Impellers Tm (sec) kLa at 40 lpm kLa at 70 lpm
  Rushton Impeller 5.5 135 141
  Marine Impeller 7.9 72 78
  A320 Impeller 10.5 85 90
  HE3 Impeller 11.5 65 70
Table 2: Average kL a values for different Impellers at Gas Flow Rate of 40 lpm and 70 lpm.