Boiler & Condenser Tubes Reference: Inches
| Thickness of Wall in Birmingham Wire Gage and in Decimal Inches | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tube | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| OD | ID | .035 | .042 | .049 | .058 | .065 | .072 | .083 | .095 | .109 | .120 | .134 | .148 | .165 | .180 | .203 | .220 | .238 | .259 | .284 | .300 | .340 |
| 1/2 | Min. | .422 | .408 | .392 | .373 | .357 | .342 | .318 | .291 | .260 | .236 | |||||||||||
| Nom. | .430 | .416 | .402 | .384 | .370 | .356 | .334 | .310 | .282 | .260 | ||||||||||||
| 5/8 | Min. | .547 | .533 | .517 | .498 | .482 | .467 | .443 | .417 | .385 | .361 | .330 | .299 | .262 | .229 | |||||||
| Nom. | .555 | .541 | .527 | .509 | .495 | .481 | .459 | .435 | .407 | .385 | .357 | .329 | .295 | .265 | ||||||||
| 3/4 | Min. | .672 | .658 | .642 | .623 | .607 | .592 | .568 | .542 | .510 | .486 | .455 | .424 | .387 | .354 | .303 | .266 | .226 | .180 | |||
| Nom. | .680 | .666 | .652 | .634 | .620 | .606 | .584 | .560 | .532 | .510 | .482 | .454 | .420 | .390 | .344 | .310 | .274 | .232 | ||||
| 7/8 | Min. | .797 | .783 | .767 | .747 | .732 | .717 | .693 | .666 | .636 | .611 | .580 | .549 | .512 | .479 | .428 | .391 | .351 | .305 | |||
| Nom. | .805 | .791 | .777 | .759 | .745 | .731 | .709 | .685 | .657 | .635 | .607 | .579 | .545 | .515 | .469 | .435 | .399 | .357 | ||||
| 1 | Min. | .922 | .908 | .892 | .873 | .857 | .842 | .818 | .791 | .761 | .736 | .706 | .675 | .637 | .604 | .553 | .516 | .476 | .430 | .375 | .340 | .252 |
| Nom. | .930 | .916 | .902 | .884 | .870 | .856 | .834 | .810 | .782 | .760 | .732 | .704 | .670 | .640 | .594 | .560 | .524 | .482 | .432 | .400 | .320 | |
| 1-1/8 | Min. | 1.047 | 1.033 | 1.017 | .997 | .982 | .967 | .943 | .916 | .886 | .861 | .831 | .800 | .762 | .729 | .678 | .641 | .601 | .555 | .500 | .465 | .377 |
| Nom. | 1.055 | 1.041 | 1.027 | 1.009 | .995 | .981 | .959 | .935 | .907 | .885 | .857 | .829 | .795 | .765 | .719 | .685 | .649 | .607 | .557 | .525 | .445 | |
| 1-1/4 | Min. | 1.172 | 1.158 | 1.142 | 1.122 | 1.107 | 1.092 | 1.068 | 1.041 | 1.011 | .986 | .956 | .925 | .887 | .854 | .803 | .766 | .726 | .680 | .625 | .590 | .502 |
| Nom. | 1.180 | 1.166 | 1.152 | 1.134 | 1.120 | 1.106 | 1.084 | 1.060 | 1.032 | 1.010 | .982 | .954 | .920 | .890 | .844 | .810 | .774 | .732 | .682 | .650 | .570 | |
| 1-3/8 | Min. | 1.297 | 1.283 | 1.267 | 1.247 | 1.232 | 1.217 | 1.192 | 1.166 | 1.136 | 1.111 | 1.081 | 1.049 | 1.012 | .979 | .928 | .891 | .851 | .805 | .750 | .715 | .627 |
