OIL & CAUSTIC TO BE REACT TO FORM NEAT SOAP IN MIXER THE VISCOSITY IS 150-1500 cP. WHEN MIXED CONDITION IT IS 150cP.THIS WILL BE TRANFERED AT 15M3. PUMP CAPACITY IS 30M3 4 BAR g.PRESSURE AT DISCHARGE.BUT USING GEAR BOX WE REDUCED TO 15M3.Mixer bottom is cone , bottom nozzle elevation is 1500mm. pump suction and discharge is 80NB. how to select the bottom nozzle size of mixer .