Metal Silo/

Corrugated Steel Flat Bottom Silo

Item Flat bottom silo
Diameter 5.5m-32m
Cylindrical Height 5.65m-31.42m
Roof Height 1.28m-9.22m
Capacity 144m3 (4,086 bu)-26063m3 (739,605 bu)
Wall Type Corrugated steel
Material Hot-dip galvanized steel sheet
Bottom Type Flat

  • Product Detail
  • Inquiry

Corrugated Steel Flat Bottom Silo

SiroSilo Industrial mainly promotes corrugated steel silo.


Corrugated steel silo is a kind of metal silo assembled by connecting corrugated sheets with high-strength bolts, the corrugated sheet is a kind of sheet made by mechanical rolling, molding, and punching.

When using high-strength bolts to connect such corrugated plates, an electric torque wrench is required.


Corrugated grain bins can be customized for different grain/seed types, silo diameter, and silo capacity.

This type of steel farm silo is mainly used to store granular grains & seeds, such as wheat, corn, rice, poly grain, barley, sunflower seeds, etc., and is widely used in the agricultural industry.

Corrugated sheets are generally composed of galvanized high-elastic S350GD steel.


The galvanized layer thickness is usually 0.8mm-4.2mm, the maximum coating thickness can reach 600g/m2, and the maximum wall thickness can reach 8.4mm.

Most of the corrugated sheet production adopts the rolling process, mass production is carried out by corrugated steel sheet making machine, such machine can automatically manufacture various sizes of corrugated plates.


The advantages of the rolling process are:

  • The wave shape is formed successively;
  • The internal stress is eliminated;
  • The resilience is small.

Thus, the corrugated steel sheet’s quality is very good.


Even if the raw material is thicker steel plate, it can be formed in sequence at one time on the corrugated steel sheet making machine.

In addition, the sheet making machine can work together with unwinder, leveler, rollgang, fixed-length hydraulic shear machine, and other equipment, directly convert the coiled steel plate into the corrugated sheet.


The following video can assist you better understand the corrugated steel sheet production process.

According to the silo bottom types, there are 2 main types of corrugated steel metal grain bin:

  • Flat bottom steel silo
  • Hopper steel silo

If your grain reserves are relatively small, less than 1500 tons, you can consider purchasing hopper silo, because this kind of steel silo is convenient for unloading & does not need clearance equipment, the price is advantageous;


If your grain reserves are greater than 1,500 tons, or even tens of thousands of tons, then you’d better buying a flat bottom steel silo.

Because the large-capacity flat bottom silo has floor support, it doesn’t need a bottom support structure like hopper silo, and the cost is lower than that of hopper silo.

The flat bottom steel silo has the following advantages:

  • Reasonable structure, safe & reliable, long service life.

The cylindrical body is a combined structure of keel & corrugated steel plate, such structure has high overall strength, good stability, no deformation in use.


The wall is made of hot-dip galvanized coils, the silo roof is all processed by galvanizing, which has strong corrosion resistance & long service life.

  • Complete auxiliary equipment & advanced technology.

Automatic temperature measurement system, real-time monitoring of the temperature in the bin;

Ventilation system can effectively prevent food mildew;

The level sensing system prompts the full/empty state of the material in the silo timely, realizes automatic display & control.





And it cooperates with the conveying & grain bin cleaning equipment to realize the automatic material loading & unloading.

  • Various specifications are available for your choice, which can be customized according to your needs.

SiroSilo corrugated steel grain bins range in diameter from 5.5m to 32m, with a maximum storage capacity of 26,063 cubic meters.

The silo bin bottom has 2 types for choice, flat bottom & cone bottom, a total of more than 200 bin types for you to choose from.

  • One-stop solution & industry-leading after-sales service.

SiroSilo has the ability to provide the one-stop service of silo bin design, manufacturing, sales, and after-sales.


The corrugated steel flat bottom silo has been successfully exported to the United States, Russia, Germany, Brazil, Thailand, India, and other countries, China’s largest grain, oil, and food company COFCO is also our customer.


In order to help you understand the flat bottom steel silo more comprehensively, we divide our SiroSilo poly grain bin into 4 parts to explain in detail one by one.

SiroSilo corrugated grain bin mainly includes the following 4 parts:

  • Bottom

This part contains:

Air fan
Sweep augers
Aeration gutters system
  • Body/cylinder

The sidewall body is composed of high-strength corrugated galvanized sheet, the junction position is connected by high-strength (8.8) bolts, and the Butyl rubber compound is applied for sealing, thus the silo strength & the rainproof effect could be guaranteed.



