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An isolation layer is necessary, especially for lubricant storage tanks located underground or semi-underground. Installing such an isolation layer (such as a leak-proof layer, a double-tank structure, or a leak-proof tank) is a crucial measure to prevent leaks from contaminating the soil and groundwater. In accordance with environmental regulations, underground oil tanks in locations such as gas stations must be upgraded to double-wall tanks or equipped with leak containment ponds, along with leak detection systems, to effectively prevent pollution risks. A double-layer oil storage tank consists of an inner tank and an outer tank, with a gap between them that allows monitoring equipment to be installed in order to detect leaks promptly. Furthermore, in the design of the tank area, a hierarchical protection system should also be established through fire dikes and separation dikes. Diaphragms are used to divide tank compartments into multiple sections, thereby controlling the scope of impact from minor leaks; their effective volume should be no less than 10% of the capacity of the largest tank within that diaphragm area. For bottled lubricants stored indoors or outdoors, although no isolation layer at the level of a \"storage tank\" is required, it is necessary to keep new oil and used oil separate ； Lay waterproof trays on the ground ； Avoid direct contact with soil or water sources.