Close-Interval Survey
Detailed potential survey for evaluating CP levels along a route.
CP Survey Methods Overview
Cathodic protection surveys collect field evidence about potentials, current flow, coating condition, and interference. This overview now points to the dedicated survey-methods hub for deeper study.
Core Survey Categories
DCVG Survey
Coating-defect location using DC voltage gradients.
ACVG Survey
Coating-fault location using AC signal leakage.
CP Coupons
Representative exposed metal samples for potential, current density, and depolarization measurements.
Current Requirement Testing
Temporary-current testing for design and troubleshooting.
Interference
DC, AC, and telluric effects that can distort survey results.
Study Sequence
- Learn structure-to-electrolyte potential measurements.
- Learn reference electrode placement and contact requirements.
- Study instant-off and polarization behavior.
- Move into CIS and coating-condition surveys.
- Then study interference, because interference is where simple interpretations often fail.