Abstract
The painting of galvanized electrical structures, that is, transmission towers and substation structures, involves the application of a protective coating over weathered and/or previously painted galvanized steel. This paper provides some discussion of the theory of galvanizing and the corrosion process. Furthermore, information will be presented about why and when it is necessary to paint galvanized structures.
The history of painting galvanized structures over the past 50 years, and the evolution and usage of different paint systems, play an important role in the selection of present day coating systems. Cost comparisons between different generic paint types are made in order to illustrate the effect upon the overall cost per year to paint galvanized structures. Pertinent information is provided so that electric utilities can write a specification which includes the proper surface preparation, material selection, application guidelines, and safety and environmental requirements.
In the past electric utilities have implemented their own tower painting program. Recently some utilities are requesting that the coating manufacturer act as General Contractor in accomplishing the required work. This single source responsibility approach, while not being the least costly, is a cost effective way for the power company to accomplish guaranteed work with minimal participation by utility personnel.
