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Straining Element Selection / Model Information


Figure 3 - Wedge-Wire Straining Elements

Straining Element Selection

The Model SFA Straining Element (Fig. 3) is an extremely rugged, single-piece unit available in a variety of standard and custom openings and materials.

Screen opening should be selected based on the amount of protection necessary, and not on the smallest opening available. By specifying a smaller opening than needed, more debris will be retained and subsequently result in longer cleaning durations and increased backwash fluid loss. Also, smaller than necessary screen openings will reduce open screen area and increase pressure loss.

The screen opening should be approximately one-third (1/3) to one half (1/2) the largest size particle that can safely pass downstream. Example: A strainer protecting spray nozzles with a 1/16" orifice would be supplied with a 1/32" screen opening.

Straining Element Selection Guide

Standard
Slot Opening (inches)
Fraction Equivalent inches (mm)
Mesh Equivalent
Micron Equivalent
% Open Area
0.003
(0.08)
200
75
9
0.006
(0.15)
100
149
16.5
0.010
(0.25)
50
250
17.5
0.015
1/64 (0.4)
40
385
24
0.020
(0.5)
35
500
30
0.032
1/32 (0.8)
20
795
40
0.062
1/16 (1.6)
10
1590
51
0.125
1/8 (3.2)
6
3205
67
0.187
3/16 (4.8)
4
4795
72
0.250
1/4 (6.4)
3
6410
78

Other slot openings are available upon request.

Standard screen material is 304 Stainless Steel.
316 Stainless Steel, 316L Stainless Steel, Monel
and other materials are available upon request.

Model Information
The WEB Base Unit
Model
Body Material
Size Range
SFA10
Cast Iron
2" - 10"
SFA20
Carbon Steel
1" - 10"
SFA30
Carbon Steel
10" - 36"
The WEB With Spyder Clean
Model
Body Material
Size Range
SFA11
Cast Iron
2" - 10"
SFA31
Carbon Steel
1 1/2" - 36"

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