Determine the recommended ejector pit size based on your system’s flow rate, pump capacity, and desired pump cycle time. Proper sizing ensures efficient operation and longevity of your wastewater system.
About Ejector Pit Sizing
An ejector pit is an essential component in wastewater removal systems, especially in buildings where plumbing fixtures are located below the main sewer or septic line. The pit collects wastewater, which is then pumped out to the main sewer line using an ejector pump.
Proper sizing of the ejector pit is crucial to ensure efficient operation. A pit that is too small may cause the pump to cycle too frequently, leading to premature wear and increased energy costs. Conversely, a pit that is too large may cause wastewater to remain stagnant for extended periods, potentially leading to odor issues and the buildup of solids.
This calculator helps you determine the optimal pit volume based on key parameters:
- Flow Rate: The rate at which wastewater enters the pit, measured in gallons per minute (GPM).
- Pump Capacity: The pumping rate of your ejector pump, also in GPM.
- Desired Pump Cycle Time: The ideal duration between pump activations, in minutes.
The recommended pit volume is calculated using the formula:
Pit Volume (gallons) = (Flow Rate × Cycle Time) / 4
Where the division by 4 accounts for typical system considerations and safety factors. The result provides a balance between efficient pump operation and system longevity.
Always consult with a professional engineer or plumber to ensure compliance with local codes and regulations before implementing any changes to your wastewater system.
