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TopDry Systems
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Features:

  • Cooling components consist of aeration fan, transition, perforated floor and floor supports.

  • Hoppers and dump chutes are strategically spaced in the drying chamber floor.

  • TopDry fills and dumps using gravity rather than belts and augers, keeping maintenance costs to a minimum.

  • Upper floor beams are pre-assembled with welded end clips to speed up construction and form a box structure which provides solid floor support.

  • Alternating right and left "C"-section rafters provide a more structurally stable drying floor.

  • The perimeter "C" channel takes downward forces from the rafters and transfers the load to the wall brackets. The wall brackets then transmit the load to the stiffeners, which set directly on the foundation.

  • Perforated eave flashing around the outer edge of the upper floor improves airflow in this critical area and promotes all the grain leaving the drying chamber, reducing cleanout effort and promoting a longer floor and bin sidewall life.

  • Wide ribbed floor sheets set down over the rafters and attach with self-tapping screws for a strong steel-to-steel connection and reduced erection time. Floor sheets come in two perforation sizes to fit various grain types.

  • TopDry grain temperature sensors are used to measure grain temperature throughout the upper chamber.

  • A rugged roll-formed center collar helps to stabilize the structure, and together with the lift plate, cable and chain configuration, is a simple, but effective means of controlling grain discharge from the drying chamber.

  • Industrial rotary switches mounted in the bin wall or on the roof give indication of drying and storage chamber levels allowing the AutoFlow’s automatic operation and stop either model if the storage chamber becomes full. On a Batch TopDry a horn is provided to signal the operator to stop the loading of wet grain into the drying chamber.

  • Flattop 3 vent assembly mounts like a traditional Flatop providing a strong base for downspout support while allowing physical access and full vent opening with the peak closed to weather.

  • GSI fabricates all roofs out of prime, high tensile, G-90 galvanized steel. TopDry roofs can support up to 6,000 lbs. on the center peak of the bin. Roof ribs are fully double lapped for weather protection and have four reinforced areas on each rib for increased strength and rigidity. For added water protection all roof vent panels are prepunched at the factory with a tall extruded lip, and used in conjunction with our vent gaskets, provide an unbeatable weather seal.

  • Leveling bands are mounted at key locations in the drying chamber. These bands work in conjunction with gravity and TopDry’s steep 30 degree drying floor design (corresponding with the angle of repose of grain.) to achieve an even layer of grain depth.

  • Leveling band posts have an integral base for convenient assembly with a rigid, single bolt connection.

  • TopDry air diffusers are a simple, but effective means of distributing airflow evenly throughout the plenum.

  • Duckwork mounting allows the Fan and Heaters to be located at ground level. This makes operation and maintenance much easier as well as insuring that heat mix will be near perfect before it enters the drying chamber. On Batch Models this may eliminate the need for a remote control station.

  • GSI has several fan and heater size offerings in both single and three phase to allow for many options on drying capacity and potential future expansion.

  • Related Products
    and Accessories:

    Bin Flooring

    Farm Bins

    Fans and Heaters



    > Home > Farm > Drying & Conditioning > TopDry System

    TopDry System

    TopDry System

    TopDry is basically a dryer located in the top of a grain bin. A layer of grain in the overhead drying chamber is dried by a large fan and heater then dumped to a holding area below. A smaller aeration fan below captures heat from this previously dried grain, and pushes it upward to help dry the next load. This recycling of heat increases efficiency, which greatly reduces drying costs.

    All heat drying while cooling in a cooling bin has proven to be one of the most efficient ways to dry grain. With the GSI TopDry System, we go one step further by capturing the heat normally blown out the top of the cooling bin and reuse it in the drying process. In addition, TopDry allows filling, drying and dumping operations to be run automatically in the AutoFlow models. TopDry is also a storage bin providing up to 30,000 bushels of storage. One complete package that saves time and money!

    TopDry's all have large volumes of grain in process with low airflow rates compared to other drying systems. This allows for gentler handling that with additional management can even make the drying of Food Grade grain possible. Diversity, flexibility and field proven controls make TopDry a reliable and convenient solution for grain drying and storage.

