Is it necessary to install a fixed fire cooling water system for benzene tanks?

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This post was last edited by Zuo You Bu Fen on 2016-12-29 at 16:14. The tank in question has a capacity of 3,000 cubic meters, with dimensions of Φ17000×15850; it operates at atmospheric pressure, features an internal floating roof, nitrogen sealing, and electric heating. The storage temperature should be above 15°C. Benzene has a melting point of 5.5°C, a flash point of -10.1°C, and is classified as extremely toxic (Grade I); its explosive range is 1.2–8.0 V%. According to GB 50160-2008, the Fire Protection Design Code for Petrochemical Enterprises, section 8.4.5, fixed fire cooling systems must be installed in storage tanks whose wall height exceeds 17 meters, those with a capacity of 10,000 cubic meters or more, and low-pressure tanks with a capacity of 2,000 cubic meters or more. Per GB 50016-2014, the Fire Protection Design Code for Buildings, section 8.1.4, mobile water guns or fixed water cooling facilities must be provided in storage tanks (areas) used for storing liquids of Classes A, B, and C. For above-ground storage tanks for classes A, B, and C with a height greater than 15 m or a single-tank capacity greater than 2000 m3, fixed water cooling systems are recommended. GB 50074-2002 Code for Design of Oil Depots 12.1.5 Oil tanks shall be equipped with a fire cooling water system. The installation of the fire cooling water system shall comply with the following provisions. 1 Oil tanks with a single-tank capacity of not less than 5000 m3 or a tank wall height of not less than 17 m shall be equipped with a fixed fire cooling water system. 2 For oil tanks with a single-tank capacity of less than 5000 m3 or a tank wall height of less than 17 m, a mobile fire cooling water system or a fire cooling water system that combines fixed nozzles with mobile nozzles can be installed. Explanation of the provisions: Fire cooling water plays a particularly important role in extinguishing fires in storage tanks. Whether water supply is sufficient and timely determines the success or failure of fire fighting, as has been proven by numerous fire incidents. Therefore, ensuring an adequate water supply is key to the success of fire fighting. 1 For storage tanks with a single-tank capacity of 5000 m3 or more that use a mobile cooling water system, a large number of water guns and personnel are required. For the cooling of storage tanks with a wall height of 17 m or more, mobile water guns must be capable of generating a sufficient water jet for extinguishing fires; however, these guns exert considerable recoil force, making it difficult for operators to control them. Therefore, a fixed cooling water system should be used. 2 For storage tanks with a capacity of less than 5000 m3 and a tank wall height of less than 17 m, as well as other types of storage tanks, a relatively small number of mobile cooling nozzles are required, and fewer personnel are needed; operating these nozzles is also simpler. Compared to using a fixed cooling water system, adopting a mobile cooling water system can save on project investment. GB 50074-2014 Code for Design of Oil Depots 12.1.5 Storage tanks shall be equipped with a fire cooling water system. The installation of fire cooling water systems shall comply with the following provisions: 1. For above-ground vertical storage tanks with a capacity of 3000 m3 or more, or a tank wall height of 15 m or more, a fixed fire cooling water system shall be installed. 2 For above-ground vertical storage tanks with a capacity of less than 3000 m3 and a tank wall height of less than 15 m, as well as other storage tanks, a mobile fire cooling water system can be installed. Explanation of the provisions: Fire cooling water plays a particularly important role in extinguishing fires in storage tanks. Whether water supply is sufficient and timely determines the success or failure of fire fighting, as has been proven by numerous fire incidents. Therefore, ensuring an adequate water supply is key to the success of fire fighting. 1 For storage tanks with a single-tank capacity of 3000 m3 or more that use a mobile cooling water system, a large number of water guns and personnel are required. For the cooling of storage tanks with a wall height of 15 m or more, mobile water guns must be capable of generating a sufficient water jet for extinguishing fires; however, these guns exert considerable recoil force, making it difficult for operators to control them. Therefore, a fixed cooling water system should be used. 2 For storage tanks with a capacity of less than 3000 m3 and a tank wall height of less than 15 m, as well as other types of storage tanks, a relatively small number of mobile cooling nozzles are required, fewer workers are needed, and operating these nozzles is simpler. Compared to using a fixed cooling water system, adopting a mobile cooling water system can save on project investment.