Air can enter a pump through several pathways, primarily due to leaks or inadequate fluid levels. Here's a breakdown:
Common Entry Points for Air
-
Leaks in the Suction Line:
- Air can be drawn into the pump through leaks, especially in the suction line. These leaks can occur at:
- Elbows
- Joints
- Other connection points
- The reference states: "Air can easily enter pumps through leaks in the suction line at elbows, joints, etc. It's safe to say, if fluid is coming out, air is definitely getting in." This highlights that any compromised seal on the suction side is a potential entry point for air.
- Air can be drawn into the pump through leaks, especially in the suction line. These leaks can occur at:
-
Insufficient Submergence:
- Submersible, immersible, or pumps in suction lift applications need adequate fluid levels to operate correctly.
- If the minimum submergence level in the tank or pit isn't met, air can be drawn into the pump along with the fluid.
- The reference notes that pumps in suction lift applications are prone to air entrainment if the minimum submergence level is not met.
Practical Implications and Solutions
| Issue | Cause | Possible Solution |
|---|---|---|
| Air Leaks in Suction Line | Loose connections, worn seals, corroded pipes | Regularly inspect and tighten connections, replace worn seals, repair or replace corroded pipes |
| Insufficient Submergence Level | Low fluid levels, incorrect pump placement | Maintain adequate fluid levels, reposition the pump to ensure sufficient submergence |
In summary, air typically enters a pump through leaks on the suction side or when the pump isn't properly submerged in the fluid it's intended to pump.
