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Internal corrosion is one of the major problems affecting the integrity of pipelines and process equipment. For this reason, the internal corrosion monitoring becomes essential to anticipate eventual problems and to select the most appropriate strategy to mitigate the corrosive process. Due to the problems related to the cost, logistics and safety inherent to coupon and electric resistance probe retrieving, it is very important to seek alternatives to the current methods, to optimize the monitoring tasks. The use of non-intrusive equipment to monitor internal corrosion is an alternative that aims at optimizing this step. Additionally, the non-intrusive equipment has easy installation and maintenance, higher data reliability and faster results. These systems consist of estimating the trend of the corrosion rate through devices installed on the external side of pipelines without the need of access fittings, unlike conventional techniques. The great advantage of using this technique is the absence of interventions for components retrieving, minimizing operational risks. To evaluate such equipment, tests were carried out under dynamic conditions, varying the fluid characteristics to verify the speed of response of some commercial devices, always comparing them to conventional methods (coupon and electric resistance probe). Experimental results showed that the trend of measured corrosion rate obtained by the non-intrusive equipment converged with corrosion coupons and electric resistance probe data.

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