Pipeline

Posted on: July 29th, 2011 by jjones

NACE International Standard
Practice For Pipeline Systems

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

Click Here For Document

Contents

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

References

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

Bibliography 

FIGURES:
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