The task of the project was to understand the relation of effect of high pressure on the droplet radius in a multi phase vertical separator. The correlation subjected to different regimes were evaluated and plots were verified with Matlab, proving that with the increase in pressure, the phase viscosity increases which is normally independent of pressure under normal conditions, also we verified that with the increase in pressure the terminal velocity  decreases thus reducing droplet radius which is proportional to the increase in Terminal velocity of the droplet. Also as surface tension is the function of pressure and droplet radius is influenced by surface tension, being inversely proportional to the droplet radius evolution. We concluded our results after analysing Bonds number, Weber number to understand more about deformation evolution but our results are unstaisfactory at the moment.