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GrainPro® Cocoon Indoor™ Instruction Manual
MA4044RAD1114-7
5.4.2. Connect the manometer hose into the
flexible inlet of the liner.
5.4.3. Use a vacuum pump [at least 2.3 cubic
meters per minute with 600 Watts (0.80
horsepower) centrifugal pump]:
a) Connect the vacuum pump hose to the
inlet port of the Cocoon Indoor.
b) Create at least -250 Pascal (Pa) or -25
millimeters’ water (mm H
2
O) vacuum.
Doing this can also help engage the
zipper tracks properly as there may be
imperfections during zipping.
c. For a sufficiently airtight set-up, the final pressure should not be greater than one-half (½)
of the initial pressure (created by the vacuum pump) within five (5) minutes.
d. If the PDT test failed, check for holes/tears or poorly sealed zippers then repeat the PDT
procedures.
5.5. PROCEDURE FOR PURGING WITH CARBON DIOXIDE (CO
2
)
5.5.1. Calculation:
a) Total Volume
– Volume Occupied by the Commodity.
b) For every 2.0kg CO
2
, 1 cubic meter of gas is being released.
c) Formula: (1 minus bulk density) x Volume (in m
3
) x 2
COMMODITY
BULK DENSITY, MT/m
3
COMMODITY
BULK DENSITY, MT/m
3
Barley
0.62
Oats
0.43
Cashew nuts
0.50
Paddy
0.60
Chia seeds
0.68
Paddy, rice bran
0.55
Chickpeas
0.74
Peanuts, shelled
0.64
Cocoa beans
0.56
Rice, milled
0.80
Coffee beans
0.59
Rye
0.72
Cotton seed
0.40
Sesame
0.59
Cowpea
0.75
Sorghum
0.72
Maize
0.72
Soybean
0.75
Millet
0.63
Sunflower
0.41
Mung bean
0.75
Wheat
0.77
Example of calculating carbon dioxide dosage for flushing, kg:
10 MT Cocoon Indoor filled with bagged wheat which is approximately 15 m
3
CO
2
dosage for wheat = (1-wheat bulk density) x Volume (in m
3
) x 2
Carbon dioxide needed = (1-0.77) x 15 x 2 =
6.9 kg of CO
2
