Twenty-Four Drums, Twelve Boxes, One Stretch-Wrapped Pallet
You are at a paint plant in Ohio to load a partial trailer for Kentucky. The shipper presents two lots.
Lot A: 24 open-head steel drums, each holding 55 gallons of UN1263, Paint, PG II. Each drum carries the certification mark "1A2/Y1.6/150/21/USA/M7781" stamped on the top head, plus the word "PAINT" stenciled beside it. No UN number appears anywhere on the drums.
Lot B: 12 fiberboard boxes, each containing four 1-gallon metal cans of the same paint. Each box is marked "UN1263, Paint, 3, PG II" and carries "4G/Y25/S/22/USA/M3310." The boxes are stacked and stretch-wrapped onto a wooden pallet. The wrap is opaque enough that the box markings cannot be read on three of the four sides, and no arrow markings are visible. The shipper describes the pallet as "just a pallet, not a package."
1. Decode the drum certification mark and determine whether the drums as marked are acceptable for shipment.
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Reading left to right: 1A2 is an open-head (removable head) steel drum; Y means the design is authorized for packing groups II and III; 1.6 is the maximum specific gravity the design was tested for; 150 is the hydrostatic test pressure in kPa; 21 is the year of manufacture; USA is the country of authorization; M7781 is the manufacturer's symbol. Paint at PG II falls within the Y rating, and its specific gravity is well below 1.6, so the packaging design itself is fine. The mark does not expire.
What fails is the hazard communication. Each non-bulk package must be marked with the proper shipping name and the UN identification number. "PAINT" without "UN1263" is incomplete; the drum needs both, legibly and durably, in English, on a contrasting background. The certification mark is a packaging specification, not a substitute for the shipping name and number. Also confirm each drum is in good condition, with no dents, corrosion, or weeping fittings, and that the closure is the one the design was tested with.
2. The 12 boxes are stretch-wrapped on a pallet. What marking and labeling is required on the pallet, and why does the phrase "just a pallet" matter?
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A pallet used to consolidate packages is an overpack, and a stretch-wrapped unit is treated the same way. Three consequences follow.
First, the packages inside must themselves be authorized and correctly marked and labeled - the wrap does not excuse the inner boxes' markings.
Second, because the wrap hides the boxes' markings and labels on three sides, the pallet itself must bear the required markings and labels: the word OVERPACK and the FLAMMABLE LIQUID label, positioned where they can be seen. If a limited quantity or other package mark is required on the inner boxes and is not visible through the wrap, that mark must be reproduced on the overpack as well. The overpack must not reduce the required label size or obscure any hazard communication.
Third, the overpack may not be used to make an unauthorized packaging compliant. If the inner boxes were wrong, wrapping them would not fix the problem.
Calling it "just a pallet" is an attempt to escape the overpack rules based on what the object is made of rather than what it does. It functions as an enclosure, so the overpack requirements apply.
3. The boxes contain 1-gallon cans of liquid paint. What orientation marking should be present, and where? Does the same requirement apply to the drums?
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Combination packagings containing liquid inner packagings must bear orientation arrows - two arrows, on two opposite vertical sides of the package, pointing up, printed or applied so they stay legible. The 4G box with four 1-gallon metal cans is exactly the case the rule targets: if the box is laid on its side, the cans can leak through their closures, so the arrows tell handlers which way is up. If the arrows are absent, the shipper must add them before the boxes are loaded; the stretch wrap does not make them optional, and arrows hidden under opaque wrap do not count.
The drums are different. A 1A2 steel drum is a single packaging, not a combination packaging with liquid inners, so orientation arrows are not required on it. The drum's protection comes from the closure and from proper outage - the drum must not be filled so full that expansion at elevated temperature can force the bung or deform the head.
So: arrows on the pallet's outer faces if the box arrows are hidden, and no arrows on the drums.