875 11.906 31/J2. . . . .. .. .96875 24.606
31,44. .. .. .. .. . . .. .. .484375 12.303 63,44 •••.• .. .. .. .. .. .984375 25.003
Y2 .. .500 12.700 1. .. l.000 25.400

A-11.
Particle Size Measurement
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Meshes/Lineal Inch Actual Opening Meshes/Lineal Inch
USandASTM US andASTM Actual Opening
Std. Sieve No. Inches Microns Std. Sieve No. Inches Microns
10 .0787 2000 170 .0035 88
12 .0661 1/6 1680 200 .0029 74
14 .0555 1410 .0026 65
16 .0469 3/64 1190 230 .0024 62
18 .0394 1000 270 .0021 53
20 .0331 1/32 840 .0020 50
25 .0280 710 325 .0017 44
30 .0232 590 .0016 40
35 .0197 1/64 500 400 .00142 36
40 .0165 420 .00118 30
45 .0138 350 550 .00099 25
50 .0117 297 625 .00079 20
60 .0098 250 .00059 15
70 .0083 210 1,250 .000394 10
80 .0070 177 1,750 .000315 8
100 .0059 149 2,500 .000197 5
120 .0049 125 5,000 .000099 2.5
140 .0041 105 12,000 .0000394
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* I micron (µ) = 1 micrometer (µm), new National Bureau of Standards terminology
l micron = one-millionth of a meter
Inches X 25,400 = microns or micrometers
Reference ASTM E 11-70