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Introduction: Performance Testing ensures that the plant operates according to its intended functionality and guaranteed parameters. It maximizes plant efficiency, reduces emissions, and minimizes operating costs by identifying any inefficiencies or capacity limitations and providing recommendations for recovery and performance improvement. Cold Air Velocity Test (CAVT): In boilers, the flue gas flow pattern in the second pass may lack uniformity due to combustion behavior, fouling tendencies, and configurations such as Gooseneck. This non-uniformity leads to uneven heat transfer in tube bundles and erosion of tube bundles in high-velocity zones. CAVT is conducted to assess the flue gas flow pattern by mapping the velocities measured across the top planes of different crosssections in the Boiler's second pass and the coefficient of variation (COV) in velocity is calculated to access the condition of the flow pattern. Clean Air Flow Test (CAFT): CAFT is performed as per ...