B165 N04400 Pipe MAWP Calculator ASTM B165 N04400 (400 Monel) Pipe SMLS 67Ni-30Cu, <=5" O.D. annealed
Material Properties Description
ASTM B165 N04400 (400 Monel) Pipe SMLS 67Ni-30Cu, <=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 6,226 5,461 5,061 4,895 4,895 4,895 4,861 4,761 1/4 0.54 6,020 5,279 4,893 4,732 4,732 4,732 4,700 4,603 3/8 0.675 4,872 4,272 3,960 3,830 3,830 3,830 3,803 3,725 1/2 0.84 4,671 4,096 3,797 3,672 3,672 3,672 3,647 3,572 3/4 1.05 3,809 3,340 3,096 2,994 2,994 2,994 2,974 2,913 1 1.315 3,562 3,124 2,895 2,800 2,800 2,800 2,781 2,724 1 1/4 1.66 2,933 2,572 2,384 2,306 2,306 2,306 2,290 2,243 1 1/2 1.9 2,638 2,314 2,145 2,074 2,074 2,074 2,060 2,018 2 2.375 2,223 1,949 1,807 1,747 1,747 1,747 1,735 1,700 2 1/2 2.875 2,431 2,132 1,976 1,911 1,911 1,911 1,898 1,859 3 3.5 2,111 1,851 1,716 1,659 1,659 1,659 1,648 1,614 3.5 4 1,925 1,688 1,565 1,513 1,513 1,513 1,503 1,472 4 4.5 1,789 1,569 1,455 1,407 1,407 1,407 1,397 1,368 5 5.563 1,569 1,376 1,275 1,233 1,233 1,233 1,225 1,200 6 6.625 1,425 1,250 1,159 1,120 1,120 1,120 1,113 1,090 7 7.625 1,329 1,165 1,080 1,044 1,044 1,044 1,037 1,016 8 8.625 1,255 1,100 1,020 986 986 986 979 959 9 9.625 1,192 1,046 969 937 937 937 931 912 10 10.75 1,138 998 925 895 895 895 889 870 12 12.75 983 862 799 773 773 773 767 752 14 14 893 783 726 702 702 702 697 683 16 16 780 684 634 613 613 613 609 596 18 18 692 607 562 544 544 544 540 529 20 20 622 545 505 489 489 489 485 475 22 22 565 495 459 444 444 444 441 432 24 24 517 453 420 406 406 406 404 395 26 26 477 418 388 375 375 375 372 365 28 28 442 388 360 348 348 348 345 338 30 30 413 362 335 324 324 324 322 316 36 36 343 301 279 270 270 270 268 263 42 42 294 258 239 231 231 231 230 225 44 44 281 246 228 221 221 221 219 215 46 46 268 235 218 211 211 211 209 205 48 48 257 225 209 202 202 202 201 197
Allowable Stress vs Temperature 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 Temperature (°F) 0 5 10 15 20 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 
