The crushed stone output from a 36- by 42-in. jaw crusher, with a closed setting of 4 in., is to be screened into the following sizes:
2
to 1 in., 14 to i in., and less than in.
A three-deck horizontal vibrating screen will be used to separate the three sizes. The stone weighs 115 lblef when crushed.
If the permissible screen efficiency is 90%, determine the minimum-size screen for each deck, expressed in square feet, required to handle the output of the crusher. If the screening unit is 4 ft wide, what will be the nominal screen sizes?