Here are five faults that could cause a centrifugal bilge pump to malfunction, assuming the air ejector (if present) and air line are functioning properly:
- Blocked Impeller:
- Reason: Debris or foreign objects can become lodged within the impeller, preventing it from spinning freely and reducing the pump’s ability to move water.
- Worn Out Impeller:
- Reason: Over time, the impeller vanes can wear or become damaged, reducing their efficiency in pushing water. This can lead to a decrease in the pump’s flow rate.
- Leaking Valve or Piping:
- Reason: Leaks on the suction or discharge side of the pump can significantly reduce its pumping capacity. Air entering the system through leaks can also hinder the pump’s ability to move water efficiently.
- Faulty Electrical Supply:
- Reason: Insufficient voltage or amperage reaching the motor can cause it to run slowly or not at all, preventing the pump from operating effectively.
- Seized Pump Shaft:
- Reason: Corrosion, wear, or foreign objects can cause the pump shaft to seize or become stiff, preventing the impeller from rotating. This will completely halt the pump’s operation.
In addition to these faults, a malfunctioning pressure switch or float switch could also prevent the pump from automatically turning on when the bilge water level rises. However, since the scenario specifies the pump not operating satisfactorily, these control components are less likely to be the root cause.