CORROSION RESISTANT FLANGES
PRESSURE-TEMPERATURE RATINGS

This flange rating data is reprinted by permission of the American National Standards Institute from ASME B16.5. See that Standard for complete listings.Attention is directed to the following considerations when using these ratings.

  1. The ratings apply to:
    1. Ring joint facing.
    2. Small tongue and groove facing with any type gasket.
    3. Large tongue and groove facing with any type gasket, except flat solid metal.
    4. Any other facing and gasket combination that results in a bolt load or flangemoment no greater than for a), b), or c) above.
  2. Temperatures used in establishing these ratings are the temperatures inside the pressure retaining structure.
  3. Use of these ratings requires gaskets conforming to the limiting dimensions set forth in MSS SP-47. Care should be taken to select gaskets of dimensions and materials suitable for service conditions and able to withstand required bolt loading without injurious crushing.
  4. Ratings shown are the maximum, non-shock pressures (psig) at the tabulated temperature and may be interpolated between the temperatures shown.
 Notes :

  1. Materials shall not be used beyond the limits specified in the governing Code.
  2. Class 150 lb. flanges are not rated above 1000°F.
  3. Plate materials are listed only for use as blind flanges (see ANSI B16.5, par. 5.1). Additional plate materials listed in ANSI B16.34 may also be used, with corresponding B16.34 Standard class ratings.
  4. At temperatures over 1000°F (540°C), use only when the carbon content is 0.04 percent or higher.
  5. For temperatures above 1000°F (540°C), use only if the material is heat treated by heating it to a temperature of at least 1900°F (1040°C) and quenching in water or rapidly cooling by other means.
  6. For service temperature above 850°F (455°C), it is recommended that killed steels containing not less than 0.10 percent residual silicon be used.
  7. For service temperatures of 1050°F (566°C) and above, assurance must be provided that grain size is not finer than ASTM No. 6.
  8. Not to be used over 800°F.
  9. Not to be used over 850°F.
Material Group No Nominal Designation
Steel		 Forgings Plates
Spec.–Gr Notes Spec.–Gr Notes
2.1 18Cr-8Ni A182-F304 (4) A240-304 (4) (5)
A182-F304H
18CR-8Ni
2.2 16CR-12Ni-2Mo A182-F316 (4) A240-316 (4) (5)
A182-F316H
18Cr-13Ni-3Mo A240-317 (4) (5)
18Cr-9Ni-2Mo
2.3 18Cr-8Ni A182-F304L (8) A240-304L (8)
16Cr-12Ni-2Mo A182-F316L (9) A240-316L (9)
2.4 18Cr-10Ni-Ti A182-F321 (4) A240-321 (4) (5)
A182-F321H A240-321H (5)
2.5 18Cr-10Ni-Cb A182-F347 (4) A240-321 (4) (5)
A182-F347H A240-321H (5)
A182-F348 (4) A240-348 (4)
(5)
A182-F348H A240-348H (5)
2.6 25Cr-12Ni
23Cr-12Ni A240-309S (4) (5)
2.7 25Cr-20Ni A182-F310 (4) (7) A240-310S (4) (7)
Class 150 (2)Mat’l Group Materials Temp, °F 2.1

Type 304

 2.2

Type 316

 2.3

Type 304L

Type 316L

 2.4

Type 321

 2.5

Type 347,348

 2.6

Type 309

 2.7

Type 310
-20 to 100 275 275 230 275 275 260
200 235 240 195 235 245 230
300 205 215 175 210 225 220
400 180 195 160 190 200
500 170 145 170
600 140 140 140
650 125 125 125
700 110 110 110
750 95 95 95
800 80 80 80
850 65 65 65
900 50 50
950 35 35
1000 20 20

PRESSURE / TEMPERATURE RATINGS

 

Mat’l Group Class 300 Class 400 Class 600
Material
Temp °F		 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.1 2.2 2.3 2.4 2.5 2.6 2.7
Type

