Multistage Centrifugal Blowers and Exhausters for Air and Gas

Including Biogas, Methane Gas, and Natural Gas, Renewable Natural Gas, and any other Specialty Gas

Multistage Centrifugal Blower, as the name implies, comes in multiple stages ranges from one (1) stage to a combination of stages. One stage of a multistage centrifugal blower is generally made of:

  • an intake duct conveying the gas to the impeller inlet, which shares the same axis as the shaft;
  • a closed impeller with axial flow inlet and radial flow exit;
  • a radial diffuser, whose aim is to convert kinetic energy into static pressure at the impeller exit, and a discharge volute.
 Multistage Centrifugal Blower
 Miltistage Centrifugal Blower


Therefore, it is explained that multistage blowers use the kinetic energy of the internal impellers to increase the volume of the air or other specialty gas (like methane gas, biogas, etc.), which in turn moves them against the resistance caused by ducts, piping, dampers and other components. Multistage centrifugal blowers displaces the air radially, changing the direction of the airflow.

In mutltistage centrifugal blowers, the air or gas is sucked into the first stage through an inlet volute, every next single stage is linked to the former one through a return channel, and a discharge volute collects the gas from the exit of the last stage delivering it to the outlet pipe. The impellers are built with radial exit blades or backward facing blades. The radial blades allow the achievement of a higher compression ratio, whilst the impellers with backward facing blades, at fixed speed of rotation and for the same differential pressure, produce a characteristic curve with a much wider stable range.

 The following chart shows the Duty Range for Biogas Multistage Centrifugal Blowers
Duty Range Multistage Centrifugal Blower 




  1. Waste No Waste: Time to Embrace Biogas
  2. Is Big Gas finally learning to love biogas?
  3. We need to get behind Renewable Natural Gas
  4. Difference between a Turbo and Positive Displacement Blower
  5. The Difference between Methane and Natural Gas
  6. First Dairy Biogas Project in Connecticut
  7. Does Renewable Natural Gas Have a Future in Energy?
  8. Biogas Offtake Opportunities For Digesters
  9. Wisconsin Dairy Begins Production of Renewable Natural Gas
  10. Anaerobic Digestion Sector Forming a Clearer Picture
  11. Brightmark to Expand Western New York Dairy Biogas Project
  12. Biogas - The Energy Wonder That's Under Our Noses
  13. Power Generation Achieved by a Self-Assembled Biofuel Cell
  14. Less Carbon Dioxide from Natural Gas
  15. Project Uses Renewable Electricity for RNG Production
  16. Smithfield Hog Farm Provides Natural Gas to Missouri City
  17. From Waste to Gas
  18. Gas Clash Threatens Australian Export
  19. Maximizing Opportunities of Anaerobic Digestion from Wastewater
  20. Catalyst to Speed up Conversion of Biomass to Biofuel
  21. How It Works: Ethanol
  22. Anaerobic Digestion - the Next Big Renewable Energy Source
  23. Anaerobic Additions
  24. Three (3) Tech Solutions for Modern Landfills
  25. The Costs and Benefits of Anaerobic Digesters
  26. Bacteria Farts Power Wastewater Plant in Fort Wayne
  27. Europe’s First Poultry Manure Biogas Plant
  28. Electricity Using Pig Manure
  29. $38-Million Biodigester coming to Grand Rapids
  30. Biochar Could Benefit Anaerobic Digestion of Animal Manure

For additonal reading, please visit us at: News Worthy

Difference between a Turbo and Positive Displacement Blower