| Abstrakt: |
The importance of taking into consideration the corrosive properties of a boiler feedwater as well as its tendency to form scale is coming to be more and more generally recognized, and the interpretation of the various types of analyses employed for the purpose forms the substance of the present paper. Feedwater impurities fall into at least one of three groupings: dissolved solids, pollution products, and dissolved gases. The dissolved solids determinable under a technical analysis naturally group themselves into corrosive and scale-forming constituents according as they are or are not highly ionized in aqueous solutions. Pollution products are detected by inferential methods in a partial sanitary analysis, but the effects of various types of pollution other than manufacturing wastes as indicated by the analysis are concretely set forth. Dissolved-gas analyses, meaning in the main dissolved-oxygen analyses, are discussed in relation to the safe operating limits of hot-water feed lines, boilers, and cast-iron and steel-tube economizers. An appendix translates the facts of the paper into a working plan for use in the chemical laboratory. |
