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Picture for Variances in Pipeline AC Interference Computational Modelling
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Variances in Pipeline AC Interference Computational Modelling

Product Number: 51319-12985-SG
Author: Gerald Haynes
Publication Date: 2019
$20.00

The AC interference between High Voltage AC (HVAC) power lines and pipelines has been modelled with various software programs all of which have a variety of input data which results in various results and outputs.Important aspects such as the soil resistivity along the pipeline route can have a significant impact on the pipelines coating resistance. This in turn affects both the computed AC voltages and current densities both of which can significantly affect personal safety and corrosion of the pipeline.Therefore the spacing between these field measurements along the pipeline route can have a significant effect on the pipeline integrity. Soil resistivity measurements collected every 1000ft versus every 5280ft (1 mile) can have a dire consequence on the corrosion results and the matter is exacerbated where these soil resistivity measurement values change significantly along the route. The accuracy of the soil resistivity field data relative to the actual routing (wetlands rivers low and high resistivity’s etc.) will also affect the correct placement of the AC Mitigation (grounding) as well as the resistance of the grounding which in turn has a cost implication to the asset owners and/or operators.Other aspects such as the power line LEF/EMF may also be used to “calibrate” the AC Interference especially where load data is absent.This paper addresses the critical importance of collecting adequate data for the AC Interference studies to prevent costly installations and to mitigate the incorrect positioning of AC Mitigation systems due to inadequate information.

Picture for Vessels Replacement Program to Enhance Safety and Reliability
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Vessels Replacement Program to Enhance Safety and Reliability

Product Number: MPWT19-15496
Author: Ahmad M. Al-Abdulqader
Publication Date: 2019
$0.00
Picture for Vintage Pipeline Enhanced Corrosion Management Analysis
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Vintage Pipeline Enhanced Corrosion Management Analysis

Product Number: 51324-21127-SG
Author: Kenton Lawson; Jason Charles Land; Angel R. Kowalski
Publication Date: 2024
$40.00
Vintage pipeline operators face increased regulatory challenges. These aging pipeline systems may have decades of metal loss and coating damage from soil interaction, pressure cycling, thermal stresses, and other physical phenomena that affects the pipeline’s mechanical integrity to make it more susceptible to leaks or ruptures. Aging pipeline systems are candidates for Enhanced Corrosion Management Analysis (ECMA) to effectively mitigate corrosion risks. The ECMA methodology begins with the integration and analysis of available corrosion control monitoring, maintenance, inspection, and assessment data, to identify the need to collect additional data. When all data deemed necessary to conduct ECMA is available, an analysis is conducted to identify the possible causes of corrosion metal loss in the pipeline system, e.g., inadequate cathodic polarization, poor or disbonded coating conditions, electrical shielding, stray current interference, or microbiologically influenced corrosion (MIC). Effective mitigation plans are then developed to address most probable causes of corrosion metal loss and integrated into the corrosion management program. A case study is presented to demonstrate the implementation of ECMA on a vintage pipeline system and the development of a 20-year corrosion mitigation plan to effectively minimize the corrosion risk on the pipeline. The case study also illustrates how engineering economic analysis can be used to guide decision making regarding operational life extension of the asset and how a well-planned corrosion management program can provide cost-effective, safe operation over the lifecycle of the pipeline.