December 2011, Vol. 238 No. 12

Features

Review Of CP Criteria In Five Standards

(Editor’s Note: Tables 3A through 3E and a list of literature references are not included here due to space constraints. They are available from the author. E-mail: fsong@swri.org.) Cathodic potential (CP) criteria are used as a recommended minimum requirement for controlling external corrosion of buried or submerged steel piping systems. Different and sometimes conflicting CP criteria are given in different global CP standards. This can lead to confusion regarding what criterion is best used for a given condition. This article is aimed at reviewing all historical versions of recommended practices/standard practices (RP/SP) of the CP criteria in NACE Standard RP/SP 0169

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