AMPP Store - Products tagged with 'dc interference'

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AMPP Guide 21569-2024, Guidance on Implementing Corrosion Control Methodologies to Align with New PHMSA Regulatory Procedures

Product Number: AMPP Guide 21569-2024

Publication Date: 2024

$109.00

In August 2022, the United States Department of Transportation Pipeline and Hazardous Materials Safety Administration (PHMSA) revised the Federal Pipeline Safety Regulations to improve the safety of onshore gas transmission lines. PHMSA expects the new requirements will reduce the frequency and consequences of failures and incidents involving onshore natural gas transmission pipelines through earlier detection of threats to pipeline integrity, including those resulting from corrosion or extreme weather events. Additionally, revisions to the regulations address several other areas, including management of change processes, corrosion control, and criteria to repair pipelines. New corrosion control regulations were incorporated into the following sections of the United States Code of Federal Regulations (CFR) Title 49, Part 192, Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards: 192.319, 192.461, 192.465, 192.473, and 192.478. Additionally, revisions to Sections 192.485 and 192.714 include remedial measures for transmission lines impacted by corrosion.

PHMSA’s Regulation Identifier Number (RIN) 2137-AF39 entitled “Pipeline Safety: Safety of Gas Transmission Pipelines: Repair Criteria, Integrity Management Improvements, Cathodic Protection, Management of Change, and Other Related Amendments” (also known as RIN 2 or the Gas Mega Rule) increases pipeline safety regulatory requirements in 49 CFR 192 for operations, maintenance and integrity management.

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Case Study - DC Potential Influence Investigation via Waveform Analysis

Product Number: 51324-21149-SG

Author: Marc Blouin; Darrell Cornet

Publication Date: 2024

$40.00

While conducting overline surveys including Close Interval Survey (CIS), Alternating Current Voltage Gradient (ACVG), Direct Current Voltage Gradient (DCVG), Alternating Current Current Attenuation (ACCA) and Depth of Cover (DoC) in the Southeast Saskatchewan, Canada, a section of the cross Canada/US border Alliance pipeline, an unexpected CIS potential was encountered whereby potential measurements dipped, falling below the -850mV potential criteria, before rising again back into the range before the drop. The location of the potential drop occurred at a foreign crossing thus stray current was initially suspected. The field crew remained nearby while the foreign crossing owner representatives were notified of a possible interaction requiring further investigation. An interruption and influence analysis plan was put together to determine the nature of the influence on the Alliance DC Potential measurement circuit. This paper summarizes the preliminary analysis and test plan, the field measurements, and results.

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Field-Testing Procedures on a Metallic Pipeline Collocated with an HVDC Powerline

Product Number: 51323-19035-SG

Author: Andrew Mackey, Alex Ristow

Publication Date: 2023

$20.00

Development of this strategy began after a steel pipeline, coated with Fusion Bonded Epoxy (FBE), was constructed in a collocated right-of-way (ROW) with a high voltage direct current (HVDC) Powerline. Area Cathodic Protection (CP) Technicians reported challenges in recording stable DC Pipe-to-Soil (P/S) Potentials due to rapid fluctuations observed in the DC waveform. In addition, CP technicians recorded DC line current concurrently with P/S potentials and found that there was a correlation between the two.

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Improving the Quality of ECDA Indirect Inspection Data

Product Number: 51317--9038-SG

ISBN: 9038 2017 CP

Author: Sorin Segall

Publication Date: 2017

$20.00

The quality of indirect inspection data is critical in an External Corrosion Direct Assessment (ECDA). The need exists to increase the accuracy of the field data collection, to improve the data processing and to effectively present the results. This paper describes several challenges.

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Integrated Corrosion Analysis Software and its Application to dc Corrosion Analysis

Product Number: 51323-18819-SG

Author: F. P. Dawalibi, J. Cheng, Y. Jiang,

Publication Date: 2023

$20.00

When a metal or metal alloy is immersed in an electrolyte made of a conducting material of sufficient oxidizing power, such as moist soil, it will corrode according to a well-defined electrochemical mechanism. dc corrosion is a result of dissolution of material due to oxidizing reactions, liberating electrons and forming positive ions transported into the electrolyte, leading to material loss. The current-potential relationship governing this electrochemical process termed polarization, is non-linear. This relationship is often represented by a polarization curve, which is typically, an experimentally determined function. There are a number of parameters that can contribute to the final characteristics of the polarization curve within a system ranging from material parameters (e.g. material, geometry) to environmental factors (e.g. composition of the electrolyte).

Products tagged with 'dc interference'

AMPP Guide 21569-2024, Guidance on Implementing Corrosion Control Methodologies to Align with New PHMSA Regulatory Procedures

Case Study - DC Potential Influence Investigation via Waveform Analysis

Field-Testing Procedures on a Metallic Pipeline Collocated with an HVDC Powerline

Improving the Quality of ECDA Indirect Inspection Data

Integrated Corrosion Analysis Software and its Application to dc Corrosion Analysis

Association for Materials Protection and Performance