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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:
On all tank vehicles, the most important item to check for is:
- Dirt around the outlet
- Clogged vents
- Rust around the lip of the rim
- Leaks
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 119 gallons.
- 1000 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.
- 119 gallons with an accumulating total rated at 1000 gallons or more or an attached portable tank rated in excess of 1,000 gallons.
Tankers often have Intake, discharge and cut-off valves. What should you check before loading, unloading, or moving the vehicle?
- The valves are all closed
- At least one of the valves are open
- The valves are in the correct position
- The valves are all open
When can you drive a tanker with open valves or manhole covers?
- If the weather permits
- If the tank is empty
- If the materials are not hazardous
- Never
When inspecting manhole covers on tankers, what must you check for?
- Make sure the hinges are orientated vertically, not horizontally
- The lip of the cover must be larger than the seal by 3/8 of an inch or more
- There must be 1/4 inch of clearance between the cover and the seal
- Make sure the covers have gaskets and they close correctly
Any tank vehicle that has been transporting hazardous materials must be purged of hazardous materials how many hours prior to testing?
- 36 hours
- 72 hours
- 48 hours
- 24 hours
What should you do if you're pulling a tanker and you find a small leak?
- Never carry liquids or gases in a leaking tank
- 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
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