Expansion tank not functioning? unravel the causes and restore its efficiency

If your expansion tank is not working correctly, it can lead to a host of problems for your plumbing system. In this blog post, we will explore the most common reasons why an expansion tank might not be working and provide solutions to fix it.

Understanding the Function of an Expansion Tank

An expansion tank is an essential component of a closed-loop plumbing system. Its primary purpose is to absorb the thermal expansion of water as it heats up. As water is heated, it expands in volume. If there is no expansion tank to accommodate this expansion, the pressure in the system can rise to dangerous levels, potentially causing leaks or even pipe bursts.

Common Reasons Why an Expansion Tank is Not Working

1. Incorrect System Pressure

The ideal system pressure for a closed-loop plumbing system is between 12 and 15 psi. If the pressure is too low, the expansion tank may not be able to absorb the expansion of water, leading to pressure spikes. Conversely, if the pressure is too high, the expansion tank may be overfilled and unable to expand.

Solution: Adjust the system pressure to the recommended range using a pressure gauge and adjustment valve.

2. Faulty Pressure Relief Valve

The pressure relief valve is a safety device that releases excess pressure from the system if it exceeds a certain threshold. A faulty pressure relief valve can prevent the expansion tank from working correctly by not allowing excess pressure to escape.

Solution: Inspect the pressure relief valve for any signs of damage or corrosion. If faulty, replace it with a new one.

3. Air in the Expansion Tank

Air can accumulate inside the expansion tank over time, reducing its capacity to absorb water expansion. When the tank is full of air, it cannot perform its function effectively.

Solution: Drain the expansion tank and refill it with water. Use a bleed valve to release any trapped air.

4. Leaking Expansion Tank

A leaking expansion tank can result in a loss of water, reducing its ability to absorb expansion. Leaks can occur at the tank’s seams, connections, or diaphragm.

Solution: Inspect the expansion tank for any leaks. If a leak is found, replace the tank or repair it using a sealant.

5. Undersized Expansion Tank

If the expansion tank is too small for the size of the plumbing system, it may not be able to accommodate the volume of water expansion. This can lead to excessive pressure buildup and system failure.

Solution: Calculate the required expansion tank size using the formula provided by the manufacturer. If the current tank is undersized, replace it with a larger one.

6. Worn or Damaged Diaphragm

The diaphragm inside the expansion tank separates the water from the air or gas charge. A worn or damaged diaphragm can allow water and air to mix, reducing the tank’s effectiveness.

Solution: Replace the diaphragm if it is damaged or worn.

7. Improper Installation

Improper installation can also lead to an expansion tank not working correctly. The tank must be installed in the correct orientation and at the appropriate location in the plumbing system.

Solution: Ensure that the expansion tank is installed according to the manufacturer’s instructions. Contact a licensed plumber if necessary.

In a nutshell: Troubleshooting Your Expansion Tank

If you are experiencing issues with your expansion tank, it is important to identify the underlying cause and implement the appropriate solution. By following the steps outlined in this guide, you can restore your expansion tank to optimal functionality and prevent plumbing system problems.

Frequently Asked Questions (FAQ)

Q: How can I tell if my expansion tank is working?

A: A properly functioning expansion tank should have a slight bulge when the system is pressurized. If the tank is flat or deflated, it may not be working correctly.

Q: How often should I check my expansion tank?

A: It is recommended to inspect your expansion tank annually for any signs of damage or leaks.

Q: Can I replace an expansion tank myself?

A: While it is possible to replace an expansion tank yourself, it is generally recommended to hire a licensed plumber to ensure proper installation and system compatibility.