In sewage piping and pumping systems the fluid flow rate must be kept within certain limits to avoid operating problems
In a sewage piping and pumping system the flow velocity must exceed certain limits to maintain trouble free operation and 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.
The flow velocity waste water systems must not exceed certain limits to reduce the potential for wear and tear due to the effects of erosion and abrasion:
- The speed in high-grit sewage handling systems should not exceed 12 ft/sec.
- The flow and velocity in sewage systems with low grit concentrations should not exceed 18 ft/sec.
The flow rate capacity in US gal for a sewage piping and pumping systems with this limitations are expressed below for different pipe sizes:
|Flow Rate (US GPM)|
|Pipe Dimension |
|Minimum Velocity||Maximum Velocity|
|2 ft/sec |
|3 ft/sec |
|12 ft/sec |
|18 ft/sec |