The Chicago Plumbing Code

Table § 18-29-705.1.1

Wall Thickness of Glass Pipe and Fittings

Standard Schedule

Heavy Schedule

Inches

Millimeters

Inches

Millimeters

1 1/2 - 0.12

38 mm - 3 mm

1 1/2 - 0.17

38 mm - 4 mm

2 - 0.14

50 mm - 4 mm

2 - 0.17

50 mm - 4 mm

3 - 0.17

75 mm - 4 mm

3 - 0.20

75 mm - 5 mm

4 - 0.20

100 mm - 5 mm

4 - 0.26

100 mm - 7 mm

6 - 0.24

150 mm - 6 mm

6 - 0.33

150 mm - 8 mm