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I encountered a question while working on 4.2.3: Both 4.2.3.2 and 4.2.3.3 specify fire separation distances; does this mean that the distance has to meet the requirements of both 4.2.3.2 and 4.2.3.3? It is sufficient to meet requirement 4.2.3.2; there is a question regarding... 4.2.2: The fire separation distance between storage tanks for categories A, B, and C liquids should not be less than the values specified in Table 4.2.2. Table 4.2.2 Fire separation distances between storage tanks for Class A, B, and C liquids (m)
Category | Tank type | Fixed-roof tank | Floating-roof tank | Horizontal tank | Above-ground tank | Semi-underground tank | Underground tank
Class A and B liquids | Single-tank capacity | V (m³) | V ≤ 10,000 | 0.75D | 0.5D | 0.4D | 0.4D | Not less than 0.8 m | V > 10,000 | 0.6D
Class C liquids | Regardless of capacity | 0.4D | Unrestricted | Unrestricted | —
Note: 1 D is the diameter of the adjacent larger vertical storage tank (m) ； The diameter of a rectangular tank is half the sum of its long side and short side ； 2 The fire separation distance between different liquids and storage tanks of different types shall not be less than the larger value specified in this table ； 3 The fire separation distance between two rows of horizontal storage tanks should not be less than 3.0 m ； 4 The fire separation distance between the liquid storage tanks equipped with nitrogen protection systems can be determined based on the distance required for floating roof storage tanks ； 5 When the capacity of a single tank is less than or equal to 1000 m3 and a fixed-cooling fire protection system is used, the fire separation distance between above-ground fixed-roof tanks holding Class A and Class B liquids shall not be less than 0.6D ； 6 When underwater foam extinguishing equipment, fixed cooling water systems, and foam extinguishing equipment for fighting liquid fires within fire dikes are also available, the fire separation distance between storage tanks can be reduced appropriately; however, for above-ground storage tanks, this distance should not be less than 0.4D ； 7 For liquids with a flash point greater than 120°C, when the capacity of the storage tank is greater than 1000 m3, the fire separation distance between such tanks should be no less than 5.0 m ； When the tank capacity is less than or equal to 1000 m3, the fire separation distance between tanks should not be less than 2.0 m. 4.2.3 When storage tanks for categories A, B, and C are arranged in groups, the following requirements shall be met: The storage capacity of each individual tank within a group, as well as the total storage capacity of the group, shall not exceed the values specified in Table 4.2.3 ； The arrangement of internal storage tanks in 2 groups should not exceed two rows. The fire separation distance between vertical storage tanks for Class A and Class B liquids should not be less than 2.0 m, while the fire separation distance between horizontal storage tanks should not be less than 0.8 m ； There is no limit on the fire separation distance between Class C liquid storage tanks ； 3 The fire separation distance between tank groups shall be calculated based on the type of tanks within the group and their total capacity, by converting them to standard single tanks of the same category, and shall be determined in accordance with Article 4.2.2 of these specifications. Table 4.2.3 Limits for the grouped arrangement of storage tanks for Class A, B, and C liquids Name Maximum capacity per tank (m3) Maximum capacity per group of tanks (m3) Class A and B liquids: 200, 1000 Class C liquids: 500, 3000