Abstract
This article considers the matter of controlling internal corrosion in a products pipe line system and reports experience with two control methods. A laboratory method of evaluating a particular oil soluble inhibitor is described, as well as the application of the laboratory method to control the degree of protection in the pipe line and to facilities beyond the pipe line. A specific method of determining the amount of inhibitor in the product also is discussed and proper interpretation of the laboratory data is emphasized.
Experience referred to covers the corrosion control in a single 8-inch products pipe line transporting only premium and regular grades of motor fuel and 100 and 115 grades of aviation gasoline. This includes use of a water soluble inhibitor for several years but because the degree of protection desired was not realized and because the protection ended at the pipe line terminus, decision was made to substitute an oil soluble inhibitor. Factors considered in selecting the oil soluble inhibitor included cost, effect on product specifications and the degree of protection desired both in the pipe line and to equipment beyond the pipe line.
Results indicate that benefits realized through the use of an oil soluble inhibitor more than offset its higher cost compared to the water soluble type. The article mentions briefly the attitude of the U. S. Air Force Materiel Command, which indicates the direction of general acceptance of the use of oil soluble inhibitors, at least in systems handling fuels for the U. S. Air Force.
