This is the second progress report from an inrestigalion being performed under the sponsorship of thw American ,ociely of Mechanical Engineers with joiz financial support by the Edison Electric Institute, Indus!ry, and others concerned with the operation of high pressure boilers. Ii ~ CLEARINGHOUS Ii FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMiATION4 ar~Coop o C k x o ABSTRACT Ihe following report is the second in a series of three --describing the progress of "A Research Study on Inter-..nal

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... rrosion of High Pressure Boilers." The first elm V AWMit1TY Ciprogress report, presented by Messrs. H. A. Klein and J. K. Rice at the 1965 annual meeting of the ASME, K T V-/ describes the backgrounid, scope, and organization of the program as well as the test facility. This second progress report describes the results of the first half of the study. Results of tests with volatile, coordinated phosphate, and caustic boiler water treatment under conditions simulating a boiler with clean internal surfaces and one whose surfaces have been fouled with typical preboiler corrosion products, are included. Data relating to deposition and corrosion in the above environments are presc ited. The corrosion failure of a test tube due to "caustic gouging" and the discovery of an unusual effect of deposits on boiling characteristics are describd.