Module 4 — Water Well Drilling Agreements
33
Plastic Well Casing—Required Thickness for ABS or PVC
Outside Pipe
Diameter
in. (mm)
Casing Schedule
(
SCH) Number
Minimum Wall
Thickness
in. (mm)
4.5
(114.3)
4.95 (125.7)
SDR21
SCH 40
0.214 (5.43)
0.260 (6.60)
5
Nominal
(127.0)
5.56 (141.2)
SCH 80
0.397 (10.1)
6
(152.4)
6.625 (168.3)
6.625 (168.3)
WellCasing
SCH 40
SCH 80
0.390 (9.9)
0.432 (11.0)
0.280 (7.1)
8.625 (219.7)
8.625 (219.7)
SCH 40
SCH 80
0.322 (8.2)
0.5
(12.7)
10.75 (273.1)
10.75 (273.1)
SCH 40
SCH 80
0.365 (9.2)
0.593 (15.1)
Non-Plastic Well Casing—Required Thickness
Type of Well Casing Minimum Casing Thickness
Metal well casing
0.188
in.(4.78mm)
Metal liner casing
0.156
in. (3.96mm)
Cement-like casing
*
for 24in.(60.96 cm)
casing or less
*
for casings larger than
24
in.
* 2.5
in.(6.35cm)
* 2.5
in.plus 1in.forevery
additional foot of well diameter
Corrugated and
galvanized steel casing
16
gauge
Water Well Casing Specifications
Materials
All well casing material must meet or exceed the specifications set for that material and purpose by the Canadian Standards
Association or the American Society for Testing and Materials.