Flat Bottom Silos

Being aware that high-quality production is only possible by specialized personnel, modern production techniques and full-automated production, OBIAL zinc-plated steel silos and conveyance equipment are designed by the product development/design department to address all grain storage requirements and produced accordingly. High-quality zinc-plated metal sheets used in silo production resist 450 MPA and are corrosion-resistant. The custom produced metal sheets used in the production of our silos have a zinc plating standard of 450 gr/m2 and 350 gr/ m². The zinc plating ratio changes according to customer demands. OBIAL offers difference silo options, including flat and conical-bottom silos, starting from a diameter of 4.51 m diameter to 31.60 m. To be able to carry the vertical loads on the silo, vertical suspension supports mounted on the silo surface are used to yield maximum strength. OBIAL vertical suspension supports perfectly distributes the pressure put by the grain in the silo on the side walls of the silo over the bottom of the silo. To ensure maximum strength at all joints in OBIAL steel silos, Dacromet 500A coated bolts, grade 8,8, are used. To make the silos airtight and waterproof, special sealing elements are used on metal sheets on the silo frame and on the joints of upper roof. There are safe access doors that can be easily opened and closed on the second floors, and observation lids on the roofs of all OBIAL silos. The silo access door has two layers; the outer layer is made up of a single piece of zinc-plated sheet, and the inner layer is made up of two doors placed one on top of the other. If the grain fill-level of the silo has gone up the access door on the silo side wall, the observation lid on the roof allows access into the silo. In all OBIAL silos, there are inner stairways to enter the silo, a safety cage external stairway to access silo observation lid on the outer surface of the silo, and a platform to rest. And there are double-railing and safety roof stairways on the roofs to be able to reach the top point of the silos starting from the eaves. OBIAL silo roofs are among the strongest silo roofs worldwide. OBIAL silo roofs are designed to resist the loads from upper roof conveyance equipment, snow loads, wind loads and the weight of temperature cables. The slope of the 30 degree silo roofs ensures an optimum fill level for the silos. To reinforce the strength and endurance of the upper roofs of wide grain silos, they are designed as cages using special cross-section profiles. The strength of the silo roof is maximized thanks to this architecture. The temperature command system used in OBIAL silos allows us to identify hot spots and insect activities, freeing our customers from reinstalling the grain conditions on the screen. The OBIAL temperature command system consists of temperature cables, temperature sensors installed inside the cables to measure the grain temperature, and portable or stationary temperature screens. There are special steel ropes inside the temperature cables, protecting the cables against elongation. The temperature command system is aligned with the PLC to allow for controlling the grain temperature inside the silos via the PLC screen.


Conical-Bottom Silos

OBIAL conical bottom grain storage steel silos can be used for multiple purposes. Conical bottom steel silos’ conical bottom angles are produced at 45-65 degrees according to the type and flow characteristics of grain to be stored. Conical bottom steel silos can especially be used in animal farms handling storage operations of various types of grains, and in facilities including feed and flour mills. They are also optimum for short-term and temporary grain storage. Side wall sheets, suspension supports and access doors of all OBIAL conical bottom silos are made up of zinc-plated steel sheet. Steel, due to its structural characteristics, is very resistant in conical bottoms. OBIAL offers you conical bottom steel silo options in various sizes and capacities from 2,11 m to 10,83 m.



OBIAL bucket elevators economically carry the grains vertically. The elevator system is designed for grains and is designed for the heaviest working conditions.

All OBIAL elevator systems consist of a column, drive unit cap, a tension unit, and zinc-plated sheet. Buckets used for vertical conveyance of grains are standard plastic, metal or zinc-plated metal buckets specifically produced by OBIAL.

Due to the water tight properties of the motor group (IP 55) located at the cap of the elevator system, it needs no cover. Drive from the motor to the reducer is through a V-belt pulley. The reducer is directly connected to the drive shaft. There are 2 observation lids at the cap of the drive unit, allowing easy Access and maintenance. The inner part of the cap is coated with rubber to make sure the grains are conveyed to the distribütör with no damage. And the cylinder over the cap is rubbercoated to prevent slipping of the belt and skidding.

