Best Practices for Purging a Bright Tank Using the Pressurize and Release Method

The pressurize and release method is an effective way to purge oxygen from an empty bright tank, ensuring beer quality and stability. This technique leverages CO₂ pressure cycles to expel oxygen and create an oxygen-free environment before transferring beer. Implementing best practices will maximize efficiency and minimize CO₂ waste.

Start Slowly

Introducing CO₂ at a low flow rate (0.5-1 bar or 7-14 psi) allows for controlled displacement of oxygen without generating excessive turbulence. A steady, gradual purge prevents unnecessary gas loss while ensuring a complete oxygen removal process.

Vent Arm Setup

• Connect the BrewOps Purge and BrewOps Modified Tee to the CIP or vent arm, ensuring there is a valve between the arm and the tee.
• Close the valve while pressurizing the tank to prevent immediate gas escape.
• The modified tee helps regulate back pressure, optimizing purge effectiveness and sensor accuracy.
• Optional: Install a pressure relief valve (PRV) above the valve to prevent accidental over-pressurization.

If the BrewOps Modified Tee is unavailable:

• Use a standard tee.
• Attach the BrewOps sensor to the side port and a butterfly valve to the bottom.
• Keep the top port valve-free to avoid accidental closure.
• Open the butterfly valve about ¼ of the way to maintain a back pressure of 4-5 psi.

Pressurize and Release Cycles

1. Gradually pressurize the tank with CO₂ to about 2-3 psi.
2. Once the tank reaches the target pressure, release CO₂ via the relief or bleed valve, allowing oxygen to be expelled.
3. Repeat this cycle 2-3 times to ensure thorough oxygen removal.
4. Carefully monitor the process to avoid over-pressurization, which can cause equipment damage or safety hazards.

Monitor Purge Level

Using the BrewOps Purge ensures that oxygen levels are effectively reduced. The purge process should show:

1. A gradual decline in oxygen concentration.
2. A sharp drop as CO₂ fully displaces oxygen.
3. A stable, low oxygen level indicating the purge is complete.

Final Checks

• Remove the gas line, BrewOps Purge, and the modified tee.
• Ensure all valves are closed and clamps are tightened to prevent leaks.
• Maintain a slight positive pressure (~5 psi) in the tank to keep oxygen out.

By following these best practices, brewers can achieve an effective purge using the pressurize and release method, reducing oxygen levels and ensuring beer quality without excessive CO₂ consumption.