At a glance
- Two conveyor quotes can look identical on paper; the real difference is often what the spec sheet leaves out.
- Judge hygienic design by specifics: surface finish (e.g., Ra 0.8 μm), weld method, joint fittings, contact-material grade, and no dead legs.
- Decide how a conveyor will be cleaned before you buy it, because the cleaning method shapes the design.
- Enclosed conveying (like aero-mechanical) limits airborne cross-contact by design, rather than relying on housekeeping to manage it.
- Ask a supplier for design rationale and validated cleaning data and keep changeover verification records once you’re running.
- Floveyor’s Pura Range of aero-mechanical conveyors is engineered to EHEDG, 3-A, FDA, and EC standards for allergen-sensitive food and nutraceutical lines.
Pick two conveyor quotes for the same food-grade application and you’ll often find they look almost identical on paper. They have similar throughput and a similar footprint, both are described as “hygienic”, both are stainless steel, and prices are in the same range. On the strength of the spec sheets alone, it’s hard to tell them apart.
How to specify a food-safe powder conveyor
The difference is what’s not shown in the documents. One supplier states a surface-finish value, names the weld method, and specifies the joint fittings. The other uses the word “hygienic” four times and the rest is left to your imagination. One is specific, the other is open to interpretation.
Learning to read that gap is one of the more useful skills a food or nutraceutical engineer can develop. That includes knowing what to look for in a hygienic conveyor, what a hygienic conveyor spec should contain, and flagging it to the supplier when it doesn’t. This guide walks you through what belongs on the sheet, why each item matters for keeping products apart, and the questions worth putting to a supplier before anything gets signed.
The conveyor’s job in an allergen control plan
Ingredient segregation, changeover procedures, and cleaning validation tend to get the most attention in a food safety plan, and rightly so. But all three depend on the equipment behaving the way the plan assumes it will. A changeover procedure assuming a one-hour clean down doesn’t work if it takes half to a full day to clean your conveyor. A segregation plan assuming a process line is fully clear between products doesn’t hold up if the conveyor has a dead leg nobody’s found or checked.
For powder handling in food and beverage and nutraceutical processing, the conveyor is an active part of the control plan, and it needs to be specified as such.
What “hygienic conveyor design” should mean on a spec sheet
EHEDG (European Hygienic Engineering & Design Group) guidelines are the reference most engineers and auditors use to judge whether a piece of equipment is hygienic. Those guidelines translate into specific, checkable items rather than a general impression of cleanliness, including:
- Surface finish fine enough to resist product adhesion. Floveyor’s Pura Range of aero-mechanical conveyors (AMCs) holds to a maximum Ra of 0.8 μm internally
- Continuous, internally polished welds, with no rough seams for residue to catch on
- Tri-clamp joints fitted with hygienic sealing rings rather than threaded or gasketed connections that degrade unevenly
- No dead legs: every internal cavity is either in the direct product path or has been eliminated from the design
- Corrosion-resistant contact-part material suited to repeated cleaning cycles, such as stainless steel AISI 316(L).
A spec sheet explicitly stating these details is one you can hold a supplier to when evaluating hygienic conveyor design. “Hygienic” can be interpreted multiple ways, depending on the application, whereas Ra 0.8 μm is verifiable.
Example of Floveyor Pura range internally polished sprocket and feed housing design.
It’s worth remembering there is no “EHEDG conveyor”, only conveyors that meet EHEDG guidelines.
| Design element | Vague spec | Specific spec |
|---|---|---|
| Surface finish | "Smooth internal surfaces" | Max Ra 0.8 μm, internally polished |
| Welds | "Hygienic welding" | Continuous, internally blended and polished |
| Joints | "Easy-clean connections" | Tri-clamp with hygienic sealing rings |
| Contact material | "Food-grade stainless steel" | Stainless steel AISI 316(L) |
| Dead legs | Not mentioned | None, every cavity in product path or removed |
| Standards | "Meets hygienic standards" | Named: EHEDG, 3-A, FDA, EC, etc. |
Matching the cleaning method to the product
It’s worth deciding how an allergen control conveyor or a food safety conveyor is going to be cleaned before making a purchasing decision. Products that tolerate water suit wet-cleaning or clean-in-place (CIP) systems. A CIP conveyor is generally the stronger choice where microbial risk is as much a concern as allergen risk. Moisture-sensitive powders need dry-cleaning instead, since introducing water can create a different problem than the one you’re solving.
