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51312-01642-100mV Cathodic Protection Criterion-Using of "Instant-On" Potential for ICCP of new structure

Picture for 100mV Cathodic Protection Criterion-Using of "Instant-On" Potential for ICCP of new structure
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Product Number: 51312-01642-SG
ISBN: 01642 2012 CP
Author: Javad Khosravi
Publication Date: 2012
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100mV Cathodic Protection Criterion-Using of "Instant-On" Potential for ICCP of new structure Javad Khosravi1NIOECNo.263 Nejatollahy St.Tehran. IranNowadays application of 100mV criterion is more desirable than other criteria especially for buried structure in high resistivity soils where corrosion potentials may be low. Also since this criterion can be readily evaluated by comparison of two potentials (Normally Instant-off potential and free corroding potential) some errors by monitoring equipments include half cell and potentiometer can be avoidable. According to all relevant NACE standards for assessment of 100mV formation or decay criterion measuring and recording of Instant-off potential is a necessity. For new structure immediately after synchronized energizing an "instant-On" potential can be read. Reasonably the difference between this potential and free corrosion potential refers to IR drop as well as the difference between "instant-On" and steady ON potential is the "net polarization". This paper compares the results by Instant-off method and Instant-On method for buried piping in a big plant. At the same time evaluation of laboratory results is another major subject of this paper.Keywords: Instant on potential Buried piping Cathodic Protection criteria 1. Corrosion supervisor - NIOEC
100mV Cathodic Protection Criterion-Using of "Instant-On" Potential for ICCP of new structure Javad Khosravi1NIOECNo.263 Nejatollahy St.Tehran. IranNowadays application of 100mV criterion is more desirable than other criteria especially for buried structure in high resistivity soils where corrosion potentials may be low. Also since this criterion can be readily evaluated by comparison of two potentials (Normally Instant-off potential and free corroding potential) some errors by monitoring equipments include half cell and potentiometer can be avoidable. According to all relevant NACE standards for assessment of 100mV formation or decay criterion measuring and recording of Instant-off potential is a necessity. For new structure immediately after synchronized energizing an "instant-On" potential can be read. Reasonably the difference between this potential and free corrosion potential refers to IR drop as well as the difference between "instant-On" and steady ON potential is the "net polarization". This paper compares the results by Instant-off method and Instant-On method for buried piping in a big plant. At the same time evaluation of laboratory results is another major subject of this paper.Keywords: Instant on potential Buried piping Cathodic Protection criteria 1. Corrosion supervisor - NIOEC
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