RP0200-2000
NACE International 17
EXAMPLE B3
P/S Pot. C/S Pot. Potential Diff.
Initial Readings 1.246 1.242 0.0040
Step 1 6.0 Volts 0.234 Amps 1.211 1.195 0.016
Step 2 18 Volts 0.594 Amps 1.050 0.9800 0.070
Step 3 30 Volts 1.00 Amps 0.7960 0.7100 0.086
Step 4 45 Volts 1.20 Amps 0.6100 0.5400 0.070
Step 5 75 Volts 2.00 Amps 0.1350 0.1000 0.035
Conclusion: Casing is shorted.
NOTE: During this test, current is being discharged from the casing and this could result in creating an interference
condition with other structures.
6. Use of Pipe/Cable Locator
The presence and location of a pipe-to-casing metallic contact may also be approximated by following a low-power audio or
radio signal (pipe locator trace) set between the pipe and the casing. The signal returns at the point of contact, which should
be verified from the opposite end.
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