Trisodium Phosphate dosing is done in boiler drum which react with scale forming salts like calcium cloride,calcium sulphate.
3 cacl2 + 2 na3 po4 = ca3 (po4)2 +6 nacl
the sludge collected in bottom header which can be removed by operating low points drain.
phosphate dosing is done to prevent scale formation in boiler tubes and to maintain ph value to prevent corrosion as well to avoid silica carry over by steam.
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