Grain Systems PNEG-573 - Manual (Page 48)

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APPROXIMATE ALLOWABLE HOLDING TIME APPROXIMATE ALLOWABLE HOLDING TIME APPROXIMATE ALLOWABLE HOLDING TIME APPROXIMATE ALLOWABLE HOLDING TIME APPROXIMATE ALLOWABLE HOLDING TIME
(FOR FIELD, SHELLED CORN TO MAINTAIN GRADE (FOR FIELD, SHELLED CORN TO MAINTAIN GRADE (FOR FIELD, SHELLED CORN TO MAINTAIN GRADE (FOR FIELD, SHELLED CORN TO MAINTAIN GRADE (FOR FIELD, SHELLED CORN TO MAINTAIN GRADE
AT VARIOUS TEMPERATURE AND MOISTURE LEVELS) AT VARIOUS TEMPERATURE AND MOISTURE LEVELS) AT VARIOUS TEMPERATURE AND MOISTURE LEVELS) AT VARIOUS TEMPERATURE AND MOISTURE LEVELS) AT VARIOUS TEMPERATURE AND MOISTURE LEVELS)
Grain Temperature ( Grain Temperature ( Grain Temperature ( Grain Temperature ( Grain Temperature ( °°°°° F) F) F) F) F) Corn Moisture And Amount Of Days Corn Moisture And Amount Of Days Corn Moisture And Amount Of Days Corn Moisture And Amount Of Days Corn Moisture And Amount Of Days
15% 15% 15% 15% 15%
898
451
242
147
109
40 ° F
50 ° F
60 ° F
70 ° F
80 ° F
18% 18% 18% 18% 18%
195
102
63
37
27
20% 20% 20% 20% 20%
85
46
26
13
10
22% 22% 22% 22% 22%
54
28
16
8
6
24% 24% 24% 24% 24%
38
19
10
5
4
26% 26% 26% 26% 26%
28
16
8
4
3
28% 28% 28% 28% 28%
24
13
6.5
3.5
2.5
30% 30% 30% 30% 30%
20
11
5.5
3
2
Drying fronts and/or temperature
fronts move through grain at differ-
ent rates depending on bin size, fan
size, moisture levels and temperature.
The table below lists the ap-
proximate time required to com-
pletely change the temperature of a
bin. Conditions at the time can
cause the length of time to vary
greatly. Therefore this chart should
only be used as a guide.
It may be necessary to run the
fan only part of a day, because of
changing weather conditions. It
would be necessary to run it a few
hours each day on several different
days to complete the temperature
change.
APPROXIMATE HOURS OF FAN OPERATION APPROXIMATE HOURS OF FAN OPERATION APPROXIMATE HOURS OF FAN OPERATION APPROXIMATE HOURS OF FAN OPERATION APPROXIMATE HOURS OF FAN OPERATION
TO CHANGE BIN TEMPERATURE TO CHANGE BIN TEMPERATURE TO CHANGE BIN TEMPERATURE TO CHANGE BIN TEMPERATURE TO CHANGE BIN TEMPERATURE
32 Feet To Eave 32 Feet To Eave 32 Feet To Eave 32 Feet To Eave 32 Feet To Eave
Bin Diameter (22 Feet Tall To Eaves) Bin Diameter (22 Feet Tall To Eaves) Bin Diameter (22 Feet Tall To Eaves) Bin Diameter (22 Feet Tall To Eaves) Bin Diameter (22 Feet Tall To Eaves)
And Hours Of Fan Operation And Hours Of Fan Operation And Hours Of Fan Operation And Hours Of Fan Operation And Hours Of Fan Operation Fan HP Fan HP Fan HP Fan HP Fan HP
1
1.5
3
5-7
7.5-10
10-15
BU*
18 18 18 18 18
73
56
44
38
35
30
4,500
21 21 21 21 21
79
61
51
42
37
32
6,500
24 24 24 24 24
90
65
52
44
41
35
8,500
27 27 27 27 27
NR
66
57
47
42
39
11,000
30 30 30 30 30
NR
76
63
52
45
40
13,500
33 33 33 33 33
NR
82
69
56
49
42
16,500
36 36 36 36 36
NR
92
78
61
53
45
19,500
42 42 42 42 42
NR
NR
93
71
62
54
27,000
48 48 48 48 48
NR
NR
NR
81
71
63
35,500
36 36 36 36 36
NR
NR
NR
79
72
62
28,800
42 42 42 42 42
NR
NR
NR
93
82
70
38,500
48 48 48 48 48
NR
NR
NR
NR
92
80
50,500
*Bushels are rounded and approximate.
NR = Not recommended: Bins in the NR range, may require fan(s) of a different size to get the cool time into the acceptable range.
The hours required are based on clean grain. High moisture grain and grain containing fines or foreign material will require more time to
complete the air change.
Bins requiring more than 100 hours of aeration to totally change the temperature may require continuous aeration at about 1/10th cfm per
bushel or some other acceptable method.
STARTUP & OPERATION FOR ALL PORTABLE DRYERS STARTUP & OPERATION FOR ALL PORTABLE DRYERS STARTUP & OPERATION FOR ALL PORTABLE DRYERS STARTUP & OPERATION FOR ALL PORTABLE DRYERS STARTUP & OPERATION FOR ALL PORTABLE DRYERS