November 2010 Vol. 237 No. 11

Features

Examining The Controversy Surrounding The -850 mV CP Criteria

The 1992 version of the NACE RP0169 cathodic protection standard (CP) for pipelines[1]introduced two criteria involving a minimum potential of -850mV with respect to a saturated copper-copper sulfate reference electrode (cse). The introduction came after about seven years of often rancorous debate between the NACE T-10-1 committee on criteria and some pipeline industry representatives. A -850mVcse polarized potential criterion, typically measured as an instant-off potential, when the cathodic protection current is interrupted, was included along with the original -850mVcse “current-applied” criterion. This was a dramatic departure from the previous RP0169 versions,

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