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One of the intrinsic characteristics found in CPL operation is the oscillatory behavior of the pressure drop, even noted under seemingly steady operation. This study focused on the role of the condensing process and its intrinsic instabilities upon the differential pressure oscillations recorded in the CPL. Through an analytical study of condensing instabilities and an experimental study based on the correlation between pressure records and condensing flow visualization, the impact of slug flow phenomenon occurring in the condensing path was investigated. High amplitude oscillations were seen to be linked with liquid slug phenomena in the way that slug striking the final vapor-liquid interface generated pressure pulses.