Sometimes, you pump a keg, but only when necessary and in a specific way. The primary method for dispensing beer from a keg relies on external pressure (usually CO2) to push the beer out. However, if that external pressure is insufficient, or if you're using a manual pump system, pumping becomes relevant.
When and How to Pump a Keg
Here's a breakdown of when and how to properly pump a keg:
- When to Pump: You should only pump a keg when the beer flow slows down significantly or stops altogether while the faucet is open. This indicates a loss of pressure.
- How to Pump:
- Open the faucet: Always have the faucet open before you start pumping.
- Pump Gently: Pump the handle 4-5 times in short bursts.
- Observe the Flow: Watch the beer flow. Once it returns to a normal rate, stop pumping.
- Repeat if Necessary: If the flow slows down again, repeat the pumping process.
Why Pumping Incorrectly is Bad
- Foamy Beer: Pumping the keg before opening the faucet can create excessive pressure. This results in foamy beer that's difficult to pour and enjoy.
- Altered Carbonation: Over-pumping can force too much air into the keg, altering the beer's carbonation level and potentially leading to a flat taste over time.
- Contamination: If using a manual air pump, you introduce outside air into the keg. This can affect the beer's flavor and increase the risk of spoilage, as it oxidizes the beer faster. CO2 systems are preferred because they maintain proper carbonation and prevent oxidation.
Alternative to Pumping: CO2 Systems
The best way to dispense beer from a keg is using a CO2 system. CO2 maintains the correct pressure inside the keg, ensuring a consistent flow of properly carbonated beer without the risks associated with pumping. These systems regulate the pressure, pushing the beer out smoothly.
