Low Carbonation After Filling: Where Is the CO2 Being Lost?

Confirm the beverage entering the filler first. If inlet carbonation is correct, investigate product warming, pressure loss, long venting or snift, foaming, excessive headspace and closure delay.

Stop automatic operation, isolate electrical and pneumatic energy, close and depressurize product circuits, and follow the machine lockout/tagout procedure before opening guards or removing a valve. Quarantine product made since the last confirmed good check.

Locate the fault

• Mixer sample meets target but packaged beverage is low
• CO2 loss increases during long production runs
• Bottles with more foam show the lowest carbonation
• Results differ between filler valves or before and after a stop

Inspection sequence

1. Use the same calibrated method to test product at mixer outlet, filler inlet and finished package
2. Log temperature and pressure at each sample point
3. Compare loss by valve number and stop-start condition
4. Review equalization, filling and decompression timing without changing it
5. Measure headspace and fill level alongside CO2
6. Check time from fill completion to secure closure and verify cap torque

Corrective work

• Correct heat gain in piping and restore cooling performance
• Repair pressure regulation or gas leakage at the filler
• Return snift and decompression settings to the validated profile
• Correct fill level, cap application and fill-to-cap transfer timing

Operating records and follow-up

• Create a CO2 mass-balance check from mixer to package
• Calibrate temperature, pressure and carbonation instruments together
• Trend bowl-pressure stability
• Include snift valves in maintenance
• Audit fill-to-cap delay after line-speed changes

Equipment details: PET Bottle CSD Beverage Filling Machine.