Crude oil topping units fill a need for crude oil producers that have domestic requirements for diesel, fuel oil, kerosene, AGO, LPG or asphalt but donât have total refining capacity. Essentially they are atmospheric distillation units that produce hydrocarbon boiling point cuts from resid to LPG. topping unit is an inexpensive, technically simple means to enhance the value of crude oil near the source of production. Crude oil distillation is an energy intensive process that requires crude oil heaters with cross heat exchangers.
In the U.S., the legal definition of an Antique is any item over 100 years old. The term Vintage is used to describe something that is second generation or older. So the toys your parents played with, or the clothes they wore when they were your age would be considered Vintage but not Antiques.
I think it rather depends on the item. Furniture and small appliances tend to be considered vintage anywhere from 25 to 50 years old and beyond. the term vintage however is highly subjective. Vintage clothing particular couture styles might be less than ten years old. Cars, airplanes and boats generally start edging into the vintage category anywhere from 25 to 50 years of age. In most states a car can be registered with vintage collector plates after it is 25 years old or older.