    Adjustable Cooling Floor    Download TopDry Animation video


    Batch TopDry

    BATCH - One or two fan(s) and Heater(s) force hot air through an even layer of wet grain in the drying chamber directly or through ductwork.

    Autoflow TopDry

    AUTOFLOW - One or two fan(s) and Heater(s) force hot air through varied depth layers of wet grain in the drying chamber directly or through ductwork.

    Batch TopDry

    BATCH - Outside air from the cooling fan captures heat from previously dried grain and that heat and aeration air is used to help dry the next batch.

    Autoflow TopDry

    AUTOFLOW - Outside air from the cooling fan captures heat from previously dried gain and is then reused in the continuing drying process.

    Batch TopDry

    BATCH - When the column of grain above has dried to a predetermined temperature the fan(s) & heater(s) stop and the operator manually opens the dump chutes letting the hot dried grain fall into the cooling and storage area below. The drying chamber is then manually refilled and the operator can start the next batch drying.

    Autoflow TopDry

    AUTOFLOW - When the grain above has dried to a predetermined temperature the actuator opens the dump chutes automatically letting 1/4 of the hot dried grain in a 36’, or 1/3 in the 24’ or 30’ fall into the cooling and storage area below. The drying chamber is then automatically refilled and the drying process continues without interruption until the wet grain supply is empty.


    Autoflow Control System

    Autoflow Control System
    The Autoflow control system is exclusive to the Maxim TopDry and is available on all the diameters. Autoflow features include an easy to read, backlit LCD display, automatic shutdown when out of grain, the ability to run continuous flow, or batch dry and cool. It has plenum hi-temperature protection, auger fill delay, and automatic or adjustable staged starting of fans and heaters. It monitors fan and heater conditions (8 total), indicating what caused the malfunction, can control 2 separate load augers and automatically closes the chutes in the event of a power loss. Autoflow includes four sensors for grain moisture averaging (more sensors = better accuracy), motor starters for fill systems, batch counter, reliable rotary fill switches (power paks mounted externally on the bin for easy service), and has a 25 memory recall to keep track of unit shut down times and dates. Autoflow is totally microprocessor based (no moving parts), and is completely driven by software which is easily upgraded. Dump chutes are controlled with an industrial strength 24 volt screw-type actuator.

    All control boxes are galvanized, with the main control box powder coat over galvanized, featuring heavy duty sealed doors with UV resistant Plexiglas windows for easy viewing and to protect the displays and electrical circuitry.

    Another Autoflow feature allows control boxes to be installed in a separate location from the drying bin with just a few wires. This can help prevent dryer controls from being tampered with or vandalized.


    Batch Control

    Hand Crank

    Batch Control System
    The optional Series 2000 manual control center is available for use with the Series 2000 fan and heater units. This control center offers control of dry time, cool time and grain temperature (moisture).

    An Important feature of this control center is the ability to set plenum temperature and other settings remotely from the fan(s) from a more convenient location.

    Batch TopDrys include four sensors for grain averaging (more sensors = better accuracy).

    Hand Crank
    On Batch TopDrys, a simple and dependable cable winch is used to dump each batch. Lower the chutes for a minute or two until the drying chamber is empty and immediately refill and continue drying.


    Fans and Heaters

    TopDry Fans and Heaters
    TopDry’s Series 2000 fan and heater combination is taking grain conditioning into the next century with computerized components that allow the operator better control and access to vital information. The TopDry specially designed heaters feature backlit LCD displays for night viewing, providing constant read-outs of plenum temperature, grain temperature, or drying time. Drying can be controlled manually by Time or automatically by temperature based moisture control. Built-in flame detection circuitry notifies the operator of emergency situations and shuts down the dryer in the event of a dryer malfunction. TopDry fans utilize a high efficiency, light weight, composite blade for reduced motor stress at startup. A clear view panel on the side of the housing provides easy access to the burner for ignitor and flame probe adjustment or burner disassembly for cleaning and inspection. Vinyl fan covers are standard to completely enclose fan openings preventing weather or other unwanted material from entering the bin. TopDry fans and heaters are available in 36" dia. (15 HP) up through 42" (40 HP). All single phase TopDry fans have single rotation motors to prevent the fan from rotating backwards.

