Waste Water and Flow Capacity
In sewage piping and pumping systems the fluid flow rate must be kept within certain limits to avoid operating problems
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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 (inches) |
||||
| Minimum Velocity | Maximum 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 |
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