Tanker trucks are engineered with safety as the highest priority. These vehicles transport essential but potentially hazardous liquids such as gasoline, diesel, industrial chemicals, and other volatile substances. While their reinforced tanks and advanced braking systems are easy to notice, there is one small feature that many people overlook: the metal chain hanging from the rear of the truck.
This dangling chain, often dismissed as an outdated accessory, actually plays a critical role in ensuring safe transport. It is known as a grounding chain or static discharge chain, and its purpose is to prevent the dangerous buildup of static electricity while the truck is in motion.
As a tanker moves down the road, friction naturally occurs — friction between the tires and the pavement, between the air and the truck’s body, and even inside the tank itself as the liquid cargo sloshes and shifts. All of this friction generates static charges. If these charges accumulate without a way to escape, they can produce sparks. And when sparks occur near flammable vapors or highly combustible liquids, the results can be catastrophic.
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