Although coatings have been used on buried pipelines for more than 30 years, the use of what might be termed “modern pipeline coatings” did not begin until the middle of the 1940’s. The beginning of the era of “modern pipeline coatings” probably falls between the publication dates of the National Bureau of Standards Circulars 450 (1945),1  and 579 (1957),2  which were both entitled “Underground Corrosion.” These two circulars report on a considerable amount of coating testing, sponsored by the Bureau, The American Gas Association and the American Petroleum Institute. The knowledge gained from these tests led to the development of enamel coating systems as they are known today.

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