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07172 Through-Wall Radiography to Locate and Evaluate Internal Corrosion in Piping

Picture for 07172 Through-Wall Radiography to Locate and Evaluate Internal Corrosion in Piping
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This paper describes use of through-wall radiography to produce the information required to determine the integrity of corroded piping, and includes examples of its use in various situations.

Product Number: 51300-07172-SG
ISBN: 07172 2007 CP
Author: Joseph M. Galbraith, George Williamson, and Michael Creech
Publication Date: 2007
Industries: Oil and Gas Production , Corrosion Monitoring and Control
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In many piping circuits carlying corrosive products, the most likely form of internal damage is localized pitting. Unfortunately, it can be difficult to locate corrosion of this type with cost-effective non-destructive testing (NDT) techniques. Compression wave ultrasonics is used extensively, typically in spot inspections referred to as TML (thickness monitoring location) testing, but surveys of this type frequently fail to locate isolated pitting. A technique used for decades in oil fields and production facilities employs radiography to locate such damage. ' Not only is it possible to locate internal pitting damage with this method, but it is also possible to semi-quantitatively evaluate the depth of pitting and characterize the aspect ratio of corrosion networks This method allows the operator to quickly ascertain the significance of internal damage on the integrity of the pipe by using the information extracted from the radiographic image in a method such as the ASME B31G. Manual for Determining the Remaining Strength of Corroded Pipelines. This paper describes use of through-wall radiography to produce the information required to determine the integrity of corroded piping, and includes examples of its use in various situations.

In many piping circuits carlying corrosive products, the most likely form of internal damage is localized pitting. Unfortunately, it can be difficult to locate corrosion of this type with cost-effective non-destructive testing (NDT) techniques. Compression wave ultrasonics is used extensively, typically in spot inspections referred to as TML (thickness monitoring location) testing, but surveys of this type frequently fail to locate isolated pitting. A technique used for decades in oil fields and production facilities employs radiography to locate such damage. ' Not only is it possible to locate internal pitting damage with this method, but it is also possible to semi-quantitatively evaluate the depth of pitting and characterize the aspect ratio of corrosion networks This method allows the operator to quickly ascertain the significance of internal damage on the integrity of the pipe by using the information extracted from the radiographic image in a method such as the ASME B31G. Manual for Determining the Remaining Strength of Corroded Pipelines. This paper describes use of through-wall radiography to produce the information required to determine the integrity of corroded piping, and includes examples of its use in various situations.

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