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07037 Use of CP Coupons and Soil Corrosion Probes in Application of Pipeline Cathodic Protection Criteria

Picture for 07037 Use of CP Coupons and Soil Corrosion Probes in Application of Pipeline Cathodic Protection Cri
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Product Number: 51300-07037-SG
ISBN: 07037 2007 CP
Author: Naeem A. Khan
Publication Date: 2007
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Cathodic protection (CP) coupons and soil corrosion probes (SCPs) can be effective tools in applying CP criteria under challenging operating environments. These situations include measuring offpotentials using coupons in cross-bonded systems or structures influenced by interference from CP systems not controlled by the main protected system operator, or where CP potentials cannot be reliably measured and corrosion rate measurements using electrical resistance (ER) soil corrosion probes are used as an alternative to conventional CP criteria for buried pipelines. This paper looks at the various scenarios where CP coupons and SCPs can be used, using field data from installations on buried pipelines, and also with reference to the requirements of the new ISO standard ISO/FDIS 15589-1 on different CP criteria for varying soil resistivities. Information is also given on the recent work by the NACE International Technical Committee TG-321 draft report on soil corrosion probes.
Cathodic protection (CP) coupons and soil corrosion probes (SCPs) can be effective tools in applying CP criteria under challenging operating environments. These situations include measuring offpotentials using coupons in cross-bonded systems or structures influenced by interference from CP systems not controlled by the main protected system operator, or where CP potentials cannot be reliably measured and corrosion rate measurements using electrical resistance (ER) soil corrosion probes are used as an alternative to conventional CP criteria for buried pipelines. This paper looks at the various scenarios where CP coupons and SCPs can be used, using field data from installations on buried pipelines, and also with reference to the requirements of the new ISO standard ISO/FDIS 15589-1 on different CP criteria for varying soil resistivities. Information is also given on the recent work by the NACE International Technical Committee TG-321 draft report on soil corrosion probes.
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A natural gas transmission pipeline is routed through South Texas where cathodic protection levels can vary significantly throughout the year.  This paper discusses the use of precision electrical resistance type corrosion rate probes and remote monitoring of the probe corrosion rate.
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