Blower power calculation – Blower types and efficiency

Table 1. Overview of blower types for aeration of wastewater (USEPA, 2010)

Table 2. Typical efficiencies (USEPA, 2010)

Blower TypeNominal Blower Efficiency (%)Nominal Turndown

(% of rated flow)

Positive displacement (variable speed)40-6550
Multi-stage centrifugal (inlet throttled)50-7060
Multi-stage centrifugal (variable speed)60-7050
Single-stage centrifugal, integrally geared (with inlet guide vanes and variable diffuser vanes)70-8045
Single-stage centrifugal, gearless (high speed turbo)79-8050

Note: values may vary depending on the application


© Seong Hoon Yoon