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Table 7-4.Trisodium Phosphate Dosage For Natural Circulation Auxiliary Boilers (Trisodium Pbosphate, Dodecahydrate, Na3 PO4 12H20)

 
  
 
ENGINEMAN  1  &  C freshly filled, chemically treated boiler, prior to light off, is not representative and is therefore meaningless. The freshly filled and treated boiler shall   be   steamed   immediately   but   not   later than 24 hours after being filled. Preferably, the boiler should not be filled unless it is expected to  be  fired  within  24  hours.  If  the  boiler  can- not  be  steamed  within  24  hours,  it  should  be placed under dry layup in accordance with chap- ter   221,   Boilers,  Naval   Ships’   Technical Manual. ALKALINITY AND PHOSPHATE.—Since the  addition  of  TSP  to  raise  the  alkalinity also raises the phosphate, the control of alkalinity and  phosphate  are  linked.  The  DSP  provides additional   phosphate   as   needed.   The   boiler water  volume  for  chemical  treatment  must  be determined  as  described  earlier.  Using  this volume,   the   dosages   of   TSP   and   DSP   are calculated. Table 7-4 gives the TSP dosage fac- tor (ounces per gallon) for all values of alkalinity. The boiler volume is multiplied by the factor and the dosage of TSP is entered to the nearest one- half ounce in the appropriate space. The increase in  phosphate  due  to  TSP  is  given  in  the  last column. The DSP dosages are calculated similarly using the DSP factors (ounces per gallon) given in table 7-5. TSP and DSP dosages for the aux- iliary boilers are given in tables 7-6 and 7-7. The procedures for determining the chemical treatment Table 7-4.—Trisodium Phosphate Dosage For Natural Circulation Auxiliary Boilers (Trisodium Pbosphate, Dodecahydrate, Na3PO412H20) Boiler water Alkalinity epm (meg/L) 0.1 0.095 X = 0.2 0.090 X = 0.3 0.085 X = 0.4 0.080 X = 0.5 0.075 X = 0.6 0.070 X = 0.7 0.065 X = 0.8 0.060 X = 0.9 0.055 X = 1.0 0.050 X = 1.1 0.045 X = 1.2 0.040 X = 1.3 0.035 X = 1.4 0.030 X = 1.5 0.025 X = 1.6 0.020 X = 1.7 0.015 X = 1.8 0.010 X = 1.9 0.005 X TSP Dosage Factor (ounces/gallon) X (Enter) Boiler Water Volume for Chemical Treatment (gallons) = (Calculate) Ounces of TSP required to raise alkalinity to 2.0 epm Phosphate Correction 180 170 160 150 140 130 120 110 100 90 90 80 70 60 50 40 30 20 10 = 1 gallon = 3.785 liters 1 ounce = 28.35 grams TSP - Trisodium Phosphate 7-12


   


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