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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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ISBN: 06465 2006 CP
Author: Eric P. Thurston
Publication Date: 2006
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The unavailability of coal fired electrical generating capacity is often attributable to corrosion in steam generators. Electricity demand grows faster than new plants come online, forcing greater use of old plants. Identifying such problems requires proper inspection tools and techniques to take the guesswork out of whether boiler tubes should be repaired or replaced. 

 
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06458 UNDER-DEPOSIT CORROSION MECHANISMS IN BOILERS

Product Number: 51300-06458-SG
ISBN: 06458 2006 CP
Author: A.G. Howell
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Under-deposit corrosion is a common mode of failure in boiler tubes. Mechanisms include phosphate attack, caustic gouging, hydrogen damage, and wall thinning due to metal loss. Many aspects of these mechanisms and their mitigation are well-understood, while certain specific details remain uncertain or subject to controversy.

 
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