This part contains:

Ladder to access door
Reinforced ring (wind ring)
Access door
Grain bin bolts
Sealing tape (Butyl rubber compound)
  • Roof/top

The C-shaped rafters & beams significantly improve the roof integrity, such design is very suitable for the shape of silo roof, eliminates the common deflection of Z-shaped rafters.


The roof vent cover is made of hot-dip galvanized steel, its unique structure ensures that the silo is not affected by rain.

This section also contains:

Pneumatic charging hole
Inspection door
Roof steps
  • Control system

This section contains:

Automatic temperature measurement system (include grain bin moisture sensors)
Ventilation/aeration system
Material level system (grain bin level sensors)

There is no doubt that SiroSilo is a professional corrugated grain bin supplier.

If you want to learn more about our flat bottom silo, welcome to send us an inquiry on this website, and we will try our best to reply to you within 1 hour.

Flat Bottom Silo Ultimate FAQ Guide

Grain Silo

What is the purpose of a grain silo?

Grain silos are storage equipment commonly used in agriculture, farmers purchase grain bins and silos to store grains, seeds, or fermented feed, but they are more commonly used to store grains & seeds.

Store the grain in the silo bin, wait until the grain price rises to a psychological level, then sell the grain.

Farm grain silo not only solves the storage problem for farmers but also improve the grain storage quality.

The farm grain silo can effectively prevent the powder from directly polluting the air, and can also prevent moisture from entering, avoid material agglomeration, protect the material better.

How does a grain silo work?

Speaking of how grain bin works, it actually mainly refers to how grain bin loads material, unloads material, and prevents grain mildew.

Whether it is a flat bottom silo or a hopper bottom silo, the material is loaded from the loading port on the roof, the silo bin is usually equipped with a level sensor to monitor the material level in real-time;

When unloading, the material is discharged from the center discharge port at the bottom.

After discharging most of the material, the auger sweeps the remaining material to the intermediate discharge port for emptying.

In order to prevent food mildew, the flat bottom silo & hopper bottom silo are equipped with temperature control & ventilation systems, these systems ensure that the temperature & humidity in the silo bin are always at a normal level.

What are the 3 types of silos?

There are many ways to classify grain storage silos.

  • Construction Materials
Concrete silo
Brick silo
Wooden silo
Steel silo

The steel silo is assembled by galvanized sheet, which is light in weight, low in cost, high in standardization, short in the construction period, wide in use, easy to realize mechanization in factories.


The steel silo is divided into 3 types: assembly, welded, and spiral (Lipp).

  • Purpose
Short-term storage silo bin
Long-term storage silo bin
Transit storage silo bin

Ports, river wharves, and warehouses along the railway have large grain throughput & many turnover times, fast loading & unloading are especially important.

Large & medium reinforced concrete or steel silos are common in these places, such silos are always equipped with suitable auxiliary equipment.

The silo capacity is generally more than 50,000 tons, it has high mechanization & automation degree, pairs with large loading & unloading capabilities, maintains high efficiency in operation.

The unloading machine lifts the grain from the ship to the conveying equipment on the shore, after the measuring & cleaning, it enters the grain storage silo, all are automatically completed.

  • Capacity

According to the capacity, there are 3 types of silos: large, medium, and small.

Generally, small grain storage silo’s capacity is 200 tons or less, 201-1000 tons is a medium-sized silo, and 1,000 tons or more is a large silo.

  • Bottom Shape

There are 2 types: hopper bottom & flat bottom.

How much do grain silos cost?

The farm silo’s price is mainly related to its construction materials, capacity.

For example, 1,000 tons capacity steel silo, its price in the Chinese market is USD$60,000.00-USD$66,000.00.

Because Chinese products generally have price advantages, if you purchase European & American brand farm silos, the price will definitely be much higher.

How long does grain last in a silo?

In theory, as long as the grain’s moisture content is kept at 13% or lower in the farm silo, the grain can always be stored safely in it.

However, most grains are generally stored from the end of harvest to the point of sale, because an empty farm silo is needed for the next harvest season.

The silo bin can indeed store grain for a long time, as time goes by, the grain in the farm silo will gradually lose its nutrition, which will also affect the grain quality to a certain extent, ultimately affect the grain price.

What’s more, the cost of manpower & material resources for storing grain will continue to accumulate over time.

