A312 TP310S Pipe MAWP Calculator ASTM A312 TP310S SS Pipe Smls 25Cr-20Ni
Material Properties Description
ASTM A312 TP310S SS Pipe Smls 25Cr-20Ni
Min Design Temperature
-325 °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 6,426 6,160 5,960 5,794 1/4 0.54 6,438 6,438 6,438 6,438 6,213 5,955 5,762 5,601 3/8 0.675 5,210 5,210 5,210 5,210 5,028 4,819 4,663 4,533 1/2 0.84 4,995 4,995 4,995 4,995 4,821 4,621 4,471 4,346 3/4 1.05 4,074 4,074 4,074 4,074 3,931 3,768 3,646 3,544 1 1.315 3,810 3,810 3,810 3,810 3,676 3,524 3,410 3,314 1 1/4 1.66 3,137 3,137 3,137 3,137 3,027 2,902 2,808 2,729 1 1/2 1.9 2,822 2,822 2,822 2,822 2,723 2,610 2,526 2,455 2 2.375 2,377 2,377 2,377 2,377 2,294 2,199 2,128 2,068 2 1/2 2.875 2,600 2,600 2,600 2,600 2,509 2,405 2,327 2,262 3 3.5 2,258 2,258 2,258 2,258 2,179 2,088 2,020 1,964 3.5 4 2,059 2,059 2,059 2,059 1,987 1,905 1,843 1,791 4 4.5 1,914 1,914 1,914 1,914 1,847 1,770 1,713 1,665 5 5.563 1,678 1,678 1,678 1,678 1,619 1,552 1,502 1,460 6 6.625 1,524 1,524 1,524 1,524 1,471 1,410 1,364 1,326 7 7.625 1,421 1,421 1,421 1,421 1,371 1,314 1,272 1,236 8 8.625 1,342 1,342 1,342 1,342 1,295 1,241 1,201 1,167 9 9.625 1,275 1,275 1,275 1,275 1,231 1,180 1,141 1,110 10 10.75 1,217 1,217 1,217 1,217 1,175 1,126 1,089 1,059 12 12.75 1,051 1,051 1,051 1,051 1,014 972 941 914 14 14 955 955 955 955 922 884 855 831 16 16 834 834 834 834 805 771 746 726 18 18 740 740 740 740 714 684 662 644 20 20 665 665 665 665 642 615 595 579 22 22 604 604 604 604 583 559 540 525 24 24 553 553 553 553 534 511 495 481 26 26 510 510 510 510 492 472 456 444 28 28 473 473 473 473 457 438 424 412 30 30 441 441 441 441 426 408 395 384 36 36 367 367 367 367 354 340 329 320 42 42 314 314 314 314 303 291 281 274 44 44 300 300 300 300 290 278 269 261 46 46 287 287 287 287 277 265 257 250 48 48 275 275 275 275 265 254 246 239
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 
