Oil Tank and Refinery are two essential components in the oil industry, but they serve very different purposes:

• Oil Tank An oil tank is a storage facility used to hold crude oil or refined petroleum products. It can be located at production sites, ports, or distribution terminals. Oil tanks are not involved in processing; their function is purely for storage and logistics—either before refining or after, for distribution.
• Refinery A refinery is an industrial facility where crude oil is processed and transformed into various usable products such as gasoline, diesel, jet fuel, and petrochemicals. It involves complex chemical and mechanical processes like distillation, cracking, and reforming.

In summary:

• Oil Tank = Storage only
• Refinery = Processing and conversion of crude oil into usable products