14 API RECOMMENDED PRACTICE 574

Table 1—Nominal Pipe Sizes, Schedules, Weight Classes, and Dimensions of Ferritic Steel Pipe

Pipe Size Approximate Approximate Nominal Nominal

Actual OD Actual OD Weight
Schedule ID ID Thickness Thickness
NPS DN in. mm Class
in. mm in. mm
1
/8 6 0.405 10.3 40 STD 0.269 6.84 0.068 1.73
80 XS 0.215 5.48 0.095 2.41
1
/4 8 0.540 13.7 40 STD 0.364 9.22 0.088 2.24
80 XS 0.302 7.66 0.119 3.02
3
/8 10 0.675 17.1 40 STD 0.493 12.48 0.091 2.31
80 XS 0.423 10.7 0.126 3.20
1
/2 15 0.840 21.3 40 STD 0.622 15.76 0.109 2.77
80 XS 0.546 13.84 0.147 3.73
160 0.464 11.74 0.188 4.78
— XXS 0.252 6.36 0.294 7.47
3
/4 20 1.050 26.7 40 STD 0.824 20.96 0.113 2.87
80 XS 0.742 18.88 0.154 3.91
160 0.612 15.58 0.219 5.56
— XXS 0.434 11.06 0.308 7.82
1 25 1.315 33.4 40 STD 1.049 26.64 0.133 3.38
80 XS 0.957 24.3 0.179 4.55
160 0.815 20.7 0.250 6.35
— XXS 0.599 15.22 0.358 9.09
1
1 /4 32 1.660 42.2 40 STD 1.380 35.08 0.140 3.56
80 XS 1.278 32.5 0.191 4.85
160 1.160 29.5 0.250 6.35
— XXS 0.896 22.8 0.382 9.70
1
1 /2 40 1.900 48.3 40 STD 1.610 40.94 0.145 3.68
80 XS 1.500 38.14 0.200 5.08
160 1.338 34.02 0.281 7.14
— XXS 1.100 28 0.400 10.15
2 50 2.375 60.3 40 STD 2.067 52.48 0.154 3.91
80 XS 1.939 49.22 0.218 5.54
160 1.687 42.82 0.344 8.74
— XXS 1.503 38.16 0.436 11.07
1
2 /2 65 2.875 73.0 40 STD 2.469 62.68 0.203 5.16
80 XS 2.323 58.98 0.276 7.01
160 2.125 53.94 0.375 9.53
— XXS 1.771 44.96 0.552 14.02
3 80 3.500 88.9 40 STD 3.068 77.92 0.216 5.49
80 XS 2.900 73.66 0.300 7.62
160 2.624 66.64 0.438 11.13
— XXS 2.300 58.42 0.600 15.24
1
3 /2 90 4.000 101.6 40 STD 3.548 90.12 0.226 5.74
80 XS 3.364 85.44 0.318 8.08
 INSPECTION PRACTICES FOR PIPING SYSTEM COMPONENTS 15

Table 1—Nominal Pipe Sizes, Schedules, Weight Classes, and Dimensions

of Ferritic Steel Pipe (Continued)

Pipe Size Approximate Approximate Nominal Nominal

Actual OD Actual OD Weight
Schedule ID ID Thickness Thickness
NPS DN in. mm Class
in. mm in. mm
4 100 4.500 114.3 40 STD 4.026 102.26 0.237 6.02
80 XS 3.826 97.18 0.337 8.56
120 3.624 92.04 0.438 11.13
160 3.438 87.32 0.531 13.49
— XXS 3.152 80.06 0.674 17.12
5 125 5.563 141.3 40 STD 5.047 128.2 0.258 6.55
80 XS 4.813 122.24 0.375 9.53
120 4.563 115.9 0.500 12.70
160 4.313 109.54 0.625 15.88
— XXS 4.063 103.2 0.750 19.05
6 150 6.625 168.3 40 STD 6.065 154.08 0.280 7.11
80 XS 5.761 146.36 0.432 10.97
120 5.501 139.76 0.562 14.27
160 5.187 131.78 0.719 18.26
— XXS 4.897 124.4 0.864 21.95
8 200 8.625 219.1 20 8.125 206.4 0.250 6.35
30 8.071 205.02 0.277 7.04
40 STD 7.981 202.74 0.322 8.18
60 7.813 198.48 0.406 10.31
80 XS 7.625 193.7 0.500 12.70
100 7.437 188.92 0.594 15.09
120 7.187 182.58 0.719 18.26
140 7.001 177.86 0.812 20.62
— XXS 6.875 174.64 0.875 22.23
160 6.813 173.08 0.906 23.01
10 250 10.75 273.0 20 10.250 260.3 0.250 6.35
30 10.136 257.4 0.307 7.80
40 STD 10.020 254.46 0.365 9.27
60 XS 9.750 247.6 0.500 12.70
80 9.562 242.82 0.594 15.09
100 9.312 236.48 0.719 18.26
120 9.062 230.12 0.844 21.44
140 8.750 222.2 1.000 25.40
160 8.500 215.84 1.125 28.58
16 API RECOMMENDED PRACTICE 574