There are 2 observation lids again for ease of access at the footing of the elevator system and 2 portable lids to make cleaning easier. The tensioning unit made up of zinc-coated sheet tensions the belt, which becomes loose during summer due to weather conditions and extended use, preventing it to perform less effectively. The lower cylinder consists of a steel cage top revent the grains from being conveyed through the grain intakelid and the belt from being released. 


OBIAL chain conveyors are available with capacity rangingfrom 45 up to 500 t/h.

OBIAL chain conveyors transport the grain horizontally orangularly, free of damage and in an economical way.

All OBIAL conveyor chains are extra hardened to operateunder hard working conditions. Grain carrying scraper flights efficientlyreduce the friction between the chain rails and the surface of conveyor box,they are made of plastic derlin material, connected by bolted system andassembled on the conveyor chain rails. Chains move easily inside the conveyorbox on special derlin plastic bobbins which are located inside the conveyor andclosely spaced. The chain conveyor sprockets are made of steel and extra-hardenedby cementation. In comparison with welded conveyors which consist of onecomplete part, the repair, maintenance and assembly of the OBIAL conveyors aremuch easier because of the complete bolted system used.

Specially designed for intake pits, OBIAL chain conveyorshandle the grain free of damage and with high performance.

 Belt Conveyor


Produced from Magnelis sheets, OBIAL multipath distributors are used in distributing the grains and are located under the upper cap of the elevator. Thanks to its insulated structure, it doesn’t permit release of dust. Screw assembly system is used on all joints of the distributor. The flow path of grains may be set as desired using a switch. OBIAL distributors are being produced with a capacity and strength to ensure problem-free operating in high-tonnage filling and discharge systems. The motors and sensors used on the distributor can easily be disassembled and replaced in case of any failure. The distributor frame also houses an observation lid to monitor the flow and to detect and remedy any failure and clogging in the distributor piping.


The lower discharge conveyor helps the grains in the silo to be conveyed out of the silo. Thanks to the lids over the conveyor system and the mechanism commanding these lids, the silo can be safely discharged. The command centre first opens the central lid, not letting other lids to be opened. After the flow from the central lid ends, the other intermediate lids are opened. The conveying system is produced from zinc-plated sheets. The power is directly conveyed from the motor reducer to the drive shaft in the conveyor. This ensures a more efficient and safe operation of the conveyor.

And, OBIAL bottom cleaner conveyor discharges the grains remaining at the bottom of the silo by rotating 360 degrees around itself. The suspension bed system and the steel cage system are made by estimating the grain load falling on them. The drive and motion units are designed individually. This permits the maximum use of bottom cleaning conveyors.

Grain Driers

Working Principle Fan aspirates air into combustion room through shutters and forms a controlled mixture with the gas coming from installation. This mixture is burned by the burner. The heat formed advances along combusTİon room with the help of burner fan and upper aspirating fan and passes through transiTİon channel and is transmitted to air channels of product chamber. Thereby heat is transferred to product and some of heated air is extracted in a controlled manner and remaining heated air enters the system again and is mixed with the atmosphere air received from cooling shutters. Air is irculated along the system in order to reduce its humidity (saturation). Humidity of the product within this loop is reduced to desired humidity ratio and then product asses from unloading mechanism to hopper and exits the system. Grain which is equal to the amount of product leaving the system is added to system with the help of sensors. It is prevented that heat goes toflow pipe through transition connection by means of this adding process. 1.) It has galvanized and thoroughly fixed strong base structure.
General Specifacition
1.) It has galvanized and thoroughly fixed strong base structure.
2.) It allow to work easily under different products and product conditions thanks to grain intake system.
3.) Interior roof and supports ensure that humidifiedgrain passes through chamber as granulated.
4.) Turbulent air circulation is avoided thanks to low static pressure and homogenous heat dissipation.
5.) In emergency situations, machine's burning system is closed thanks to heat sensors.
6.) Temperature values is increased to maximum value from nominal by means of air mixer.
7.) Burners keep temperatures needed fixed continuously.
8.) Burner system consists of Elster Krom Schröder or Dungs brand high-safe devices.
9.) Burner system is worked by using fuels like LPG, LNG (in gas phase) and NG
10.) Grain within chambers is kept under control with emergency unloading covers.
11.) Grain storing chamber is automatic controlled and it controls feeder elevator and provides electric saving.
12.) It keeps the product within chamber without loss thanks to unloading which is made invariable by pneumatic system and desired unloading time is adjusted by means of timing mechanism.
13.) It is ensured that fans are protected from external conditions with the fan shutters fixed by
pneumatic system.
14.) High capacity fans are covered by metal sheets, black sheets and coated with static paint and burners are covered with stainless and galvanized metal sheets. Doors and covers opened into these
sections allow easy intervention.
15.) Heat loss is reduced to minimum thanks to external heat-insulation.
16.) Whole heat flow, air flow and temperature values within the system are reached and adjusted
with the Siemens control panels (PLC).

