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 - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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