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

2-142 API RECOMMENDED PRACTICE 581
Table 20.5—DF, Component Subject to PWHT—Brittle Fracture
CET − T ref
(°F)
DF As a Function of Component Thickness (in.)
0.25 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
100 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
80 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2
60 0.0 0.0 0.0 0.0 0.0 0.5 0.9 1.1 1.3
40 0.0 0.0 0.0 0.5 1.1 1.3 2 3 4
20 0.0 0.0 0.6 1.2 2 4 7 13 23
0 0.0 0.0 1.1 2 6 14 29 53 88
−20 0.0 0.4 2 5 17 41 83 144 224
−40 0.0 0.9 3 12 38 90 171 281 416
−60 0.0 1.1 5 22 68 153 277 436 623
−80 0.0 1.2 7 34 102 219 382 582 810
−100 0.0 1.3 9 46 133 277 472 704 962
Table 20.5M—DF, Component Subject to PWHT—Brittle Fracture
CET − T ref
(°C)
DF As a Function of Component Thickness (mm)
6.4 12.7 25.4 38.1 50.8 63.5 76.2 88.9 101.6
56 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
44 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2
33 0.0 0.0 0.0 0.0 0.0 0.5 0.9 1.1 1.3
22 0.0 0.0 0.0 0.5 1.1 1.3 2 3 4
11 0.0 0.0 0.6 1.2 2 4 7 13 23
−0 0.0 0.0 1.1 2 6 14 29 53 88
−11 0.0 0.4 2 5 17 41 83 144 224
−22 0.0 0.9 3 12 38 90 171 281 416
−33 0.0 1.1 5 22 68 153 277 436 623
−44 0.0 1.2 7 34 102 219 382 582 810
−56 0.0 1.3 9 46 133 277 472 704 962