2.10.5 Design of Air Scour Pumps & Pipes

Air Scour Rate = 55 M3/M2/H
= 180.36 Ft3 /Ft2/Hr
Area of each Filter Bed = 607.60 Sft
Air Flow Rate = 180.36 x 607.60
= 109587 Cft / Hr
Say = 3200 M3/H
= 53.33 M3 / Min

Provide 2 No Air Blowers (1 operational /1 standby) each having capacity 3200 M3/H @ 650 mbar

Design of Air Flow Pipe

Dia of Air Flow Pipe = 8” (0.20 M)

X- Sectional Area of the Aeration Pipe = 0.350 Sft (0.0325 M2)
Velocity through the Air Flow Pipe = 109587 / 60 x 0.350
= 5218.42 Ft / Min
= 1591.0 M /Min