Preventive measures for electrostatic fire accidents during filling, storage and transportation of flammable liquids

a) Control the flow rate: reducing the friction speed or flow rate and other working parameters can limit the generation of static electricity. Generally, when the resistivity cannot exceed 107Q.cm, the flow rate does not exceed 10 m/s; when the resistivity is 107~1 OllQ.cm, the flow rate does not exceed 5 m/s; when the resistivity is greater than 1 OllQ.cm, The flow rate is lower. When starting to fill the empty tank, first control the flow rate lm/s. When the inlet pipe is immersed 200mm, the flow rate can be increased. When it is 0.6m higher than the pipeline outlet, the specified speed will be reached.

b) The use of floating roof tanks can prevent the accumulation of static electricity. The floating roof oil tank has a floating boat on the oil surface, which rises and falls with the height of the liquid level. There are 2 soft copper wires with a diameter of 5.64mm or more on the floating roof, which are connected to the tank wall. The flammable liquid carries a static charge. Lead it to the floating boat and follow the wire to avoid the accumulation of static charge.

c) Avoid spraying and splashing of flammable liquids in the air, and use low-in and low-out methods for the feed of the storage tank.

d) The loading and unloading equipment, storage tanks, and pipelines should be well grounded.

e) Avoid using static non-conductor pipelines to transport flammable liquids. The metal components in the storage tank must be equipotentially connected with the tank body and grounded.

f) Specify the standing time. After the transportation of flammable and explosive liquid is stopped, it must be allowed to stand for a certain period of time according to the regulations before performing operations such as ruler measurement, temperature measurement, and sample sampling.