B423 N08825 Pipe MAWP Calculator ASTM B423 N08825 (825) Pipe SMLS, 42Ni-21.5Cr-3Mo-2.3Cu, C.D. ann
Material Properties Description
ASTM B423 N08825 (825) Pipe SMLS, 42Ni-21.5Cr-3Mo-2.3Cu, C.D. ann
Min Design Temperature
-325 °F
Y Coefficient
Ref 7 — Nickel alloys: N06617, N08800, N08810, N08825
Maximum Allowable Working Pressure (psig) Sch STD Sch XS Sch 160
NPS OD (in) 100 °F 200 °F 300 °F 400 °F 500 °F 600 °F 700 °F 800 °F 1/8 0.405 7,758 7,758 7,758 7,758 7,758 7,758 7,758 7,658 1/4 0.54 7,500 7,500 7,500 7,500 7,500 7,500 7,500 7,404 3/8 0.675 6,070 6,070 6,070 6,070 6,070 6,070 6,070 5,992 1/2 0.84 5,820 5,820 5,820 5,820 5,820 5,820 5,820 5,745 3/4 1.05 4,746 4,746 4,746 4,746 4,746 4,746 4,746 4,685 1 1.315 4,438 4,438 4,438 4,438 4,438 4,438 4,438 4,381 1 1/4 1.66 3,655 3,655 3,655 3,655 3,655 3,655 3,655 3,608 1 1/2 1.9 3,287 3,287 3,287 3,287 3,287 3,287 3,287 3,245 2 2.375 2,770 2,770 2,770 2,770 2,770 2,770 2,770 2,734 2 1/2 2.875 3,029 3,029 3,029 3,029 3,029 3,029 3,029 2,990 3 3.5 2,630 2,630 2,630 2,630 2,630 2,630 2,630 2,596 3.5 4 2,399 2,399 2,399 2,399 2,399 2,399 2,399 2,368 4 4.5 2,230 2,230 2,230 2,230 2,230 2,230 2,230 2,201 5 5.563 1,955 1,955 1,955 1,955 1,955 1,955 1,955 1,929 6 6.625 1,776 1,776 1,776 1,776 1,776 1,776 1,776 1,753 7 7.625 1,655 1,655 1,655 1,655 1,655 1,655 1,655 1,634 8 8.625 1,563 1,563 1,563 1,563 1,563 1,563 1,563 1,543 9 9.625 1,486 1,486 1,486 1,486 1,486 1,486 1,486 1,467 10 10.75 1,418 1,418 1,418 1,418 1,418 1,418 1,418 1,400 12 12.75 1,224 1,224 1,224 1,224 1,224 1,224 1,224 1,209 14 14 1,113 1,113 1,113 1,113 1,113 1,113 1,113 1,099 16 16 972 972 972 972 972 972 972 959 18 18 862 862 862 862 862 862 862 851 20 20 775 775 775 775 775 775 775 765 22 22 703 703 703 703 703 703 703 694 24 24 644 644 644 644 644 644 644 636 26 26 594 594 594 594 594 594 594 586 28 28 551 551 551 551 551 551 551 544 30 30 514 514 514 514 514 514 514 508 36 36 428 428 428 428 428 428 428 422 42 42 366 366 366 366 366 366 366 362 44 44 350 350 350 350 350 350 350 345 46 46 334 334 334 334 334 334 334 330 48 48 320 320 320 320 320 320 320 316
Allowable Stress vs Temperature 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 Temperature (°F) 0 6 12 18 24 Allowable Stress (ksi) Disclaimer: This calculator is for guidance only. Results are based on ASME B31.3-2024 allowable stresses for seamless pipe (Ej=1.0, W=1.0). Always verify against the current edition of the standard. The engineer of record is responsible for all design decisions.
References ASME B31.3-2024 — Process Piping, Table A-1 ASME B36.10M — Welded and Seamless Wrought Steel Pipe ASME B16.5-2020 — Pipe Flanges and Flanged Fittings 
