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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
| % 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 |
| Deck | Factor "D" |
| Top | 1.00 |
| Second | 0.90 |
| Third | 0.80 |
| 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 |
| 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 Surface Used |
| % Open Area Indicated in Capacity |
| Shape | Factor "H" |
| Square | 1.00 |
| Short Slot (3 to 4 x Width) | 1.15 |
| Long Slot (More than 4 x Width) | 1.20 |
| 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: May 23, 2012 |
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