Bubble columns have wide applications in absorption, bio-reactions, catalytic slurry reactions, coal liquefaction; and are simple to operate, have less operating costs; provide good heat and mass transfer. Experiments have been performed for identifying transition regime in a 15cm diameter bubble column with liquid phase as water and air as the gas phase. Glass beads of mean diameter 35 mu m have been used as solid phase. The superficial gas velocity is in the range 0Ug16.3cm/s and superficial liquid velocity in the range of 0Ul12.26cm/s. Solid loading up to 9% (w/v) has been used. Pressure signals have been measured using differential pressure transducers (DPTs) at four different axial locations. Classical analysis (Wallis approach and ZuberFindlay approach), Statistical analysis and Fractal analysis have been used for regime transition identification. Statistical analysis and Fractal analysis have shown almost the same transition points for all the liquid and gas velocities. Effect of solid concentration, liquid velocity and gas velocity over transition regime has also been studied. As the solid concentration is increased it has insignificant effect over transition regime for lower values (<1%), while transition values decrease for higher solid concentration (>1%). (c) 2012 Canadian Society for Chemical Engineering