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conducted detailed experimental investigations to evaluate the im-Slug flow can be mitigated by slug catchers or by some flow conditioning techniques. Another way to handle such fluctuations in gas and liquid flow rates and to avoid unplanned shutdowns of the production system is by having appropriate control strategy of downstream process equipment. Performance of the conventional feedback control system by manipulating the upstream control valve, in order to maintain the level in the GLCC, is not com-pletely sufficient during the onset of severe slugs. A feedback controller reacts only after it has detected a deviation in the value of the output from the desired set point. So it makes perfect sense if one can estimate the disturbance that is coming into the system and provide suitable control action in order to negate the effect of the disturbance. This is the main principle of the feed forward control system. Several studies were conducted to characterize the slug in two-phase flow. Andreussi et al