Rotary Drum Sieve Pre Celener

World population has gradually increased and, as the result of this increase, cultivation areas of grain group which is one of the basic requirements of human have been expanded. As parallel with this expansion the grain group should be stored for short and long term. Since the grain group is not in pure situation within the place stored after harvesting, it should be cleaned from foreing matters i.e. from grass, stones and sands. While screening process made manually in sieves continued day after day in the past, the systems which sieve tons of grain per hour have been developed thanks to state-of- the-art technology nowadays. The name of this unit is pre-cleaning unit. Precleaning consists of 5 main components as of its general strcture: Drum case, drum, upper chamber. It has high resistance against corrosion. 10,9 quality class bolts have been used as fastening element. Bolts ant nuts are dacromate plated and have high yield strength. St 37 quality black sheet has been used for cyclone and its parts have been  joined by means of welding. In order to increase resistance against corrosion, 2 coats of primer have been applied and 1 coat of paint has been applied over primer.

Product which enters hopper placed in upper chamber (aspiratör) through the elavator which is the silo equipment is transported to rotary durm within the main case  While product is flowing into drum, dusts and substances lighter than air within product is drawn by radial fan mounted back of upper chamber and transmitted to cyclone mounted near the radial fan,   It is ensurded that the product flows as horizontal by gving suitable inclination angle to rotary drum so that product sieving process will be carried out in rotary drum and the product is passed out in rotary drum and the product is passed through screens winded around rotary drum.  Intermediate chambers within main case avoid materials which are separated after being passed through screens from  mixing with the others and allow the materials to transfer into conveyor through bottom pouring compartments.

Steel Safety Constructions

There are walkways and rest platforms on all OBIAL silos. The calculations of walkways are made in consideration of the clearance of support legs, load from the chain conveyors on them, wind load, snow load and other moving loads and produced accordingly. Assembled using screws, the modular system can easily be assembled, needing no maintenance since it is zinc plated.

All safety constructions can be custom produced as dyed or zinc-plated. All safety constructions are produced using angle iron and are fully joined using screw-type assembly, without any welding. The safety constructions also come with options including a service platform and stairs.

Ventilation Systems

Ventilation systems built according to the silo capacity andthe characteristic of the grain to be stored are installed into the concreteduring the laying of the foundation concrete. The secanals are coated usingspecially twisted and perforated Magnelis sheets specially designed for theproduct.

OBIAL uses ALFAN branded radial and axial fans in varyingcapacities to ventilate the products stored in the silos of varying sizes andcapacities.

OBIAL ventilation chimneys allow for the easy discharge ofdust formation and pesticides inside the silos. These chimneys are sloped, withwire curtains on their front surfaces. The securtains prevent birds and otherforeign objects from penetrating into the silos. And thanks to its sloped structure,it prevents rain and snow to penetrate.

Where more air outlet is needed, OBIAL produces aventilation fan with a wing diameter of 560 mm. This fan’s air suctiondirection contains a wire curtain, with the air outlet direction having alouvered structure. Louvers open during fan operation, and are designed so thatthey are shut when the fan stops.

 OBIAL also producesportable tunnel ventilation canals strengthened by corrugating and joiningzinc-plated sheets to solve the ventilation problems in horizontal grainstorages.

RF040 2850 RPM d/d 17" 4 7000 152
RF055 19" 5,5 9800 228
RF075 19" 7,5 13000 228
RF110 20" 11 15300 355
RF150 21" 15 18500 355
RF185 21" 18,5 19800 355
RF220 23" 22 20450 406
RF300 23" 30 21300 406


We approach everything we do with sincerity