3.2 Bulk Packaging & Cargo Tanks
Key Takeaways
- A bulk package for a liquid has a maximum capacity greater than 119 gallons; non-bulk is 119 gallons or less.
- A bulk package of any quantity of a Table 2 hazardous material must be placarded on all four sides — the 1,001-pound rule applies only to non-bulk packages.
- A placarded cargo tank, or any vehicle carrying Division 1.1, 1.2, or 1.3 explosives, must never be left unattended.
- A tanker driver must inspect the tank, valves, and fittings before loading and after unloading, plus normal pre-trip checks.
- Cargo tanks must be inspected, tested, and marked on a federally required schedule, and flammable-liquid or gas tanks have extra grounding and venting precautions.
Bulk vs. Non-Bulk Packaging
The HazMat exam expects you to know whether a package is bulk or non-bulk, because that single classification changes the placarding, marking, and inspection rules.
Bulk packaging is a single container with no intermediate form of containment. A liquid bulk package has a maximum capacity greater than 119 gallons. Cargo tanks, portable tanks, large intermediate bulk containers (IBCs), and tank cars are bulk packages.
Non-bulk packaging is anything smaller — a liquid non-bulk package holds 119 gallons or less. Drums, boxes, jerricans, and cylinders are typical non-bulk packages.
| Package type | Liquid capacity | Solid capacity | Examples |
|---|---|---|---|
| Non-bulk | 119 gallons or less | 882 lb (400 kg) or less net mass | Drums, boxes, cylinders |
| Bulk | Greater than 119 gallons | Greater than 882 lb (400 kg) | Cargo tanks, IBCs, portable tanks |
Why the Difference Matters for Placarding
For non-bulk Table 2 materials, placards are required only when the vehicle carries 1,001 pounds or more aggregate gross weight. For a bulk package, that threshold does not apply: a bulk package of any quantity of a placardable material must be placarded on all four sides of the vehicle. A 1,500-gallon cargo tank of gasoline is placarded FLAMMABLE even though no "1,001-pound" calculation was ever needed.
Cargo Tank Rules
A cargo tank is a bulk container permanently attached to (or forming part of) a vehicle. Cargo tanks carry fuels, gases, acids, and other liquids in large quantity, so the regulations are strict.
Key cargo-tank rules:
- Placard all four sides for the material carried, regardless of quantity.
- Qualified attendant required during loading/unloading. A person who understands the hazards and knows the emergency procedures must watch the operation, stay within 25 feet, and have a clear view of the tank.
- Engine off during loading/unloading of flammable liquids unless the engine drives the transfer pump.
- Inspect before loading and after unloading. The driver must inspect the tank shell, valves, fittings, manhole covers, and closures to confirm they are secure and not leaking.
- Cargo tanks must be periodically tested and marked. Federal rules require visual inspections, pressure/leakage tests, and thickness tests on a set schedule; the test dates are stamped or marked on the tank's specification plate.
The Attendance Requirement
Certain loads can never be left unattended. A vehicle is "attended" when a person who is awake, not in the sleeper berth, and within 25 feet with an unobstructed view of the vehicle is in control of it.
Attendance is required for:
- A placarded cargo tank during loading, unloading, and (with limited exceptions) while parked.
- A vehicle carrying Division 1.1, 1.2, or 1.3 explosives, which must be attended at all times unless parked in an approved safe haven or a secure carrier/consignee facility.
The person attending must know the emergency procedures, be able to move the vehicle if needed, and have the equipment and knowledge to respond to a leak or fire.
Special Rules for Flammable-Liquid and Gas Tankers
Flammable liquids and compressed gases give off vapors that can ignite from a single spark, so tankers hauling them carry extra precautions.
Flammable-Liquid Tankers
- Ground/bond the tank before and during loading of flammable liquids so static electricity cannot build up and arc into vapor.
- No smoking within 25 feet, and shut the engine off during loading or unloading unless it powers the transfer pump.
- Be alert to liquid surge — a partially full "baffled" or "unbaffled" tank lets liquid slosh, which can shove the vehicle forward at a stop. Brake early and smoothly.
- Beware of the high center of gravity of a loaded tank; take curves and ramps well below the posted speed.
Compressed-Gas Tankers (Division 2.1 / 2.2)
- Gas tanks operate under pressure; valves and relief devices must be checked and protected from damage.
- Cargo heaters are prohibited with Division 2.1 flammable gas.
- Some gases are also poison-inhalation hazards (for example, anhydrous ammonia) and carry both a gas placard and a poison/inhalation-hazard placard.
The core idea for the exam: a tanker is a single huge container, so a tank failure releases the entire load at once — which is why inspection, attendance, grounding, and smooth driving all matter more for tankers than for boxed freight.
A bulk packaging for a liquid is defined as one with a maximum capacity greater than:
A tank trailer is loaded with 1,500 gallons of gasoline (UN1203, Class 3). What placarding is required?
When must a driver of a placarded cargo tanker inspect the tank, valves, and fittings?