Cathodic Protection Measurements for Buried Mixed-Metal Structures - CANCELLED (C2026-00393)
CANCELLED
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In the cathodic protection industry, there are many cases whereby the protected structure is also tied to copper metal, whether related to intentional electrical grounding and bonding, or many times related to accidental tie-in with grounding or with the AC power neutral system. A new device has come to the market, allowing measurements on both carbon steel and copper coupons in relation to a stationary reference cell. Case studies and data sets will be described showing discrete measurements on each metal for native or unprotected voltages, for CP current-applied and current-interrupted voltages, and the DC current densities measured on each type of metal. This work can provide better understanding of the percentage of CP current actually being delivered to carbon steel structures, versus what current is being taken by the various copper structures. The use of these methods may help show patterns of carbon steel under-protection and how DC de-coupling may help improve the situation. Further, if copper can be de-coupled, CP anode beds may last longer, resulting in meaningful cost savings.
