Your browser does not support JavaScript!
MIX SCALE – SCALE OF AGITATION

Mix Scale is used to quantify the mixing intensity needed for a given process as well as provide a frame of reference for mixing scale-up.

This 1-to-10 agitation scale is based on the impeller pumping capacity divided by the tank cross-sectional area, resulting in a bulk fluid velocity. This velocity, in feet/minute (ft/min.), then is divided by 6 to obtain the scale of agitation. This simple 1-to-10 scale has been used for decades as a valuable tool for quickly describing mixing intensity.

TYPEDESCRIPTIONMIXSCALETYPICAL APPLICATION

MILD

LITTLE SURFACE MOTION, NO SPLASH, MILD RIPPLE1MOST STORAGE APPLICATIONS.LOW VISCOSITY BLENDING OF LIQUIDS WITH MINIMAL DIFFERENCE IN SPG'S & VISCOSITY. VISCOSITY IN THE RANGE OF 100 CPS AND BELOW. LIGHT SOLIDS MOVING ON TANK BOTTOM, NO SUSPENSION.
2
3

MODERATE

SLOW ROLLING LIQUID SURFACE OCCASIONAL WAVE WITH LITTLE SPLASH4LOW TO MEDIUM VISCOSITY BLENDING WITH SP.G. DIFFERENCE LESS THAN 0.6 WITH VISCOSITIES GENERALLY BELOW 5000 CPS. SOLIDS MOVING OFF BOTTOM BUT NOT SUSPENDED ANYMORE THAN 20% THROUGHOUT TANK. EASY HEAT TRANSFER.
5
6

VIGOROUS

SOME SPLASH WITH BOILING ACTION AT SURFACE, OCCASIONAL VORTEX7MEDIUM VISCOSITY LIQUID/LIQUID BLENDING. SP.G. DIFFERENCE LESS THAN .85 WITH VISCOSITY LESS THAN 10,000 CPS. MODERATELY SUSPENDED SOLIDS THROUGHOUT 75% ON TANK. GOOD HEAT TRANSFER.
8

VIOLENT

SPLASHING AND LARGE WAVE FORMATIONS, ERRATIC VORTEXING9LIQUIDS WITH VISCOSITIES LESS THAN 25,000 CPS WITH SP.G. DIFFERENCE OF 1.0. SOLIDS SUSPENDED TO COMPLETE UNIFORMITY.
10