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For problems with accessibility in using figures and illustrations in this document,
please contact the Directorate of Technical Support and Emergency Management at (202) 693-2300.

Wet:

Truck or Loader to Crusher
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.

Dry:

Truck or Loader to Crusher
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 minimum.

Wet:

Railroad Rotary Dump to Receiving Hopper
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 cycle until adequate control of dust is achieved.

Dry:

Railroad Rotary Dump to Recieving Hopper
Railroad Rotary Dump to Receiving Hopper

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

Wet:

Railroad Dump to Conveyor
Railroad Dump to Conveyor

Dry:

Railroad Dump to Conveyor
Railroad Dump to Conveyor

    _____
QE1 =  10 AU  R1S12
D
_____
QE2 =  10 AU  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:
Feeder to: Hammermill Crusher
Hammermill Crusher
 
Cone Crusher Impactor
Cone Crusher Impactor

Dry:

Feeder to:  
Feeder to: Hammermill Crusher
Hammermill Crusher
 
Cone Crusher Impactor
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:
  Bucket Elevator
Feeder to:
Feeder to:
Bucket Elevator
 
Belt Conveyor Storage Hopper
Belt Conveyor Storage Hopper

Dry:

  Bucket Elevator
Feeder to:
Feeder to:
Bucket Elevator
 
Belt Conveyor Storage Hopper
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:

Feeder to: Screen or Mill
Feeder to: Screen or Mill
                                          *Not Recommended*

Dry
:


Feeder to:  
Feeder to: Rotating Screen
Rotating Screen
 
Vibrating Screen Ball/Rod Mill
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:    
Conveyor to: Cone Crusher Roll Crusher
Cone Crusher
 
Roll Crusher
 
  Hammermill Crusher Impactor
Hammermill Crusher Impactor

Note: Excessive moisture may cause crusher jamming.

Dry:

Conveyor to:    
Conveyor to: Cone Crusher Roll Crusher
Cone Crusher
 
Roll Crusher
 
  Hammermill Crusher Impactor
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
 
Note: This equation should be applied where D is greater than 1/8 in.

Wet:
Conveyor to: Bucket Elevator
Conveyor to:
Bucket Elevator
 
Belt Conveyor Storage Hopper
Belt Conveyor Storage Hopper

Dry:

Conveyor to: Bucket Elevator
Conveyor to:
Bucket Elevator
 
Belt Conveyor Storage Hopper
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
Conveyor to: Screen or Mill
                                         *Not Recommended*

Dry
:


Conveyor to: Revolving Screen
Conveyor to:
Revolving Screen
 
Vibrating Screen Ball Mill
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.

Wet:

From: Jaw Crusher From: Roll Crusher
From: Jaw Crusher From: Roll Crusher

From: Impactor
From: Impactor To: Belt Conveyor
To: Belt Conveyor

Note: Excessive moisture may cause crusher jamming.

Dry:

From: Jaw Crusher From: Roll Crusher
From: Jaw Crusher From: Roll Crusher

From: Impactor
From: Impactor To: Belt Conveyor
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.

Wet:

From: Cone Crusher From: Hammermill Crusher
From: Cone Crusher From: Hammermill Crusher

From: Gyratory Crusher
From: Gyratory Crusher To: Belt Conveyor
To: Belt Conveyor

Note: Excessive moisture may cause crusher jamming.

Dry:

From: Cone Crusher From: Hammermill Crusher
From: Cone Crusher From: Hammermill Crusher

From: Gyratory Crusher
From: Gyratory Crusher To: Belt Conveyor
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.

Wet:

 Screen to: Crushers Impactors
Screen to:
Crushers
 
Impactors
 
Conveyors    
Conveyors

Note: Excessive moisture may cause crusher jamming.

Dry:

            Screen to:    
Screen to: Crushers Impactors
Crushers
 
Impactors
 
Conveyors    
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.

Wet:
    Screen to: Elevators
Screen to:
Elevators
 
Conveyors Hoppers
Conveyors Hoppers

Note: Excessive moisture may cause crusher jamming.

Dry:

 Screen to: Elevators
Screen to:
Elevators
 
Conveyors Hoppers
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.

Wet:

Screen to:  
Screen to: Conveyors
Conveyors
 
  Hoppers
Hoppers

Dry:

Screen to:  
Screen to: Conveyors
Conveyors
 
Hoppers
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.

Wet:

Ball/Rod Mill to: Feeder or Screen
Ball/Rod Mill to: Feeder or Screen
                                                    *Not Recommended*

Dry
:


Ball/Rod Mill to:  
Ball/Rod Mill to: Vibrating Feeder
Vibrating Feeder
 
  Vibrating Screen
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.

Wet:

Ball/Rod Mill to: Bucket Elevator
Ball/Rod Mill to:
Bucket Elevator
 
Belt Conveyor Storage Bin Hopper
Belt Conveyor Storage Bin Hopper

Note: Moisture my cause sticking of Material in chutes.

Dry:

Ball/Rod Mill to:  
Ball/Rod Mill to: Bucket Elevator
Bucket Elevator
 
Belt Conveyor Storage Bin Hopper
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.

Wet:

Elevator to:  
Elevator to: Belt Conveyor
Belt Conveyor

Note: Wet systems are not recommended for fine powdery material.

Elevator to: Screens         *Not Recommended*

Dry
:


Elevator to:  
Elevator to: Belt Conveyor
  Belt Conveyor
 
Revolving Screen Vibrating Screen
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:    
Elevator to: Screw Conveyors Storage Bin/Hopper
Screw Conveyor Storage Bin/Hopper

Note: Wet systems are not recommended for fine powdery material.

Dry:

Elevator to:    
Elevator to: Screw Conveyor Storage Bin/Hopper
  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.

Wet:

Hopper to:  
Hopper to: Vibrating Feeder
Vibrating Feeder
 
Belt Conveyor Bucket Elevator
Belt Conveyor Bucket Elevator

Dry:

Hopper to:  
Hopper to: Vibrating Feeder
  Vibrating Feeder
 
Belt Conveyor Bucket Elevator
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.