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SECTION 8: Tank Vehicles

This Section Covers:

  • Inspecting Tank Vehicles
  • Driving Tank Vehicles
  • Safe Driving Rules

This section has information needed to pass the CDL knowledge test for driving a tank vehicle. (You should also study Sections 2, 5, 6 and 9.) A Tank Vehicle 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 Vehicle endorsement is required if your vehicle needs a Class A or B CDL and you want to haul a liquid or liquid gaseous material in individual permanently mounted cargo tank(s) rated in excess of 119 gallons with an accumulating total rated at 1000 gallons or more or an attached portable tank rated in excess of 1,000 gallons.

This endorsement does not apply to a truck transporting empty tanks to locations strictly for the purpose of resale. A Tank Vehicle endorsement is also required for Class C vehicles when the vehicle is used to transport hazardous materials in liquid or liquid gas form in the above described rated tanks.

Before loading, unloading or driving a tanker, inspect the vehicle. This ensures that the vehicle is safe to carry the liquid or gas and is safe to drive.

Any tank vehicle that has been transporting hazardous materials must be purged of hazardous materials 48 hours prior to testing with documentation verifying the purge.

8.1 – Inspecting Tank Vehicles

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

8.1.1 – 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. Do not 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:

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

8.1.2 – 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.

8.1.3 – Special Equipment

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

Multiple-Choice Questions:

Question #360 (1 of 7)

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When can you drive a tanker with open valves or manhole covers?

  • If the materials are not hazardous
  • If the weather permits
  • Never
  • If the tank is empty
Never drive a tank vehicle with open valves or manhole covers.
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Question #357 (2 of 7)

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What should you do if you're pulling a tanker and you find a small leak?

  • If the materials are not dangerous, you can safely drive with it
  • You can drive with a small leak for up to 150 miles or three hours, whichever comes sooner
  • If the materials are not dangerous, drive to the nearest shop for repairs but no further
  • Never carry liquids or gases in a leaking tank
Do not 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.
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Question #356 (3 of 7)

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On all tank vehicles, the most important item to check for is:

  • Dirt around the outlet
  • Clogged vents
  • Leaks
  • Rust around the lip of the rim
On all tank vehicles, the most important item to check for is leaks.
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Question #354 (4 of 7)

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A Tank Vehicle endorsement is required if your vehicle needs a Class A or B CDL and you want to haul a liquid or liquid gaseous material in individual permanently mounted cargo tank(s) rated in excess of:

  • 1000 gallons with an accumulating total rated at 1000 gallons or more or an attached portable tank rated in excess of 119 gallons.
  • 119 gallons with an accumulating total rated at 1000 gallons or more or an attached portable tank rated in excess of 1,000 gallons.
  • 119 gallons with an accumulating total rated at 1000 gallons or more or an attached portable tank rated in excess of 119 gallons.
  • 1000 gallons with an accumulating total rated at 119 gallons or more or an attached portable tank rated in excess of 1,000 gallons.
A Tank Vehicle endorsement is required if your vehicle needs a Class A or B CDL and you want to haul a liquid or liquid gaseous material in individual permanently mounted cargo tank(s) rated in excess of 119 gallons with an accumulating total rated at 1000 gallons or more or an attached portable tank rated in excess of 1,000 gallons.
I know......these definitions are mind-numbing, but you must know them. They may ask this on the test. If they do, they will almost certainly ask for the definition word-for-word from the manual. So just try to memorize that statement.
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Question #359 (5 of 7)

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When inspecting manhole covers on tankers, what must you check for?

  • There must be 1/4 inch of clearance between the cover and the seal
  • Make sure the hinges are orientated vertically, not horizontally
  • Make sure the covers have gaskets and they close correctly
  • The lip of the cover must be larger than the seal by 3/8 of an inch or more
Manhole covers and vents. Make sure the covers have gaskets and they close correctly. Keep the vents clear so they work correctly.
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Question #355 (6 of 7)

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Any tank vehicle that has been transporting hazardous materials must be purged of hazardous materials how many hours prior to testing?

  • 48 hours
  • 36 hours
  • 72 hours
  • 24 hours
Any tank vehicle that has been transporting hazardous materials must be purged of hazardous materials 48 hours prior to testing with documentation verifying the purge.
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Question #358 (7 of 7)

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Tankers often have Intake, discharge and cut-off valves. What should you check before loading, unloading, or moving the vehicle?

  • The valves are in the correct position
  • At least one of the valves are open
  • The valves are all closed
  • The valves are all open
Intake, discharge and cut-off valves. Make sure the valves are in the correct position before loading, unloading, or moving the vehicle.
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