Flat-bottom silo cleaning and floor systems
Flat floors, discharge points, aeration equipment and reclaim systems can all retain material after normal unloading.
Silo types, stored materials and deposits
Silo cleaning library
A technical reference covering silo construction, stored products, retained deposits and the factors that affect cleaning and return to use.
Technical informationSources and further reading
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41 reference records · 9 detailed guides
Silo types and cleaning considerations
Silo geometry and construction affect access, discharge arrangements, retained material and the surfaces that need cleaning. Flat-bottom, hopper, tower and bunker silos describe different storage arrangements, while fabric and GRP describe construction materials.
Hopper silo cleaning and flow behaviour
Cone geometry, outlet condition, internal finish and the stored material all influence cleaning and deposit removal in hopper-bottom silos.
Tower silo cleaning and storage arrangements
Tower silos vary widely in contents, wall construction and unloading equipment, so the cleaning method depends on the specific installation.
Bunker silo cleaning and effluent control
Horizontal silage stores involve retaining walls, floors, drainage channels and effluent collection rather than the enclosed geometry of an upright silo.
A bund is secondary containment around a liquid tank. A bunker silo is horizontal bulk storage. For a liquid-tank bund, see bunded tank cleaning.
Stored materials and retained deposits
The same silo may need a different clean when the product, deposit condition or next use changes. Food powders can bring hygiene, allergen and combustible-dust concerns. Mineral powders may harden after moisture exposure, while agricultural products can deteriorate in storage.
- Stored material: exact product or grade, including ingredients and any allergens that affect the cleaning standard.
- Deposits: location, extent, condition and any known change in flow or moisture.
- Equipment: silo construction, outlet or reclaim equipment and connected conveying systems.
- Return to use: next product, hygiene requirements and the operator’s acceptance criteria.
Reference sources for this library
These sources support the technical points in the library. Manufacturer information applies to the equipment or application it describes, and regulatory guidance applies only within its stated scope and jurisdiction.
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Food powders
Flour silo cleaning
Flour silo cleaning needs to account for retained flour, combustible dust, hygiene controls and the standard required before refill.
Read the guideReference checklist and technical facts
- Stored material
- Flour or a flour-based blend
- Key risks to assess
- Dust, engulfment and product contamination
- Identify
- Exact flour or blend and next product
- Release criteria
- Set by the food-business hygiene plan
- Exact flour or blend
- Deposit and flow observations
- Silo construction and access
- Allergen and hygiene release plan
HSE: preventing dust explosions in the food industry
Get a quoteFood powders
Sugar silo cleaning
Sugar silo cleaning depends on the sugar grade, moisture and caking, dust risk and the standard required before refill.
Read the guideReference checklist and technical facts
- Stored material
- Sugar or sugar-containing product
- Possible condition
- Loose product, caked deposits or retained residues
- Key assessment
- Combustible dust and product hygiene
- Next-use check
- Cleanliness and dryness required by the site
- Sugar grade or blend
- Caking and moisture history
- Silo layout and outlet condition
- Drying and release requirements
HSE: preventing dust explosions in the food industry
Get a quotePowder and bulk-handling materials
Baking mixes
Gericke identifies baking mixes as a food-industry bulk-material application. For cleaning, the useful details are the mix itself, relevant ingredients and the storage or conveying equipment containing residue.
Gericke: powder and bulk-material handlingThe link above opens the source used for this reference entry.
Reference checklist and technical facts
- Exact baking mix, including relevant ingredients and allergens.
- Silo, hopper and connected conveying equipment containing retained material.
Gericke: powder and bulk-material handling
Get a quoteFood powders
Custard powder
HSE lists custard powder as an example of an explosible food dust. The formulation and the parts of the storage or handling system holding residue are the main points to establish before cleaning.
HSE: preventing dust explosions in the food industryThe link above opens the source used for this reference entry.
Reference checklist and technical facts
- Custard powder formulation, including relevant ingredients and allergens.
- Silo, hopper and connected conveying equipment containing retained custard powder.
HSE: preventing dust explosions in the food industry
Get a quoteFood powders
Dried milk powder
HSE lists dried milk among food dusts that can be explosible. The milk-powder grade, relevant ingredients or allergens and the equipment holding retained powder all affect the cleaning assessment.
HSE: preventing dust explosions in the food industryThe link above opens the source used for this reference entry.
Reference checklist and technical facts
- Exact dried milk powder grade, including ingredients and relevant allergens.
- Silo, hopper and connected conveying equipment containing retained dried milk powder.
HSE: preventing dust explosions in the food industry
Get a quoteFood powders
Instant coffee powder
HSE includes instant coffee among examples of explosible food dusts. The grade or blend, retained powder and affected storage or conveying equipment all matter to the cleaning assessment.
HSE: preventing dust explosions in the food industryThe link above opens the source used for this reference entry.
Reference checklist and technical facts
- Exact instant coffee grade or blend.
- Storage, hopper or conveying equipment affected by retained powder.
HSE: preventing dust explosions in the food industry
Get a quotePowder and bulk-handling materials
Muesli ingredients
Gericke lists muesli among its food bulk-material applications. Previous ingredients and the required changeover standard determine how retained material needs to be dealt with before the next product.
Gericke: powder and bulk-material handlingThe link above opens the source used for this reference entry.
Reference checklist and technical facts
- Ingredients previously handled, including relevant allergens.
- Storage and handling equipment included in the product changeover.
Gericke: powder and bulk-material handling
Get a quoteFood powders
Potato powder
HSE includes potato powder in its examples of explosible food dusts. The product grade and the position and condition of retained powder need to be clear before the cleaning method is assessed.
HSE: preventing dust explosions in the food industryThe link above opens the source used for this reference entry.
Reference checklist and technical facts
- Exact potato powder grade or formulation.
- Location and condition of retained powder in the storage or handling system.
HSE: preventing dust explosions in the food industry
Get a quoteFood ingredients
Powdered flavour ingredients
Gericke lists flavours among chemical bulk-material applications. For powdered flavour ingredients, the formulation, retained residue and required changeover standard need to be established for the product concerned.
Gericke: powder and bulk-material handlingThe link above opens the source used for this reference entry.
Reference checklist and technical facts
- Flavour formulation, including carrier materials and relevant allergens where applicable.
- Retained powder in storage and transfer equipment.
- Changeover standard for the next product.
Gericke: powder and bulk-material handling
Get a quoteFood powders
Soup powder
HSE lists soup powder among examples of explosible food dusts. Its formulation and the equipment containing retained powder determine the information needed for cleaning and dust assessment.
HSE: preventing dust explosions in the food industryThe link above opens the source used for this reference entry.
Reference checklist and technical facts
- Soup powder formulation, including relevant ingredients and allergens.
- Storage and handling equipment containing retained powder.
HSE: preventing dust explosions in the food industry
Get a quotePublished by Silo Cleaning. Sources checked 12 September 2026. Editorial policy.
Please contact us if you identify a factual error in this library.
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