Petrochemical tank transport vehicles often run under open atmosphere in the wild, which is easy to be hit by lightning strike. Meanwhile,
in transportation the shaking and vibration of vehicle may cause accumulation of static electricity. In specific area of vehicle , the
positive and negative charges may lose their balance and cause high electrostatic potential, even up to thousands of volts. When potential
difference is caused with surrounding objects, the electric charge transfer may occur, and spark discharge may happen which will cause
fire or even explosion on flammable substances.
Traditional protective measures for hazardous tank vehicles are: to increase tank wall thickness, to have the inner wall with antistatic
coating, to use conductive rubber tires, to use electrostatic drag belt etc. Usually the basic ways to prevent electrostatic hazards are: to
have electrostatic earthing, to improve operational measures, to use electrostatic eliminator (installed at the pipe outlet)and to add
antistatic agents and so on. But few researches are made for lightning protection and electrostatic protection for moving vehicles.
Tank vehicles usually use drag chain or conductive rubber drag belt for earthing, but the connection with ground is not reliable, especially
when the vehicle is moving on bumpy road. In this case fire or explosion of vehicle is inevitable when lightning or electrostatic event
Therefore an integrated protective measure and multi-channel discharge for earthing are effective methods against lightning and static electricity.