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Factor "A" Basic Capacity

Screen Surface Square Opening % of Open Area STPH Passing Per Sq
4" 75% 7.69
3-1/2" 77% 7.03
3" 74% 6.17
2-3/4" 74% 5.85
2-1/2" 72% 5.52
2" 71% 4.90
1-3/4" 68% 4.51
1-1/2" 69% 4.20
1-1/4" 66% 3.89
1" 64% 3.56
7/8" 63% 3.38
3/4" 61% 3.08
5/8" 59% 2.82
1/2" 54% 2.47
3/8" 51% 2.08
1/4" 46% 1.60
3/16" 45% 1.27
1/8" 40% 0.95
3/32" 45% 0.76
1/16" 37% 0.58
1/32" 41% 0.39

Factor "B"

Percent of Oversize Material in Feed to Deck

% Oversize Factor "B"
5% 1.21
10% 1.13
15% 1.08
20% 1.02
25% 1.00
30% 0.96
35% 0.92
40% 0.88
45% 0.84
50% 0.79
55% 0.75
60% 0.70
65% 0.66
70% 0.62
75% 0.58
80% 0.53
85% 0.50
90% 0.46
95% 0.33

Factor "C"

Percent of Halfsize Material in Feed to Deck

% Halfsize Factor "C"
0% 0.40
5% 0.45
10% 0.50
15% 0.55
20% 0.60
25% 0.70
30% 0.80
35% 0.90
40% 1.00
45% 1.10
50% 1.20
55% 1.30
60% 1.40
65% 1.55
70% 1.70
75% 1.85
80% 2.00
85% 2.20
90% 2.40

Factor "D"

Screen Location on Deck

Deck Factor "D"
Top 1.00
Second 0.90
Third 0.80

Factor "E"

Wet Screening

Opening Factor "E"
1/32" 1.00
1/16" 1.25
1/8" 2.00
3/16" 2.50
1/4" 2.00
3/8" 1.75
1/2" 1.40
3/4" 1.30
1" 1.25

Factor "F"

Material Weight

Lbs./cu. ft. Factor "F"
150 1.50
125 1.25
100 1.00
90 0.90
80 0.80
75 0.75
70 0.70
60 0.60
50 0.50
40 0.40
30 0.30

Factor "G"

Open Area of Screen Surface

Factor "G" =   % Open Area of Surface Used

  % Open Area Indicated in Capacity

 


Factor "H"

Shape of Screen Surface Opening

Shape Factor "H"
Square 1.00
Short Slot (3 to 4 x Width) 1.15
Long Slot (More than 4 x Width) 1.20

Factor "J"

Efficiency

Objective Factor "J"
95% 1.00
90% 1.15
85% 1.35
80% 1.50
75% 1.70
70% 1.90

 

    
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Last modified: August 30, 2016