There are several possible reasons for excessive beer foaming, or fobbing. One potential cause could be improper handling or storage of the beer, such as shaking the can or bottle before opening it. This can create an excess of carbon dioxide in the beer, leading to increased foaming when poured.
Fobbing can also be caused by various factors including:
Incorrect Cellar Temperature: Beer served too warm or too cold can lead to excessive foaming due to CO₂ release dynamics.
Dirty Beer Lines: Unclean lines can introduce contaminants that affect beer quality and cause foaming issues.
Incorrect Line Pressure: High or low pressure settings can impact CO₂ levels in the beer and result in foam production.
Brew Quality: Factors such as carbonation level, protein content, and yeast activity in the beer can influence foam formation.
Improperly Rinsed Glassware: Residual soap or other contaminants in glassware can cause foaming when beer is poured.