Page 141 - Shale Shakers Drilling Fluid Systems
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124 SHALE SHAKERS AND DRILLING FLUID SYSTEMS
TABLE 6-2. Tensile Bolting Cloth
Wire Diameter Opening
Open Area
Mesh Inches Mm. Inches Microns (%)
16 x 16 .009 .229 .0535 1359 73.3
18 x 18 .009 .229 .0466 1184 70.2
20 x 20 .009 .229 .0410 1041 67.2
24 x 24 .0075 .191 .0342 869 67.2
28 x 28 .0075 .191 .0282 716 62.4
30 x 30 .0065 .165 .0268 681 64.8
32 x 32 .0065 .165 .0248 630 62.7
36 x 36 .0065 .165 .0213 541 58.7
38 x 38 .0065 .165 .0198 503 56.7
40 x 40 .0065 .165 .0185 470 54.8
42 x 42 .0055 .140 .0183 465 59.1
44 x 44 .0055 .140 .0172 437 57.4
48 x 48 .0055 .140 .0153 389 54.2
50 x 50 .0055 .140 .0145 368 52.6
54 x 54 .0055 .140 .0130 330 49.4
58 x 58 .0045 .114 .0127 323 54.6
60 x 60 .0045 .114 .0122 310 53.3
64 x 64 .0037 .094 .0111 282 50.7
70 x 70 .0037 .094 .0106 269 54.9
72 X 72 .0037 .094 .0102 259 53.8
74 x 74 .0037 .094 .0098 249 52.7
76 x 76 .0037 .094 .0095 241 51.7
80 x 80 .0037 .094 .0088 224 49.6
88 x 88 .0035 .089 .0079 201 47.9
90 x 90 .0035 .089 .0076 193 47.8
94 x 94 .0035 .089 .0071 180 45.0
105 x 105 .0035 .076 .0065 165 45.0
120 x 120 .0025 .064 .0058 147 47.3
145 x 145 .0022 .056 .0047 119 46.4
165 x 165 .0019 .048 .0042 107 47.1
180 x 180 .0018 .046 .0038 96 45.7
200 x 200 .0016 .041 .0034 86 46.2
230 x 230 .0014 .036 .0029 74 46.0
The percent open area is the portion of screen D = Diameter of wire perpendicular to O
surface not blocked by wire and can be calculated direction (inches)
as follows: d = Diameter of wire perpendicular to the
o direction (inches)
Comparing the open area with the ability of a
screen to transmit fluid, a better measure is the
where P = Percentage of open area screen's conductance (or equivalent permeability
O = Length of opening in one direction of the screen cloth). Conductance takes into ac-
along the screen grid (inches) count both the openings and the drag of the fluid
o = Length of opening along screen grid per- on the wires and will be further discussed later in
pendicular to the O direction (inches) this chapter (Table 6-5).
