The secrets of the mysterious tanker truck chain

 

Discover the crucial role of the discreet element that accompanies tanker trucks, ensuring safety during the transport of flammable substances.

Static electricity: a little-known danger

When a tanker truck is moving, the contact between  the dry air inside the tank and the metal walls  produces static electricity. This phenomenon, common in everyday life (like when you take off a wool sweater), can become extremely dangerous in this specific context. 

What dangers does this entail?

• Accumulation of electrical charges:  Static electricity concentrates on the metallic surface of the tank.
• Discharge and sparks:  In the absence of a discharge of these charges, sparks may occur when they are suddenly released.

  Imagine a spark near highly flammable substances such as gasoline:  the risk of fire or explosion is considerable.

  
  

The chain: an essential element for grounding

To neutralize these electrical charges, tanker trucks are equipped with a  suspended metal chain  that drags on the ground.

 

How does it work?

1. Charge conduction:  The chain, made of a conductive material, captures the electrical charges accumulated on the truck.
2. Grounding:  By coming into contact with the ground, it transfers these charges to the earth, thus discharging them.

3. This mechanism acts like a  "reverse lightning rod" , dissipating static charges before they become a threat.

   A crucial safety device

   The chain at the rear is just one of the many safety devices integrated into tanker trucks. Other measures include:

    

   • RTR grounding systems:  A cable connects the truck to a fixed point during filling or emptying operations to prevent static electricity.
   • Anti-electrostatic materials:  Some components and tanks are made from materials that limit the generation of electrical charges.

   These combined measures ensure  optimal protection for drivers, goods and the environment.

   In conclusion: the chain, an invisible protection

   The presence of the chain at the rear of tanker trucks is of paramount importance. It plays a vital role in safety by dissipating static electricity before it can become a hazard.  A small device offering significant protection, indispensable for preventing incidents.