What is the ideal pressure for a direct draw draft system?

The ideal pressure for a direct draw draft system is generally around 14.5 psig, which is based on the need to maintain proper carbonation levels in the beer and to ensure a balanced flow rate without excessive foaming. This pressure allows for optimal beer delivery from the keg to the tap while minimizing issues such as over-carbonation or under-carbonation.

This pressure is calculated to match the CO2 levels that are typically found in most beers, which helps maintain the beer's intended flavor profile and mouthfeel. A pressure of 14.5 psig corresponds closely to the carbon dioxide equilibrium pressure for beer at room temperature, facilitating a smooth pour that retains the beer's carbonation and carbonation balance.

When the pressure is either too low or too high, it can lead to undesirable outcomes, such as flat beer if the pressure is insufficient or excessive foaming if the pressure is too high. Therefore, calibrating the draft system to approximately 14.5 psig ensures that the system operates effectively for the majority of beers served on draft.