Discussion on fire separation distances [Daily Question 090330]
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There is a hazardous chemicals manufacturing facility that uses Class A solvents. These solvents are stored in underground horizontal tanks measuring 15m x 6m. The fire separation distance between these underground tanks and the workshop is 27m, while the fire separation distance between them and the surrounding wall is 6m. Outside this wall, there is an 8m-wide passage, and beyond that lies a semi-abandoned three-story residential building; thus, the fire separation distance between the underground tanks and this residential building is less than 25m. Does the above layout comply with relevant specifications? Why? Last edited by Striving for victory in solitude on 2009-3-30 11:30]
1. If there is a road outside the enclosure, the fire separation distance between the storage tank and that road is insufficient (Code for Building Design, Article 4.2.9). 2. According to the note in Article 4.2.1, Clause 6 of the building codes, the fire separation distance between horizontally installed Class A, B, and C tanks buried directly underground (where volume requirements also apply) and buildings can be reduced by half; thus, the required fire separation distance in such cases is 12.5 meters. In this particular case, the distance is 8 + 6 = 14 meters, which should meet the requirements.
There is a hazardous chemicals manufacturing facility that uses Class A solvents. These solvents are stored in underground horizontal tanks measuring 15m x 6m. The fire separation distance between these underground tanks and the workshop is 27m, while the fire separation distance between them and the surrounding wall is 6m. Outside this wall, there is an 8m-wide passage, and beyond that lies a semi-abandoned three-story residential building; thus, the fire separation distance between the underground tanks and this residential building is less than 25m. Please point out the problems mentioned above? 1. According to Note 3 of Article 4.2.1, the fire separation distances between fixed-roof storage tanks for liquids of Classes A, B, and C, semi-outdoor storage areas, and barrel storage areas for liquids of Classes B and C, and buildings of Class A (warehouses) or civil buildings shall be increased by 25% as specified in this table. Moreover, the fire separation distances between storage tanks for liquids of Classes A and B, semi-outdoor storage areas, barrel storage areas for liquids of Classes B and C, and buildings of Class A (warehouses) or civil buildings shall not be less than 25.0 m; therefore, the distance between these storage tanks and civil buildings does not meet the required standards. 2. In accordance with GB50351-2005 “Code for Design of Fire Dikes in Tank Storage Areas”, the distance from horizontal oil tanks to the base line of the inner side of the fire dike (protective wall) shall not be less than 3 meters. Additionally, according to GB50016—2006 “Code for Fire Protection Design of Buildings”, Article 3.4.12 states that the distance between the factory perimeter wall and the buildings within the factory shall not be less than 5.0 m, and the buildings on either side of the wall must also meet the corresponding fire separation requirements. Therefore, a fire separation distance of 6m between the buried horizontal tank and the enclosure does not meet the requirements. At the same time, no fire dike was installed. 3. In accordance with Article 4.2.9 of GB50016—2006 \"Code for Fire Protection Design of Buildings\", the fire separation distance between storage tanks for Class A, B, and C liquids and railways or roads shall not be less than the values specified in Table 4.2.9 (the distance between Class A and B storage tanks and roads outside the factory shall be no less than 20 meters). Therefore, the distance between this storage tank and the roads outside the plant does not meet the requirements. 4. The fire separation distance between the horizontal tank and the workshop is 27 meters; since it is not possible to determine the fire risk level of the workshop, it is impossible to determine whether there is any problem. This post was last edited by lyhh9024 on 2009-3-30 14:00]
1. The distance between the storage tank and the workshop meets the requirements of the Building Code. Code for Building Design 4.2.1 2: The distance between the storage tank and the roads outside the facility does not meet the requirements of the Code for Building Design. Code for Building Design 4.2.9, item 3: The distance between storage tanks and residential buildings does not meet the requirements of the Code for Building Design. According to Article 4.2.1 of the Building Code, the parameters for storage tanks provided by the moderator are rather vague; therefore, it is likely that Article 6 of this same article cannot be applied. For horizontal tanks storing Class A, B, or C liquids that are buried directly in the ground, when the volume of a single tank is less than or equal to 50 m3 and the total volume of all such tanks is less than or equal to 200 m3, the fire separation distance required from buildings can be reduced by 50% as specified in this table. The regulations.
Article 6 of 4.2.1 of the Building Code: 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 may be reduced by 50% in accordance with the provisions of this table. The question is: Can the fire separation distance between buried storage tanks and civil buildings also be reduced by half? This is not specified in the regulations!
Class A solvents are stored in buried horizontal tanks (15m3 X 6). The fire separation distance between these buried horizontal tanks and the workshop is 27 meters. According to regulation 4.2.1, for horizontal tanks holding Class A, B, or C liquids that are buried directly underground, when the volume of a single tank is less than or equal to 50m3 and the total volume of all such tanks is less than or equal to 200m3, the fire separation distance from buildings can be reduced by 50% as specified in this table； That is, for Class A and Class B liquids, the total storage volume V (in m3) in one tank area or storage site shall be 50 ≤ V < 200, with a maximum length of 25 meters. The distance is sufficient. The fire separation distance between the buried horizontal tank and the enclosure wall is 6 m; outside the enclosure wall there is an 8-m-wide passage, followed by a semi-abandoned 3-story residential building. According to 4.2.9, the fire separation distance between storage tanks for classes A, B, and C and railways or roads should not be less than the values specified in Table 4.2.9. That is, 20 meters from the road outside the field ； Therefore, 6 meters is not enough either. The distance from residential houses is even less sufficient