Yes I worked 4 years at a Prairie Farms Dairy that made ice cream just for Steak N' Shake to make their shakes with. NH3 was the refrigerant that was used to cool the tanks and hardening room. Every Sunday I had to drain the oil from the bottom of the tanks and the 3 cylinders of the Ice Cream Freezer. It was the most dangerous job there but it had to be done or the milk would not cool or ice cream get hard. Once the ice cream was made and packaged into 5 gallon containers, 80 contaioners were stacked 4 high on a pallet and put in the hardening room where it was a negative 25°F (25°F below zero). More than once a pallet of containers were spilled onto the floor and it didn't take long to freeze to the floor. It was a job to clean that up.
But yes oil will collect in the bottom of the cooling tanks and keep it from cooling.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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