Section R. 325.1631a - Construction of wells; PVC casing dimensionsRule 131a.
(1) PVC pipe that is used as permanent casing shall be new pipe that is manufactured in compliance with the standards of ASTM specification F 480-90, which is adopted by reference in R 325.1610.(2) PVC pipe that is used as permanent casing shall be SDR 21 or heavier. PVC pipe that is installed at depths of more than 200 feet shall be SDR 17 or heavier.(3) PVC pipe that is used as permanent well casing shall have an outside diameter and minimum wall thickness as specified in table 3. Dimensional standards for PVC pipe are specified in ASTM specification F 480-90. Table 3
Diameter and Wall Thickness of PVC Well Casing and Liners
| Minimum Wall |
| Nominal Pipe Size (inches) | Outside Diameter (inches) | Thickness (inches) SDR 21 | SDR 17 |
| 2 | Liner Pipe | 2.375 | .113 | .140 |
| 3 | Only | 3.500 | .167 | .206 |
| 4 | 4.500 | .214 | .265 |
| 5 | 5.563 | .265 | .327 |
| 6 | 6.625 | .316 | .390 |
| 8 | 8.625 | .410 | .508 |
| 10 | 10.750 | .511 | .632 |
| 12 | 12.750 | .606 | .750 |
| 14 | 14.00 | .667 | -- |
| 16 | 16.00 | .762 | -- |
Mich. Admin. Code R. 325.1631a