304

 Type

316

 Type

304L

Type

316L

 Type

321

 Type

347

348

 Type

309

 Type

310

 Type

304

 Type

316

 Type

304L

Type

316L

 Type

321

 Type

347

348

 Type

309

 Type

310

 Type

304

 Type

316

 Type

304L

Type

316L

 Type

321

 Type

347

348

 Type

309

 Type

310
100 720 720 600 720 720 670 960 960 800 960 960 895 1440 1440 1200 1440 1440 1345
200 600 620 505 610 635 605 800 825 675 815 850 805 1200 1240 1015 1220 1270 1210
300 530 560 455 545 590 570 705 745 605 725 785 760 1055 1120 910 1090 1175 1140
400 470 515 415 495 555 535 630 685 550 660 740 710 940 1030 825 990 1110 1065
500 435 480 380 460 520 505 585 635 510 610 690 670 875 955 765 915 1035 1010
600 415 450 360 435 490 480 555 600 480 585 655 635 830 905 720 875 985 955
650 410 445 350 430 480 465 545 590 470 570 640 620 815 890 700 855 960 930
700 405 430 345 420 470 455 540 575 460 560 625 610 805 865 685 840 935 910
750 400 425 335 415 460 445 530 565 450 555 615 595 795 845 670 830 920 895
800 395 415 330 415 455 435 525 555 440 550 610 580 790 830 660 825 910 870
850 390 405 320 410 445 425 520 540 430 545 590 565 780 810 645 815 890 850
900 385 395 405 430 415 510 525 540 575 555 770 790 810 865 830
950 375 385 385 385 385 500 515 515 515 515 750 775 775 775 775
1000 325 365 355 365 335 350 430 485 475 485 450 465 645 725 715 725 670 700
1050 310 360 345 360 290 335 410 480 460 480 390 445 620 720 695 720 585 665
1100 260 325 300 325 225 290 345 430 400 430 300 390 515 645 605 645 445 585
1150 195 275 235 275 170 245 260 365 315 365 230 330 390 550 475 550 345 495
1200 155 205 180 170 130 205 205 275 240 230 175 275 310 410 365 345 260 410
1250 110 180 140 125 100 160 145 245 185 165 135 215 220 365 280 245 200 325
1300 85 140 105 95 80 120 110 185 140 125 105 160 165 275 210 185 160 240
1350 60 105 80 70 60 80 85 140 110 90 80 105 125 205 165 135 115 160
1400 50 75 60 50 45 55 65 100 80 70 60 75 90 150 125 105 90 110
1450 35 60 50 40 30 40 45 80 65 55 40 50 70 115 95 80 60 75
1500 25 40 40 35 25 25 30 55 50 45 30 30 50 85 75 70 50 50

PRESSURE / TEMPERATURE RATINGS

 

Mat’l Group Class 900 Class 1500 Class 2500
Material

Temp °F

 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.1 2.2 2.3 2.4 2.5 2.6 2.7
Type

304

 Type

316

 Type

304L

Type

316L

 Type

321

 Type

347

348

 Type

309

 Type

310

 Type

304

 Type

316

 Type

304L

Type

316L

 Type

321

 Type

347

348

 Type

309

 Type

310

 Type

304

 Type

316

 Type

304L

Type

316L

 Type

321

 Type

347

348

 Type

309

 Type

310
100 2160 2160 1800 2160 2160 2015 3600 3600 3000 3600 3600 3360 6000 6000 5000 6000 6000 5600
200 1800 1860 1520 1830 1910 1815 3000 3095 2530 3050 3180 3025 5000 5160 4220 5080 5300 5040
300 1585 1680 1360 1635 1765 1705 2640 2795 2270 2725 2940 2845 4400 4660 3780 4540 4900 4740
400 1410 1540 1240 1485 1665 1600 2350 2570 2065 2470 2770 2665 3920 4280 3440 4120 4620 4440
500 1310 1435 1145 1375 1555 1510 2185 2390 1910 2290 2590 2520 3640 3980 3180 3820 4320 4200
600 1245 1355 1080 1310 1475 1435 2075 2255 1800 2185 2460 2390 3460 3760 3000 3640 4100 3980
650 1225 1330 1050 1280 1440 1395 2040 2220 1750 2135 2400 2330 3400 3700 2920 3560 4000 3880
700 1210 1295 1030 1260 1405 1370 2015 2160 1715 2100 2340 2280 3360 3600 2860 3500 3900 3800
750 1195 1270 1010 1245 1385 1340 1990 2110 1680 2075 2305 2230 3320 3520 2800 3460 3840 3720
800 1180 1245 985 1240 1370 1305 1970 2075 1645 2065 2280 2170 3280 3460 2740 3440 3800 3620
850 1165 1215 965 1225 1330 1275 1945 2030 1610 2040 2220 2125 3240 3380 2680 3400 3700 3540
900 1150 1180 1215 1295 1245 1920 1970 2030 2160 2075 3200 3280 3380 3600 3460
950 1125 1160 1160 1160 1160 1870 1930 1930 1930 1930 3120 3220 3220 3220 3220
1000 965 1090 1070 1090 1010 1050 1610 1820 1785 1820 1680 1750 2685 3030 2970 3030 2800 2915
1050 925 1080 1040 1080 875 1000 1545 1800 1730 1800 1460 1665 2570 3000 2885 3000 2430 2770
1100 770 965 905 965 670 875 1285 1610 1510 1610 1115 1460 2145 2685 2515 2685 1860 2430
1150 585 825 710 825 515 740 980 1370 1185 1370 860 1235 1630 2285 1970 2285 1430 2060
1200 465 620 545 515 390 620 770 1030 910 855 650 1030 1285 1715 1515 1430 1085 1715
1250 330 545 420 370 300 485 550 910 705 615 495 805 915 1515 1170 1030 830 1345
1300 245 410 320 280 235 360 410 685 530 465 395 600 685 1145 885 770 660 1000
1350 185 310 245 205 175 235 310 515 410 345 290 395 515 860 685 570 485 660
1400 145 225 185 155 135 165 240 380 310 255 225 275 400 630 515 430 370 460
1450 105 175 145 125 95 115 170 290 240 205 155 190 285 485 400 345 260 315
1500 70 125 115 105 70 70 120 205 190 170 120 120 200 345 315 285 200 200