Grain silo companies

The grain silo companies are listed in the following pictures:





Auger grain bin

Auger grain bins are actually flat bottomed bins, flat bottom bins must be equipped with a sweep auger for unloading material, but hopper bottom bins don’t need it, because grain automatically flows out of hopper bottom bin under gravity.

Sweep auger is a horizontal spiral cleaner that rotates around the center of the silo, it pushes the remaining grain to the intermediate discharge ports for final emptying.

Grain drying silos

The so-called grain drying silos are actually agricultural silos with a drying system, this drying system usually includes hot air fans, vertical stirring augers, and so on.

Searching for stirring silos on Youtube, you will find a lot of videos introducing such grain drying silos.

Grain bin level sensors

The material level sensor measures the interface position between the materials and the gas in the storage container or industrial equipment.

It is mainly used to measure the grain level in agricultural silos, the coal level in thermal power plants, the cement level in cement plants.

Nowadays, the commonly used material level sensors include weighing, heavy hammer, capacitive, microwave, ultrasonic types, etc., the commonly used material level sensor in the agricultural silo is the ultrasonic type.

Each agriculture silo is equipped with high & low position level sensors, these level sensors must be protected to prevent the grain from impacting it.

The level sensor’s mounting hole is well sealed, then the entire level sensor can be easily extracted for inspection & maintenance.

Metal Silo

What are metal silos?

Metal silos are also a kind of grain bin, it is a cylindrical container made of galvanized sheet, used to store wheat, barley, corn, maize, rice, beans, and seeds.

Metal silos are divided into assembly, welded & spiral types, you can choose the steel silo that suits you according to your actual needs & budget.

Steel silo manufacturers

The famous steel silo manufacturers are listed in the figure below.


Grain silo rings


The picture above shows the grain silo wind rings, which are designed & installed according to wind loads.

The wind ring is usually connected to the stiffener through a locking bracket, eliminate distortion & displacement, increase the fixing strength for the silo, it is made of hot-dip galvanized pipe.

The wind rings’ existence increases the metal silo safety & durability.

Silo ladder

There are many kinds of ladders on the silo, mainly including the following types:

  • Roof ladders
  • Spiral ladders
  • Access ladders
  • Vertical ladder to the catwalk

How much does a metal silo cost?

In the Chinese market, the cost of metal silos are shown in the following pictures:



Flat Bottom Silo

Flat bottom silo design


As shown in this picture, the flat bottom silo design is mainly related to the following steel grain silo parts:

  • Support cone
  • Wind rings
  • Handrail
  • Roof vents
  • Roof
  • Cylinder/body
  • Monitor & control system
  • Stiffeners
  • Aeration system
  • Sealing fastener (bolt & screw)
  • Cooling system
  • Fumigation system
  • Sweep auger

Flat bottom silo discharge

In order to unload materials from the flat bottomed silo, there is a main discharge port in the center & a number of intermediate discharge ports.

When unloading, most of the materials are discharged through the main discharge port in the center, then the remaining materials are emptied through the intermediate discharge ports by the sweep auger.

This design can maximize the emptying efficiency, easy & quick emptying saves your time & energy, avoids damage to the flat bottom silo.

What is the difference between silo and hopper?

Putting silo and hopper together, according to the explanation in the formal dictionary, there must be a difference between them.

But from the perspective of industry cognition, hopper is more like a classification under the silo, in order to distinguish it from the flat bottom silo.

The difference between a hopper bottom silo & a flat bottom silo is mainly reflected in their bottom shape.

Hopper bottom silo is more convenient for unloading, suitable for use as a transit silo, the silo capacity is generally less than 1500 tons, it is cost-effective;


The flat bottom silo is generally used for large-capacity long-term storage, the unloading is not as convenient as the hopper bottom silo.

Flat bottom silo price

Undoubtedly, capacity is the most important factor that affects the flat bottom silo price, the larger the capacity, the higher the price.

The price of a 2000-ton flat bottom silo in the Chinese market is shown in the figure below, it ranges from USD$10,000.00 to USD$100,000.00 according to capacity:


If you plan to purchase a flat bottom silo recently, please send us an inquiry on this site, we are worthy of your trust as COFCO supplier.

SiroSilo Industrial could also supply the following products, if you are also interested in any type, please feel free to send us an inquiry too:

  1. Motorized Pulley
  2. Ultrasonic Cleaner
  3. Packaging Machine



    Leave a Reply



    Scan the QR Code with wechat

    Leave your message