Many studies have investigated the crude oil separation process's separation mechanisms, size, and design, employing horizontal three-phase gravity separators in depth. There are, however, very few articles on their dynamics, modelling, simulation, and control. Understanding its dynamic behavior will aid in designing and tuning the device that can manage water level, oil level, and gas pressure in response to feeding variations. This scientific project gives a complete mathematical analysis, modelling, and simulation of a crude oil separation process using a horizontal three-phase gravity...