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Engineering ToolBox > 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

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:

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