sanke kegs are designed to be CIP with the spear. I think if you invert the keg and spray the center of the bottom the cleaning solution will be evenly distributed on all areas of the keg interior.
BTW I also ferment in sanke kegs
Hmmm, this makes a lot of sense. I wonder how powerful the jet of liquid is coming out of the keg washer? I rigged up a DIY sprayer with a 360 degree sprinkler head from HD. It works pretty well.
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.
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