The Chicago Plumbing Code

Table § 18-29-712.4.1

Minimum Capacity of Sewage Pump or Sewage Ejector

Diameter of the Discharge Pipe (inches)

Capacity of Pump or Ejector (gpm)

2

21

2 1/2

30

3

46

For SI: 1 inch = 25.4 mm, 1 gpm = 3.785 L/m.