... density (J_AC and J_DC) on the AC corrosion rate. AC Corrosion AC frequency AC Interference AC Mitigation Cathodic Protection CP Ground Bed Rectifier 120 Hz Frequency Interference Unfiltered Rectifier Corrosion Investigation Pipeline INTRODUCTION A 2018 AC corrosion...

...The design not only provides for the required ICCP system, but also allows for ROV-connectable control functions subsea and an integrated CP monitoring system on the hull. Since the design proposal was modular, there was also flexibility to alter some of the design parameters as detailed design...

... Plasma Spectrometry (Agilent Technologies 5100 ICP-OES; Model# G8011A) was used on both plates to determine their chemical composition and the results are shown in Table 1 . Abstract Secure electrical connections are necessary for all cathodic protection (CP) systems on buried pipelines. Electrical...

...Abstract An especially noteworthy and important analysis will be provided on the real-time field performance of stand-alone vapor corrosion inhibitor (VCI) systems in comparison to cathodic protection (CP) systems on aboveground storage tank (AST) floors. API 653 floor inspection data...

... identified 70 external corrosion anomalies, with two of them exceeding 55% wall loss. An additional five corrosion anomalies had been previously repaired. Recent annual cathodic protection (CP) surveys, and a close-interval potential survey conducted in 2015, all indicate good cathodic protection levels...

...Client suspected one or more electrical contacts (shorts/bonds) somewhere along the pipeline but using conventional above grade survey techniques had been unable to locate any issues. The pipeline did not react to adjustments to the existing CP rectifiers as expected. Abstract This paper provides...

...) and Panasis software (version 1.7.9). RESULTS and DISCUSSION The Open circuit potential (OCP) of each test specimen in the soil slurry under the designed testing load was monitored for 72 hours to allow the OCP and stress load on the steel specimen to stabilize before any CP was applied. The OCP obtained...

...This particular fixed delay is a 500 ms delay and results in a failing “Instant Off” potential. The optimum “Instant Off” potential occurs approximately 250 ms prior to this point and could only be captured using a detailed waveform analysis. CP Data Validity When a technician collects CP data...

...There is currently no standard test methodology for assessing susceptibility of nickel based alloys to hydrogen embrittlement in seawater in the presence of CP. Material selection/specification is usually based on: Chemistry controls Hardness limits Heat treatment control Strength limits...

... and accuracy of data collected. Close interval potential surveys are the backbone of pipeline integrity. They assess the effectiveness of the cathodic protection (CP) system which provides protection against corrosion. Direct current voltage gradient surveys indicate defects or damage in the coating...

...Background CP potentials in electrically connected multiple pipeline corridors are primarily determined through a conventional annual survey process that meets regulatory requirements. The Company supplements these efforts with enhanced system monitoring techniques such as Close Interval Potential...

... completed in 2013. CP cathodic protection logging anode nuclear plant semi-deep groundbed test wells INTRODUCTION CPNPP is a two unit nuclear plant nominally rated at 1,150 megawatts per reactor and is sited in Somervell County north of Glen Rose, Texas. Unit 1 went commercial in 1990 and Unit 2...

... approximately 1:00 am to 5:00 am daily as the trains do not operate during this time period. Remote monitoring data-logging reverse current switch DC transit system interference CP cathodic protection measurement DC voltage AC voltage pipelines INTRODUCTION The purpose of this paper is to explore...

... CP cathodic protection measurement DC voltage AC voltage pipelines isolation flange diode decoupling device INTRODUCTION Induced AC on buried pipelines has garnered much attention in recent years from both a safety concern, and increasingly, concerns regarding pipeline corrosion due to AC...

...Abstract Cathodic protection (CP) current measurement using an in-line inspection (ILI) tool is a technique that provides real-time cathodic protection current data to help operators determine the effectiveness of a pipeline cathodic protection system. This ILI technique compliments all existing...

...Abstract Boundary element analysis (BEA) is an effective and accurate assessment method for modeling large or infinite domains (such as cathodic protection (CP) analysis). The potential and current density were calculated and the distribution trend of the data analyzed. The results...

... and standards comment on shielding, if at all. The paper will also look at independent testing along with manufacturer and user sponsored research into coatings and their electrical interaction. Pipeline Coatings Corrosion Shielding High Dielectric Strength Cathodic Protection CP Codes Standards...

...Abstract Marine structures are frequently monitored or surveyed as part of an ongoing integrity management program to obtain data on corrosion potentials, anode consumption and in some cases field gradients. One objective is to determine how effective the CP system is at providing protection...

... by a CP system. By preventing change of the state of the calcareous deposits during a simulation, it is possible to determine short term currents which will flow before calcareous deposits are formed, or to determine the immediate effects of loss of anode material, i.e. before loss of calcareous...

...CP Modeling Both ICCP concepts were modeled using proprietary software to predict potential distribution and reveal any areas that may be at risk of under- or over-protection. The models raised a few points of attention including: Possible interference with the subsea flowlines and umbilicals...