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INDUSTRIAL VENTILATION DUST COLLECTION SYSTEM DESIGN

PAINT DIP -SOLVENT VAPOURS

 

PAINT DIP -EXHAUST HOOD LOCATION
Solvent vapors in health hazard concentrations are not always heavier than air.
Exhaust from floor only gives fire proteciton only ;
Ex:
Denisty of air :
1
Denisty of %100 amyl acetate vapor :
4,49
Density of lowest explosive mixture :
1,038
Density of T.L.V (*)mixture :
1.0003
   
* T.L.V The threshold limit value (TLV) of a chemical substance is believed to be a level to which a worker can be exposed day after day for a working lifetime without adverse effects. Strictly speaking, TLV is a reserved term of the American Conference of Governmental Industrial Hygienists (ACGIH).
 
Place hood as close as to the source.Required volume varies with square of distance.Required exhaust air volume varies with square of distance

 

Where ;
Capture Velocity V fpm Air velocity at any point in front of the hood or at the hood opening ,neccesary to capture the contaminated air at that poinby causing it to flow into the hood.
       
Face Velocity Vf fpm Air velocity at the hood opening
       
Slot Velocity Vs fpm Air velocity through the openings in a slot type hood
       
Plenum Velocity Vp fpm Air velocity in the plenum
       
Duct Velocity Vd fpm Air velocity through the duct after hood.
       
Transport Velocity Vt fpm Minumum air velocity through the duct required to move particules in air stream.
       
Dust Distance X ft Distance outward along center axes of hood.
       
Air Flow Q cfm Required minumum air flow to capture dust particles
       
Area A ft2 Area of hood opening
       
Diameter D ft Diameter of round hoods

Dust Exhaust system Hood Entry Losses Table

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