cathodic protection

A close interval survey (CIS) is a preventive action that can help prevent this corrosion before it starts. CIS is one part of a suite of tools used to identify conditions that cause corrosion, allowing you to assess the effectiveness of the cathodic protection (CP) system protecting your pipeline – ensuring it is operating to NACE SP0169 specified standards.

Prevent corrosion before it starts.

Once corrosion is detected in a pipeline, extensive (and costly) remediation programs must be implemented to ensure ongoing safety of your assets, employees, neighbors and the environment. These may include costly replacement or repair of corroded sections of pipeline, a reduction in maximum allowable operating pressure (MAOP) and throughput or an increase in required assessments of your pipeline.

Pipeline operators estimate that the total cost of maintenance of CP systems can be up as much as 15 times lower compared to monitoring and repairing corrosion. A proactive, preventive close interval survey program – including those that conduct annual pipeline surveys – can be a fraction of the cost of a program to survey and remediate corroded pipe.

Regulations prescribe how often pipeline operators must perform an assessment of their transmission pipelines. In the U.S., it is a minimum of every seven years for transmission lines and every five years if the pipe carries hazardous liquids.

Many operators, however, perform CIS assessments more frequently so they can take action to prevent corrosion. Once corrosion is detected, costly repairs or a reduction in MAOP is required which leads to reduced throughput and lower revenue for operators.

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