Originally Posted by pickles
I use my CIP system on sankes, cornies, and carboys. I'm not sure what's happening in any of them except the carboy. In the carboy the water very clearly shoots against the bottom and deflects in a pattern that leaves "triangles" untouched. I use a very powerful Iwaki pump for my CIP system (1/3hp or 1/2hp , can't remember off hand). I have gotten into a habit of giving the vessel a 1/4 turn every so often to ensure full coverage. I'd like to see a cross section of a sanke CIP system in action. Perhaps they've designed each piece to work as a system to ensure a completely cleaned interior.
I'm guessing that the shape of the bottom is crucial. The keg bottom is dished while the carboy bottom has a bit of a hump.