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9.5.2 – Hazmat Tank Loading

The person in charge of loading and unloading a cargo tank must be sure a qualified person is always watching. This person watching the loading or unloading must:

  • Be alert.
  • Have a clear view of the cargo tank.
  • Be within 25 feet of the tank.
  • Know of the hazards of the materials involved.
  • Know the procedures to follow in an emergency.
  • Be authorized to move the cargo tank and able to do so.

There are special attendance rules for cargo tanks transporting propane and anhydrous ammonia.

Close all manholes and valves before moving a tank of hazardous materials, no matter how small the amount in the tank or how short the distance. Manholes and valves must be closed to prevent leaks. It is illegal to move a cargo tank with open valves or covers unless it is empty, according to 49 CFR 173.29.

9.5.3 – Flammable Liquids

Turn off your engine before loading or unloading any flammable liquids. Only run the engine if needed to operate a pump. Ground a cargo tank correctly before filling it through an open filling hole. Ground the tank before opening the filling hole and maintain the ground until after closing the filling hole.

9.5.4 – Compressed Gas

Keep liquid discharge valves on a compressed gas tank closed except when loading and unloading. Unless your engine runs a pump for product transfer, turn it off when loading or unloading. If you use the engine, turn it off after product transfer, before you unhook the hose. Unhook all loading/unloading connections before coupling, uncoupling, or moving a cargo tank. Always chock trailers and semitrailers to prevent motion when uncoupled from the power unit.

Multiple-Choice Questions:

Question #424 (1 of 2)

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What must you do before loading flammable liquids?

  • Open all valves on the tank
  • Contact the hazmat response team to let them know you're being loaded
  • Turn off your engine and ground the cargo tank
  • All these are correct

9.5.3 – Flammable Liquids

Turn off your engine before loading or unloading any flammable liquids. Only run the engine if needed to operate a pump. Ground a cargo tank correctly before filling it through an open filling hole. Ground the tank before opening the filling hole and maintain the ground until after closing the filling hole.

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Question #423 (2 of 2)

Give a brief explanation of the problem:

Optional: Leave your email address if you would like a reply:

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The person in charge of loading and unloading a hazmat cargo tank must:

  • Have a clear view of the cargo tank
  • Know of the hazards of the materials involved
  • All these are correct
  • Be within 25 feet of the tank

The person in charge of loading and unloading a cargo tank must be sure a qualified person is always watching. This person watching the loading or unloading must:

  • Be alert.
  • Have a clear view of the cargo tank.
  • Be within 25 feet of the tank.
  • Know of the hazards of the materials involved.
  • Know the procedures to follow in an emergency.
  • Be authorized to move the cargo tank and able to do so.
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