2010 STUDY OF A DELAMINATION FAILURE IN A THREE LAYER COATING OF A 24” GAS PIPELINE IN VERACRUZ, SOUTH EAST MEXICO. Francisco Fernandez Lagos, 1 Carlos Sanchez Magaña, 1 Miguel Angel Lopez, 1 PEMEX DCO. Torre Ejecutiva, Marina Nacional 329, Col. Huasteca, México, Distrito Federal, C.P. 11311. Jose Padilla, 2 Jorge Canto, 2 William Villamizar, 2 Lorenzo M. Martinez-de la-Escalera, 2 Corrosion y Proteccion Ingeneria, S.C. Rio Nazas 6. Cuernavaca, Morelos. Mexico. 62290. Jorge A. Ascencio 3 , and Lorenzo Martínez 3* Instituto de Ciencias Físicas, Universidad Nacional Autonoma de Mexico, Universidad 1001, Chamilpa, Cuernavaca, Morelos. 62210. Also at Corrosion y Proteccion Ingenieria SC ABSTRACT The three layer pipeline coating system is one of the fastest growing and more accepted systems in the world, in great part due to the combination of the excellent adhesion properties of the FBE, and the excellent water impermeability and mechanical resistance of the HDPE. We report a case study of a disbondment failure occurred at a 24” gas pipeline and the steps taken to try to determine the root cause of the failure. KEY WORDS.- Fusion bonded epoxy, three layer pipeline coating system, cathodic protection shielding, material characterization. ©2010 by NACE International. Requests for permission to publish this manuscript in any form, in part or in whole, must be in writing to NACE International, Publications Division, 1440 South Creek Drive, Houston, Texas 77084. The material presented and the views expressed in this paper are solely those of the author(s) and are not necessarily endorsed by the Association. 1 Paper No. 10003