A312 TP347 Pipe MAWP Calculator ASTM A312 TP347 SS Pipe Smls 18Cr-10Ni-Cb
Material Properties Description
ASTM A312 TP347 SS Pipe Smls 18Cr-10Ni-Cb
Min Design Temperature
-425 °F
Y Coefficient
Ref 4 — Austenitic steels
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 6,659 6,659 6,659 6,659 6,659 6,426 6,226 6,093 1/4 0.54 6,438 6,438 6,438 6,438 6,438 6,213 6,020 5,891 3/8 0.675 5,210 5,210 5,210 5,210 5,210 5,028 4,872 4,767 1/2 0.84 4,995 4,995 4,995 4,995 4,995 4,821 4,671 4,571 3/4 1.05 4,074 4,074 4,074 4,074 4,074 3,931 3,809 3,727 1 1.315 3,810 3,810 3,810 3,810 3,810 3,676 3,562 3,486 1 1/4 1.66 3,137 3,137 3,137 3,137 3,137 3,027 2,933 2,870 1 1/2 1.9 2,822 2,822 2,822 2,822 2,822 2,723 2,638 2,582 2 2.375 2,377 2,377 2,377 2,377 2,377 2,294 2,223 2,175 2 1/2 2.875 2,600 2,600 2,600 2,600 2,600 2,509 2,431 2,379 3 3.5 2,258 2,258 2,258 2,258 2,258 2,179 2,111 2,066 3.5 4 2,059 2,059 2,059 2,059 2,059 1,987 1,925 1,884 4 4.5 1,914 1,914 1,914 1,914 1,914 1,847 1,789 1,751 5 5.563 1,678 1,678 1,678 1,678 1,678 1,619 1,569 1,535 6 6.625 1,524 1,524 1,524 1,524 1,524 1,471 1,425 1,395 7 7.625 1,421 1,421 1,421 1,421 1,421 1,371 1,329 1,300 8 8.625 1,342 1,342 1,342 1,342 1,342 1,295 1,255 1,228 9 9.625 1,275 1,275 1,275 1,275 1,275 1,231 1,192 1,167 10 10.75 1,217 1,217 1,217 1,217 1,217 1,175 1,138 1,114 12 12.75 1,051 1,051 1,051 1,051 1,051 1,014 983 962 14 14 955 955 955 955 955 922 893 874 16 16 834 834 834 834 834 805 780 763 18 18 740 740 740 740 740 714 692 677 20 20 665 665 665 665 665 642 622 608 22 22 604 604 604 604 604 583 565 552 24 24 553 553 553 553 553 534 517 506 26 26 510 510 510 510 510 492 477 467 28 28 473 473 473 473 473 457 442 433 30 30 441 441 441 441 441 426 413 404 36 36 367 367 367 367 367 354 343 336 42 42 314 314 314 314 314 303 294 288 44 44 300 300 300 300 300 290 281 275 46 46 287 287 287 287 287 277 268 263 48 48 275 275 275 275 275 265 257 252
Allowable Stress vs Temperature 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 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 
