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Pump Performance Curve (PDF)Sewer System Design
Proper low pressure sewer system design requires minimizing retention time and friction losses while maintaining adequate scouring velocities. E/One's semi-positive displacement pump lends itself to complex system designs because of its nearly vertical pump curve and the resulting predictable flow. A semi-positive displacement pump provides predictable flows and tolerance of widely varying system pressures.Total Dynamic Head (TDH) Capability
Although a low pressure sewer system has a specific design pressure, it has a tendency to fluctuate. These unpredictable increases and decreases are attributed to the randomness of the number of pumps running on a single sewer system at any given time. A grinder pump must be able to adapt to varying pressures while still providing efficient service.E/One's semi-positive displacement pump is designed and tested to function properly at 138 feet of total dynamic head (TDH). At this design head, it produces a flow rate of 9 gpm. If the system pressure exceeds 138 feet TDH during actual operation, the pump will continue to function normally, but at a slightly reduced flow rate.