Final answer:
A filter is required in the oil line to separate dirt and sediment from fuel-oil. Filtration is part of the oil refinement process that includes separation, conversion, and treatment stages to ensure oil purity and quality for various applications.
Step-by-step explanation:
To separate dirt and sediment from fuel-oil, which comes in various grades, a filter is required in the oil line. Filtration ensures that the oil is clean and free from solid contaminants before it reaches the engine or storage tanks. It is a crucial step in the refinement process. The filter is part of a broader system that includes processes such as separation, conversion, and treatment in the refining of crude oil. The filtration process involves passing the oil through porous media such as artificial membranes, nets, or high technological filter systems, to remove unwanted solids based on the cleanliness requirement and filtering speed needed.
In the context of an oil refinery, filtration along with other treatment processes are used to remove impurities such as sulfur and nitrogen from the produced oil fractions. Oil refineries utilize large-scale fractional distillation to first separate crude oil into simpler mixtures, which are then subjected to further refinement including filtration to meet quality standards for their various uses such as in diesel fuel, kerosene, and gasoline.