    Built-in Thermostat

    Built-in Thermostat
    GSI 2000 series fans and heaters offer a built in thermostat for plenum and grain temperature, with the plenum and grain temperature, with the plenum thermostat differential being adjustable and programmable from the ground. The sensor is mounted in a weather proof "UL" approved housing, impervious to weather, rodents and insects.


    Built-in Thermostat
    1750 RPM Centrifugal Fan

    Built-in Thermostat
    Inline Centrifugal Fan

    Aeration Fans
    Before storing, grain must be dried down to the proper moisture level. The grain must then be cooled and then maintained through aeration for long term storage. The TopDry's design allows this aeration air to also be used as additional drying air while reusing all the heat removed from the dried grain. The aeration fan will be working against the static pressure of both the stored grain and drying fan(s). It is important that the airflow remain even no matter how much grain is in the storage chamber so GSI uses only Centrifugal Fans for aeration. Both Inline and 1750 RPM Centrifugal fans can be used depending on the size of the system and the aeration rate desired.

    GSI's 1750 RPM centrifugal fans are built with a heavy galvanized steel, scroll-type housing and inverted inlet venturi. A non-overloading backward-inclined airfoil wheel provides high airflow with a long motor life. These fans operate at a greatly reduced noise level and are perfect for the larger TopDry models where efficient delivery of large volumes of aeration air is needed and or the quietest operation is desired. To assure adequate static pressure capability models between 10 hp and 20 hp will work best for use with a TopDry.

    GSI's Inline Centrifugal fan operate at 3500 RPM and are the most economical choices for all but the largest TopDry installations. These fans operate much quieter than a traditional axial bladed fan, but not as quiet as a 1750 RPM Centrifugal fan. Inline Centrifugal fans are very good at providing the same amount of air across a wide range of static pressures.


    Ventilation
    A large 30 inch diameter peak opening allows for easy filling. GSI’s hingeless, galvanized cap slides on rods to open and close and is held securely closed with a spring loaded latch. Peak ring flashing tabs between roof ribs help further seal the roof.

    Auto Vent
    Flatop 3 Vent

    The Flatop 3 Vent assembly mounts like a traditional Flatop providing a strong base for downspout support while allowing physical access and full vent opening with the peak closed to weather.

    In the event that the peak cap must be closed and the Flattop 3 Vent assembly cannot be used, high mount roof vents may be used as an alternative.

    Auto Vent
    Auto-Vent

    The Auto-Vent is a revolutionary concept in vent design eliminating any restriction from a screen or grill and reducing the chance of air restriction due to trash build up or frost. When fans are running, air passes freely above and below a special wing-shaped damper, allowing it to pivot open and float in mid-air. The damper drops down and closes when the fan is not in operation, also blocking wind, snow, birds, etc. from entering. Auto-Vents are assembled with a heavy duty lock seam and attach to prepunched roof panels which have a tall extruded lip detouring moisture around the vent and down the roof panel. For additional protection, a special die-cut gasket is placed between the vent and roof panels to further seal against water penetration.


    Access Door

    Bin Ladders

    Round Door

    TopDry Bin Access
    Easy access walk-in door. All inner door panels on GSI’s walk through door open completely with no horizontal bars or braces to unbolt or remove. Specially designed lever latches multiply the inner door opening force by 20 times to counteract friction set from grain loads, requiring no use of wrenches or tools. The outer door cover swings completely open with the door cover hold-back and closes tight with the use of an exclusive weather seal. Other features include a probe opening for easy grain inspection and factory caulked door frames reducing installation time.

