What Is a Duplex Pump System?
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Quick answer
A duplex pump system has two pumps in the same chamber that take turns running and back each other up. If one fails, the other keeps the station working, which is why commercial lift stations often use them.
Commercial properties cannot afford a station that stops, so many are built with two pumps instead of one. That arrangement is called a duplex system.
How does a duplex system work?
Both pumps sit in the wet well. The control panel alternates which pump runs first, so wear is shared. If water keeps rising, the second pump can join in. If one pump fails, the other carries the load.
Does a duplex system mean I do not need maintenance?
No. A duplex system gives you a backup, but only while someone knows the first pump has failed. A working alarm and regular service are what turn a backup into protection.
What is the difference from a single-pump station?
A single-pump station has no backup. If the pump fails, the chamber fills and wastewater backs up. If your lift station has only one pump, ask about the risk and about planned service.
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Quick questions and answers
- How do I tell if my station is duplex?
Look in the control panel for two sets of breakers or controls, or ask whoever installed or services it. We can check on a visit.
- Do both pumps run at the same time?
Usually they alternate, and run together only when the flow is high. The settings depend on the panel and the station design.
- Do you repair duplex lift stations?
Yes. Call 832-789-5357 and see our lift station pump repair page.
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