To prevent airlock in your sump pump, the key is to ensure air can escape from the pump and the discharge pipe. This is primarily achieved through the use of weep holes.
Understanding Airlock
An airlock occurs when a bubble of air gets trapped inside the sump pump or the discharge pipe. This air bubble creates a pressure imbalance, preventing the pump from effectively pushing water out, even though the pump motor is running. Think of it as the pump being "air-bound."
The Role of Weep Holes
Weep holes play a crucial role in preventing airlock. According to our reference, these holes allow trapped air to escape, preventing the formation of the problematic air bubble.
How Weep Holes Work
Weep holes are small holes drilled into the discharge pipe, typically just above the pump itself. They function in two primary ways:
- Releasing Trapped Air: As the sump pump operates, any air that gets into the system can escape through the weep hole, preventing the formation of a large air bubble.
- Breaking Vacuum: When the pump shuts off, the weep hole allows water in the discharge pipe to drain back into the sump pit. This prevents a vacuum from forming, which could hinder the pump's ability to start on the next cycle.
Placement of Weep Holes
- Location: The weep hole should be located above the highest point of the sump pump in the basin and below the check valve (if you have one installed).
- Size: The size of the weep hole is important. It should be large enough to allow air to escape but not so large that it significantly reduces the pump's efficiency. A 1/4" hole is generally sufficient.
Other Considerations
While weep holes are the primary solution, consider these additional factors to minimize the risk of airlock:
- Check Valve Functionality: Ensure your check valve is functioning correctly. A faulty check valve can allow water to drain back into the sump pit, potentially introducing air into the system.
- Pipe Slope: Ensure the discharge pipe has a slight downward slope away from the pump to prevent water from pooling and trapping air.
Summary
| Prevention Method | Description |
|---|---|
| Weep Holes | Small holes drilled in the discharge pipe to allow air to escape. |
| Check Valve | Ensure it is functioning correctly to prevent backflow. |
| Pipe Slope | Maintain a slight downward slope in the discharge pipe to prevent air trapping. |
By understanding the mechanics of airlock and implementing the solutions outlined above, you can effectively prevent this common sump pump issue.
