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Solving Challenges in CP and Coating Surveys Through Technology Advancements

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Pipelines are laid in the harshest of environments. From enduring extreme heat in sandy environments to sub-zero temperatures near the Arctic Circle, pipelines have primarily two layers of defence – Coating and Cathodic Protection (CP), for managing the external integrity.


Majority of the traditional aboveground CP and Coating survey techniques being utilized in the industry are offered with several hurdles – the most important being the authenticity of the datasets being collected.

Product Number: MECC23-20064-SG
Author: Ashish Khera, P.Eng., Himanshu Joshi, Mohamed Ramadan, Bidyut Baniah C.Eng., Wael Bata
Publication Date: 2023
$20.00
$20.00
$20.00

Non-intrusive assessment of pipeline Coating and Cathodic Protection (CP) is performed by utilising aboveground surveys, also known as Indirect Inspection. However, there have been two major advancements with these Indirect Inspection survey techniques – (1) Combining multiple aboveground surveys into a single GPS integrated dataset for automatic alignment, better correlation and accuracy, (2) Encrypted recording of raw logs to prove the authenticity of the obtained datasets. Integrated Inspection Techniques (IITs) have the ability of combining up to nine (9) different surveys – CIPS, DCVG, CAT, ACVG, DOC, AC-PSP, Soil Resistivity, Gas-Leak and GPS. All these surveys are conducted by walking only once over the pipeline and the surveys record datasets continuously at up to 35 times per second. Encrypted data is auto-integrated and recorded by the equipment, and further analysed on the viewable software for assessing the pipeline’s external integrity. This paper discusses the direct and indirect results from IITs from field experiences.

Non-intrusive assessment of pipeline Coating and Cathodic Protection (CP) is performed by utilising aboveground surveys, also known as Indirect Inspection. However, there have been two major advancements with these Indirect Inspection survey techniques – (1) Combining multiple aboveground surveys into a single GPS integrated dataset for automatic alignment, better correlation and accuracy, (2) Encrypted recording of raw logs to prove the authenticity of the obtained datasets. Integrated Inspection Techniques (IITs) have the ability of combining up to nine (9) different surveys – CIPS, DCVG, CAT, ACVG, DOC, AC-PSP, Soil Resistivity, Gas-Leak and GPS. All these surveys are conducted by walking only once over the pipeline and the surveys record datasets continuously at up to 35 times per second. Encrypted data is auto-integrated and recorded by the equipment, and further analysed on the viewable software for assessing the pipeline’s external integrity. This paper discusses the direct and indirect results from IITs from field experiences.

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Coating Anomaly Detection with Integrated Indirect Inspection Tools

Product Number: 51319-12810-SG
Author: Chukwuma Onuoha
Publication Date: 2019
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Assessment of the external coating condition of underground pipelines depend on the use of approved external corrosion direct assessment (ECDA) indirect inspection techniques such as alternating current voltage gradient (ACVG) alternating current attenuation (ACCA) and direct current voltage gradient (DCVG). Efficient application of these techniques (especially ACVG and DCVG) to ensure optimal detection and prioritization of coating anomalies largely depend on a myriad of factors including: depth of cover probe spacing current level and soil resistivity.Research and industry experience have shown that normalization of key factors such as current level probe spacing and depth of cover led to accurate detection and prioritization of coating anomalies for ECDA and coating assessment projects. However there have been scenarios where known coating faults have not been detected with DCVG and ACVG even when key factors were considered during the indirect inspection.This paper will present case studies that showcase instances where the optimization of coating anomaly detection and prioritization methodologies led to a successful execution on ECDA projects and prevented unnecessary pipe bell-hole excavations. In addition lessons learned from scenarios where known coating faults were not detected with voltage gradient surveys will be presented.Key Words: Pipeline Integrity ACVG DCVG ACCA Cathodic Protection Indirect Inspection ECDA Pipeline Integrity Management Program.
Picture for 51317-9520-Pipeline Casings – Management of Pipeline Casing Issues
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51317-9520-Pipeline Casings – Management of Pipeline Casing Issues

Product Number: 51317-9520-SG
ISBN: 9250 2017 CP
Author: Jeffrey L. Didas
Publication Date: 2017
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Pipeline casings can be or are a problem. This paper will discuss the issues with casings, introduce one way of managing a casing program and offers some solutions to the casing management issue.

 
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ACVG or DCVG - Does it Matter?

Product Number: 51317--9374-SG
ISBN: 9374 2017 CP
Author: Jim Walton
Publication Date: 2017
$20.00

This paper will point out when and why to use either Direct Current Voltage Gradient (DCVG) or Alternating Current Voltage Gradient (ACVG) surveys, including what the criteria of percent IR and Decibel microvolt (dBµV) really mean when conducting these survey techniques.

 
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