LCL Consolidation · Dangerous Goods Compliance

To the LCL Operator: This Is What You’re Actually Signing Up For When You Mix Dangerous Goods

If you run an LCL/CFS consolidation operation, you carry two layers of responsibility every time you pack a CTU: what you owe as packer under the CTU Code regardless of what’s inside, and what IMDG Code adds the moment any of that cargo is dangerous goods. Most consolidators only think about the second layer. Here’s exactly where each one starts and ends.

What You Owe Every CTU — Before Dangerous Goods Even Enter the Picture

The CTU Code — the IMO/ILO/UNECE Code of Practice for Packing of Cargo Transport Units — sets your baseline duties as packer. It’s a recommended code of practice rather than a mandatory instrument in its own right, but it’s the technical standard regulators, carriers, port inspectors and courts point to when judging whether a CTU was properly packed. IMDG Code, by contrast, is mandatory under SOLAS Chapter VII Part A — that’s where your legal exposure actually sits. Either way, these duties apply whether or not a single dangerous goods package is in the load:

• CTU suitability. The unit has to be structurally sound, weatherproof(when applicable), clean, dry, and free of residue or odour from previous cargo — fit for the specific goods you’re about to load, not just whatever’s available in the yard.
• Accurate cargo information. You need weight, dimensions, and handling characteristics from the consignor before you start packing, not worked out after the fact.
• Weight distribution and verified gross mass. Packed weight has to sit within the CTU’s permissible limits and be spread evenly across the floor — concentrated point loads and overloaded axles are packing failures, not carrier failures.
• Packing arrangement. Heavy items low and centred, packages arranged to prevent shifting, with dunnage, blocking, and bracing suited to the transport mode.
• Securing. Cargo secured against the dynamic forces of the voyage — braking, cornering, rolling, and pitching — not just stacked and left.
• Documentation. Packing certificates and checklists completed and retained, with the correct transport documents accompanying the unit.
• Closure and sealing. Doors properly closed, locked, and sealed, with the seal number recorded before the CTU leaves your yard.

None of this has anything to do with dangerous goods yet. It’s simply what you owe every container you pack. Dangerous goods don’t replace these duties — IMDG Code adds a second, stricter layer on top of them.

Then Dangerous Goods Enter the Picture

Your shippers classify their dangerous goods, assign the UN number, Proper Shipping Name, Packing Group and (where applicable) technical name and flashpoint etc. They pack, mark, and label the packages, prepare the Dangerous Goods Declaration, and sign Box 22.

You take it from there. You run your own preliminary segregation check, decide which packages can share a CTU, and offer the consolidated load to the carrier as a single FCL booking. The carrier’s DG Desk then cross-references your booking information against the IMDG Code segregation table, hazard classes, subsidiary risks, and special segregation provisions etc and confirms which DG combinations it will accept in the same CTU. That confirmation guides your packing — it’s a check on the declared information, not an inspection of what you actually keep inside the box. You pack it accordingly, secure it, mark and placard it, and sign it off.

On paper, that looks like a shared responsibility. It isn’t. The DG Desk tells you what can go together on paper; everything about how it’s actually packed, segregated, secured, and placarded inside that CTU is yours.

The Document With Your Name On It: Box 20

You’re the “packer” under IMDG Code Chapter 5.4.2, which means you’re the one who signs Box 20, the Container/Vehicle Packing Certificate, on every dangerous goods declaration in that box — separate from Box 22, which belongs to the shipper. Under 5.4.2.1, when you sign Box 20 you’re certifying that:

• the container/vehicle was clean, dry, and apparently fit to receive the goods;
• packages requiring segregation under the applicable rules have not been packed together in the same container/vehicle, unless the competent authority approved otherwise under 7.3.4.1;
• every package was externally inspected for damage, and only sound packages were loaded;
• drums were stowed upright, unless the competent authority authorized otherwise, and all goods were properly loaded and, where necessary, adequately braced with securing material suited to the mode(s) of transport for the journey;
• any goods loaded in bulk were evenly distributed within the container/vehicle;
• for consignments including Class 1 goods other than Division 1.4, the container/vehicle is structurally serviceable in accordance with 7.1.2;
• the container/vehicle and packages are properly marked, labelled, and placarded, as appropriate;
• where substances presenting a risk of asphyxiation were used for cooling or conditioning — dry ice (UN 1845), refrigerated liquid nitrogen (UN 1977), or refrigerated liquid argon (UN 1951) — the container/vehicle is externally marked in accordance with 5.5.3.6; and
• a dangerous goods transport document, as indicated in 5.4.1, has been received for every dangerous goods consignment loaded into the container/vehicle.

One exception worth knowing: the container/vehicle packing certificate isn’t required for portable tanks.

That’s not paperwork. It’s the legal instrument that puts CTU suitability, internal segregation, securing, and external marking/placarding on you — because these are physical acts only you perform, and only you can certify.

