Chapter 7—AUXILIARY MACHINERYTable 7-5.—Disodium Phosphate Dosage For Natural Circulation Auxiliary Boilers (Disodium Phoshate, AnhydrousNa2HPO4)CorrectedDSP Dosage=Boiler WaterFactorPhoshate(ounces/gallons)ppm (mg/L)102030405060708090100110120130140150160170180190200210220230240250260270280X0.058X0.056X0.054X0.052X0.050X0.048X0.046X0.044X0.042X0.040X0.038X0.036X0.034X0.032X0.030X0.028X0.026X0.024X0.022X0.020X0.018X0.016X0.014X0.012X0.010X0.008X0.006X0.004X2900.002X(Enter)Boiler WaterVolume forChemicalTreatment(gallons)(Calculate)ounces ofDSP Requiredto raise Phosphateto 300 ppm (300 mg/L)=============================1 ounce - 28.35 grams1 gallon - 3.785 litersDSP - Disodium Phosphatedosages for the completed dosage tables aredescribed below:1. Determine the alkalinity and phosphateconcentrations in the boiler water from sampleresults.2. Locate the boiler water alkalinity in thefirst column of table 7-4. Then read acrossto the weight of TSP required for the correctvolume. (Use table 7-6 for the vessels listed ear-lier in the chapter.) Enter this weight in thelog.7-13
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