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Application of Visual and Ultrasonic Testing in the Remediation of Corrosion-Resistant Alloy Pipe for Oil and Gas Production

Duplex stainless steels, austenitic stainless steels, and nickel-based alloys used in the oil and gas industry are resistant to atmospheric corrosion in most industrial environments. However, corrosion may result from surface damage that often occurs during storage and transportation. A thorough visual inspection should therefore be performed prior to the pipe entering service. Where the damage has resulted from contact with a noncorrosion-resistant steel, foreign material embedded in the surface may form rust. Embedded rust may act as an initiation site for further corrosion or create a stress riser where stress corrosion cracking could initiate, resulting in a catastrophic failure. This article explains the difference between embedded rust and superficial rust, a technique for remediation, and postremediation inspection of pipe for oil and gas production.

References

API, 2010, API SPEC 5CRA: Specification for Corrosion-resistant Alloy Seamless Tubes for Use as Casing, Tubing, and Coupling Stock, first edition, American Petroleum Institute, Washington, DC.

API, 2018, API SPEC 5CT: Specification for Casing and Tubing, tenth edition, American Petroleum Institute, Washington, DC.

ASNT, 2016, Recommended Practice No. SNTTC- 1A: Personnel Qualification and Certification in Nondestructive Testing, 2016 edition, The American Society for Nondestructive Testing, Columbus, Ohio.

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