Thresher Calculation

Given thresher diameter as 2.6 meters revolving at 22 rpm. Calculate the capacity of the thresher :

Knowing Data :
Bulk density of sterilized ffb, b = 0.32 tonne/m3
Thresher rpm = 22
Thresher diameter = 2.6 m
Loading factor, k = 0.05
Forward travel of bunches = 0.5 m

Calculation :

Rate of travel of bunches,
V = 22 x 0.5 m/min = 660 m/hr

Cross sectional area of the material in the thresher,
a = (22/7 x 2.6 x 2.6 / 4) x 0.05 = 0.2656 m3

Thresher capacity, T = a x b x V tonnes / hour
                                  = 0.2656 x 0.32 x 660
                                  = 56 tonnes / hour


Source - MPOB