| Nom. | 1.305 | 1.291 | 1.277 | 1.259 | 1.245 | 1.231 | 1.209 | 1.185 | 1.157 | 1.135 | 1.107 | 1.079 | 1.045 | 1.015 | .969 | .935 | .899 | .857 | .807 | .775 | .695 | |
| 1-1/2 | Min. | 1.422 | 1.408 | 1.392 | 1.372 | 1.357 | 1.342 | 1.318 | 1.291 | 1.260 | 1.236 | 1.205 | 1.174 | 1.137 | 1.104 | 1.053 | 1.016 | .976 | .930 | .875 | .840 | .752 |
| Nom. | 1.430 | 1.426 | 1.402 | 1.384 | 1.370 | 1.356 | 1.334 | 1.310 | 1.282 | 1.260 | 1.232 | 1.204 | 1.170 | 1.140 | 1.094 | 1.060 | 1.024 | .982 | .932 | .900 | .820 | |
| 1-3/4 | Min. | 1.672 | 1.658 | 1.642 | 1.622 | 1.607 | 1.592 | 1.568 | 1.541 | 1.510 | 1.486 | 1.455 | 1.424 | 1.387 | 1.354 | 1.303 | 1.266 | 1.226 | 1.180 | 1.125 | 1.090 | 1.002 |
| Nom. | 1.680 | 1.666 | 1.652 | 1.634 | 1.620 | 1.606 | 1.584 | 1.560 | 1.532 | 1.510 | 1.482 | 1.454 | 1.420 | 1.390 | 1.344 | 1.310 | 1.274 | 1.232 | 1.182 | 1.150 | 1.070 | |
| 2 | Min. | 1.922 | 1.908 | 1.892 | 1.872 | 1.857 | 1.842 | 1.817 | 1.791 | 1.760 | 1.736 | 1.705 | 1.674 | 1.637 | 1.604 | 1.553 | 1.516 | 1.476 | 1.430 | 1.375 | 1.340 | 1.252 |
| Nom. | 1.930 | 1.916 | 1.902 | 1.884 | 1.870 | 1.856 | 1.834 | 1.810 | 1.782 | 1.760 | 1.732 | 1.704 | 1.670 | 1.640 | 1.594 | 1.560 | 1.524 | 1.482 | 1.432 | 1.400 | 1.320 | |
| 2-1/4 | Min. | 2.172 | 2.158 | 2.142 | 2.122 | 2.107 | 2.092 | 2.067 | 2.041 | 2.010 | 1.986 | 1.955 | 1.924 | 1.887 | 1.854 | 1.803 | 1.766 | 1.726 | 1.680 | 1.625 | 1.590 | 1.502 |
| Nom. | 2.180 | 2.166 | 2.152 | 2.134 | 2.120 | 2.106 | 2.084 | 2.060 | 2.032 | 2.010 | 1.982 | 1.954 | 1.920 | 1.890 | 1.844 | 1.810 | 1.774 | 1.732 | 1.682 | 1.650 | 1.570 | |
| 2-1/2 | Min. | 2.422 | 2.408 | 2.392 | 2.372 | 2.357 | 2.342 | 2.317 | 2.291 | 2.260 | 2.236 | 2.205 | 2.174 | 2.137 | 2.104 | 2.053 | 2.016 | 1.976 | 1.930 | 1.875 | 1.840 | 1.752 |
| Nom. | 2.430 | 2.416 | 2.402 | 2.384 | 2.370 | 2.356 | 2.334 | 2.310 | 2.282 | 2.260 | 2.232 | 2.204 | 2.170 | 2.140 | 2.094 | 2.060 | 2.024 | 1.982 | 1.932 | 1.900 | 1.820 | |
| 2-3/4 | Min. | 2.672 | 2.658 | 2.642 | 2.622 | 2.607 | 2.592 | 2.567 | 2.541 | 2.510 | 2.486 | 2.455 | 2.424 | 2.387 | 2.354 | 2.303 | 2.266 | 2.226 | 2.180 | 2.125 | 2.090 | 2.002 |
| Nom. | 2.680 | 2.666 | 2.652 | 2.634 | 2.620 | 2.606 | 2.584 | 2.560 | 2.532 | 2.510 | 2.482 | 2.454 | 2.420 | 2.390 | 2.344 | 2.310 | 2.274 | 2.232 | 2.182 | 2.150 | 2.070 | |
