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Making up feed with water having low PH. Feed water getting contaminated with sea water, greese, fatty/fuel oils, CO2, 02 can cause water to become acidic leading to boiler corrosion as well as redusing it PH value. Lot of leakage will also cause more make up water and if regular blow down is not carried out, will cause increase in total disolve solides, thus reducing PH. Also if boiler water treatment is not carried out properly can result in drop in PH.
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