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50 mV As a Screening Criteria for Shorted Casings – Case Study

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While performing cathodic protection surveys, carrier pipe and casing potential readings are typically recorded at the same test station location near the end of a casing. Comparing these potentials should reveal a difference between the cathodically protected pipe versus an unprotected and electrically isolated casing. The difference in potentials is one of available tests to determine whether a casing may be electrically shorted to the carrier pipe. The pipe-to-electrolyte and casing-to-electrolyte potential comparison is usually the initial “screening” method.

Product Number: 51323-18899-SG
Author: Keith Parker, Len Krissa, Kris Hoisington
Publication Date: 2023
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AMPP SP-0200-2014 Steel Cased Pipeline Practices is the industry consensus guidance document detailing techniques to screen for and evaluate cased crossings for shorts. The Standard Practice (SP) provides various non-mandatory monitoring techniques that may be applied to evaluate the presence of a shorted condition.
This abstract provides a case study by one pipeline operator and their decision to utilize 50 mV as a potential screening criterion for shorted casings.

AMPP SP-0200-2014 Steel Cased Pipeline Practices is the industry consensus guidance document detailing techniques to screen for and evaluate cased crossings for shorts. The Standard Practice (SP) provides various non-mandatory monitoring techniques that may be applied to evaluate the presence of a shorted condition.
This abstract provides a case study by one pipeline operator and their decision to utilize 50 mV as a potential screening criterion for shorted casings.

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