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Inspection Programs for Internal Corrosion in Piping

Good corrosion inspection programs utilize database tracking systems and API 570 inspectors to determine the most suscep-tible areas where corrosion may start in a piping system. Programs include both radiography and ultrasonic inspections. Computed radiography, although more expensive to get started, will save money during a program over conventional film radiography. Ultrasonic flaw detection instruments with an A-scan display provide quality results with moderate start up costs. Thickness gages lower startup costs and provide excellent single point reading accuracy, but are not designed with the proper specifications for scanning and sizing of corrosion. Corrosion inspection programs are designed to identify and monitor areas of corrosion to determine the life expectancy of systems, flow rates, inhibitor injection, and operating pressure. A good corrosion inspection program can be established and maintained only by implementing a quality database, well-defined inspection procedures, and personnel training to maintain consistency and repeatability. The goal of this paper shall be to educate personnel establishing corrosion inspection programs.

References

API, API 5L: Specification for Line Pipe, The American Petro-leum Institute, Washington, D.C., 2012.

ASME, ASME Section V: Boiler and Pressure Vessel Code, The American Society of Mechanical Engineers, New York, New York, 2017.

ASTM, ASTM E797/E797M-15: Standard Practice for Meas-uring Thickness by Manual Ultrasonic Pulse-Echo Contact Method, ASTM International, West Conshohocken, Pennsyl-vania, 2015.

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