ENGINEMAN 1 & CTable 7-6.—Calculated Trisodium Phosphate Dosages For Some Natural Circulation Auxiliary Boilers (Trisodium Phosphate,Dodecahydrate Na3Po412H2O)Boiler WaterAlkalinityepm (meg/L)84215280300Required to Raise Alkalinity to 2.0 epm (2.0 meq/L)0.180.27.50.370.46.50.56.50.660.75.50.850.94.51.041.141.23.51.331.42.51.521.61.51.71.51.811.90.5Boiler Water Volume at Normal Steaming Level(Gallons)Ounces of TSP1 ounce = 28.35 grams1 gallon = 3.785 litersTSP - Trisodium Phosphate20.519.518.517161514131210.59.58.57.526.528.518025211702425.516022.5241502122.514019.5211301819.5120171811015.516.510014159012.513.5901112801010.5708.596077.5505.564044.53033201.51.510AddtoCurrentPhosphate6.55.54.53213. Continue to the last column to find thephosphate correction. This is the amount thephosphate will increase due to the TSP. Recordthe phosphate correction in the log.4. Add the phosphate correction caused byTSP to the measured boiler water phosphate. Thisgives the corrected phosphate concentration;record this in the log.5. Proceed to table 7-5. Locate the correctedphosphate in the first column. Read across thetable to the weight of DSP required for thecorrect volume. (Use table 7-7 for the vessels listedearlier.) Enter this weight in the log.6. Weigh the chemicals, dissolve themtogether in the 10-liter safety dispensing bottle,and inject the solution into the boiler.NOTE: TSP must be dissolved in cold feed-water since TSP generates heat when dissolving.DSP must be dissolved in hot feedwater if onlyDSP will be injected into the boiler. Therefore,TSP should be added first to cold water in thebottle, then dissolved. This will generate sufficient7-14
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business