Vacuum technology in the process industry
Moving powders through a plant looks simple, but in practice it is a source of dust, product loss, segregation and physical strain. Vacuum transport solves these problems by moving powder in a closed, dust-free way using negative pressure. For engineers, buyers and QA in pharma, chemicals, food and the battery industry, vacuum technology offers a hygienic, safe and flexible way to move bulk materials through the process. HECHT designs vacuum transport systems matched to your product and layout.
How vacuum transport works
Vacuum transport moves powder through a closed pipeline using a vacuum pump that creates negative pressure at the end. The powder is drawn in at the pick-up point, carried in the air stream and separated from the air in a receiver. The air is filtered and discharged; the powder drops through a valve into the next process step.
Because the system operates under negative pressure, no dust escapes in the event of a leak — air is drawn inward instead. This makes vacuum transport inherently safer than transport under positive pressure.
The core components of a vacuum system
A reliable vacuum transport system consists of matched components.
- Pick-up point — lance, hopper or suction nozzle that takes the powder from a bag, big bag or container
- Transport line — smooth, earthed pipe or hose that guides the powder without loss
- Receiver — vacuum separator in which powder and air are separated
- Filter unit — cartridge or bag filter that removes fine dust from the exhaust air
- Vacuum generator — pump or venturi that delivers the required negative pressure
- Outlet valve — valve that passes the powder in metered fashion to the next step
Advantages over mechanical transport
Mechanical transport systems such as screws and conveyor belts have moving parts in contact with the product, bringing wear, cleaning and contamination issues. Vacuum transport offers structural advantages.
- Dust-free — fully closed transport protects operators and the environment
- Hygienic — smooth, cleanable pipes without dead spots, suitable for GMP and EHEDG
- Flexible — pipes follow any route through the plant, including vertical runs
- Product-friendly — controlled velocity limits particle breakage and segregation
Applications in the process industry
Vacuum transport suits a wide range of powders and processes.
- Pharma — transport of APIs and excipients under containment, with validation to GMP
- Chemicals — moving pigments, catalysts and additives, often in ATEX environments
- Food — hygienic transport of milk powder, cocoa, flour and spices
- Battery — transfer of cathode and anode powders under inert, moisture-free conditions
Containment and operator protection
For highly active substances, vacuum transport is a natural containment strategy. Because the powder is never exposed to open air, operator exposure is minimal. Combined with split butterfly valves at pick-up and discharge points, a vacuum system can meet high OEB classes.
Containment performance is verified to SMEPAC, giving you objective exposure figures. For combustible powders the system is earthed and built ATEX-compliant, optionally with nitrogen inerting.
Design factors that determine performance
The performance of a vacuum system depends on correct sizing. An undersized system clogs; an oversized system wastes energy and can damage powder.
- Product properties — density, particle size, flowability and moisture sensitivity
- Transport distance and height — determine the required negative pressure and air flow
- Throughput — required capacity in kilograms per hour
- Cycle time — continuous or batch, depending on the downstream process
HECHT determines these parameters through product analysis and, where needed, transport trials in its own test centre.
Frequently asked questions about vacuum transport
Why is vacuum transport safer than pressure transport?
Under negative pressure, air is drawn inward, not blown outward. In a leak, no dust is released, protecting operators and the environment.
What distances can vacuum transport cover?
Depending on product and system, distances of several tens of metres horizontally and vertically are achievable.
Does vacuum transport damage the product?
With correct sizing and velocity control, particle breakage is minimal; HECHT matches air velocity to breakage sensitivity.
Is vacuum transport suitable for highly active substances?
Yes, combined with split butterfly valves and SMEPAC-verified containment it suits high OEB classes.
How is the system cleaned?
Via WIP or CIP, depending on the version, so cleaning takes place without disassembly and reproducibly.
How do I choose a vacuum transport system for pharmaceutical powders?
Match the system to the OEB classification of your substance: standard vacuum conveying suits low-potency excipients (OEB 1 to 3), while high-potency APIs (OEB 4 to 6) require containment-integrated vacuum transport with split-valve or isolator connections and SMEPAC-validated performance.
Related guides
Tailored advice from HECHT
A vacuum system that fits your product starts with a thorough analysis of your powder, distance and throughput. HECHT sizes, tests and supplies vacuum transport that is dust-free, hygienic and safe, and that integrates seamlessly with your dosing and filling systems. Contact us for a transport analysis and a tailored system proposal.