This work is designed to present the results achieved by the implementation of a cleaning pig pass program in Petrobras pipelines at the Southeast region of Brazil. Inner pipeline corrosion generally can be found more intensively at the lower generatrix of liquid pipelines. It happens, due to the accumulation of water and residues at lower sectors of pipelines, in particular due to low flow rates or intermittent operation. The use of cleaning pig allows free water and residues to be removed from the pipeline. The effect of reduction corrosion rates may be verified both by the quantity of water and residues collected at the pig receivers and also by the corrosion rates measured using weight-loss coupons. The results achieved indicated a considerable reduction in corrosion rates with the use of cleaning pigging, especially in pipelines that transport oil or products containing water (free, emulsion or dissolved).

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