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 




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Difference between a Turbo and Positive Displacement Blower