A Practical Guide to Selecting Conveyor Width, Capacity, Slope, Air Supply and Layout for Dry Powder Handling
Introduction
Air slide conveyor selection should be based on the complete conveying duty rather than material type or nominal capacity alone. A suitable system must match the powder characteristics, required throughput, conveying distance, available elevation difference, air supply and inlet/outlet arrangement.
Because an air slide conveyor relies on fluidization and gravity, the available downward slope is especially important. A conveyor that is wide enough for the required capacity may still perform poorly if the material cannot fluidize consistently, the airflow is insufficient or the conveying route does not provide enough elevation difference.
This guide explains the main engineering factors used for preliminary air slide conveyor selection before final dimensions and technical drawings are confirmed.
Step 1: Confirm Material Suitability
Material properties are the first screening factor in air slide conveyor selection because the conveying principle depends on stable fluidization.
Before sizing the conveyor, confirm:
✓ Material type
✓ Bulk density
✓ Particle size or fineness
✓ Moisture content
✓ Material temperature
✓ Flowability and tendency to agglomerate
Dry, fine and fluidizable powders such as cement, fly ash, raw meal and some mineral powders are generally suitable. Wet, sticky, coarse or strongly caking materials may require another conveying method.
For a detailed discussion of how different powders behave during fluidization, see the Air Slide Conveyor Material Compatibility Guide.
Step 2: Determine the Required Conveying Capacity
Air slide conveyor width is strongly influenced by the required conveying capacity, but capacity should not be considered independently from material properties and conveying slope.
For preliminary selection, confirm the normal operating capacity and any expected peak throughput. A conveyor selected too close to its theoretical capacity may have limited operating margin when material condition, feeding rate or airflow changes.
LVRUI provides reference capacities for standard XZ/AS air slide conveyor widths from 200 to 800 mm. These values are used for preliminary model screening only; final capacity must be confirmed according to the actual material, conveying slope, distance, airflow and outlet conditions.
Step 3: Check Conveying Distance and Available Elevation Difference
Because an air slide conveyor relies on gravity after the powder is fluidized, the complete conveying route must maintain a continuous downward slope.
Before selecting the conveyor, confirm:
✓ Horizontal conveying distance
✓ Inlet elevation
✓ Outlet elevation
✓ Available height difference
✓ Required bends or route changes
✓ Number and location of discharge points
A long conveying distance is not automatically a problem, but the available elevation difference must be sufficient for the complete route. If the layout requires uphill or vertical conveying, an air slide conveyor is generally not the correct equipment.
This is why conveyor selection should begin with the site layout rather than chute width alone.
Step 4: Select a Preliminary Conveyor Width
Once the material, required capacity and conveying route are understood, a preliminary conveyor width can be selected.
The required width depends primarily on:
✓ Required conveying capacity
✓ Material bulk density
✓ Fluidization characteristics
✓ Installed slope
✓ Conveying distance
✓ Feeding stability
Standard widths provide a starting point, but the final model should not be selected from a single capacity value. The inlet arrangement, available air supply and downstream discharge conditions must also be checked before the conveyor width is finalized.
Step 5: Confirm Air Supply and Fluidizing Fabric
The blower and air slide fabric must work together to provide uniform fluidization across the conveying surface.
The required airflow and pressure depend on factors such as conveyor width, conveying length, fabric permeability, material properties and pressure loss through the system.
During preliminary selection, confirm:
✓ Available blower arrangement
✓ Air distribution along the conveyor
✓ Fabric type and permeability
✓ Material temperature
✓ Sealing condition between sections
More airflow does not automatically improve conveying performance. Excessive or uneven air can create unstable flow, while insufficient airflow may cause poor fluidization and material buildup.
For general reference on textile air-permeability testing, see ISO 9237 – Determination of the permeability of fabrics to air.
Step 6: Check Inlet, Outlet and Feeding Conditions
Air slide performance also depends on how material enters and leaves the conveyor.
