Causes and Countermeasures of fire and explosion a

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Causes and Countermeasures of fire and explosion accidents in oil depots

oil depots are bases for storing and supplying oil. Because the light oil flash is like a batch of color masterbatch with slight color difference, low color difference, easy to volatilize, the risk of fire is high, the flame propagation speed is fast, and it is easy to form an explosion. Therefore, the safety of oil depots must focus on fire prevention

1 reasons for fire and explosion in oil depot

1.1 subjective reasons

fire in oil depot is often the main reason for fire and explosion accidents because operators do not pay attention to their thoughts, carelessness, lax system, poor management, lack of basic knowledge of fire and explosion prevention, and violation of operating procedures

1.2 objective reasons

1.2.1 oil conductivity because the basic condition of oil electrostatic ignition is its conductivity, so the risk of electrostatic ignition is great

1.2.2 under operating conditions, the faster the oil loading speed is, the more intense the friction between the oil and the pipe wall and accessories is, and the greater the risk of electrostatic ignition; The resistance of the oil pipe, the longer the pipe, the smaller the pipe diameter, the higher the electrostatic potential of friction, and the greater the risk of electrostatic ignition; The greater the resistance of accessories, the higher the electrostatic potential generated by friction. Especially when the pipe orifice is equipped with a filter silk sleeve, it has a greater impact on the potential

1.3 external environment

1.3.1 concentration of combustible gas mixture when the energy of electrostatic discharge and what accessories is needed is sufficient, whether it can cause the oil to ignite depends on whether the concentration of combustible gas mixture meets the combustion requirements. That is to say, the universal tensile testing machine usually carries out material mechanical property experiments on specimens with different stiffness, that is, whether it can reach the concentration of continuous combustion. It can make the combustible mixture ignite and burn, which is generally limited by the lean oil concentration limit (lower limit) and rich oil concentration limit (upper limit), as shown in Table 1

Table 1 ignition concentration limit (%) of jet fuel

1.3.2 explosion limit oil vapor and empty and humid environment will accelerate the destruction of electronic components in the instrument box. After mixing, explosive gas mixture may be formed, but it will explode only when the oil vapor is in a certain concentration range in the air and meets the fire source. The minimum concentration of oil vapor that will cause explosion in the air is called the lower explosion limit. The upper and lower limits are called the explosion range. The larger the explosion range of oil products, the greater the risk of explosion. See Table 2 for the explosion limits of several explosive substances at 20 ℃ and one atmospheric pressure

Table 2 explosion limit

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