Balancing – Part 2
Great! Now we have our beer in the keg and it is carbonated to the correct pressure from part 1. Unfortunately we still have a problem due to the pressure we need to maintainer carbonation. It is solved by line balancing. If we were to pour a beer in the short line setups typical for keggerators, the beer would pour much to fast. And with fast pouring, we get, you guessed it foaming!
The solution is not to turn down the gas pressure. This would lead to degassing of the beer, and yet more foaming. Therefore what we need is to introduce greater resistance in the beer line, to reduce the flow rate to an exceptable level. Think of it like a simple electrical circuit. If we have a 12 volt battery and we need to reduce the voltage to 2 volts then we need a resistor in the circuit that will give us a 10 volt drop.
Here we already have a solution in place.
It is the line from the keg to the tap, we need to choose the internal diameter and length of line that will give us the pressure drop required increasing the length and or reducing the internal diameter of our beer line will do the trick every time in most setups. In Conclusion for a typical keggerator this could be 4-5 meters of 4mm ID beer line.
So the end result should be that you have,
- a keg at equilibrium pressure for the temperature and style of beer
- and sufficient line length for resistance to enable smooth pouring without excessive foaming