Nace CP 1 - Correction When Pipeline Current Flows Toward Pipe Test Connection; Pipe-To-Electrolyte Potential Corrections for Pipeline Current Flow

TM0497-2002
NACE International 9
available. This equipment may minimize problems resulting
from spiking effects, drifting of interrupters, and current from
other DC sources.
+
_
PIPE METAL VOLTAGE DROP
PIPELINE CURRENT
PIPE TEST
CONNECTION
REFERENCE
ELECTRODE
VOLTMETER
ADD PIPE METAL VOLTAGE DROP TO PIPE-TO-ELECTROLYTE
MEASUREMENT WHEN CURRENT IS TOWARD PIPE CONTACT
Figure 2a
Correction When Pipeline Current Flows Toward Pipe Test Connection
+
_
PIPE METAL VOLTAGE DROP
PIPELINE CURRENT
PIPE TEST
CONNECTION
REFERENCE
ELECTRODE
VOLTMETER
SUBTRACT PIPE METAL VOLTAGE DROP FROM PIPE-TO-ELECTROLYTE
MEASUREMENT WHEN CURRENT IS AWAY FROM PIPE CONTACT
Figure 2b
Correction When Pipeline Current Flows Away from Pipe Test Connection
FIGURE 2
Pipe-to-Electrolyte Potential Corrections for Pipeline Current Flow