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The main storage methods of crude oil and oil products are bulk storage and bulk storage. Bulk storage refers to storage in the form of standard barrels, and bulk storage refers to storage in the form of oil tanks. Oil tanks can be divided into metal tanks and non-metal tanks, and metal tanks can be divided into vertical cylinders and horizontal cylinders. According to the different construction methods of oil depots, bulk crude oil or oil products can also be divided into aboveground, semi-underground and underground, water-sealed cavern and underwater storage.