β Scribed by George S. Strong
No coin nor oath required. For personal study only.
In order to properly understand the requirements of an effective feed-water purifier it will be necessary to understand something of the character of the impurities of natural waters used for feeding boilers, and of the manner in which the)" become troublesome in causing incrustation or scale, as it is commonly called, in steam boilers. All natural waters are known to contain more or less mineral matter, partly held in solution and partly in mechanical suspension. These mineral impurities are derived by contact of the water with the earth's surface, and by percolation through its soil and rocks. Tile substances taken up in solution by this process consist chiefly of the carbonates and sulphates of lime and magnesia, and the chloride of sodium. The materials carried in mechanical suspension are clay, sand and vegetable matter. There are many other saline ingredients ill various natural waters, but they exist in such minute quantities, and are generally, so very soluble, that their presence may safely be ignored in treating of the utility of boiler waters.
Of the above named salts the carbonates of lime and magnesia are soluble only when the water contains free carbonic acid.
π SIMILAR VOLUMES