Flat-Bottom Steel Silos • OBIAL & MAFAL
Flat-bottom steel silos manufactured from high-strength steel sheets with Magnelis ZM310 coating; scalable from 4.51 m to 31.60 m in diameter and from 50 tons up to 15,000 tons, in line with international standards.
High-Strength Flat-Bottom Steel Silos
OBIAL and MAFAL steel silos are engineered to deliver maximum durability, long service life, safe access, and precise temperature monitoring for grain storage operations. Broad diameter and capacity ranges provide a modular structure adaptable to different climates and project requirements.
Magnelis ZM310 Protection
High-tensile steel sheets with Magnelis ZM310 coating provide superior corrosion resistance against rust, ensuring a long-lasting silo body and roof structure.
Wide Diameter & Capacity Options
Project-specific solutions for facilities of different scales, with a wide capacity range from 4.51 m to 31.60 m in diameter and from 50 tons up to 15,000 tons.
Temperature Control & Traceability
Hot spots and insect activity are detected through temperature cables, sensors, and PLC integration—helping protect product quality and food safety.
Safe Access and Maintenance
Internal/external ladders, safety cages, rest platforms, and inspection hatches enable safe, ergonomic access inside the silo and onto the roof in compliance with standards.
OBIAL & MAFAL Steel Silo Solutions
With the same engineering approach, we offer flat-bottom steel silo solutions under the OBIAL and MAFAL brands for different projects and markets.
OBIAL Flat-Bottom Steel Silos
- Diameter: Broad options from 4.51 m to 31.60 m
- Capacity: Various models and volumes from approx. 5 tons up to 15,000 tons
- Galvanized coating standard: approx. 600 g/m² (scalable upon customer request)
- Single-piece galvanized outer sheet; inner layer with two stacked door structure
- Safe access via roof inspection hatch even when fill level is high
MAFAL Flat-Bottom Steel Silos
- Diameter: Modular solutions from 4.51 m to 31.60 m for international projects
- Capacity: Wide storage volume options from 50 tons up to 15,000 tons
- Magnelis coating rate: 310 g/m² – long-term corrosion resistance
- Round door for smaller diameters/capacities; rectangular door for larger diameters/high capacities
Structural Design and Load-Bearing System
Flat-bottom steel silos are designed with high safety factors, considering vertical loads, dynamic loads, wind loads, and snow loads.
Vertical Stiffener Supports
Vertical stiffeners mounted on the silo shell efficiently transfer vertical loads and grain pressure to the foundation, improving shell stability.
High-Quality Fasteners
For maximum strength at all MAFAL silo joints, bolts with 10.9 grade Cr+3 White passivation + Lac coating are used.
Sealing Solutions
Special sealing elements are applied at body sheets and roof joints for airtightness and water tightness, minimizing product loss and moisture ingress.
Material Quality and Corrosion Resistance
Silo lifespan is directly linked to material quality and surface coating. OBIAL and MAFAL silos are manufactured from high-tensile steel sheets with Magnelis/galvanized coating.
Magnelis ZM310 Coating
- High corrosion resistance suitable for aggressive climates and industrial environments
- Long-lasting surface protection for the silo body and roof components
Galvanized Coating Standards
- Approx. 600 g/m² galvanized coating standard for OBIAL silos
- 310 g/m² Magnelis coating rate for MAFAL silos
- Coating options tailored to customer demands and project requirements
Accessibility, Safety, and Roof Design
In flat-bottom steel silo design, not only product safety but also safe and ergonomic access for maintenance teams is prioritized.
Doors and Access Points
All MAFAL silos include a secure access door on the second tier that is easy to open/close. Round doors are used for smaller diameters/capacities, while rectangular doors are used for larger diameters/high capacities. When the fill level exceeds the door, access into the silo is provided via the roof inspection hatch.
Internal & External Ladders
An internal ladder enables entry into the silo; an external ladder with a safety cage and rest platforms provides access to the inspection hatch. On the roof, a safe roof ladder with double handrails extends from the eaves level to the apex.
High-Strength Roof System
MAFAL silo roofs are designed to carry loads from top handling equipment, snow and wind loads, and the weight of temperature cables. A 30° roof slope supports optimum filling. For large-diameter silos, truss-form roofs built with special section profiles further improve durability and service life.
Temperature Control System and PLC Integration
The temperature control system protects product quality by early detection of hot areas and insect activity, reducing reloading and sampling costs.
Temperature Cables and Sensors
- Sensors inside temperature cables measure grain temperature at different heights and points.
- Cables are reinforced with special steel ropes to resist elongation.
Portable / Fixed Monitors
- Grain temperature profile inside the silo is monitored via portable or fixed temperature monitors.
- Hot spots and potential insect activity are detected at an early stage.
PLC-Integrated Management
- By integrating the temperature control system with PLC, grain temperature can be monitored via the automation system.
- Automatic scenarios can be configured for alarm thresholds, aeration, and other actions.
Gallery
It can be enriched with sample visuals showing the exterior of flat-bottom steel silos, roof details, internal access components, and temperature control cables.
Frequently Asked Questions
Magnelis ZM310 is a specialized coating technology that provides higher corrosion resistance than conventional galvanizing. This extends the service life of the silo body and roof components and reduces maintenance and renewal costs.
OBIAL and MAFAL flat-bottom steel silos can be scaled to project requirements with capacity options from approx. 4.51 m to 31.60 m in diameter and from 50 tons up to 15,000 tons.
The temperature control system is a critical module for product safety, especially for long-term grain storage, and is strongly recommended. It can be configured as mandatory or optional packages depending on project needs.