The alkalinity of boiler water should be sufficiently high enough to protect shell and plates against acidic corrosion but not high enough to produce carryover. A minimum value for alkalinity for adequate protection is 200 PPM. High boiler alkalinity which is in excess of 700 PPM should be avoided. Values higher than this can lead to embrittlement of the steel. Phosphates. Phosphates are used to react with
May 03 2018 · When the solubility of a specific component in water is exceeded scale or deposits develop. The boiler water must be sufficiently free of deposit forming solids to allow rapid and efficient heat transfer and it must not be corrosive to the boiler metal.