Filling and discharge


1.  Basics before construction

Every bulk material has its own challenge:

It is always a matter of finding the best choice for the filling and discharge of each material. Determining factors are bulk type, granulometry, density and conveying kind.


2.  Filling

Silos are mostly filled pneumatically. But there are also other filling forms possible that must be considered by the construction of a silo. So is for example the wall of a unidirectional filled silo (filled by a loader or a helicopter) to be build different than a centric filling with a tube/pipe. Often there is also additional ventilation or filter needed. For all these cases and many others we have the right solutions.


3.  Silo construction

For the storage of bulk, powder or granulate material in a silo, further considerations are necessary. How does the material settle? How does it spread by the storage or how strongly can it be compacted afterwards? Which dangers exist and which requirements need to be fulfilled? And then it is already about the discharge of the material. Thus the flow characteristics together with the geometry of the silo influence decisively whether core flow or mass flow occurs while discharging the material.

One basic rule: Discharge should occur as far as possible through gravitational force.

At this point, the job of our specialists begins, because here they decide which material needs to be used for the construction of the silo in order to reduce the wall friction and to ensure the discharge of the material that needs to be stored.

These are duties that we take seriously so that with the help of the recommendation of our specialists and taking into account your and our experiences, we can together set up the final construction details.


4.  Segregation

While filling and discharging the material in the silo, the material to be stored can be alterated, especially when it is an inhomogeneous material. This can lead to undesired fluctuations in the production.

Right there is where the years of experience of our specialists help to select the exact components and discharge devices which ensure that the stored material remains homogeneous. It begins with the filling and does not end with the discharge of the material.


5.  Discharge systems

Very often we have built silos and have adapted them to the customer owned specific discharge system. Since 2013 we have had an additional approach by suggesting to our customers discharge systems that have been either developed by ourselves or have been identified by our development team as suitable to the needs of the customers, and have successfully installed them as well. Because our specialists in bulk material take a closer look at the material that needs to be stored by examining it in our own technical lab and testing center, we can offer to you a real individual solution totally adapted to your needs. Beside our own possibilities, we also work together with well-known external institutes and labs.

Here some examples:

- EPS-granules with one or two suction lines and integrated air flushing to reduce servicing and maintenance costs

- Discharge system with integrated fine particulates separation to improve the material flow and the subsequent treatment

- Transfer of granular materials and pelletized bulk material with adjustable pneumatic conveyance


6.  Discharge support

If the discharge of the material cannot be done just by the use of gravitational force, we offer the corresponding discharge support.

Here some of the possible choices:

- A special installation inside of the silo cone or in the bottom of the silo introduces directed air in order to make powdery materials flowable or fluidized. In other words: Flour becomes water.

- Another method is the movement in the silo cone by using several built-in pillows which make the whole cone move around in order to avoid bridge building.

- Punctual modification of the wall in order to diminish bridge building.

- Discharge through precise initiated oscillations or vibration is another option.

- Impulse-like knocks through mechanical or pneumatic devices

- "Stirrers" or mechanical distribution/spreading systems


Our standard

- Reliable filling and discharge

- Subsequent installations for existing plants

- Less costs for servicing and maintenance

- Effective use or the available energy (air pressure, electrical system, hydraulics)

- If requested autonomous or integrated control system