As an expert sommelier and brewer, I can provide you with detailed information on how long beer lasts in a kegerator once it has been tapped. The lifespan of beer in a kegerator can vary depending on various factors such as the type of beer, whether it is pasteurized or non-pasteurized, and the method of dispensing.
When it comes to non-pasteurized draft beer, it generally has a shorter lifespan compared to pasteurized beer. This is because non-pasteurized beer contains live yeast and other microorganisms that contribute to its flavor and aroma but also make it more susceptible to spoilage. When stored in a kegerator and dispensed with CO2 while maintaining the proper temperature and pressure, non-pasteurized draft beer can typically last for about 45-60 days.
On the other hand, pasteurized draft beer undergoes a heat treatment process that kills off most of the microorganisms, extending its shelf life. When stored and dispensed correctly, pasteurized draft beer can last for about 90-120 days in a kegerator.
It is important to note that these timeframes are general guidelines and can vary depending on the specific beer and the conditions it is stored in. Factors such as the quality of the kegerator, the cleanliness of the beer lines, and the temperature stability can all impact the lifespan of the beer.
It is also worth mentioning that if you are using a party pump, which relies on air to dispense the beer, the lifespan of the beer will be significantly shorter. When using a party pump, the beer will start to lose its freshness and quality within 8-12 hours. This is because the exposure to air introduces oxygen, which can lead to oxidation and off-flavors in the beer.
To ensure that your beer lasts as long as possible in a kegerator, it is crucial to maintain proper temperature and pressure. Ideally, the kegerator should be set to the recommended serving temperature for the specific beer, typically between 38-45 degrees Fahrenheit (3-7 degrees Celsius). Additionally, the pressure should be adjusted to the appropriate level to prevent over-carbonation or under-carbonation.
Regular cleaning and maintenance of the kegerator and beer lines are also essential to prevent any build-up of bacteria or yeast that can negatively impact the beer's quality and lifespan.
When stored and dispensed correctly in a kegerator, non-pasteurized draft beer can last for about 45-60 days, while pasteurized draft beer can last for about 90-120 days. However, when using a party pump, the freshness of the beer will start to decline within 8-12 hours. Remember to maintain proper temperature, pressure, and cleanliness to ensure the longevity and quality of your keg beer.