| Roots-type positive-displacement blower | Commonly used for low-pressure pneumatic conveying, including dilute-phase systems. | Moves a near-fixed volume of air per revolution; discharge pressure depends on system resistance and package design. | Air delivery is related to rotational speed; actual delivered flow changes with operating conditions and leakage. | Check required flow and pressure together, operating temperature, noise, vibration, filtration, and drive arrangement. | Performance curves, allowable operating limits, motor data, noise data, and maintenance instructions. |
| Screw blower | Used in low-pressure process-air duties where continuous operation and energy use are important considerations. | Positive-displacement compression using intermeshing rotors; available pressure capability depends on the design and package. | Provides continuous air delivery; compare performance at the specified inlet conditions and operating point. | Review cooling method, lubricant or oil-free design, part-load control, service access, and total package efficiency. | Certified performance data, control-system details, installation requirements, and service intervals. |
| Multistage centrifugal blower | Suitable for applications requiring continuous airflow; suitability for conveying depends on the system pressure and flow requirements. | Uses rotating impellers to add energy to the air; performance is influenced by speed, inlet conditions, and system resistance. | Flow and pressure vary along the machine performance curve; operation near the approved range is important. | Check the full operating curve, surge or stability limits, inlet filtration, ambient conditions, and control method. | Performance curves, operating envelope, vibration limits, and recommended control settings. |
| High-speed turbo blower | May be considered for high-volume, continuous air duties when its performance curve matches the conveying system. | Dynamic compression; pressure rise is produced by high-speed impellers and depends on the selected design. | Dynamic-machine performance responds to changes in flow and system resistance; verify the minimum and maximum operating points. | Assess turndown, motor and bearing design, cooling, filtration, controls, and site service capability. | Certified flow and pressure curves, turndown data, electrical specifications, and commissioning requirements. |
| Pressure dilute-phase conveying package | Conveys material through a pipeline using moving air; commonly applied where relatively high conveying velocity is acceptable. | Blower supplies air above atmospheric pressure; required pressure depends on the material, pipeline, throughput, and layout. | Airflow must be matched to pipeline velocity and solids throughput to avoid unstable operation or excessive wear. | Specify material properties, conveying distance, bends, elevation, throughput, and acceptable product degradation. | System design basis, equipment sizing assumptions, control sequence, and commissioning criteria. |
| Vacuum conveying package | Moves material toward a receiver under suction; often selected for pickup points or enclosed transfer arrangements. | Blower creates pressure below atmospheric pressure, usually downstream of the conveying line. | Available conveying pressure difference is limited by atmospheric pressure and the system’s operating conditions. | Evaluate receiver filtration, air leakage, dust characteristics, required pickup points, and filter-cleaning method. | Vacuum and airflow data, receiver and filter specifications, and system pressure-loss calculations. |
| Dense-phase conveying package | Designed to move bulk solids at comparatively low conveying velocity using controlled material movement. | Typically relies on a pressure vessel or controlled feeding arrangement; pressure and cycle design are system-specific. | Air demand and delivery pattern depend strongly on the material, vessel size, pipeline, and conveying sequence. | Confirm material test results, throughput, pipeline geometry, batch or continuous operation, and acceptable conveying time. | Material test report, system calculations, cycle description, and agreed performance-test method. |