« on: October 31, 2013, 03:04:36 PM »
The diameter of liquid line depends on how far you are moving the beer from the keg (both length and height) and at what pressure you're keeping the beer at. For most beers serving at 36-40 F at a keg pressure of 12-14 psi about 6-8 ft of 3/16" beer line works. If you're running from a basement to, say, an upstairs tap then you may need 1/4" line to get the right serving pressure to kill the foaming. If you're serving higher-pressure belgians or wheats then you're going to need longer lines to balance out the inc keg psi.
The idea of using 5/16" gas line is more to allow for proper gas volume going into the keg for consistent flow on the restricted "out" side of the keg. If you are using the same diameter gas line going into the keg than the liquid line out (or smaller diameter in than out) it MAY create a kind of vacuum effect int he keg that can intermittently reduce out-line pressure and create foaming when you dispense.