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 - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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