A Mud Agitator is used in surface mud systems to suspend solids and maintain homogeneous mixture throughout the system. A mechanical agitator is driven by an explosion-proof motor, coupled to a gear box that drives the impeller shaft. The impellers (turbines) transform mechanical power into fluid circulation or agitation. The objective is to obtain a uniform suspension of all solids.-wiki
Following are points about liquid/gas separation.
A degasser is a device used in drilling to remove gasses from drilling fluid which could otherwise form bubbles.-wiki
The purpose of a degasser is to remove entrained gas from the drilling
fluid. By this definition, then, the degasser has a limited capability for
handling large quantities of gas—typically anything more than about
50–100 scfm (20 scfm of gas at surface pressure will gas-cut 400 gpm of
16-ppg drilling fluid to 10 ppg). Large volumes of gas need to be
removed first by a separator or gas buster.