The alkalinity of the boiler water keeps dropping – how to deal with it?
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The water hardness and pH of the steam boilers in my company are within acceptable limits. However, whenever the boilers are drained, the alkalinity and phenolphthalein alkalinity exceed the specified limits; the pH even reaches 13. The water samples taken out appear yellowish – could this be due to corrosion inside the boilers? Is the yellowing caused by ferrous ions? Is there any way to address this issue?
Excess alkalinity is caused by insufficient wastewater discharge, and there is no direct relationship between alkalinity and pH.
Our alkalinity just won’t go up – you guys are lucky! If the alkalinity is high, increase the interval between discharges and reinforce regular discharge – this will definitely help reduce the issue. Is the condensate water being reused?