1. Low Shear Agitation

Vessel Shape
  • Low aspect ratio(height:diameter) 0.6:1
  • Tilted dish
  • No internal baffles
Agitator
  • Large – 85% of vessel diameter
  • Slow – max. tip speed 3.8 to 4.0 m/s
  • Off centre – 5% of diameter
  • Variable speed – optimises performance
  • Swept surfaces to avoid burn-on
Mash Transfer
  • Pipework low velocity (<1.5 m/s)
  • No severe directional changes
  • Long Radius bends
  • Mash transfer pump has open impeller and slow speed - less than 1000 rpm
Benefits of the Briggs Approach
  • No ‘balling’
  • No mash degradation
  • Excellent heat transfer
  • Minimised oxygen pick-up
  • No burn-on
  • Homogeneous mix – low colloidal buffer/shear