Chapter 7AUXILIARY MACHINERY
Table 7-7.Calculated Disodium Phosphate Dosages For Some Natural Circulation Auxiliary Boilers, (Disodium Phosphate
Anhydrous, Na2HPO4)
Corrected
Boiler Water
Phosphate
ppm (mg/L)
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
240
270
280
290
Boiler Water Volume at Normal Steaming Level
(Gallons)
84
215
280
300
Ounces of DSP
Required to Raise Phosphate to 300 ppm (300 mg/L)
5
12.5
16
17.5
4.5
12
15.5
17
4.5
11.5
15
16
4.5
11
14.5
15.5
4
10.5
14
15
4
10
13.5
14.5
4
10
13
14
3.5
9.5
12.5
13
3.5
9
12
12.5
3.5
8.5
11
12
3
8
10.5
11.5
3
7.5
10
11
3
7
9.5
10
2.5
7
9
9.5
2.5
6.5
8.5
9
2.5
6
8
8.5
2
5.5
7.5
8
2
5
7
7
2
4.5
6
6.5
1.5
4.5
5.5
6
1.5
4
5
5.5
1.5
3.5
4.5
5
1
3
4
4
1
2.5
3.5
3.5
1
2
3
3
0.5
1.5
2
2.5
0.5
1
1.5
2
0.5
1
1
1
0.5
0.5
0.5
0.5
1 gallon - 3.785 liters
1 ounce - 28.35 grams
DSP - Disodium Phosphate
7-15