Application of Cathodic Protection. Junction Box and Resistor Box. Remote Monitoring of Cathodic Protection. Test post.
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Engineering Services. Field Services. As an essential part of corrosion control, the DCVG survey is the most accurate method available to size and locate pipe coating defects.
If a coating is compromised then the pipeline can be at risk of corrosion. The technique is based on measuring the voltage gradients in the soil above a cathodically protected pipeline. The Close Interval Potential Survey CIPS technique assesses the cathodic protection effectiveness over the entire length of the pipeline, not solely at the test points. Cathodically protected pipelines are equipped with permanent test points where cables are attached to the pipeline to measure the pipe-to-soil potential.
This potential should be sufficiently cathodic to ensure adequate corrosion protection. During the CIPS survey, the technician will obtain the direct current pipe-to-soil potentials at regular and consistent intervals to evaluate the CP potentials of the pipeline. To achieve accurate potentials, the technician establishes an electrical connection to the pipeline by means of a trailing copper wire connected to CP test point.
The wire unwinds from a spool as the operator walks the length of the pipeline, and the pipeline potential is measured with a set of reference electrodes at ground level, positioned directly over the pipeline at frequent intervals. GPS and CP potential data is collected while traversing the pipeline to create accurate reference points to find true pipe-to-soil potential along the entire length.
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Cathodic Protection CP Services. Pipeline Surveillance Surveys. Concrete Corrosion Investigations. Pipeline Casing Spacers. Marine Growth Prevention Systems. Reference Electrodes. Barrel Unions. Technical Equipment. CP Transformer Rectifier. DCVG Equipment. CIPS Equipment. Data Loggers. Remote Monitoring. Capability Statement. Data Sheets.
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Log in to your subscription Username. Peer reviewed only Published between: Published from year: and Published to year: Advanced search Show search help. Rock Mechanics Symposium and 5th U. They determine the effectiveness of the cathodic protection system which provides protection against corrosion. Direct current voltage gradient surveys DCVG indicate defects or damage in the coating on the pipeline but do not indicate the level of cathodic protection. CIPS and DCVG surveys have traditionally been undertaken independently making it difficult to correlate coating defects with the level of cathodic protection as indicated by pipe-to-soil potentials.
DCVG & CIPS Pipeline Coating & Cathodic Protection Surveys
A s pipeline survey data increase with the use of close interval potential survey CIPS and direct current voltage gradient DCVG technologies in the cathodic protection CP industry, the way data are visualized has changed to reflect the increased amount of data. Because each stakeholder—pipeline surveyor, analyst, and operator—needs to view and understand the data differently, how the data are formatted also needs to vary. The surveyor is limited to the options available on the instrumentation. The analyst has commercially available and proprietary software that can output several different graphical views, with a goal of optimizing visualization. The pipeline operator and regulators must be able to comprehend the data and make decisions for the continued operation of the pipeline.
Cath-Tech Hexcorder DCVG/CIPS/GPS Close Interval Survey & Voltage Gradient Survey Tool
Engineering Services. Field Services. As an essential part of corrosion control, the DCVG survey is the most accurate method available to size and locate pipe coating defects. If a coating is compromised then the pipeline can be at risk of corrosion.