How to remove an airlock in a water pump

This guide aims to help you effectively understand how to remove an airlock in a pump by identifying its root causes and explaining practical methods to eliminate it. By following these guidelines, you will be able to restore your pumping system to its highest possible performance and avoid common mistakes.

What Causes an Airlock in a Pump?

An airlock occurs when air bubbles get trapped inside the pump or pipes, obstructing the flow of liquid. This is similar to a kink in a hose, where trapped air prevents water from flowing naturally. As a result, the pumping rate may significantly decrease or stop entirely, as pumps cannot move air as efficiently as liquids due to air's lower density.

Why Do Airlocks Occur in Pumps?

Several reasons lead to airlocks within pumping systems, and it is important to know them to avoid operational problems. Below are the most prominent causes and their effects:

1. Insufficient Pump Pressure

When the pump cannot generate enough force to overcome the resistance of the piping network, air bubbles may form, hindering the flow of liquid. This often occurs in systems with long or complex pipes, where water needs to pass through long distances or numerous bends and valves.

2. Leak in the Suction Pipe

Even the smallest openings in the suction pipe can allow air to enter the system, leading to the formation of air bubbles that hinder the pump's operation. This leak weakens the negative pressure required for the pumping process, as air mixes with water to form a less dense liquid that the pump struggles to move. This results in reduced efficiency and potential damage to components due to cavitation.

3. Low Water Level in the Tank

When the water level in the tank drops to a point where the pump's suction opening is exposed to air, the pump's self-priming system is affected. This problem is common in systems experiencing varying demand or insufficient water supply. Additionally, low water levels can create air vortices that allow air to enter the pump with the water, exacerbating the problem.

4. Loose Threaded Connection

Small gaps caused by a loose threaded connection allow air to leak into the system, leading to the formation of bubbles that reduce water flow efficiency. Over time, this can lead to a complete airlock. Therefore, it is advisable to regularly check these connections and tighten them securely to avoid the problem.

How to Remove an Airlock in a Water Pump

Now that you are familiar with the common causes of airlocks, here are the most effective ways to remove an airlock in a water pump and restore its normal performance:

1. Replace the Hose

If you notice persistent air bubbles, reduced water flow, or damage to the hose, it's time to replace it. Replacement steps:

• Turn off the pump and ensure pressure is relieved.

• Carefully remove old hoses to avoid damaging connections.

• Install new hoses of the appropriate diameter and length.

• Fill the pump with water before starting to expel any trapped air.

• Restart the pump and ensure normal flow resumes.

2. Ensure Correct Suction Hose Installation

Improper installation can lead to air leakage into the system. Therefore, ensure the suction hose is fully submerged in water and check all connections for tightness and no leaks. After confirming this, run the pump to expel any remaining air.

3. Check and Adjust Threaded Connection Position

Misalignment or loosening of the threaded connection can cause air leakage. Inspect the connection carefully, readjust its position if necessary, then tighten it securely to prevent any leaks.

4. Lower the Pump Installation Height

When the pump is installed at a significant height compared to the water source, it may struggle to generate sufficient suction pressure, leading to the formation of air pockets. Reducing the vertical distance between the pump and the water level helps improve the suction process and reduces the chances of airlocks.

5. Slow Filling of the System

Filling the system with water slowly helps air escape gradually. Partially open the fill valve and let the water flow slowly, listening for the sound of bubbles as they exit. Continue this until the pump and all pipes are completely filled with water.

6. Cleaning the Valve

Over time, sediment can accumulate inside the valve, hindering its operation and causing air to become trapped. To clear the blockage, turn off the pump, carefully dismantle the valve, clean it thoroughly with a brush and water, then reassemble it and run the pump to check its performance.

Conclusion

An airlock within a water pump can be an annoying problem, but it is usually easily resolved if the correct steps are followed. Understanding the potential causes and knowing how to remove trapped air will help you maintain system efficiency and prevent future malfunctions. If the problem persists, it is advisable to contact a specialized technician or an authorized service center for the necessary assistance.