In-line Inspection of Pipelines by Using a Smart Pig (ITION) and Multivariate Statistical Analysis MAGDA RUIZ, LUIS EDUARDO MUJICA, MARIO QUINTERO, SERGIO QUINTERO and JOEL FLÓREZ ABSTRACT The ferrous pipe structures of oil and gas production and, the transmission pipelines are, in majority, buried. Nowadays, phenomena like corrosion, mechanical stress, soil erosion, worker mistakes and damages caused by third parts have generated several problems over pipelines. Thus, major investment on integrity programs with In-Line Inspection Tools has been improved in order to examine the pipelines and avoid environmental, financial and social disasters. Recently in Colombia, the Research Institute of Corrosion - CIC (Corporación para la Investigación de la Corrosión) runs their own smart pig ILI tool in pipelines. The inspection technology is based on inertial and operational trends, ITION (Inertial Technology Inspection and Operational Trends). Up to date, the technology has been tested several times inside of pipelines providing valuable information along of thousand kilometres. These records contain a huge amount of data that sometimes is difficult or impossible to understand by themselves. A univariate statistical analysis can be used to determine the thresholds for each observation variable. However, it does not analyse the correlated information between them. In this way, the main contribution of this work is the development of a methodology based on Principal Component Analysis (PCA) to monitor the structure by using the whole available variables gathered by ITION. INTRODUCTION The Oil & Gas industry needs to know the status of their pipelines. Therefore identifying areas where pipe defects, deformations, corrosion products and other mechanical integrity problems appears is an important priority. The proper method to recognize the state of the entire pipe is the internal inspection (in-line inspection - ILI) by the movement of a vehicle instrumented with many sensors. The Research Institute of Corrosion - CIC (Corporación para la Investigación de la Corrosión) developed an instrumented vehicle for inspection of critical losses of metal for pipes of carbon steel using a technique named Magnetic Flux Leakage MFL. M. Ruiz and L.E. Mujica. Escola Universitària d’Enginyeria Técnica Industrial de Barcelona. Consorci Escola Industrial de Barcelona. Universitat Politècnica de Catalunya. BARCELONAtech. Dept. Applied Mathematics III. {magda.ruiz , luis.eduardo.mujica}@upc.edu. M. Quintero, S. Quintero and J. Flórez. Department of Electronics, Research Institute of Corrosion CIC. Colombia. {mquintero , squintero , jflorez}@corrosion.uis.edu.co