Regarding the fire dike in the tank farm

There are regulations regarding fire prevention in chemical enterprises.

Of course, there are distance requirements as stipulated in the \"Code for Design of Oil Depots\": 5.0.9 The design of roads within oil depots shall comply with the following provisions: 1 An circular fire road shall be provided in the tank area of the oil depot. Oil tank farms at grade IV and V oil depots, as well as those in mountainous or hilly areas, may also be equipped with end-type fire roads at the end of the turnaround area. 2 The distance between the center of the oil tank and the nearest fire road shall not exceed 80 m ； A fire fighting passage with a width of not less than 7m should be provided between the outer footlines of the fire dikes of adjacent tank groups. 3 The distance between the fire road and the base line of the outer embankment of the fire dike should not be less than 3 m.

1. In the table, D represents the diameter of the larger oil tank among adjacent oil tanks. For a rectangular oil tank, D is half the sum of the length and width. 2. For oil tanks storing different types of oils, the fire separation distance between oil tanks of different types should be the larger value. 3. The spacing between elevated tanks should not be less than 0.6 m. The fire dike should be constructed from non-combustible materials, and its actual height should be 0.2m higher than the calculated height. For vertical oil tanks, the actual height of the fire dike should not be less than 1m nor more than 1.6m. The actual height of the fire dike around horizontal oil tanks should not be less than 0.5 m. If a soil-based fire dike is used, its top width should not be less than 0.5 m. Additionally, for the purpose of firefighting, the distance from a vertical oil tank to the foot of the inner slope of the fire dike should not be less than half the height of the tank. The distance from a horizontal oil tank to the foot of the inner slope of the fire dike should not be less than 3 m. When the total capacity of the oil tank cluster is greater than 20,000 m³ and the number of oil tanks is more than two, a partition dike should be installed in the fire dike, with its top being 0.2–0.3 m lower than the top of the fire dike. The distance between the fire road in the oil tank area and the foot of the fire dike should be no less than 3 m, and the road should be 6 m wide with two lanes.