A semi-empirical correlation, based on the concepts of a critical Weber number and Kolmogoroff’s theory of isotropic turbulence, was suggested by Parthasarathy et al. (1991) to estimate the bubble Sauter mean diameter d32 in aerated stirred vessels, in a non-coalescing environment. The correlation was shown to be sufficiently reliable using experimental bubble size data for two-radial flow impellers in a 0.195 m diameter tank. In the present paper, the validity of the correlation is corroborated further, using a range of impellers, in standard stirred tanks of two sizes. The maximum bubble diameter d(max), which is defined as the diameter that is larger than 99% of all the diameters in the cumulative number distribution of bubbles, is found to be linearly related to d32. The d32/d(max) ratio is shown to have an average value of 0.785, and is independent of the level of agitation.