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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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This paper will address conditions assessment, test procedures and criteria necessary to make informed decisions on overcoating or not overcoating an aged coating system. It will cover rating of adhesion and film integrity, determination of overcoating risk factors and a selection process for appropriate overcoat systems.
Stray current refers to electric current that flows elsewhere rather than along its intended path. Stray current is a well-known factor in pipeline maintenance and has been discovered to be an important consideration in communication and electric transmission structure maintenance. Corrosion caused by stray current is frequently many magnitudes greater than corrosion that occurs naturally in soil. Stray current may accelerate corrosion on guy anchors of communication towers and electric transmission towers which could lead to reduced service life or catastrophic failure.
In this paper, stray current corrosion risk for galvanized guy anchors is discussed in detail. Identification by structure-to-soil potential measurements is discussed. Stray current case studies are presented. Overall, this paper demonstrates that while stray current corrosion is a significant risk for guyed telecommunication and electric power structures, it can be detected and mitigated. This paper is an overview of the commonly accepted practices of stray current detection and mitigation used today.