The energy-saving Biobull® fermenter agitator

Technical specifications

TypePower ratingCurrent ratingNominal speedCirculating rate *)Thrust force
  [kW] [A] [U/min] [m³/h] [N]
BIOE 114G 11 21,5 38 ca. 22.600 ca. 7.000

*) Circulating rate calculated for water, for comparison purposes

Motor 400+/-10% VAC, rated frequency 50 Hz, index of protection IP 54

Dimensions and weights

Propeller diameter 2650 mm or 1500 mm
Required wall opening Chamber lining 600 x 600 mm or core hole 450 mm
Required cover opening
for lifting out the agitator shaft
2200 x 650 mm
Overall weight approx. 1100 – 1500 kg depending on version

The height of the bottom-bearing bracket and the length of the agitator shaft are determined by the tank dimensions.

Installation of Biobull® biogas agitator in fermenters with gas hood and concrete cover
streisal Biobull® for fermenters with gas hood or concrete cover


Parts flushed with gas in the fermenter Stainless steel 1.4571 (V4A)
Parts outside the fermenter Galvanised or painted/coated
Base bearing Silicon carbide mechanical seal
Propeller (Ø 2650 mm) High strength, wear-resistant polymer with steel core
Propeller (Ø 1500 mm) Stainless steel 1.4301 (V2A)


  • ATEX-certified version for use in explosion protection zones 1 and 2
  • Frequency inverter with parameterised safety software (torque limiting, coupling break detection, etc.)
  • streisal "SafeGuard" (optional): automatic torque monitoring and control system
  • Shear-pin coupling as the final predetermined breaking point