    Large One-Ring Door
    All TopDrys feature a large one ring access door in the second ring from the top. The door offers access for monitoring grain stored in the TopDry bin. The door is shipped completely pre-assembled for ease of construction. Large platforms provide a stable work area for monitoring or servicing the crop dryer units.

    Sturdy Platforms and Sidewall Ladders
    GSI platforms provide a large, stable work area for monitoring or servicing the crop dryer units. Sturdy sidewall ladders are available for easy access to and from the bin roof or inspection platforms. Ladder sections are die formed from a single piece of galvanized steel to provide strength, stability, and quick assembly. Sections come in 22" or 44" lengths.


    Round Door

    High Tensile Sidewall
    The 4" wide corrugated sidewall design is standard on the GSI TopDry. These 44” tall sheets are constructed using high tensile steel with 65,000 PSI minimum strength. All sidewalls feature G-90 bright spangle galvanized coating to ensure a long tank life. GSI also uses graded, zinc plated, high strength, dichromate coated bolts at all connections. Each bolt has a special sealing washer to keep out the elements.

    Sidewall Strength with Stiffeners
    TopDry utilizes strong vertical stiffener columns to carry the vertical load of the bin and system to the foundation. Stiffeners are manufactured from high strength 65,000 PSI (450 MSA) steel. The stiffeners are mounted on the outside of the tank to allow you unimpeded grain flow inside and feature strong splice joints and a large cross sectional area for increased strength.

    TopDry stiffeners are fitted with heavy base plates which bolt directly to the concrete. These plates give the stiffeners a larger load bearing area to transfer the load to the foundation and anchor the bin securely.


    Specifications

    BATCH SERIES - SHELLED CORN    
    Batch Series
    24' Dia.
    One Fan
    30' Dia.
    One Fan
    30' Dia.
    Two Fan
    36' Dia.
    One Fan
    36' Dia.
    Two Fan
    Fan and Heater Unit(s)
    Plenum Temp.
    Moisture Content Wet Basis
    BPH
    Batch Time Hours
    BPH
    Batch Time Hours
    BPH
    Batch Time Hours
    BPH
    Batch Time Hours
    BPH
    Batch Time Hours
    15 H.P.
    36" Fan
    3.5 mil. BTU
    140° F
    20%
    398
    2.5
    461
    3.3
    728
    1.9
    521
    4.1
    841
    2.6
    25%
    252
    3.8
    292
    5.1
    461
    3.3
    330
    6.5
    533
    4.0
    30%
    157
    6.1
    182
    8.2
    288
    5.2
    206
    10.4
    333
    6.5
    160° F
    20%
    474
    2.0
    550
    2.8
    869
    1.8
    622
    3.4
    1004
    2.1
    25%
    300
    3.2
    348
    4.4
    550
    2.7
    394
    5.4
    636
    3.4
    30%
    178
    5.2
    218
    6.8
    344
    4.4
    246
    8.7
    397
    5.4
    180° F
    20%
    607
    1.6
    677*
    2.4*
    1112
    1.4
    694*
    3.4*
    1284
    1.6
    25%
    384
    2.6
    429*
    3.7*
    704
    2.1
    440*
    5.2*
    814
    2.7
    30%
    240
    4.0
    268*
    6.0*
    440
    3.4
    274*
    8.3*
    508
    4.2
    15 H.P.
    40" Fan
    6.25 mil. BTU
    140° F
    20%
    486
    2.0
    562
    2.7
    650
    3.3
    1022
    2.1
    25%
    308
    3.1
    356
    4.2
    411
    5.2
    647
    3.3
    30%
    192
    4.9
    222
    6.7
    257
    8.4
    404
    5.3
    160° F
    20%
    580
    1.6
    670
    2.2
    775
    2.8
    1219
    1.8
    25%
    367
    2.6
    425
    3.5
    491
    4.4
    772
    2.8
    30%
    230
    4.2
    265
    5.6
    306
    7.1
    482
    4.5
    180° F
    20%
    742
    1.3
    858
    1.8
    890*
    2.6*
    1560
    1.4
    25%
    470
    2.0
    543
    2.7
    564*
    4.1*
    988
    2.2
    30%
    294
    3.3
    339
    4.4
    352*
    6.5*
    617
    3.5

