Wet:
Truck or Loader to Crusher
Note 1: Dust suppression system should be activated only during dumping cycle.
Note 2: Airborne dust capture system should also be activated during dumping cycle and may be kept on beyond the dumping
cycle until adequate control of dust is achieved.
104 Dry:
Truck or Loader to Crusher
QE = 33.3 × ( 600 T G )
QE = Exhaust air volume, CFM
T = Weight of material dumped, TPM, tons per minute G = Bulk density of material, pounds/Ft3
Note: The open area at the face of the enclosure should be kept to a
105 minimum.
Wet:
Railroad Rotary Dump to Receiving Hopper
Note 1: Dust suppression system should be activated only during dumping cycle.
Note 2: Airborne dust capture system should be activated during dumping cycle and may be kept on beyond the dumping
106
cycle until adequate control of dust is achieved.
Dry:
Railroad Rotary Dump to Receiving Hopper
QE = 33.3 × ( 600 T )
107 G
QE = Exhaust air volume, CFM
T = Weight of material dumped, TPM, tons per minute G = Bulk density of material, pounds/Ft3
Wet:
Railroad Dump to Conveyor
Dry:
108
Railroad Dump to Conveyor
_____
QE1 = 10 AU1 √ R1S12 D _____
QE2 = 10 AU2 √ R2S22 D
QE1, QE2 = Exhaust air volume, CFM
AU1, AU2 = Enclosure open area at upstream, FT2 R1, R2 = Rate of material flow, TPM
S1, S2 = Height of fall, FT
D = Average material size, FT
Note 1: QE1 and QE2 should be calculated by using appropriate values of AU , R, and S.
Note 2: This equation should be applied where D is greater that 1/8 in.
Wet:
Feeder to:
109
Hammermill Crusher
Cone Crusher Impactor
Dry:
Feeder to:
Hammermill Crusher
110
Cone Crusher Impactor
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Wet:
Feeder to:
111
Bucket Elevator
Belt Conveyor Storage Hopper
Dry:
Feeder to:
Bucket Elevator
Belt Conveyor Storage Hopper
S = S1 + S2 2
112
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Wet:
Feeder to: Screen or Mill
*Not Recommended*
Dry:
Feeder to:
Rotating Screen
113
Vibrating Screen Ball/Rod Mill
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Wet:
Conveyor to:
Cone Crusher Roll Crusher
114
Hammermill Crusher Impactor
Note: Excessive moisture may cause crusher jamming.
Dry:
Conveyor to:
Cone Crusher Roll Crusher
Hammermill Crusher Impactor
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
115
Note: This equation should be applied where D is greater than 1/8 in.
Wet:
Conveyor to:
Bucket Elevator
Belt Conveyor Storage Hopper
Dry:
Conveyor to:
116
Bucket Elevator
Belt Conveyor Storage Hopper
S = S1 + S2 2
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Wet:
Conveyor to: Screen or Mill
117
*Not Recommended*
Dry:
Conveyor to:
Revolving Screen
Vibrating Screen Ball Mill
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
118 Wet:
From: Jaw Crusher From: Roll Crusher
From: Impactor
To: Belt Conveyor
Note: Excessive moisture may cause crusher jamming.
Dry:
From: Jaw Crusher From: Roll Crusher
From: Impactor
To: Belt Conveyor
119
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Wet:
From: Cone Crusher From: Hammermill Crusher
From: Gyratory Crusher
To: Belt Conveyor
Note: Excessive moisture may cause crusher jamming.
120 Dry:
From: Cone Crusher From: Hammermill Crusher
From: Gyratory Crusher
To: Belt Conveyor
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
121 Wet:
Screen to:
Crushers Impactors
Conveyors
Note: Excessive moisture may cause crusher jamming.
122 Dry:
Screen to:
Crushers Impactors
Conveyors
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Note: "AU" depends upon tightness of enclosure at the screen.
123 Wet:
Screen to:
Elevators
Conveyors Hoppers
Note: Excessive moisture may cause crusher jamming.
124 Dry:
Screen to:
Elevators
Conveyors Hoppers
S = S1 + S2 2
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Note: "AU" depends upon tightness of enclosure at the screen.
125 Wet:
Screen to:
Conveyors
Hoppers
Dry:
Screen to:
Conveyors
126
Hoppers
S = S1 + S2 2
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Note: "AU" depends upon tightness of enclosure at the screen.
127 Wet:
Ball/Rod Mill to: Feeder or Screen
*Not Recommended*
Dry:
Ball/Rod Mill to:
Vibrating Feeder
Vibrating Screen
QE
= 200 CFM per square foot of open area
Note: Avoid excessive air velocities at the face of the hood to prevent reentrainment of finely ground material.
128 Wet:
Ball/Rod Mill to:
Bucket Elevator
Belt Conveyor Storage Bin Hopper
Note: Moisture my cause sticking of Material in chutes.
129 Dry:
Ball/Rod Mill to:
Bucket Elevator
Belt Conveyor Storage Bin Hopper
S = S1 + S2 2
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: Avoid excessive air velocities at the face of the hood to prevent reentrainment of finely ground material.
130 Wet:
Elevator to:
Belt Conveyor
Note: Wet systems are not recommended for fine powdery material.
Elevator to: Screens *Not Recommended*
Dry:
Elevator to:
Belt Conveyor
131
Revolving Screen Vibrating Screen
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
Wet:
Elevator to:
Screw Conveyor Storage Bin/Hopper
Note: Wet systems are not recommended for fine powdery material.
132 Dry:
Elevator to:
Screw Conveyor Storage Bin/Hopper
S = S1 + S2 2
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
133 Wet:
Hopper to:
Vibrating Feeder
Belt Conveyor Bucket Elevator
Dry:
Hopper to:
Vibrating Feeder
134
Belt Conveyor
Bucket Elevator
S = S1 + S2 2
_____
QE = 10 × AU × √ RS2 D
QE = Exhaust air volume, CFM
AU = Enclosure open area at upstream, FT2
R = Rate of material flow, TPH
S = Height of fall, FT
D = Average material size, FT
Note: This equation should be applied where D is greater than 1/8 in.
135