API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

2.B-88 API RECOMMENDED PRACTICE 581
Table 2.B.11.3—pH Calculation Parameters
C 1 Factor C 3 Factor C 4 Factor
Total Solids
(mg/L)
C 1
Calcium
Hardness
(mg/L CaCO 3 )
C 3
M.O. Alkalinity
(mg/L CaCO 3 )
C 4
50 to 400 0.1 10.5 0.6 10.5 1.0
>400 to 1000 0.2 12.5 0.7 12.5 1.1
C 2 Factor
15.5 0.8 15.5 1.2
20 0.9 20 1.3
Temperature
(ºC)
Temperature
(ºF)
C 2
25 1.0 25 1.4
31 1.1 31 1.5
1 33 2.6 39 1.2 40 1.6
4 39 2.5 49.5 1.3 50 1.7
8 46 2.4 62.5 1.4 62.5 1.8
12 53 2.3 78.5 1.5 79 1.9
16 60 2.2 99 1.6 99.5 2.0
19 67 2.1 124.5 1.7 125 2.1
24 76 2.0 156.5 1.8 158 2.2
29 85 1.9 197.5 1.9 197.5 2.3
34 94 1.8 250 2.0 250 2.4
41 105 1.7 310 2.1 315 2.5
47 117 1.6 390 2.2 400 2.6
53 128 1.5 495 2.3 500 2.7
60 140 1.4 625 2.4 625 2.8
68 154 1.3 785 2.5 790 2.9
77 170 1.2 940 2.6 945 3.0