B161 N02201 Pipe MAWP Calculator ASTM B161 N02201 (201) Pipe SMLS 99.0Ni-Low C, <=5" O.D. annealed
Size Variant OD <= 5 in. OD > 5 in.
Material Properties Description
ASTM B161 N02201 (201) Pipe SMLS 99.0Ni-Low C, <=5" O.D. annealed
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 2,664 2,564 2,497 2,497 2,497 2,497 2,464 2,397 1/4 0.54 2,575 2,479 2,414 2,414 2,414 2,414 2,382 2,318 3/8 0.675 2,084 2,006 1,954 1,954 1,954 1,954 1,928 1,876 1/2 0.84 1,998 1,923 1,873 1,873 1,873 1,873 1,848 1,798 3/4 1.05 1,629 1,568 1,528 1,528 1,528 1,528 1,507 1,466 1 1.315 1,524 1,467 1,429 1,429 1,429 1,429 1,410 1,371 1 1/4 1.66 1,255 1,208 1,176 1,176 1,176 1,176 1,161 1,129 1 1/2 1.9 1,129 1,086 1,058 1,058 1,058 1,058 1,044 1,016 2 2.375 951 915 892 892 892 892 880 856 2 1/2 2.875 1,040 1,001 975 975 975 975 962 936 3 3.5 903 869 847 847 847 847 835 813 3.5 4 824 793 772 772 772 772 762 741 4 4.5 766 737 718 718 718 718 708 689 5 5.563 671 646 629 629 629 629 621 604 6 6.625 610 587 572 572 572 572 564 549 7 7.625 568 547 533 533 533 533 526 512 8 8.625 537 517 503 503 503 503 496 483 9 9.625 510 491 478 478 478 478 472 459 10 10.75 487 469 456 456 456 456 450 438 12 12.75 420 405 394 394 394 394 389 378 14 14 382 368 358 358 358 358 354 344 16 16 334 321 313 313 313 313 309 300 18 18 296 285 277 277 277 277 274 266 20 20 266 256 249 249 249 249 246 239 22 22 242 232 226 226 226 226 223 217 24 24 221 213 207 207 207 207 205 199 26 26 204 196 191 191 191 191 189 184 28 28 189 182 177 177 177 177 175 170 30 30 177 170 166 166 166 166 163 159 36 36 147 141 138 138 138 138 136 132 42 42 126 121 118 118 118 118 116 113 44 44 120 116 113 113 113 113 111 108 46 46 115 110 108 108 108 108 106 103 48 48 110 106 103 103 103 103 102 99
Allowable Stress vs Temperature 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 1000 1100 1200 Temperature (°F) 0 2 4 6 8 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 
