TM0101-2001
ii NACE International
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NACE International
Standard
Test Method
Measurement Techniques Related to Criteria
for Cathodic Protection on Underground
or Submerged Metallic Tank Systems
Contents
1. General ........................................................................................................................... 1
2. Definitions ...................................................................................................................... 1
3. Safety Considerations..................................................................................................... 3
4. Instrumentation and Measurement Guidelines ............................................................... 3
5. Tank-to-Electrolyte Potential Measurements.................................................................. 4
6. Causes of Measurement Errors...................................................................................... 8
7. Voltage Drops Other Than Across the Tank-to-Electrolyte Interface.............................. 9
8. Test Method 1—Negative 850-mV Tank-to-Electrolyte Potential of Steel
Tanks with Cathodic Protection Applied........................................................................ 9
9. Test Method 2—Negative 850-mV Polarized Tank-to-Electrolyte Potential
of Steel Tanks ............................................................................................................. 11
10. Test Method 3—100-mV Cathodic Polarization of Steel Tanks.................................. 12
11. Test Methods for Continuity Testing of Steel Tank Systems...................................... 17
12. Piping and Appurtenances.......................................................................................... 19
References........................................................................................................................ 19
Bibliography ...................................................................................................................... 19
Appendix A: Using Coupons to Determine the Adequacy of Cathodic Protection............ 21
Figures
Figure 1: Instrument Connections....................................................................................... 6
Figure 2: Cathodic Polarization Curves............................................................................. 15
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