Causes of chain dragging of tanker in gas station

Because the oil in the fuel tank will shake back and forth when the car is driving, it will rub against the metal wall of the fuel tank, thus generating static electricity. When static electricity reaches a certain level, sparks will be generated, causing oil tanks to catch fire and explode. Therefore, the oil tank wall is connected with the ground by a chain, with the purpose of introducing static electricity into the ground, just like the ground wire of a three-hole plug.