The inlet should provide stable feeding without continuously overloading the conveying surface. At the discharge end, the outlet and downstream equipment must allow the fluidized powder to leave without excessive restriction.
Confirm:
✓ Inlet dimensions and position
✓ Upstream feeding equipment
✓ Outlet dimensions
✓ Number of discharge points
✓ Downstream equipment
✓ Required flow-control or shut-off valves
For silo discharge applications, a flow control gate can be used upstream where regulated feeding into the air slide is required.
Step 7: Confirm the Complete Conveyor Configuration
The final air slide conveyor configuration should match the complete plant layout rather than a single straight conveying length.
Depending on the route, the system may include:
✓ Straight air slide sections
✓ Bend or transition sections
✓ Multiple outlets
✓ Air slide diverters
✓ Flow control gates
✓ Inspection sections
✓ Connections to silos, hoppers or bulk loading equipment
Long conveying routes may also be divided into multiple sections for manufacturing, transportation and installation.
The complete route should be reviewed before final production drawings are approved.
Common Air Slide Conveyor Selection Mistakes
✓ Selecting by capacity alone
Reference capacity is only one part of the decision. Material properties, slope, distance and air supply must also be checked.
✓ Ignoring available elevation difference
The complete route must maintain a continuous downward slope.
✓ Using one configuration for different materials without review
Different powders may require different airflow, fabric and operating conditions.
✓ Ignoring inlet and outlet restrictions
Poor feeding or restricted discharge can reduce system performance even when the conveyor itself is correctly sized.
✓ Increasing airflow instead of identifying the actual cause
Unstable conveying may result from material moisture, fabric condition, feeding or layout rather than insufficient blower capacity.
✓ Finalizing the equipment before confirming the site layout
Connection positions, elevations and downstream equipment should be checked before production drawings are approved.
When Is an Air Slide Conveyor Not the Best Choice?
An air slide conveyor may not be suitable when:
✓ The material is wet, sticky, coarse or difficult to fluidize.
✓ Vertical or uphill conveying is required.
✓ The route cannot maintain a continuous downward slope.
✓ Precise mechanical feeding or dosing is required.
✓ The process requires positive conveying independent of gravity.
In these situations, screw conveyors, pneumatic conveying systems or bucket elevators may be more appropriate depending on the material and plant layout.
For a direct comparison, see Air Slide Conveyor vs Screw Conveyor .
Conclusion
Air slide conveyor selection should combine material suitability, required capacity, conveying distance, available elevation difference, air supply and inlet/outlet conditions.
The correct conveyor width and configuration can only be confirmed after these factors are reviewed together. For project-specific sizing, the final layout and technical drawings should be based on the actual operating conditions rather than a generic material rule.
Air Slide Conveyor Selection FAQs
What information is required for air slide conveyor selection?
The main information includes material type, bulk density, particle size, moisture, temperature, required capacity, conveying distance, inlet and outlet elevations, available height difference, connection dimensions and site layout.
Can an air slide conveyor be selected from capacity alone?
No. Capacity is only one selection factor. Material fluidization, slope, conveying distance, airflow, feeding and outlet conditions must also be evaluated.
How does conveying distance affect air slide conveyor selection?
Longer conveying routes require careful review of the available elevation difference, air distribution and section arrangement. The complete route must maintain a continuous downward slope.
How is the correct air slide conveyor width selected?
A preliminary width is selected according to required capacity, material properties and conveying slope. Final sizing should also consider conveying distance, airflow and inlet/outlet conditions.
When should another conveying method be selected?
Another method should be considered when the material does not fluidize reliably, when uphill or vertical conveying is required, or when the route cannot provide sufficient downward slope.
Need Help Confirming an Air Slide Conveyor Selection?
Send LVRUI your material, bulk density, particle size, moisture, temperature, required capacity, conveying distance, inlet/outlet elevations, available height difference, connection dimensions and site layout.
Based on these conditions, LVRUI can recommend a preliminary conveyor width, section arrangement, air supply configuration and inlet/outlet layout for technical review.
Email: info@lvrui-conveyor.com
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