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Steel Welded Pipe - Pressure & Temperature Ratings

Maximum Allowable Working Pressure (PSI) at Design Temperature (F)

ASTM A53 Grade B Carbon Steel ERW Welded, Threaded Pipe Nipples
For Reference Only

Nominal Pipe Size Wall Thickness Weight Class Schedule Number System Temperature
-20 200 300 400 500 600 650
to 100
  1/8 0.068 Standard 40 2,510 2,510 2,510 2,510 2,375 2,170 2,135
0.095 Extra Heavy 80 4,655 4,655 4,655 4,655 4,400 4,025 3,960
  1/4 0.088 Standard 40 2,030 2,030 2,030 2,030 1,920 1,755 1,725
0.119 Extra Heavy 80 3,845 3,845 3,845 3,845 3,635 3,325 3,270
  3/8 0.091 Standard 40 1,745 1,745 1,745 1,745 1,645 1,505 1,480
0.126 Extra Heavy 80 3,385 3,385 3,385 3,385 3,200 2,930 2,880
  1/2 0.109 Standard 40 1,515 1,515 1,515 1,515 1,430 1,310 1,285
0.147 Extra Heavy 80 2,925 2,925 2,925 2,925 2,765 2,530 2,485
  3/4 0.113 Standard 40 1,315 1,315 1,315 1,315 1,245 1,135 1,120
0.154 Extra Heavy 80 2,515 2,515 2,515 2,515 2,380 2,175 2,140
1 0.133 Standard 40 1,170 1,170 1,170 1,170 1,105 1,015 995
0.179 Extra Heavy 80 2,235 2,235 2,235 2,235 2,115 1,935 1,900
1 1/4 0.140 Standard 40 1,045 1,045 1,045 1,045 990 905 890
0.191 Extra Heavy 80 1,975 1,975 1,975 1,975 1,865 1,705 1,675
1 1/2 0.145 Standard 40 990 990 990 990 935 855 840
0.200 Extra Heavy 80 1,860 1,860 1,860 1,860 1,755 1,605 1,580
2 0.154 Standard 40 900 900 900 900 850 775 765
0.218 Extra Heavy 80 1,700 1,700 1,700 1,700 1,610 1,470 1,445
2 1/2 0.203 Standard 40 885 885 885 885 835 765 750
0.276 Extra Heavy 80 1,640 1,640 1,640 1,640 1,550 1,420 1,395
3 0.216 Standard 40 830 830 830 830 785 720 705
0.300 Extra Heavy 80 1,545 1,545 1,545 1,545 1,460 1,335 1,310
3 1/2 0.226 Standard 40 800 800 800 800 755 690 680
0.318 Extra Heavy 80 1,480 1,480 1,480 1,480 1,395 1,280 1,255
4 0.237 Standard 40 780 780 780 780 735 675 660
0.337 Extra Heavy 80 1,435 1,435 1,435 1,435 1,355 1,240 1,220

Please Note:
1. The allowable working pressures were calculated based on formulas and allowable stress as specified in the ASME B31.3 process.
2. Considerations were taken into account for the wall thickness material removed by threading.
3. No allowances were made for corrosion, erosion, mechanical loads, and/or bending moments.
4. Allowable working pressures listed are non-shock working pressures.
5. For Temperatures and working pressures above those listed consult the end users piping engineer.
6. This information is to be used as a reference guide only. Specifying the correct pipe schedule and pressure class of fitting depend on many different factors. Therefore, it is the ultimate responsibility of the end user's piping engineer to specify the correct pipe schedule and pressure class of fitting that will safely work in his intended application.

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