Waste Water - Flow Capacity

In sewage piping and pumping systems the fluid flow rate must be kept within certain limits to avoid operating problems

In sewage piping and pumping systems the flow velocity must exceed certain limits to maintain trouble free operation and to avoid settling and sedimentation of solids:

  • for horizontal wastewater pipe systems with solids the speed should exceed 3 ft/sec
  • for wastewater water system with organic solids the speed should exceed 2 ft/sec

On the other hand, the flow velocity should not exceed certain limits to avoid potential wear and tear due to erosion and abrasion:

  • the flow velocity in high-grit sewage handling systems should not exceed 12 ft/sec
  • the flow velocity in sewage systems with low grit concentrations should not exceed 18 ft/sec

Flow rate capacities in US gal for sewage piping and pumping systems within the limitations:

Flow Rate (US GPM)
Pipe Dimension
Minimum VelocityMaximum Velocity
2 ft/sec
(0.6 m/s)
3 ft/sec
(0.9 m/s)
12 ft/sec
(3.6 m/s)
18 ft/sec
(5.4 m/s)
3 45 65 270 400
4 80 120 480 700
6 180 260 1050 1600
8 300 500 1900 2800
10 500 750 3000 4400
12 700 1100 4300 6400

Note! - based on clean pipes. The friction coefficient may vary with the pipe material.

Related Topics

  • Water Systems - Hot and cold water service systems - design properties, capacities, sizing and more

Related Documents

Tag Search

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  • es: bombeo de tuberías de aguas residuales Bombas de capacidad
  • de: Kanalisationsrohrförderpumpen Kapazität

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