NACE 35108 PDF

This NACE International technical committee report is intended for use by engineers during evaluation of criteria for levels of cathodic protection (CP). Throughout this report, reference is made to pertinent available standards. Of particular relevance are NACE SP01691and TM04972 for pipelines, as well as numerous other standards for other types of structures, some of which are listed in the Summary section of this report. The report discusses the theoretical basis for the 100 millivolt (mV) cathodic polarization criterion, the effects of other factors such as temperature, mill scale, moisture, and anaerobic bacteria, measurement of the polarization, and the applicability of the criterion in situations such as areas susceptible to stress corrosion cracking, mixed-metal systems, and areas susceptible to stray currents. It also includes the results of an industry questionnaire on the use of the 100 mV polarization criterion and opinions on its effectiveness. This technical committee report was prepared by Task Group (TG) 211—Cathodic Protection: Report on the Application of the 100 mV Polarization Criterion. This TG is composed of corrosion researchers, corrosion engineers, corrosion consultants, facility owners, and representatives of both industry and government. TG 211 is administered  by Specific Technology Group (STG) 35—Pipelines, Tanks, and Well Casings. It is also sponsored by STG 05— Cathodic/Anodic Protection. This technical committee report is issued by NACE International under the auspices of STG 35.