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Carbon Steel Flanges - Pressure and Temperature Ratings

Maximum ratings for flanges conforming to ISO Standard 2229 dimensions and material specification AST-A-105.

Maximum pressure ratings for flanges conforming to ISO 2229 - Equipment for the petroleum and natural gas industries -- Steel pipe flanges, nominal sizes 1/2 to 24 in - Metric dimensions, and material specification ASTM A105 - Standard Specification for Carbon Steel Forgings for Piping Applications.

Carbon Steel Flanges - Pressure and Temperature Ratings
Temperature  (oC)
Gauge Pressure (kPa) 
Flanges Classes 150 - 2500
15030040060090015002500
< 38 1900 4960 6610 9920 14900 24830 41380
50 1830 4940 6560 9850 14840 24670 41130
100 1630 4800 6400 9600 14450 24020 40060
150 1450 4680 6260 9400 14130 23500 39200
200 1260 4600 6150 9190 13850 23060 38380
250 1070 4370 5850 8780 13170 21920 36600
300 940 3960 5300 7900 11900 19810 33060
350 810 3480 4670 6930 10490 17440 29000
375 750 3210 4340 6380 9660 15800 26770
400 690 2910 3940 5820 8780 14580 24360
425 640 2550 3440 5100 7730 12820 21250
450 580 2140 2880 4270 6460 10760 17820
475 510 1680 2240 3340 5070 8420 14030
500 400 1240 1620 2460 3720 6170 10330
525 340 810 1080 1600 2410 4030 6720
538 260 550 760 1100 1650 2820 4590
  • 1 Pa = 10-6 N/mm2 = 10-5 bar = 0.1020 kp/m2 = 1.02x10-4 m H2O = 9.869x10-6 atm = 1.45x10-4 psi (lbf/in2)

Carbon steel flanges - pressure rating vs. temperature

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