000			01821nab a2200181 4500
005			20260522181310.0
008			260224s2010 xxu
100	1		_aSong, F.M. _924976
245	0	0	_aField Procedures to Estimate Corrosion Potentials and Rates and Cathodic Protection Penetration Limit in a Coating Disbonded Region on Buried Pipelines
260			_cmar. 2010
270			_a20/07/2010 ; 20/07/2010
300			_a12 p. ; 035005
520			_aTranscripción del resumen del autor. No field method or procedure exists to measure the effectiveness of cathodic protection (CP) in a coating disbonded region on buried pipelines; however, gaining this capability can be useful to assist the pipeline industry in better control of the pipeline external corrosion. This paper reports two field procedures to estimate the corrosion potentials and rates in a coating disbonded region on buried pipelines and a method to estimate the maximum distance that CP current can penetrate into a coating disbonded region from the holiday. The above estimates can be accomplished through the use of sampled near-pipe soil chemistry, measured pipe native or rest potential, CP "instant-off" potential, and a corrosion rate of the pipe steel measured in simulated soil groundwater in deaerated condition. The field procedures can be implemented without the need of excavations to expose the pipeline surface. The corrosion rates thus determined can be used to assist in prioritizing corrosion susceptible locations along a pipeline segment and determining the re-inspection interval at a given location. These field procedures are not developed for estimating pit or crack growth rates, if present, in the disbonded region.
581			_a3
773	0		_tCorrosion _g66
942			_cARTICULO _2ddc
999			_c175119 _d175119