| 3 | Min. | 2.922 | 2.908 | 2.892 | 2.872 | 2.857 | 2.842 | 2.817 | 2.791 | 2.760 | 2.736 | 2.705 | 2.674 | 2.636 | 2.604 | 2.553 | 2.516 | 2.476 | 2.430 | 2.375 | 2.340 | 2.252 |
| Nom. | 2.930 | 2.916 | 2.902 | 2.884 | 2.870 | 2.856 | 2.834 | 2.810 | 2.782 | 2.760 | 2.732 | 2.704 | 2.670 | 2.640 | 2.594 | 2.560 | 2.524 | 2.482 | 2.432 | 2.400 | 2.320 | |
| 3-1/4 | Min. | 3.172 | 3.158 | 3.142 | 3.122 | 3.107 | 3.092 | 3.067 | 3.041 | 3.010 | 2.986 | 2.955 | 2.924 | 2.887 | 2.854 | 2.803 | 2.766 | 2.726 | 2.680 | 2.625 | 2.590 | 2.502 |
| Nom. | 3.180 | 3.166 | 3.152 | 3.134 | 3.120 | 3.106 | 3.084 | 3.060 | 3.032 | 3.010 | 2.982 | 2.954 | 2.920 | 2.890 | 2.844 | 2.810 | 2.774 | 2.732 | 2.682 | 2.650 | 2.570 | |
| 3-1/2 | Min. | 3.422 | 3.408 | 3.392 | 3.372 | 3.357 | 3.342 | 3.317 | 3.291 | 3.260 | 3.236 | 3.205 | 3.174 | 3.137 | 3.104 | 3.053 | 3.016 | 2.976 | 2.930 | 2.875 | 2.840 | 2.752 |
| Nom. | 3.430 | 3.416 | 3.402 | 3.384 | 3.370 | 3.356 | 3.334 | 3.310 | 3.282 | 3.260 | 3.232 | 3.204 | 3.170 | 3.140 | 3.094 | 3.060 | 3.024 | 2.982 | 2.932 | 2.900 | 2.820 | |
| 3-3/4 | Min. | 3.672 | 3.658 | 3.642 | 3.622 | 3.607 | 3.592 | 3.567 | 3.541 | 3.510 | 3.486 | 3.455 | 3.424 | 3.387 | 3.354 | 3.303 | 3.266 | 3.226 | 3.180 | 3.125 | 3.090 | 3.002 |
| Nom. | 3.680 | 3.666 | 3.652 | 3.634 | 3.620 | 3.606 | 3.584 | 3.560 | 3.532 | 3.510 | 3.482 | 3.454 | 3.420 | 3.390 | 3.344 | 3.310 | 3.274 | 3.232 | 3.182 | 3.150 | 3.070 | |
| 4 | Min. | 3.922 | 3.908 | 3.892 | 3.872 | 3.857 | 3.842 | 3.817 | 3.791 | 3.760 | 3.736 | 3.705 | 3.674 | 3.637 | 3.604 | 3.553 | 3.516 | 3.476 | 3.430 | 3.375 | 3.340 | 3.252 |
| Nom. | 3.930 | 3.916 | 3.902 | 3.884 | 3.870 | 3.856 | 3.834 | 3.810 | 3.782 | 3.760 | 3.732 | 3.704 | 3.670 | 3.640 | 3.594 | 3.560 | 3.524 | 3.482 | 3.432 | 3.400 | 3.320 | |
| 4-1/2 | Min. | 4.422 | 4.408 | 4.392 | 4.372 | 4.357 | 4.342 | 4.317 | 4.291 | 4.260 | 4.236 | 4.205 | 4.174 | 4.137 | 4.104 | 4.053 | 4.016 | 3.976 | 3.930 | 3.875 | 3.840 | 3.752 |
| Nom. | 4.430 | 4.416 | 4.402 | 4.384 | 4.370 | 4.356 | 4.334 | 4.310 | 4.282 | 4.260 | 4.232 | 4.204 | 4.170 | 4.140 | 4.094 | 4.060 | 4.024 | 3.982 | 3.932 | 3.900 | 3.820 | |
| 5 | Min. | 4.922 | 4.908 | 4.892 | 4.872 | 4.857 | 4.842 | 4.817 | 4.791 | 4.760 | 4.736 | 4.705 | 4.674 | 4.637 | 4.604 | 4.553 | 4.516 | 4.476 | 4.430 | 4.375 | 4.340 | 4.252 |
| Nom. | 4.930 | 4.916 | 4.902 | 4.884 | 4.870 | 4.856 | 4.834 | 4.810 | 4.782 | 4.760 | 4.732 | 4.704 | 4.670 | 4.640 | 4.594 | 4.560 | 4.524 | 4.482 | 4.432 | 4.400 | 4.320 | |