Steel pipes schedule is marked by ‘Sch’ and is an indicating method represented by ASME/ANSI B36.10. The inside diameter of any steel pipe is crucial, as most are used to transport fluids and gases. Schedule 80 does not refer to the wall thickness of the pipe, but rather a range of wall thicknesses. Different specifications represent varying wall thicknesses for the same diameter. SCH 80 pipe is used in a wide variety of industries and is in high demand. SCH 80 pipe is stronger and heavier than SCH 40 pipe and is primarily used in applications where the pipe must be exposed.
Hunan Standard Steel Co., Ltd. is a major producer of schedule 80 steel pipes dimensions in mm and has been supplying its products to a wide range of customers across various industries.
Source of SCH 80 Pipe Pressure Rating:
The pressure rating of SCH 80 seamless steel pipe is mainly based on the following international standards and engineering specifications. Its technical parameters and design criteria have strict scientific basis and industry consensus:
(1) ASME B36.10 (carbon steel/alloy steel) & B36.19 (stainless steel)
Wall thickness definition: clearly defines the wall thickness size series of SCH 80 to ensure the pressure consistency of different pipe diameters.
Outer diameter standard: specifies the fixed outer diameter corresponding to each NPS (inch system) (for example, the outer diameter of a 2" pipe is always 60.3mm).
(2) ASME B31 series pressure piping specifications
B31.1 (power piping): high temperature and high pressure design criteria for power and boiler systems.
B31.3 (process piping): calculation method for pressure-temperature rating (P-T Rating) in the chemical and petroleum industries.
(3) ASTM material standards
A106 (carbon steel), A312 (stainless steel) and other specified materials have mechanical properties (such as tensile strength and yield strength) that directly affect the allowable stress value.
Schedule (SCH) 80 Pipes Pressure Rating:
| Maximum Allowable Pressure (psi) (kPa) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NPS | Outside Diameter | Schedule | ||||||||||||
| (inch) | (inch) (mm) | 10 | 20 | 30 | STD | 40 | 60 | XS | 80 | 100 | 120 | 140 | 160 | XXS |
| 1/4 Inch | 0.54 Inch 13.7 | 7985 55057 | 7985 55057 | 10798 74452 | 10798 74452 | |||||||||
| 3/8 Inch | 0.675 Inch 17.1 | 6606 45548 | 6606 45548 | 9147 63069 | 9147 63069 | |||||||||
| 1/2 Inch | 0.84 Inch 21.3 | 6358 43838 | 6358 43838 | 8575 59125 | 8575 59125 | 10908 75211 | 17150 118249 | |||||||
| 3/4 Inch | 1.05 Inch 26.7 | 5273 36357 | 5273 36357 | 7187 49554 | 7187 49554 | 10220 70467 | 14373 99102 | |||||||
| 1 Inch | 1.315 Inch 33.4 | 4956 34172 | 4956 34172 | 6670 45990 | 6670 45990 | 9316 64234 | 13340 91979 | |||||||
| 1 1/4 Inch | 1.66 Inch 42.2 | 4133 28497 | 4133 28497 | 5638 38874 | 5638 38874 | 7380 50885 | 11276 77748 | |||||||
| 1 1/2 Inch | 1.9 Inch 48.3 | 3739 25780 | 3739 25780 | 5158 35564 | 5158 35564 | 7247 49968 | 10316 71129 | |||||||
