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Silos
This document discusses silos, which are structures for storing bulk materials like grain. Steel silos have advantages over concrete silos like being easier to assemble and allowing for more effective aeration. However, concrete silos have lower maintenance costs and better resistance to corrosion. Galvanization, the process of coating steel with zinc, helps address corrosion issues in metal silos. Zincalume is a proprietary coated steel that provides even better corrosion resistance and thermal reflectivity than galvanized steel, resulting in silos that can last 40-50 years.
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Silos
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- 2. INTRODUCTION • STRUCTURE FORSTORING BULK MATERIAL • FROM GREEK –’SIROS’- “At holding gain”
- 3. Why silos over warehouse? •Requires less ground space • Negligible Spillage and grain loss • Increased reliability • Less labour dependence • Effective fumigation • Real time monitoring by quality and quantity ( SCADA)
- 4. Steel Silos VSConcrete Silos. STEEL SILO • Manufacture in factory • Quality controlled • Easier to erect and install accessories like doors, ladders, samplers, etc. • Structure is more flexible • Easier and more effective to do aeration CONCRETE SILO • At site • Variable - Concreate delivery, Weather • Lower initial cost • Resistance to both internal and external corrosion • No need for painting or other coatings • Lower maintenance costs • No risk of electrolytic effects from welds or fasteners • Concrete is better able to resist abrasions Galvanization process is introduced the corrosion problem in metal silos is resolved.
- 5. Types of Silos •Tower silos • Bunker silos • Bag silos
- 6. Types of Tower silos •Hopper Bottom silos • Flat bottom silos • Bins • Much shorter than silos
- 7. Silo Materials • Corrugatedsteel • withstand the rough climate , safe storage • Galvanization • Process of applying protective zinc coating to steel or iron • To prevent rusting • Z-275, Z-375, Z-450, Z-600. The number means the grams of zinc per square meter that the steel has in both side (inner and outer faces).
- 8. Types of galvanization •Hot Dip Galvanization • parts are submerged in a bath of molten Zinc • Electrostatic Galvanization • Running a current of electricity through a slain /Zinc solution • With Zinc anode and steel conductor • Thermal spray (or metallizing) • Sherardizing and thermal diffusion • Mechanical plating • Zinc rich paints
- 9. Metal coatings • Zinc/Aluminum /Magnesium coating • Aluminum/Zinc/Silicon coating • Trade name - Alzinc , Zincalume , Galvalume, Magnelis, Zincalume
- 10. Magnelis® from Arcelor Mittal •Flat carbon steel product coated on both sides with a zinc aluminium magnesium alloy. • An exceptional metallic steel coating which providing surface protection(corrosion ) • It is produced on a classic hot dip galvanising line which molten bath has a unique • chemical composition including 93.5%zinc, 3.5% aluminium, and 3% magnesium. • Advantages • Outstanding corrosion resistance: three times better than galvanized steel • Self-healing effect which ensures excellent edge protection(cut edges) • Superior corrosion resistance in chloride and ammonia atmospheres • The friction coefficient is lower than the standard hot dip galvanised steel. • Reduces considerably the Zinc run off in soils. • Preventing the development of red rust • Reduces powdering effect • 20-25 years guarantee • Environmentally friendly
- 11. Proprietary & Patentedsteel product of Bluescope Australia, Excellent Thermal Reflectivity , Corrosion Resistant , Lightweight and Stronger Provides up to three to four times the service life of Galvanized steel silos. Average Life of Zincalume Silo is approximately 40-50 years as against 15-20 years of Galvanised steel silos Absorbs only 4% to 5% solar heat as compared to 22% to 26% in Galvanized Steel. High solar heat absorption makes grains more brittle and which ultimately breaks during milling resulting in more Brokens. High thermal reflectivity of heat as compared to GI Silos. No worries about corrosion.