Industry FAQ

Q: What is the difference between a vortex impeller and a non-clog impeller, and when should each be used?

A: Vortex impellers feature a recessed design that creates a swirling action to pull solids into the pump, minimizing clogging. They're ideal for applications with high solids content but lower head requirements. Non-clog impellers have a more open design and are capable of handling larger solids, often grinding them to reduce size, making them suitable for higher head applications and systems prone to rag accumulation.

Q: How do I determine the appropriate pump horsepower for my application?

A: Pump horsepower selection is based on calculating the total dynamic head (TDH) – the vertical lift plus friction losses – and the required flow rate. You'll need to use a pump curve from the manufacturer to identify a pump that can deliver the desired flow at the calculated TDH. Over-sizing the pump can lead to inefficiencies and increased energy consumption, while under-sizing will result in inadequate performance.

Q: What are the key considerations when selecting a pump casing material?

A: Casing material selection depends on the corrosiveness of the wastewater. Cast iron is cost-effective for relatively benign environments but requires protective coatings. Stainless steel (316) is essential for highly corrosive applications. HDPE is a good option for applications with minimal abrasion but lower structural demands. Consider the long-term cost of ownership, including maintenance and replacement frequency.

Q: How can I prevent pump cavitation?

A: Cavitation occurs when the pressure inside the pump drops below the vapor pressure of the liquid. To prevent it, ensure adequate submergence of the pump, minimize suction lift, and avoid sharp bends or restrictions in the suction piping. Proper pump sizing is also critical; an undersized pump can lead to cavitation.

Q: What are the best practices for extending the life of my sewer pump's mechanical seal?

A: Mechanical seal life can be extended by ensuring the pump is operating within its design parameters, preventing dry running, and minimizing the presence of abrasive solids. Regular inspection of the seal for wear or damage is essential. Proper lubrication, if applicable, should be maintained according to manufacturer recommendations. Avoid sudden starts and stops, which can create excessive pressure surges.