    30 H.P.
    42" Fan
    10.25 mil. BTU

    140° F
    20%
    638
    2.4
    717
    2.9
    1142
    1.9
    25%
    405
    3.6
    454
    4.7
    723
    2.9
    30%
    253
    5.9
    284
    7.5
    452
    4.7
    160° F
    20%
    762
    2.0
    856
    2.5
    1363
    1.5
    25%
    482
    3.1
    542
    4.0
    863
    2.5
    30%
    302
    4.9
    338
    6.4
    539
    4.0
    180° F
    20%
    975
    1.5
    1095
    2.0
    1744
    1.3
    25%
    618
    2.4
    694
    3.1
    1105
    2.0
    30%
    386
    3.9
    433
    4.9
    690
    3.2
    40 H.P.
    42" Fan
    10.25 mil. BTU
    140° F
    20%
    726
    2.1
    810
    2.7
    25%
    460
    3.3
    513
    4.2
    30%
    287
    5.2
    320
    6.7
    160° F
    20%
    867
    1.8
    966
    2.2
    25%
    549
    2.7
    612
    3.5
    30%
    343
    4.4
    382
    5.6
    180° F
    20%
    1110
    1.4
    1263
    1.8
    25%
    702
    2.1
    783
    2.7
    30%
    439
    3.4
    489
    4.4

    *Insufficent burner BTUs for 45 deg. ambient temp.
    Batch capacities exclude loading time. Final moisture 15% after complete cooling.
    Estimated at 45 deg. F. ambient temperature, 65% relative humidity. 1/3 CFM/Bu. Cooling Rate.
    Use only as a guide, grain densities and weather conditions will vary capacities.

     

    AUTOFLOW SERIES - SHELLED CORN    
    Batch Series
    24' Dia.
    One Fan
    30' Dia.
    One Fan
    30' Dia.
    Two Fan
    36' Dia.
    One Fan
    36' Dia.
    Two Fan
    Fan and Heater Unit(s)
    Plenum Temp.
    Moisture Content Wet Basis
    BPH
    Batch Time Hours
    BPH
    Batch Time Hours
    BPH
    Batch Time Hours
    BPH
    Batch Time Hours
    BPH
    Batch Time Hours
    15 H.P.
    36" Fan
    3.5 mil. BTU
    160° F
    20%
    528
    21.6
    557
    31.9
    939
    18.9
    993
    25.8
    25%
    334
    34.1
    353
    50.4
    595
    29.9
    629
    40.7
    30%
    209
    54.6
    220
    80.8
    371
    47.9
    393
    65.2
    180° F
    20%
    675*
    16.8*
    713*
    24.9*
    1202
    14.8
    1271
    20.1
    25%
    428*
    26.6*
    451*
    39.4*
    761
    23.4
    805
    31.8
    30%
    267*
    42.6*
    282*
    63.1*
    475
    37.4
    503
    51.0
    200° F
    20%
    791*
    14.4*
    835*
    21.3*
    1407*
    12.6*
    1488*
    17.2*
    25%
    501*
    22.7*
    529*
    33.6*
    891*
    19.9*
    943*
    27.2*
    30%
    313*
    36.4*
    330*
    53.9*
    557*
    32.0*
    589*
    43.5*
    15 H.P.
    40" Fan
    6.25 mil. BTU
    160° F
    20%
    648
    17.5
    711
    25.0
    1154
    15.4
    1269
    20.2
    25%
    411
    27.7
    450
    39.5
    731
    24.3
    803
    31.9
    30%
    256
    44.4
    281
    63.3
    457
    39.0
    502
    51.1
    180° F
    20%
    830*
    13.7*
    909*
    19.5*
    1477
    12.0
    1623
    15.8
    25%
    525*
    21.6*
    576*
    30.9*
    936
    19.0
    1028
    24.9
    30%
    328*
    34.7*
    360*
    49.5*
    584
    30.4
    642
    39.9
    200° F
    20%
    971*
    11.7*
    1065*
    16.7*
    1730*
    10.2*
    1901
    13.4*
    25%
    615*
    18.5*
    674*
    26.4*
    1096*
    16.2*
    1204
    21.3*
    30%
    384*
    29.6*
    421*
    42.2*
    684*
    26.0*
    752
    34.1*