A well-specified conveyor often supports both: a rapid CIP cycle on the enclosed core, with easy clean-out-of-place (COP) access on ancillary parts like inlets and discharge points that don’t need full washdown every time. Deciding this at the specification stage, rather than discovering it during commissioning, avoids inflicting your operators with a conveyor that’s technically cleanable but practically painful to clean on a normal production schedule.
Why enclosed conveying changes the risk profile
Open conveying systems such as augers, belts, and bucket elevators expose product to the surrounding environment for the length of the transfer. That’s not automatically a food safety failure, but it does create more opportunity for airborne particles to settle where they shouldn’t, and more surface area to inspect and clean.
Aero-mechanical conveying takes a different approach: product moves through a fully enclosed tube, carried by a rope-and-disc system rather than sitting exposed on a belt or in an open trough. The enclosure limits airborne cross-contact between batches by design rather than relying on housekeeping to manage it. It also tends to handle friable or blended powders more gently, which reduces segregation since there’s no direct mechanical agitation of the kind an auger applies.
Floveyor’s Pura Range was built around this approach specifically for allergen-sensitive food and nutraceutical applications and engineered to EHEDG, 3-A, FDA, and EC standards. That’s a different specification tier to equipment built for sterile pharmaceutical processing, but most food and nutraceutical operations don’t need that.
Designing fast changeover and clean batch transfers
Dedicated lines are the cleanest answer to allergen segregation, but they’re not always commercially viable. When a line has to be shared, the hygienic powder conveying equipment needs to support three things:
- A validated changeover procedure that’s achievable in the time allowed
- Sensible product sequencing (allergen-free runs before allergen-containing ones, not the reverse)
- A conveyor that can be opened, cleaned, and reverified without becoming a bottleneck in the process or the reason a changeover runs long.
If the conveyor is the slowest part of a changeover, it becomes the piece of equipment operators are quietly under pressure to rush past. Specifying for fast, verifiable clean down keeps the rest of the segregation plan realistic under normal production pressure.
The paperwork that should exist before you need it
An auditor won’t take a conveyor’s hygienic design on faith, and neither should you. Before committing to a purchase, it’s reasonable to ask a supplier for the design rationale behind the equipment. Find out why it meets the relevant hygienic design principles and ask for validated cleaning data showing the stated clean-down time is achievable in practice.
Once the equipment is running, that documentation needs an ongoing record that verification happens on every changeover. Swab results tied to specific product changes and photographic records of clean-down checks are your evidence for audits. Getting this file built at the specification stage, rather than assembled retrospectively after a problem, is the difference between an audit being routine and an audit being an emergency.
Frequently asked questions (FAQs)
It means a specific set of verifiable features: a surface finish smooth enough to resist product build-up, continuous polished welds, hygienic joint fittings, no dead legs, and contact materials that hold up under repeated cleaning. EHEDG, 3-A, FDA, and EC standards each define measurable requirements for these features.
It depends on the product’s moisture tolerance. Water-tolerant products and situations with meaningful microbial risk suit CIP; moisture-sensitive powders suit dry cleaning. Many operations need both, applied to different lines or product runs.
An enclosed system, such as an aero-mechanical conveyor (AMC), limits airborne cross-contact by design rather than relying on procedure alone. It typically presents fewer internal surfaces for residue to accumulate on. That generally means faster, more reliable clean down between batches.
Look for specific figures rather than general claims: surface roughness values (such as Ra 0.8 μm), weld and joint construction details, contact material grade, and which recognised standards (EHEDG, 3-A, FDA, EC) the equipment is built to meet.
Create a document with validated changeover procedures, sensible product sequencing, and equipment that can be fully cleaned and reverified within the time a changeover allows. The conveyor is often the constraint that determines whether a changeover procedure is realistic in practice.
Talk to us
If you’re specifying hygienic powder conveying equipment for a food and beverage or nutraceutical line, Floveyor’s engineering team can walk you through hygienic design, cleaning method, and documentation requirements before you commit to a design. Our Pura Range, built with FloDisc® Technology, is engineered to EHEDG, 3-A, FDA, and EC standards.
Get in touch to talk through your specification, or visit us on our stand at Powtech from 29 September to 1 October, 2026. We’re exhibiting at Hall 9, Booth Number 9-561.
For more information
If you need hygienic powder conveying machinery and bulk material handling equipment for your food and beverage operation, a Floveyor Pura AMC with FloDisc® Technology will optimise your powder handling. Contact us to learn more.
English
Chinese
Dutch
Finnish
French
German
Hindi
Japanese
Korean
Malay
Polish
Spanish
Thai
Vietnamese