Table 1—Nominal Pipe Sizes, Schedules, Weight Classes, and Dimensions

of Ferritic Steel Pipe (Continued)
Pipe Size Approximate Approximate Nominal Nominal
Actual OD Actual OD Weight
Schedule ID ID Thickness Thickness
NPS DN in. mm Class
in. mm in. mm
12 300 12.750 323.8 20 12.250 311.1 0.250 6.35
30 12.090 307.04 0.330 8.38
— STD 12.000 304.74 0.375 9.53
40 11.938 303.18 0.406 10.31
— XS 11.750 298.4 0.500 12.70
60 11.626 295.26 0.562 14.27
80 11.374 288.84 0.688 17.48
100 11.062 280.92 0.844 21.44
120 10.750 273 1.000 25.40
140 10.500 266.64 1.125 28.58
160 10.126 257.16 1.312 33.32
14 350 14.000 355.6 10 13.500 342.9 0.250 6.35
20 13.376 339.76 0.312 7.92
30 STD 13.250 336.54 0.375 9.53
40 13.124 333.34 0.438 11.13
— XS 13.000 330.2 0.500 12.70
60 12.812 325.42 0.594 15.09
80 12.500 317.5 0.750 19.05
100 12.124 307.94 0.938 23.83
120 11.812 300.02 1.094 27.79
140 11.500 292.088 1.125 31.756
160 11.188 284.18 1.406 35.71
16 400 16.000 406.4 10 15.500 393.7 0.250 6.35
20 15.376 390.56 0.312 7.92
30 STD 15.250 387.34 0.375 9.53
40 XS 15.000 381 0.500 12.70
60 14.688 373.08 0.656 16.66
80 14.312 363.52 0.844 21.44
100 13.938 354.02 1.0311 26.19
120 13.562 344.48 1.219 30.96
140 13.124 333.34 1.438 36.53
160 12.812 325.42 1.594 40.49
18 450 18.000 457 10 17.500 444.3 0.250 6.35
20 17.376 441.16 0.312 7.92
— STD 17.250 437.94 0.375 9.53
30 17.124 434.74 0.438 11.13
— XS 17.000 431.6 0.500 12.70
40 16.876 428.46 0.562 14.27
60 16.500 418.9 0.750 19.05
80 16.124 409.34 0.938 23.83
100 15.688 398.28 1.156 29.36
120 15.250 387.14 1.375 34.93
140 14.876 377.66 1.562 39.67
160 14.438 366.52 1.781 45.24
 INSPECTION PRACTICES FOR PIPING SYSTEM COMPONENTS 17

Table 1—Nominal Pipe Sizes, Schedules, Weight Classes, and Dimensions

of Ferritic Steel Pipe (Continued)

Pipe Size Approximate Approximate Nominal Nominal

Actual OD Actual OD Weight
Schedule ID ID Thickness Thickness
NPS DN in. mm Class
in. mm in. mm
20 500 20.000 508 10 19.500 495.3 0.250 6.35
20 STD 19.250 488.94 0.375 9.53
30 XS 19.000 482.6 0.500 12.70
40 18.812 477.82 0.594 15.09
60 18.376 466.76 0.812 20.62
80 17.938 455.62 1.031 26.19
100 17.438 442.92 1.281 32.54
120 17.000 431.8 1.500 38.10
140 16.500 419.1 1.750 44.45
160 16.062 407.98 1.969 50.01
22 550 22.000 559 10 21.500 546.3 0.250 6.35
20 STD 21.250 539.94 0.375 9.53
30 XS 21.000 533.6 0.500 12.70
60 20.250 514.54 0.875 22.23
80 19.750 501.84 1.125 28.58
100 19.250 489.14 1.375 34.93
120 18.750 476.44 1.625 41.28
140 18.250 463.74 1.875 47.63
160 17.750 451.04 2.125 53.98
24 600 24.000 610 10 23.500 597.3 0.250 6.35
20 STD 23.250 590.94 0.375 9.53
— XS 23.000 584.6 0.500 12.70
30 22.876 581.46 0.562 14.27
40 22.624 575.04 0.688 17.48
60 22.062 560.78 0.969 24.61
80 21.562 548.08 1.219 30.96
100 20.938 532.22 1.531 38.89
120 20.376 517.96 1.812 46.02
140 19.876 505.26 2.062 52.37
160 19.312 490.92 2.344 59.54