    30 H.P.
    42" Fan
    10.25 mil. BTU

    160° F
    20%
    740
    15.4
    806
    22.0
    819
    31.3
    1452
    17.6
    25%
    469
    24.3
    511
    34.8
    519
    49.4
    920
    27.8
    30%
    293
    38.9
    319
    55.8
    324
    79.1
    574
    44.6
    180° F
    20%
    947
    12.0
    1032
    17.2
    1048
    24.4
    1858
    13.8
    25%
    600
    19.0
    653
    27.2
    664
    38.6
    1177
    21.7
    30%
    375
    30.4
    408
    43.6
    415
    61.8
    735
    34.8
    200° F
    20%
    1109
    10.2
    1208
    14.7
    1227
    20.8
    2176
    11.7
    25%
    702
    16.2
    765
    23.2
    777
    32.9
    1378
    18.6
    30%
    439
    25.9
    478
    37.2
    486
    52.8
    861
    29.8
    40 H.P.
    42" Fan
    10.25 mil. BTU
    160° F
    20%
    920
    19.3
    950
    26.9
    25%
    583
    30.5
    602
    42.6
    30%
    364
    48.9
    376
    68.2
    180° F
    20%
    1178
    15.1
    1216
    21.0
    25%
    746
    23.8
    770
    33.3
    30%
    466
    38.2
    481
    53.3
    200° F
    20%
    1379
    12.9
    1424
    18.0
    25%
    873
    20.3
    902
    28.4
    30%
    545
    32.6
    563
    45.5

    *Insufficent burner BTUs for 45 deg. ambient temp.
    Batch capacities exclude loading time. Final moisture 15% after complete cooling.
    Estimated at 45 deg. F. ambient temperature, 65% relative humidity. 1/3 CFM/Bu. Cooling Rate.
    Use only as a guide, grain densities and weather conditions will vary capacities.

     

    STORAGE CAPACITIES    
    Batch
    Autoflow
    Maximum Storage (BU)
    Bin Diameter
    Batch Size (BU)
    Grain in Process (BU)
    Dump Size (BU)
    Rings
    Eave Height
    Peak Height
    Batch
    Autoflow
    24'
    1,000
    560
    187
    5
    18'5"
    25'0"
    4,813
    4,373
    6
    22'1"
    28'8"
    6,198
    5,758
    7
    25'9"
    32'4"
    7,583
    7,143
    8
    29'5"
    36'0"
    8,968
    8,528
    9
    33'1"
    39'8"
    10,353
    9,913
    10
    36'9"
    43'4"
    11,738
    11,298
    30'
    1,500
    845
    282
    5
    18'5"
    26'9"
    7,459
    6,804
    6
    22'1"
    30'5"
    9,623
    8,968
    7
    25'9"
    34'1"
    11,787
    11,132
    8
    29'5"
    37'9"
    13,951
    13,296
    9
    33'1"
    41'5"
    16,115
    15,460
    10
    36'9"
    45'1"
    18,279
    17,624
    11
    40'5"
    48'9"
    20,443
    19,788
    36'
    2,160
    1,215
    303
    6
    22'1"
    32'6"
    13,859
    12,914
    7
    25'9"
    36'2"
    16,974
    16,029
    8
    29'5"
    39'10"
    20,089
    19,144
    9
    33'1"
    43'6"
    23,204
    22,259
    10
    36'9"
    47'2"
    26,319
    25,374
    11
    40'5"
    50'10"
    29,434
    28,489

    Maximum storage estimated with 12" aeration floor, level to bottom of fan entrance, with upper batch filled