NACE International Standard
Practice For Pipeline Systems

Measurement Techniques Related to Criteria for
Cathodic Protection on Underground or Submerged
Metallic Piping Systems

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1. General
2. Definitions
3. Safety Considerations
4. Instrumentation and Measurement Guidelines
5. Structure-to-Electrolyte Potential Measurements
6. Causes of Inaccurate Measurements
7. Voltage Drops Other Than Across the Pipe Metal/Electrolyte Interface
8. Test Method 1—Structure-to-Electrolyte Potential of Metallic Piping with
Cathodic Protection Applied
9. Test Method 2—Polarized Structure-to-Electrolyte Potential of Metallic Piping
10. Test Method 3—Cathodic Polarization of Metallic Piping


Appendix A: Reference Electrodes (Mandatory)
Appendix B: Net Protective Current (Nonmandatory)
Appendix C: Using Coupons to Determine Adequacy of Cathodic Protection


Figure 1: Instrument connections
Figure 1 (a): Instrument connection (polarity option 1)
Figure 1 (b): Instrument connection (polarity option 2)
Figure 2: Structure-to-electrolyte potential corrections for pipeline current flow
Figure 2 (a): Correction when pipeline current flows toward pipe test connection
Figure 2 (b): Correction when pipeline current flows away from pipe test connection
Figure 3: Polarization decay
Figure 4: Polarization formation

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