System-selection workflow: the evaluation begins with defined process conditions, material data and equipment boundaries. The most reliable pneumatic conveying projects do not begin by asking which roots blower model is largest enough. They begin by defining the material, route and production duty, then determine the air volume and pressure the complete system requires. The blower is selected after those decisions have created a measurable operating envelope.
This sequence reduces the risk of oversizing, pressure shortfall and responsibility gaps between the feeder, pipeline, receiver and blower suppliers.
Step 1: Freeze the Material Design Basis
Document the material grade, particle-size distribution, bulk density range, moisture, temperature, friability, abrasiveness and credible variability. Identify hazardous properties through the project’s separate safety assessment.
If proven conveying data do not exist for the actual grade, define a material trial before committing to a production guarantee. Data from another product or high-pressure rig should be treated as screening evidence only until compatibility is demonstrated.
Step 2: Define the Production Duty
State normal, peak and minimum material rates, continuous or batch operation, annual hours, starts per hour and required line-clearing sequence. Include every material and destination expected during the contract period.
The duty should also identify product-quality limits such as maximum degradation, temperature or contamination. These constraints may set the maximum acceptable velocity before the blower reaches its mechanical capacity.
Step 3: Survey the Complete Route
Record actual straight lengths, bends, vertical lift, valves, diverters, flexible sections, pipe bore and possible future extensions. Distinguish the normal route from the longest and most restrictive route.
The system boundary should include blower-package losses, feeder leakage or pressure requirement, receiver and filter resistance. A line-length figure without these components cannot produce a dependable differential-pressure duty.
Step 4: Select and Verify the Feeding Method
The feeder must introduce material at the required rate while limiting uncontrolled gas leakage. Its performance affects blower airflow, pipeline stability and achievable turndown.
Confirm feeder capacity with the real bulk-density range, pressure differential and product condition. A nominal pocket volume or screw speed is not a delivered-solids guarantee.
Step 5: Establish the Airflow Range
Use representative data to define minimum stable airflow, normal operating airflow and the maximum acceptable velocity. State whether the result is mass flow, actual blower-inlet volume or a referenced standard volume.
Site altitude, temperature and inlet restriction can change the air mass delivered by the same indicated volume. These corrections should be completed before a blower model is evaluated.
Step 6: Build the Pressure Budget
Add normal and maximum credible losses for the clean and loaded system. The maximum point should include the agreed receiver-filter condition, active route, feeder state and reasonable material variation. Avoidable restrictions should be corrected rather than converted automatically into a higher blower pressure.
The relief-valve setting is not the normal design pressure. Operating margin must remain below the selected blower and system limits.
Step 7: Select the Roots Blower and Motor
Compare the required flow-pressure points with model-specific performance and power diagrams. Verify speed, absorbed power, motor rating and discharge temperature at normal, maximum and reduced duties.
Pasifik Blower offers positive-pressure two-lobe and three-lobe models, but the published portfolio range is not a per-model guarantee. Selection must use the applicable diagram and actual site conditions.
Step 8: Define Controls and Acceptance
Specify startup permissives, valve sequencing, minimum airflow protection, high-pressure shutdown, filter alarm and feeder interlock. Agree how airflow, pressure, electrical input and delivered solids will be measured during acceptance.
The result is a selection record that links material performance to the conveying system and machine performance to the roots blower. This provides purchasing with comparable bids and gives operations a verified basis for future adjustment.
Glossary
Concept screening: Early assessment used to reject system options that do not meet essential requirements.
Design basis: Controlled set of material, process, site and performance inputs used for engineering.
Duty definition: Quantified statement of the normal, maximum and reduced operating requirements.
Hold point: Stage beyond which selection does not proceed until specified information is approved.
Selection workflow: Ordered engineering process that converts requirements into an equipment decision.