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.
Best Answer: Higher karat alloys are more resistant to corrosion, are heavier, and are more expensive because of their higher gold content. This has always been true. Gold items under 14K cannot be legally called jewelry in certain jurisdictions. Rose gold is a gold/copper alloy that is more commonly found in antique jewelry, although there is no reason it could not be made today. For something to be considered vintage, it must be 20 years old or older. I think this is actually quite generous. It doesn't seem things from 1988 would be considered vintage! Yet that is the general guideline. As to whether vintage is usually 10 karat gold; no, not at all.