Inspecting Tank Vehicles

Introduction

These lessons have information needed to pass the CDL knowledge test for driving a tank vehicle. A tank endorsement is required for certain vehicles that transport liquids or gases. The liquid or gas does not have to be a hazardous material.

A tank endorsement is required if your vehicle needs a Class A or B CDL and you want to haul a liquid or liquid gas in a tank or tanks having an individual rated capacity of more than 119 gallons and an aggregate rated capacity of 1000 gallons or more that is either permanently or temporarily attached to the vehicle or the chassis. A tank endorsement is also required for Class C vehicles when the vehicle is used to transport hazardous materials in liquid or gas form in the above described rated tanks. A commercial motor vehicle transporting an empty storage container tank, not designed for transportation, with a rated capacity of 1,000 gallons or more that is temporarily attached to a flatbed trailer is not considered a tank vehicle. Before loading, unloading, or driving a tanker, you must inspect the vehicle. This makes sure that the vehicle is safe to carry the liquid or gas and is safe to drive.

Inspecting Tank Vehicles

Tank vehicles have special items that you need to check. Tank vehicles come in many types and sizes. You need to check the vehicle's operator manual to make sure you know how to inspect your tank vehicle.

Leaks

On all tank vehicles, the most important item to check for is leaks. Check under and around the vehicle for signs of any leaking. Don’t carry liquids or gases in a leaking tank. To do so is a crime. You will be cited and prevented from driving further. You may also be liable for the clean-up of any spill.

In general, check the following:

• Check the tank’s body or shell for dents or leaks.
• Check the intake, discharge, and cut-off valves. Make sure the valves are in the correct position before loading, unloading, or moving the vehicle.
• Check pipes, connections, and hoses for leaks, especially around joints.
• Check manhole covers and vents. Make sure the covers have gaskets and they close correctly. Keep the vents clear so they work correctly.

Check Special Purpose Equipment

If your vehicle has any of the following equipment, make sure it works:

• Vapor recovery kits.
• Grounding and bonding cables.
• Emergency shut-off systems.
• Built in fire extinguisher.

Never drive a tank vehicle with open valves or manhole covers.

Special Equipment

Check the emergency equipment required for your vehicle. Find out what equipment you’re required to carry and make sure you have it (and it works).