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Cathodic Inspection and Testing For Piping

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Cathodic Inspection and Testing For Piping
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Open: Cathodic Inspection and Testing for Piping

The effectiveness of cathodic protection or other corrosion control measures can be affirmed by visual observation, measurements of pipe wall thickness, or by use of internal inspection devices. Because such methods sometimes are not practical, meeting any criterion or combination of criteria in this chapter is evidence that adequate cathodic protection has been achieved. When excavations are made for any purpose, the pipe should be inspected for evidence of corrosion and/or coating condition. Apply sound engineering practices to determine the methods and frequency of testing required to satisfy these criteria.

• INSPECTION PROCEDURES AND CRITERIA
• APPLICABILITY
• CRITERIA
• STEEL AND CAST IRON PIPING
• NEGATIVE (CATHODIC) POTENTIAL
• NEGATIVE POLARIZED POTENTIAL
• BARE OR INEFFECTIVELY COATED PIPELINES
• WHEN A PIPELINE IS ENCASED IN CONCRETE
• ALUMINUM PIPING
• COPPER PIPING
• DISSIMILAR METAL PIPING
• OTHER CONSIDERATIONS
• DETERMINING VOLTAGE DROPS
• SOUND ENGINEERING PRACTICES
• IN-LINE INSPECTION OF PIPES
• STRAY CURRENTS AND STRAY ELECTRICAL GRADIENTS
• ALTERNATIVE TO SATURATED COPPER / COPPER SULFATE
• ALTERNATIVE METALLIC MATERIAL OR STRUCTURE
• POTENTIAL MEASUREMENT
• ALTERNATIVE REFERENCE ELECTRODES
• TESTING