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Mitigating Corrosion Under Insulation and Supporting the Longevity of Industrial Pipe Insulating Systems

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Close Interval Survey (CIS)

Last updated: July 19, 2024

What Does Close Interval Survey (CIS) Mean?

A close interval survey is a measurement tool used to examine cathodic protection systems attached to pipelines to ensure adherence to inspection codes and standards. The survey is complete by obtaining voltage measurements at fixed time intervals and pipeline length in reference to an existing grounded electrode.

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Corrosionpedia Explains Close Interval Survey (CIS)

Close interval surveys are performed on underground pipelines. There are three types of close interval surveys: on/off, depolarized and on surveys.

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Synonyms

Close Interval Potential Survey

Pipe-to-soil Survey

Potential Gradient Survey

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