ASME Flanges_pressure Classes

Table 2-1.1 Pressure–Temperature Ratings for Group 1.1 Materials Nominal Designation

Forgings

C–Si

A 105 (1)

C–Mn–Si C–Mn–Si–V 31⁄2Ni

A 350 Gr. LF2 (1) A 350 Gr. LF6 Cl 1 (3) A 350 Gr. LF3

Castings A 216 Gr. WCB (1) ... ... ...

Plates A 515 Gr. 70 (1) A 516 Gr. 70 (1), (2) A 537 Cl. 1 (4) ...

Working Pressure by Classes, bar Class Temp., °C

150

300

400

600

900

1500

2500

−29 to 38 50 100 150 200

19.6 19.2 17.7 15.8 13.8

51.1 50.1 46.6 45.1 43.8

68.1 66.8 62.1 60.1 58.4

102.1 100.2 93.2 90.2 87.6

153.2 150.4 139.8 135.2 131.4

255.3 250.6 233.0 225.4 219.0

425.5 417.7 388.3 375.6 365.0

250 300 325 350 375

12.1 10.2 9.3 8.4 7.4

41.9 39.8 38.7 37.6 36.4

55.9 53.1 51.6 50.1 48.5

83.9 79.6 77.4 75.1 72.7

125.8 119.5 116.1 112.7 109.1

209.7 199.1 193.6 187.8 181.8

349.5 331.8 322.6 313.0 303.1

400 425 450 475 500 538

6.5 5.5 4.6 3.7 2.8 1.4

34.7 28.8 23.0 17.4 11.8 5.9

46.3 38.4 30.7 23.2 15.7 7.9

69.4 57.5 46.0 34.9 23.5 11.8

104.2 86.3 69.0 52.3 35.3 17.7

173.6 143.8 115.0 87.2 58.8 29.5

289.3 239.7 191.7 145.3 97.9 49.2

NOTES: (1) Upon prolonged exposure to temperatures above 425°C, the carbide phase of steel may be converted to graphite. Permissible but not recommended for prolonged use above 425°C. (2) Not to be used over 455°C. (3) Not to be used over 260°C. (4) Not to be used over 370°C.

Table II-2-1.1 Pressure–Temperature Ratings for Group 1.1 Materials Nominal Designation

Forgings

Castings

Plates

C–Si

A 105 (1)

C–Mn–Si

A 350 Gr. LF2 (1)

...

C–Mn–Si–V

A 350 Gr. LF6 Cl. 1 (3)

...

...

A 350 Gr. LF 3

...

...

1

3 ⁄2Ni

A 216 Gr. WCB (1)

A 515 Gr. 70 (1) A 516 Gr. 70 (1), (2) A 537 Cl. 1 (4)

Working Pressures by Classes, psig Class Temp., °F

150

300

400

600

900

1500

2500

−20 to 100 200 300 400 500

285 260 230 200 170

740 680 655 635 605

985 905 870 845 805

1,480 1,360 1,310 1,265 1,205

2,220 2,035 1,965 1,900 1,810

3,705 3,395 3,270 3,170 3,015

6,170 5,655 5,450 5,280 5,025

600 650 700 750 800

140 125 110 95 80

570 550 530 505 410

755 730 710 675 550

1,135 1,100 1,060 1,015 825

1,705 1,650 1,590 1,520 1,235

2,840 2,745 2,655 2,535 2,055

4,730 4,575 4,425 4,230 3,430

850 900 950 1,000

65 50 35 20

320 230 135 85

425 305 185 115

640 460 275 170

955 690 410 255

1,595 1,150 685 430

2,655 1,915 1,145 715

NOTES: (1) Upon prolonged exposure to temperatures above 800°F, the carbide phase of steel may be converted to graphite. Permissible but not recommended for prolonged use above 800°F. (2) Not to be used over 850°F. (3) Not to be used over 500°F. (4) Not to be used over 700°F.