Carbon steel flanges-Pressure and temperature ratings
Maximum ratings for flanges conforming to ISO Standard 2229 dimensions and material specification ASTM-A105
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.
| Gauge Pressure (kPa) | |||||||
| Temperature (oC) | Flanges Classes 150 – 2500 | ||||||
| 150 | 300 | 400 | 600 | 900 | 1500 | 2500 | |
| < 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 = 1.02×10-4 m H2O = 9.869×10-6 atm = 1.45×10-4 psi (lbf/in2)
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