how to drain pressure tank

3 min read 06-02-2025

Meta Description: Learn how to safely drain a pressure tank for maintenance or repairs. This comprehensive guide provides step-by-step instructions, safety precautions, and troubleshooting tips for various tank types. Ensure you handle this task correctly to avoid accidents and damage.

Pressure tanks, vital components in many water systems, require occasional draining for maintenance or repairs. Draining a pressure tank might seem daunting, but with the right steps and safety precautions, it's a manageable task. This guide details how to safely and effectively drain your pressure tank, regardless of its type.

Understanding Your Pressure Tank

Before you begin, it's crucial to identify the type of pressure tank you have. Common types include:

Diaphragm tanks: These use a flexible diaphragm to separate air and water. They are the most common type found in homes.
** bladder tanks:** Similar to diaphragm tanks, but utilize a bladder instead of a diaphragm.
Standard tanks: These are less common in residential settings and often found in larger commercial applications. They require more complex draining procedures.

Knowing your tank type will help determine the best draining method. Check the tank's label or manufacturer's documentation if you are unsure.

Tools and Materials You'll Need

Gather these items before starting the draining process:

Bucket: A large bucket to collect the drained water.
Wrench: Appropriate size to fit the drain valve.
Hoses: Garden hoses can be useful for directing the water away from your house or to a drain.
Gloves: Protective gloves to prevent skin irritation.
Safety glasses: To protect your eyes from splashes.
** Towels:** For cleanup.
Optional: Air compressor: For some tanks, pressurizing the tank after draining can help with reassembly.

Step-by-Step Guide to Draining a Pressure Tank (Diaphragm/Bladder Type)

This guide focuses on the most common type: diaphragm tanks. The procedure for bladder tanks is very similar.

1. Turn Off the Water Supply: Locate the shut-off valve for the water supply leading to the pressure tank. Turn it completely off.

2. Relieve System Pressure: Open a nearby faucet to release any remaining pressure in the system. You should hear a hissing sound as the air pressure is released.

3. Locate the Drain Valve: Most diaphragm tanks have a drain valve located at the bottom of the tank. It might be a simple valve or a petcock.

4. Attach a Hose (Optional): For easier drainage, attach a garden hose to the drain valve. Direct the other end of the hose to a suitable drainage area.

5. Open the Drain Valve: Carefully open the drain valve, allowing the water to drain into the bucket or hose.

6. Monitor the Drainage: Watch the water flow. The process may take some time, depending on the tank's size.

7. Close the Drain Valve: Once the water flow stops, close the drain valve tightly.

8. Inspect the Tank: Once the tank is empty, inspect it for any signs of damage, corrosion, or leaks.

9. (Optional) Re-pressurize: For some tanks, it's recommended to re-pressurize the tank after draining to maintain the diaphragm's integrity. Consult your tank's instructions.

Safety Precautions

Always turn off the water supply before draining the tank. Failure to do so can result in serious water damage.
Wear protective gloves and safety glasses to avoid injury from splashes or sharp objects.
Work in a well-ventilated area.
Be cautious when handling the drain valve. Avoid forcing it if it's difficult to open.
If you are unsure about any step, consult a qualified plumber.

Troubleshooting

The drain valve is stuck: Try using a wrench to loosen it. If it's severely corroded, you may need to replace it.
The tank isn't draining completely: There might be sediment buildup in the tank. Consult a plumber for cleaning or replacement.
Water continues to leak after draining: There may be a leak in the tank itself, requiring repair or replacement.

When to Drain Your Pressure Tank

Regular maintenance is key for a long-lasting pressure tank. Consider draining your tank:

Annually: For preventative maintenance.
After repairs: To remove any debris or contaminants.
If you notice unusual noises or leaks: These could indicate a problem that requires attention.

Draining your pressure tank is a crucial part of maintaining your water system. Following these steps and safety precautions ensures the process is smooth, safe, and effective. Remember, if you are ever unsure, contacting a qualified plumber is always recommended.