| 2 Inch | 2.375 Inch 60.3 | 3177 21905 | 3177 21905 | 4498 31014 | 4498 31014 | 7097 48934 | 8995 62021 | |||||||
| 2 1/2 Inch | 2.875 Inch 73 | 3460 23857 | 3460 23857 | 4704 32434 | 4704 32434 | 6391 44066 | 9408 64868 | |||||||
| 3 Inch | 3.5 Inch 88.9 | 3024 20850 | 3024 20850 | 4200 28959 | 4200 28959 | 6132 42280 | 8400 57918 | |||||||
| 3 1/2 Inch | 4 Inch 102 | 2769 19092 | 2769 19092 | 3896 26863 | 3896 26863 | |||||||||
| 4 Inch | 4.5 Inch 114 | 2581 17796 | 2581 17796 | 3670 25305 | 3670 25305 | 4769 32882 | 5782 39867 | 7339 50602 | ||||||
| 5 Inch | 5.563 Inch 141 | 2273 15672 | 2273 15672 | 3303 22774 | 3303 22774 | 4404 30366 | 5505 37957 | 6606 45548 | ||||||
| 6 Inch | 6.625 Inch 168 | 2071 14280 | 2071 14280 | 3195 22030 | 3195 22030 | 4157 28663 | 5318 36668 | 6390 44059 | ||||||
| 8 Inch | 8.625 Inch 219 | 1420 9791 | 1574 10853 | 1829 12611 | 1829 12611 | 2307 15907 | 2841 19589 | 2841 19589 | 3375 23271 | 4085 28166 | 4613 31807 | 5147 35489 | 4971 34275 | |
| 10 Inch | 10.75 Inch 273 | 1140 7860 | 1399 9646 | 1664 11473 | 1664 11473 | 2279 15714 | 2279 15714 | 2708 18672 | 3277 22595 | 3847 26525 | 4558 31427 | 5128 35358 | 4558 31427 | |
| 12 Inch | 12.75 Inch 324 | 961 6626 | 1268 8743 | 1441 9936 | 1560 10756 | 2160 14893 | 1922 13252 | 2644 18230 | 3244 22367 | 3843 26497 | 4324 29814 | 5042 34765 | 3843 26497 | |
| 14 Inch | 14 Inch 356 | 875 6033 | 1092 7529 | 1313 9053 | 1313 9053 | 1533 10570 | 2079 14335 | 1750 12066 | 2625 18099 | 3283 22636 | 3829 26401 | 4375 30166 | 4921 33930 | |
| 16 Inch | 16 Inch 406 | 766 5282 | 956 6592 | 1148 7915 | 1148 7915 | 1531 10556 | 2009 13852 | 1531 10556 | 2585 17824 | 3157 21768 | 3733 25739 | 4404 30366 | 4882 33661 | |
| 18 Inch | 18 Inch 457 | 681 4695 | 849 5854 | 1192 8219 | 1021 7040 | 1530 10549 | 2042 14080 | 1361 9384 | 2553 17603 | 3147 21699 | 3743 25808 | 4252 29318 | 4848 33427 | |
| 20 Inch | 20 Inch 508 | 613 4227 | 919 6337 | 1225 8446 | 919 6337 | 1455 10032 | 1989 13714 | 1225 8446 | 2526 17417 | 3138 21637 | 3675 25339 | 4288 29566 | 4824 33261 | |
| 22 Inch | 22 Inch 559 | 557 3841 | 835 5757 | 1114 7681 | 835 5757 | 1949 13438 | 1114 7681 | 2506 17279 | 3063 21119 | 3619 24953 | 4176 28794 | 4733 32634 | ||
| 24 Inch | 24 Inch 610 | 510 3516 | 766 5282 | 1147 7909 | 766 5282 | 1405 9687 | 1978 13638 | 1021 7040 | 2489 17162 | 3126 21554 | 3700 25512 | 4210 29028 | 4786 32999 | |
| 30 Inch | 30 Inch 762 | 510 3516 | 817 5633 | 1021 7040 | 613 4227 | 817 5633 | ||||||||
| 32 Inch | 32 Inch 813 | 478 3296 | 766 5282 | 957 6599 | 574 3958 | 1054 7267 | ||||||||
| 34 Inch | 34 Inch 864 | 450 3103 | 721 4971 | 901 6212 | 540 3723 | 992 6840 | ||||||||
| 36 Inch | 36 Inch 914 | 425 2930 | 681 4695 | 851 5868 | 510 3516 | 1021 7040 | ||||||||
| 42 Inch | 42 Inch 1067 | 583 4020 | 729 5026 | 438 3020 | 875 6033 |
Read more: ASME B36.10 / B36.19 Steel Pipe Dimensions & Sizes or Out Diameter(OD) VS Nominal Diameter(NB)