I have questions regarding fire dikes
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This post was last edited by lyhh9024 on 2009-12-13 at 17:34. As for the basic setup, in the workshop, 3 storage tanks with a capacity of 20 cubic meters each will be placed as needed (containing toluene, DMF, and methanol respectively), along with 2 storage tanks with a capacity of 30 cubic meters each (all containing methanol); all of these are horizontal storage tanks. Now, it’s necessary to consider the fire separation distances. Here are my personal opinions: 1. Since they are all horizontal storage tanks, according to Table 6.2.8 of standard 50160-2008, I recommend a fire separation distance of 0.8 meters between the tanks. 2. The tanks contain Class B liquids, so a fire dike should be installed. According to Article 6.2.13 of 50160-2008, the distance from the base of a horizontal storage tank to the inner edge of the fire dike should be no less than 3 meters. 3. What should be the fire separation distance between the fire dike and the outer wall of the workshop? I couldn’t find any relevant regulatory provisions for this. Based on the points mentioned above, I would appreciate it if everyone could check whether they are reasonable, as well as point out any aspects that have not been taken into account. Thank you
In fact, such small storage tanks do not need to be regulated in accordance with petrochemical standards; the Building Code is sufficient. The distance between vertical storage tanks and horizontal storage tanks shall be no less than 2 m, in accordance with Article 4.2.3 of the Building Code. The distance between the workshop and the fire dike only needs to meet the requirements regarding the distance between the workshop and the total storage capacity of the tank area, as well as the requirements within the tank area itself.
It probably also depends on the level of the workshop; for Class A workshops, it seems to start at at least 12M
The safety distance between the tank area and the workshop should be no less than 15 meters.
Noting that there is misleading information upstairs, the following clarification is provided: \"Code for Fire Protection Design of Buildings\": 4.2 Fire separation distances for storage tanks (areas) for liquids of categories A, B, and C. 4.2.1 The fire separation distances between storage tanks (areas) for liquids of categories A, B, and C, as well as between bulk storage areas for liquids of categories B and C and buildings, shall not be less than those specified in Table 4.2.1. Table 4.2.1 Fire separation distances (in meters) between liquid storage tanks (areas) of categories A, B, and C, as well as between barrel storage areas for liquids of categories B and C and buildings. Item: Fire resistance rating of the building; Outdoor substations and distribution stations: Grade I, Grade II, Grade III, Grade IV. Liquids of categories A and B: Total storage capacity V (in m3) of one tank area or storage site – 1 ≤ V < 50, 50 ≤ V < 200, 200 ≤ V < 1000, 1000 ≤ V < 5000; Corresponding fire separation distances: 12.0, 15.0, 20.0, 25.0. Liquids of category C: 5 ≤ V < 250, 250 ≤ V < 1000, 1000 ≤ V < 5000, 5000 ≤ V < 25000; Corresponding fire separation distances: 12.0, 15.0, 20.0, 25.0, 15.0, 20.0, 25.0, 30.0, 20.0, 25.0, 30.0, 40.0, 24.0, 28.0, 32.0, 40.0. Note: 1 When storage tanks for liquids of categories A and B and those of category C are located in the same tank area, their total storage capacity can be converted such that 1 m3 of liquids of categories A and B is equivalent to 5 m3 of liquids of category C ； 2 The fire protection distance shall be measured from the outer wall of the storage tank or the outer edge of the stack that is closest to the building; however, the distance from the base line outside the fire dike of the storage tank to the building shall not be less than 10.0 m ； For fixed-roof storage areas for liquids of categories A, B, and C, semi-outdoor storage areas, and barrel storage areas for liquids of categories B and C, the fire separation distances from category A factories (warehouses) and civil buildings shall be increased by 25% in accordance with the provisions of this table. Moreover, the fire separation distances between storage areas for liquids of categories A and B, semi-outdoor storage areas, barrel storage areas for liquids of categories B and C, and category A factories (warehouses) or civil buildings shall not be less than 25.0 m. The fire separation distances from locations with open flames or sparks shall be increased by 25% in line with the regulations applicable to buildings with a fire resistance rating of level 4 as specified in this table ； 4 The fire separation distance between the floating roof tank area or liquid tank areas with a flash point greater than 120°C and buildings may be reduced by 25% in accordance with the provisions of this table ； 5 When several tank areas are located within the same storage complex, the fire separation distance between these tank areas shall not be less than the larger of the values specified in this table for the fire separation distance between a tank area with a certain storage capacity and a building with a fire resistance rating of level 4 ； 6 For horizontal tanks storing Class A, B, and C liquids that are buried directly underground, when the volume of a single tank is less than or equal to 50 m3 and the total volume is less than or equal to 200 m3, the fire separation distance from buildings can be reduced by 50% in accordance with the provisions of this table ； 7 Outdoor substations refer to those in power systems with a voltage of 35–500 kV and where each transformer has a capacity of over 10 MVA, as well as outdoor step-down substations in industrial enterprises whose total oil volume in the transformers is greater than 5 tons.
If the poster wishes to design in accordance with the Petrochemical Code, the distance should be determined in line with Article 4.2.12; the distance from Class A workshops should also be 25 meters. Theoretically, the distance between the fire dike and the workshop should be at least 10 meters, but to meet the requirements for fire access routes and safety distances, it is generally at least 20 meters as well.
I’m not sure what stage of design you are at, but before preparing the construction drawings, it would be advisable to refer to a safety assessment report. For fire dikes, fire simulation calculations are carried out, and the distances calculated in such analyses can be quite large; therefore, rest rooms and offices should not be located on the side of the workshop that is close to the fire dike.
It is difficult to understand the note stating that the distance from the foundation line outside the tank fire dike to the building should not be less than 10.0 m. Regardless, the total reserve is 10m?
In accordance with the requirements of Article 4.2 of the Code for Fire Protection Design of Buildings, it is determined by calculating based on the total volume and referring to the data in the table
This post was last edited by lizhongyuan on 2009-12-18 09:48. Based on what the original poster mentioned, it seems that the owner does not want to find another location to set up a separate tank area; they simply want to place these tanks right next to the workshop. Based on the current implementation by relevant enterprises and the review results by fire and safety supervision departments, this approach is feasible. The poster can treat the relevant storage tanks as intermediate tanks for the workshop process equipment. This helps to save space in the tank area, and companies can also reduce their investment costs. However, relevant safety measures such as alarm monitoring systems and other automated safety control systems must be in place. These are personal opinions for reference only; no legal responsibility is assumed for these statements.
Thank you for the answer from the 10th floor; that’s exactly what the owner meant. These tanks are currently being handled in accordance with the definition of process equipment (per clause 2.0.14 of the terms in GB50160-2008), by placing them at the back of the workshop and installing enclosures around them. Thank you also to the person above, and above that. . . Ladies and gentlemen