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Picture for 02111 NEW CP CRITERIA FOR ELIMINATION OF...
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02111 NEW CP CRITERIA FOR ELIMINATION OF THE RISKS OF AC CORROSION AND OVERPROTECTION ON CATHODICALLY PROTECTED PIPELINES

Product Number: 51300-02111-SG
ISBN: 02111 2002 CP
Author: Yuji Hosokawa, Fumio Kajiyama, and Yasuo Nakamura
Publication Date: 2002
$20.00

New cathodic protection (CP) criteria were developed based on AC and DC current densities measured using coupons. Using these criteria, the design of CP systems for newly constructed pipelines, paralleling high voltage AC power lines, and  DC rail transit systems, was successfully performed.
Picture for Cathodic Protection of Stainless Steel 316L Rotating Screens on Seawater Intake Structures
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51317--9362-Cathodic Protection of Stainless Steel 316L Rotating Screens on Seawater Intake Structures

Product Number: 51317--9362-SG
ISBN: 9362 2017 CP
Author: John Norris
Publication Date: 2017
$20.00

This paper will focus on design parameters required for cathodic protection (CP) of stainless steel screens with particular attention on design and operational current density values and suitable protection criteria. The detrimental effects of overprotection will also be discussed. 

 
Picture for CATHODIC OVERPROTECTION AND INTERFERENCE CONDITION ON A GAS TRANSPORTATION PIPE ENCASED IN A CASING PIPE IN THE PRESENCE OF WATER IN THE ANNULUS
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51318-11118-Effect of protective casing on the cathodic protection condition of a buried pipeline at rail crossi

Product Number: 51318-11118-SG
Author: Andrea Brenna / Fabio Brugnetti / Beatrice Refraschini / Silvia Beretta / Marco Ormellese
Publication Date: 2018
$20.00

At rail crossings and parallelisms, pipes for liquid and gas transportation shall be encased in a coated steel casing pipe. Laboratory tests investigate the protection and interference condition of carrier pipe and the casing where water is in the annulus.
Picture for Can an Intermittent Cathodic Protection System Prevent Corrosion of Buried Pipeline?
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Can an Intermittent Cathodic Protection System Prevent Corrosion of Buried Pipeline?

Product Number: 51317--9353-SG
ISBN: 9353 2017 CP
Author: Marco Ormellese
Publication Date: 2017
$20.00

In this paper, a preliminary study of the effect of intermittent CP has been carried out in order to investigate the effect of a temporary current interruption on the potential monitoring and on the residual corrosion of the metal.

 
Picture for Effective Pipeline Corrosion Monitoring in Regions Impacted by External DC Polarization Factors
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Effective Pipeline Corrosion Monitoring in Regions Impacted by External DC Polarization Factors

Product Number: 51324-21132-SG
Author: Angel R. Kowalski; Jason Charles Land; W. Brain Holtsbaum
Publication Date: 2024
$40.00
Effective pipeline external corrosion control can be achieved by maintaining an adequate balance between the coating condition and the cathodic protection level. When a pipeline is in a corridor shared with parallel buried pipelines and high voltage alternating current (HVAC) power transmission lines, determining the adequacy of the cathodic protection (CP) system becomes a challenge. Misinterpretation of data being collected, or unreliable data can lead to the implementation of either ineffective or excessive mitigation programs for these pipelines. To obtain a better representation of the year-round performance of the CP system, additional testing to the conventional adjustive survey or close interval potential survey (CIPS or CIS) might be required on transmission pipelines collocated in HVAC corridors. The variation of the structure-to-electrolyte potential values over time and the effect of polarization cell replacement (PCR) units should be assessed when determining the level of polarization of the pipeline. Data from a case study is analyzed to illustrate additional testing procedures required to minimize the effects of HVAC systems when monitoring the CP level on transmission pipelines. The proper interpretation of the field monitoring data allows pipeline operators to develop and implement effective corrosion control mitigation plans.
Picture for Yeah, Examining the Impact of Overprotection on AC Corrosion: A Case Study Investigation
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Yeah, Examining the Impact of Overprotection on AC Corrosion: A Case Study Investigation

Product Number: 51324-20877-SG
Author: Ivano Magnifico
Publication Date: 2024
$40.00
The risk of AC corrosion has always been linked in particular to the parallelisms of underground pipelines with HVAC lines, especially in those geographical areas where the morphology of the territory creates obligatory so-called "technological corridors", and therefore forces the coexistence of different services over long distances. More recently, the greater diffusion of AC-powered railway networks has further increased the AC interfering sources, while the use of more performing coatings on underground pipelines has on the one hand increased their insulation from the surrounding soil, and on the other has increased the risk of overprotection compared to old, less performing, or more degraded coatings. This paper, starting from a real case found in a gas distribution network in a European big city, will present the normative criteria to be used to keep the AC corrosion risk under control, and will highlight how precisely the simultaneous presence of cathodic overprotection may result in an autocatalytic cycle leading to accelerated AC corrosion, in which monitoring becomes essential in order to be able to carry out on time the appropriate corrective actions.
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