Pneumatic conveying test data: a defensible assessment must connect process data, material behavior and equipment boundaries. Material tests can reduce the uncertainty in pneumatic conveying design, but only if the results move through a controlled decision process. A test curve should not pass directly into a blower quotation. It must first be accepted, scaled within defensible limits, checked against the plant route and converted into a clearly bounded airflow-pressure duty.
A gated process gives each stage a defined output and approval criterion. It also creates a record showing which assumptions belong to the conveying designer and which performance commitments belong to the roots blower supplier.
Gate 1: Accept the Material Test
The test sample should represent the production grade in moisture, particle distribution, bulk density, temperature and handling history. The report should contain synchronized airflow, pressure and solids-rate measurements at stable conditions, together with the route, pipe bore, feeder and receiver configuration.
Repeatability is essential. If nominally identical runs produce inconsistent results, the cause should be resolved before a design point is selected. Test points involving blockage, incomplete line clearing or continuing product accumulation should be recorded as failures rather than averaged into the performance curve.
The gate passes when the material and measurements are representative enough for the intended decision and the uncertainty has been stated.
Gate 2: Confirm Scale-Up Compatibility
The plant route is compared with the test line for distance, bore, bends, vertical sections, feeder concept and pressure region. Scaling methods should remain within their documented range, and the expected flow regime should match the demonstrated behaviour.
If the plant requires a much longer route, a new bore and a different feeder simultaneously, the test may still be informative but not design-grade. The team can respond with additional testing, a conservative pilot stage or a specialist model rather than forcing the existing data to fit.
Gate 3: Select an Operating Region
The proposed point must meet the material-rate target while preserving a margin above unstable transport. It must also remain below acceptable velocity, wear, degradation and receiver-filter limits. The lowest possible airflow is not automatically the best point, and the highest demonstrated throughput is not automatically a continuous-production rating.
Normal variation should be considered: material moisture, feeder leakage, inlet-air density and filter resistance all change the real operating condition. The output of this gate is an operating region, not one falsely exact point.
Gate 4: Complete the Air-System Pressure Boundary
The pipeline result is expanded into the total blower duty. This includes inlet filter and silencer losses, discharge piping, feeder leakage, valves, receiver and clean-to-fouled filter resistance. Normal and maximum credible cases should be stated at the same blower-inlet reference conditions.
The maximum credible case should represent a foreseeable operating condition, not a closed discharge. Relief protection and high-pressure shutdown are separate safeguards and should not be included as normal production points.
Gate 5: Issue a Comparable RFQ
The request for quotation (RFQ) should state required blower-inlet volume, differential pressure, inlet temperature and pressure range, material duty, operating hours, speed-control requirement and site altitude. It should ask for model, speed, absorbed power, motor rating, discharge temperature and package accessories at each relevant point.
Responsibility boundaries should be explicit. The conveying-system designer normally owns material throughput and route resistance. The blower supplier owns the declared package performance when operated at the agreed inlet conditions and within the selected model limits.
Gate 6: Approve the Selected Model
Quotations should be compared at the same duty and reference conditions. A model is accepted only when normal and maximum points fall inside its verified performance and power diagrams with suitable speed, temperature and motor margin.
Pasifik Blower applies this final check to positive-pressure two-lobe and three-lobe roots blowers. A gated RFQ turns test data into a procurement document that is auditable, comparable and technically aligned—without asking the blower alone to guarantee the behavior of an unverified bulk material.
Glossary
Acceptance gate: Formal checkpoint that confirms specified evidence meets predefined requirements.
Comparable RFQ: Enquiry that gives all suppliers the same duty, reference conditions and requested performance outputs.
Credible maximum: Foreseeable highest operating duty used for equipment verification rather than an impossible fault state.
Decision record: Controlled document capturing inputs, approvals, rejected options and the basis of a technical choice.
Evidence gate: Review stage that prevents unsupported information from entering the next engineering decision.
Operating region: Range of stable, acceptable conditions rather than one isolated calculated point.
Responsibility boundary: Explicit division between parties accountable for system behavior and equipment performance.