World Grain - April 2019 - 63

feeder. Ground corn is approximately 45% of either formula.
The corn feeder would need to discharge the amount of corn
needed into the scale in about 45% of the target time, which
would be about 50 seconds. An 18-inch feeder has a capacity
of 108.64 cfh/rpm at two-thirds pitch.
Multiplying this rate by 105 rpm, I got a capacity of 11,407
cfh. Multiplying this by 40 pounds per cubic foot of the corn
and dividing by 3,600 seconds per hour, we get a capacity
of 126.7 pounds per second for the ground corn feeder. The
broiler formula shows 3,119 pounds of ground corn is needed.
Dividing 3,119 pounds by 126.7 pounds per second, the time
to run the feeder is 24.6 seconds. Using this approach, you
select the feeder size, pitch, speed and density to use for each
ingredient to determine the feeder's capacity in pounds per
second.
With this approach, I selected the size of feeder for each ingredient to be used with each feeder capacity as shown in Table 1 (page 62). Determining screwer feed capacities requires
trying several sizes of feeder for the ingredients. Feeders are
volume metering and density affects the volume of ingredient
needed.
Using the feeder capacities per second for each ingredient
from Table 1, the number of seconds needed for each ingredi-

1:50:48 AM

Fred Fairchild is feed science professor emeritus in the Department of Grain
Science at Kansas State University. Prior to coming to Kansas State in 1994,
he worked in the industry designing, constructing and commissioning
numerous mill facilities. He is a licensed professional engineer.
He may be reached by e-mail at fjf@k-state.edu.
We want to hear from you - Send comments and inquiries to
worldgrain@sosland.com. For reprints of WG articles, e-mail reprints@sosland.com.

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ent in a formula may be determined. The sum of these times
should not exceed the target time for that formula. Table 2
(page 62) shows the total feeder running times for each formula. It also shows that the total feeder run time for the
broiler formula is 100.8 seconds, which is less than the target
time of 118 seconds. The swine formula feeders time totaled
required 114.1 seconds. This was slightly over the target time
of 113 seconds. This would be acceptable, as design capacity
for the facility is 75 tph, but the required capacity is 60 tph.
Using this method, Tables 1 and 2 can be developed for each
formula used in a plant. Formulas should be able to be batched
within the target times. Seldom used formulas may exceed the
target times allowed, but the frequently used formulas should
be able to be batched and mixed within the target time calculated for those formulas.

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