This paper is a significant update to “Costing Considerations for Maintenance and New Construction Coating Work”1 on protective coating costing and selection co-authored by M. F. Melampy, M. P. Reina and K. R. Shields in 1998. Designed to assist the coatings engineer or specifier in identifying suitable protective coating systems for specific industrial environments.
Major manufacturers of protective coatings, steel fabricators, painting contractors, galvanizers, and end users, were surveyed to identify surface preparation and coating application costs, coating material costs, typical industrial environments and available generic coatings for use within those environments, and expected coating service lives (practical maintenance time).
Improved selection of testing protocols for corrosion coatings, along with proper interpretation of the results, allows for a better representation of how coatings will perform in service. A review of several types of corrosive service environments is presented, including the testing normally performed, along with a more in depth look at how to quantify performance variables in a rating system based on individual test results.
Stray current refers to electric current that flows elsewhere rather than along its intended path. Stray current is a well-known factor in pipeline maintenance and has been discovered to be an important consideration in communication and electric transmission structure maintenance. Corrosion caused by stray current is frequently many magnitudes greater than corrosion that occurs naturally in soil. Stray current may accelerate corrosion on guy anchors of communication towers and electric transmission towers which could lead to reduced service life or catastrophic failure.
In this paper, stray current corrosion risk for galvanized guy anchors is discussed in detail. Identification by structure-to-soil potential measurements is discussed. Stray current case studies are presented. Overall, this paper demonstrates that while stray current corrosion is a significant risk for guyed telecommunication and electric power structures, it can be detected and mitigated. This paper is an overview of the commonly accepted practices of stray current detection and mitigation used today.