B622 N10665 Pipe MAWP Calculator ASTM B622 N10665 (B2) Pipe SMLS, 65Ni-28Mo-2Fe, Sol. Ann.
Material Properties Description
ASTM B622 N10665 (B2) Pipe SMLS, 65Ni-28Mo-2Fe, Sol. Ann.
Min Design Temperature
-325 °F
Y Coefficient
Ref 5 — Other ductile metals
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 11,321 11,321 11,321 11,321 11,321 11,321 11,321 11,321 1/4 0.54 10,945 10,945 10,945 10,945 10,945 10,945 10,945 10,945 3/8 0.675 8,857 8,857 8,857 8,857 8,857 8,857 8,857 8,857 1/2 0.84 8,492 8,492 8,492 8,492 8,492 8,492 8,492 8,492 3/4 1.05 6,925 6,925 6,925 6,925 6,925 6,925 6,925 6,925 1 1.315 6,476 6,476 6,476 6,476 6,476 6,476 6,476 6,476 1 1/4 1.66 5,333 5,333 5,333 5,333 5,333 5,333 5,333 5,333 1 1/2 1.9 4,797 4,797 4,797 4,797 4,797 4,797 4,797 4,797 2 2.375 4,042 4,042 4,042 4,042 4,042 4,042 4,042 4,042 2 1/2 2.875 4,420 4,420 4,420 4,420 4,420 4,420 4,420 4,420 3 3.5 3,838 3,838 3,838 3,838 3,838 3,838 3,838 3,838 3.5 4 3,500 3,500 3,500 3,500 3,500 3,500 3,500 3,500 4 4.5 3,254 3,254 3,254 3,254 3,254 3,254 3,254 3,254 5 5.563 2,852 2,852 2,852 2,852 2,852 2,852 2,852 2,852 6 6.625 2,591 2,591 2,591 2,591 2,591 2,591 2,591 2,591 7 7.625 2,416 2,416 2,416 2,416 2,416 2,416 2,416 2,416 8 8.625 2,281 2,281 2,281 2,281 2,281 2,281 2,281 2,281 9 9.625 2,168 2,168 2,168 2,168 2,168 2,168 2,168 2,168 10 10.75 2,069 2,069 2,069 2,069 2,069 2,069 2,069 2,069 12 12.75 1,787 1,787 1,787 1,787 1,787 1,787 1,787 1,787 14 14 1,624 1,624 1,624 1,624 1,624 1,624 1,624 1,624 16 16 1,418 1,418 1,418 1,418 1,418 1,418 1,418 1,418 18 18 1,258 1,258 1,258 1,258 1,258 1,258 1,258 1,258 20 20 1,130 1,130 1,130 1,130 1,130 1,130 1,130 1,130 22 22 1,026 1,026 1,026 1,026 1,026 1,026 1,026 1,026 24 24 940 940 940 940 940 940 940 940 26 26 867 867 867 867 867 867 867 867 28 28 804 804 804 804 804 804 804 804 30 30 750 750 750 750 750 750 750 750 36 36 624 624 624 624 624 624 624 624 42 42 535 535 535 535 535 535 535 535 44 44 510 510 510 510 510 510 510 510 46 46 488 488 488 488 488 488 488 488 48 48 467 467 467 467 467 467 467 467
Allowable Stress vs Temperature 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 Temperature (°F) 0 9 18 27 36 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 
