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The purpose of this session is to present an omnibus report on recent developments in the field of boiler-water chemical engineering. A panel of experts is ready to summarize for you the newer literature and, in some instances, unpublished information on chemical cleaning of boilers; on preparation of the boiler feedwater; on treatment to prevent corrosion, encrustation, and carry-over; and on chemical treatment to prevent corrosion by condensed steam.The evolution of the modern steam generator has been made possible by a partnership of advances in mechanical engineering design, progress in physical metallurgy, and new chemical engineering skills in water conditioning. It is an indication of this evolution that embrittlement cracking of boiler seams, relatively recently an important topic of panel discussions, can now be covered briefly as a minor aspect of boiler corrosion that we have learned to control.The emphasis now is on economy of fuel through clean boilers and clean turbines; the preservation of the expensive boiler and its auxiliaries from corrosion, fouling, and over-heating; and the dependable availability of the steam-generating and steam-utilizing plant.Each of the experts will summarize "what's new" in his assigned topic.