Pneumatic conveying capacity is the sustainable solids throughput that a complete system can deliver under stated material and operating conditions. It is not the free-air capacity of the blower, the swept volume of the feeder or the nominal diameter of the pipe. Each of those values contributes to the result, but none can establish material throughput alone.
Start with the Required Solids Duty
A buyer should define minimum, normal and peak solids flow, operating hours and acceptable variation. Batch duties must distinguish time-averaged production from the higher instantaneous rate during actual conveying. Continuous duties must include feed fluctuations and future operating cases.
The material data should cover particle size, bulk density, moisture, cohesion, permeability, abrasiveness and friability. A system rated for one powder cannot be assumed to retain the same capacity after a product grade changes.
Pipe Bore Creates a Velocity Tradeoff
For a stated actual airflow, a smaller internal bore increases gas velocity. This can improve particle pickup but also raise air friction, bend wear, product impact and filter loading. A larger bore reduces velocity and may lower some pressure losses, but it can allow particles to settle if the local velocity falls below the stable range.
The completed bore must include liners, wall thickness and manufacturing tolerance. Nominal pipe size is not sufficient when a wear lining significantly reduces flow area.
Available Pressure Sets the Resistance Budget
The air source must overcome feeder and supply losses, gas friction, solids acceleration, material-wall interaction, bends, vertical lift and receiver-filter resistance. As solids rate increases, material-related pressure commonly rises and the operating point can approach the blower’s power or temperature limit.
Additional pressure does not automatically create more capacity. If the feeder surges, the receiver filter is undersized or the material is unsuitable for the intended mode, increasing blower speed may increase gas velocity without delivering the target solids rate.
Feeder Capacity and Pipeline Capacity Must Match
A rotary valve, screw or other feeder can mechanically deliver more material than the line can transport. The sustainable feed rate is limited by effective pipeline airflow after leakage and by the pressure available during peak loading.
The receiver and vent filter must also handle the actual air volume and solids rate at local conditions. A filter that accumulates excessive differential pressure can reduce the remaining conveying margin and force the blower toward a higher load.
Compare Proposals on a Common Basis
Competing proposals should use the same:
- Material sample and condition.
- Guaranteed solids throughput.
- Source and destination boundaries.
- Route and pipe bore.
- Airflow reference conditions.
- Maximum operating pressure.
- Feeder leakage assumption.
- Filter clean and loaded losses.
- Product-degradation and wear criteria.
- Electrical-input reporting point.
Without these common boundaries, a low motor rating may reflect a different pressure, solids rate or operating margin rather than a more efficient design.
Future Capacity Requires a Defined Case
“Future expansion” should be translated into a specific solids rate, route or additional destination. The engineer can then determine whether spare blower speed, motor capacity, pipe velocity and filter area exist. A generic percentage allowance can lead to an oversized line that performs poorly at current production.
Pasifik Blower Duty Confirmation
Pasifik Blower selection begins after the system designer establishes the required conveying airflow and maximum differential pressure. The selected two-lobe or three-lobe model must provide the necessary flow at that pressure while remaining within speed, absorbed-power and discharge-temperature limits.
The portfolio-wide flow range and 1,000 mbar maximum must not be interpreted as a throughput guarantee. A defensible quotation connects a specific roots blower duty point to material-specific conveying data and the capacity of every interface in the system.
Glossary
Capacity bottleneck: Component or process condition that sets the maximum sustainable system throughput.
Completed bore: Actual internal pipe diameter after wall thickness, liners and tolerances are included.
Guaranteed throughput: Contractually defined solids rate achieved under stated material and operating conditions.
Instantaneous solids rate: Material flow during the active conveying period rather than its average over a complete cycle.
Peak duty: Most demanding credible combination of material rate, airflow and system resistance.
Sustainable capacity: Solids throughput that can be maintained without exceeding stability or equipment limits.
Throughput margin: Verified difference between required solids capacity and tested or calculated sustainable capacity.
Transfer boundary: Defined starting and ending conditions used to compare conveying proposals.