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EN Engineering (ENE) completed an AC interference study over 68 miles of an operator’s transmission line. In addition, an ACVG survey of approximately one (1) mile of the pipeline was conducted at the take-off point of the 8” line. As a result of this AC interference study, evidence of elevated AC corrosion risk has not been found on the operator’s pipeline. However, a review of the provided data shows evidence of DC interference due to a nearby foreign rectifier groundbed at the take-off point of the operator’s line.
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CUI is a significant form of corrosion in industrial plants that demands substantial financial resources and attention. Many assets are insulated for various purposes such as heat conservation (operating temperature above 93°C), cold conservation (operating temperature below 10°C), thermal protection (typically above 60°C), process stabilization, and winterizing.
Insulation is also utilized for sound control, condensation control, freeze protection (e.g., heat tracing), and fire protection.
The range of factors affecting the susceptibility of equipment to corrosion under insulation (CUI)are numerous. Some of these factors might be controlled through better design, more robustinstallation procedures, and using better quality coatings. However, there are other risk factors such as operating temperature, material type, and environmental conditions that cannot be easily modified.