When extinguishing fires in oil depots involving gasoline, diesel, and aviation kerosene, should low-expansion foam be used for firefighting?

Is it in the form of a storage tank? According to GB50074, the following requirements apply: 1) Above-ground fixed-roof oil tanks and internal floating-roof oil tanks shall be equipped with a low-expansion foam fire extinguishing system or a medium-expansion foam fire extinguishing system. 2) Low-expansion foam fire extinguishing systems are suitable for floating roof oil tanks; medium-expansion foam fire extinguishing systems can also be used when a central hose system is employed to deliver the foam mixture. 3) High-expansion foam fire suppression systems can be installed in covered oil tanks. Generally, a low or medium multiple is chosen!

In accordance with clause 12.1 of the **Standard GB 50074-2002 \"Code for Design of Oil Depots\" of the People’s Republic of China, low-expansion foam fire extinguishing systems should be given priority. Fire protection facilities 12.1 General provisions 12.1.1 Oil depots shall be equipped with fire protection facilities. The installation of fire protection facilities in oil depots should be determined through comprehensive consideration of factors such as the depot’s classification, the type of oil tanks, the fire hazard associated with the oils stored, and the conditions for fire cooperation with nearby facilities. 12.1.2 Foam fire extinguishing facilities shall be installed in the oil tanks of oil depots ； In level 4 and 5 oil depots located in areas with water and electricity shortages or in remote locations, where it is difficult to install foam fire extinguishing systems, smoke fire extinguishing systems can also be used. 12.1.3 The installation of foam fire extinguishing systems shall comply with the following provisions: 1 Above-ground fixed-roof oil tanks and internal floating-roof oil tanks shall be equipped with low-expansion foam fire extinguishing systems or medium-expansion foam fire extinguishing systems. 2 Floating roof oil tanks should be equipped with a low-expansion foam fire extinguishing system ； When a central hose is used to deliver the foam mixture, a medium-expansion foam fire extinguishing system can also be installed. 3 Earth-covered oil tanks can be equipped with a high-expansion foam fire extinguishing system. 12.1.4 The installation method of the foam fire extinguishing system facilities for oil tanks shall comply with the following provisions: 1 Oil tanks with a single-tank capacity greater than 1000 m3 shall be equipped with fixed foam fire extinguishing systems. 2 Oil tanks with a single-tank capacity of 1000 m3 or less can use a semi-fixed foam fire extinguishing system. 3 Horizontal oil tanks, buried oil tanks, Class B lubricant tanks, and above-ground oil tanks with a capacity of not more than 200 m3 can be equipped with mobile foam fire extinguishing systems. 4 When an enterprise has a strong mobile fire-fighting force, the oil tanks in its affiliated oil depots can be equipped with semi-fixed or mobile foam fire-suppression systems. 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. 12.1.6 The fire protection facilities at the oil loading and unloading terminals belonging to the oil depot shall comply with the following provisions: 1 When the oil loading and unloading terminals associated with the oil depot are of 5000t class or above, the fire protection facilities may be designed in accordance with the relevant provisions on fire protection for oil loading and unloading terminals outlined in the current standard **“Code for Fire Protection Design of Petrochemical Enterprises” GB 50160. 2 When the oil loading and unloading terminal belonging to the oil depot is of a capacity of less than 5,000 tons, one mobile spray fire pump with a flow rate of 30 L/s and one wheeled pressure proportioning foam generator with a capacity of 500 L should be installed. 3 At the oil loading and unloading terminals belonging to grade IV and V oil depots, 2 spray nozzles with a flow rate of 7.5 L/s and 1 portable pressure-proportional foam generator with a capacity of 200 L should be installed. This post was last edited by lyhh9024 on 2009-2-3 11:11]

It depends on the type of oil tanks in the oil depot; for the three types of oil depots designed by our institute – surface depots, covered depots, and underground depots – different fire protection systems are employed.