The table below shows sizing & pressure ratings, for typical aquarium builds. Using schedule 80 PVC pipe dimensions
| Pipe Size | O.D. | Avarage I.D. | Minimum Wall | Wt./Ft. | Maximun P.S.I. |
|---|---|---|---|---|---|
| 1/8" | 0.405" | 0.195" | 0.095" | 0.068 | 1230 |
| 1/4" | 0.540" | 0.282" | 0.119" | 0.115 | 1130 |
| 3/8" | 0.675" | 0.403" | 0.126" | 0.158 | 920 |
| 1/2" | 0.840" | 0.528" | 0.147" | 0.232 | 850 |
| 3/4" | 1.050" | 0.722" | 0.154" | 0.314 | 690 |
| 1" | 1.315" | 0.936" | 0.179" | 0.461 | 830 |
| 1 1/4" | 1.660" | 1.255" | 0.191" | 0.638 | 520 |
| 1 1/2" | 1.900" | 1.476 | 0.200" | 0.773 | 470 |
| 2" | 2.375" | 1.913" | 0.218" | 1.07 | 400 |
| 2 1/2" | 2.845" | 2.290" | 0.276" | 1.632 | 420 |
| 3" | 3.500" | 2.864" | 0.300" | 2.186 | 370 |
| 4" | 4.500" | 3.786" | 0.337" | 3.196 | 320 |
| 6" | 6.625" | 5.709" | 0.432" | 6.102 | 280 |
| 8" | 8.625" | 7.565" | 0.500" | 9.269 | 250 |
| 10" | 10.750" | 9.493" | 0.593" | 13.744 | 230 |
| 12" | 12.750" | 11.294" | 0.687" | 18.909 | 230 |
| 14" | 14.000" | 12.410" | 0.750" | 22.681 | 220 |
| 16" | 16.000" | 14.213" | 0.843" | 29.162 | 220 |
| 18" | 18.000" | 16.014" | 0.937" | 36.487 | 220 |
| 20" | 20.000" | 17.814" | 1.031" | 44.648 | 220 |
| 24" | 24.000" | 21.418 | 1.218" | 63.341 | 210 |