Never Realized This: Why Tanker Trucks Have That Extra Chain Hanging at the Back

Why Static Was a Bigger Problem in the Past

Older trucks had:

• Less effective electrical grounding systems
• Non-conductive tires
• Less advanced safety standards during loading and unloading

In those conditions, static buildup posed a greater risk, especially when transferring fuel. Chains provided a simple, low-tech way to help reduce that danger.

The Modern Reality: Do Chains Still Matter?

Here’s where things get interesting. On modern tanker trucks, the chain is often not the primary safety measure anymore.

Today’s trucks are designed with:

• Conductive or semi-conductive tires
• Built-in grounding and bonding systems
• Strict safety procedures during fuel loading and unloading

Because of this, many experts agree that a dragging chain alone is not very effective at grounding a moving vehicle at highway speeds. In fact, the road surface (asphalt) isn’t always a good electrical conductor anyway.

So Why Are the Chains Still There?

There are a few reasons you still see them:

1. Legacy Design
   Some trucks keep the chain simply because it’s always been there. Fleet designs don’t always change quickly, especially if something isn’t causing problems.
2. Extra Layer of Safety
   Even if the effect is minimal, some operators view the chain as a backup—one more small precaution in an industry where safety is critical.

3. ADVERTISEMENT

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