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Abstract Mud Gas Separators (MGS) play a critical role in controlling gas influx during drilling operations, particularly in riser gas handling scenarios. With the increased focus on riser gas handling operations, it becomes imperative to reassess the efficacy of existing MGS capacity calculation methods. This study provides a thorough evaluation of various factors influencing MGS performance, including fluid properties, operating conditions, and separator design parameters, emphasizing the need for tailored approaches to riser gas handling scenarios. By scrutinizing established methods and formulas, we highlight the necessity of recalibrating parameters such as flow rates, pressure thresholds, and temperature constraints specific to riser environments. The conventional models may fall short in capturing the nuanced dynamics of gas influx management countered in riser drilling operations. Our analysis underscores the importance of capacity verification calculations, offering insights to delineate operational limits. These calculations are instrumental in defining an Influx Management Envelope, guiding Managed Pressure Drilling (MPD) Operations Matrix, or establishing boundaries for riser gas handling operations. By recalibrating existing models and methodologies, we provide robust means to enhance well control, operational safety, and efficiency in the dynamic landscape of drilling operations. Both venting and separation capabilities will be assessed in determining gas rate limitations. The maximum liquid flow rate will be evaluated based on three criteria: liquid level, gas migration, and erosional velocities. All methods and calculations are briefly discussed