Segregation Is Not Just a Table — It’s Much More

When Box 20 says you’ve complied with IMDG Code segregation rules, that’s not a single lookup against one table. Segregation runs through several distinct layers, and you need to be checking all of them, not just the generic table:

• Segregation table
• Single subsidiary hazard
• Multiple subsidiary hazards
• Same class, different subsidiary hazard
• No segregation required— water content variance or scientific evidence exists
• Segregation groups
• Segregation codes
• “Segregation as for class …”
• Segregation of class 1 goods — compatibility groups
• Segregation from foodstuffs
• Voluntary segregation for non-dangerous goods

Miss one of these layers and you can be technically “compliant” with the generic segeregation table while still packing an incompatible combination into your CTU. This is exactly why the DG Desk’s review exists as a second check — but it’s also exactly why you can’t treat their sign-off as a substitute for knowing these layers yourself.

Don’t Mistake the DG Desk’s Approval for Cover

The carrier’s job is to verify your booking information against the IMDG Code and applicable national/regional regulations, confirm the container is correctly placarded and marked, and track compliance through every port of call from load to final discharge. That’s a check on what you told them — not a substitute for what you actually did inside the box.

If your CTU is later found mis-segregated, poorly secured, or wrongly placarded, “the carrier approved it” won’t hold up. Box 20 carries your signature, not theirs. The DG Desk answers for stowage decisions aboard the ship. You answer for everything that happens inside the box before it gets there.

Foodstuffs Aren’t Optional — IMDG Chapter 7.3.4

Unlike the odour and non-DG issues below, this one is squarely regulatory, not judgment. Chapter 7.3 governs CTU packing operations, and 7.3.4 sets two different tiers: 7.3.4.2.1 identifies dangerous goods entries that must never be packed into the same CTU with foodstuffs, full stop, while 7.3.4.2.2 permits a defined set of lower-hazard entries to share a CTU with foodstuffs provided a minimum 3-metre separation is physically maintained throughout the container. The definition of “foodstuff” for this purpose is set out in 1.2.1. Check which tier your consignment’s segregation reference falls into against the current Dangerous Goods List — don’t assume from memory, since the exact code notation has shifted between amendments.

So this isn’t a blanket prohibition, but it isn’t an automatic workaround either. If your DG entry falls under 7.3.4.2.1, packing it with any foodstuff consignment breaches Box 20 the moment it’s packed, regardless of how correctly everything else in that container is segregated by class. If it falls under the 7.3.4.2.2 exception, you still have to physically establish and verify that 3-metre separation inside the CTU — noting the allowance on paper isn’t the same as maintaining it in the box.

The Segregation You Won’t Find in Any IMDG Table

Beyond foodstuffs, there are two more categories that land in your CTU just as often, and that no IMDG table covers — entirely your call to manage:

Non-DG chemicals stowed alongside DG. A drum that never triggered DG classification isn’t automatically safe next to a Class 3 or Class 8 consignment. Uninhibited resins, industrial cleaning agents, oxidizing food additives, and similar borderline chemicals can still react, corrode, or contaminate — a fire or reaction doesn’t check UN numbers before it starts. Applying the same separation logic you’d use for classified DG, even to cargo that never made it onto a declaration, is part of your duty to keep the container fit to receive the goods.

Odour-emitting cargo next to odour-absorbing cargo. This has nothing to do with IMDG compliance and everything to do with your commercial exposure. Strong odour-emitters — solvents, rubber, hides, perfumery bases, naphthalene, certain chemicals — packed near odour-absorbers — tea, coffee, spices, foodstuffs, textiles, cosmetics — produce taint claims even when every package in the box is fully DG-compliant and nothing dangerous ever happened. It’s the most common LCL claim you’ll face that has nothing to do with an incident.

You need a second segregation layer on top of the regulatory one: know which of your regular consignments are known odour-emitters or odour-absorbers, and keep them apart — or use barrier stowage and adequate ventilation planning — regardless of what the IMDG segregation table says about the DG in the box.

What It Costs You If You Get This Wrong

• Fire and reaction incidents. Most container fires traced to dangerous goods start at the packing stage — mis-segregation, an undamaged-looking package that wasn’t properly inspected — not from a carrier stowage error.
• Port State Control detention. Incorrect placarding or a false packing certificate can get the CTU detained, holding up every shipper’s cargo in that box, not just the DG.
• P&I and cargo insurance disputes. Insurers deny cover when a packing certificate turns out to be inaccurate — you’re left exposed to the carrier’s general average and third-party claims.
• Carrier blacklisting. DG Desks keep records. A poor segregation/packing track record gets you cut off from bookings — a consequence that outlasts any single incident.
• Personal and corporate liability. Box 20 is a legal declaration with your signature on it. If it’s false, liability doesn’t stop at your company — it can reach you personally, and in serious incidents, criminal exposure isn’t off the table.
• Taint and contamination claims. No DG incident required. Odour cross-contamination between an emitter and an absorber in the same box is a straightforward cargo claim against you as consolidator, and it recurs precisely because it’s treated as a lesser risk than DG compliance.

Training Is Your Actual Safety Net — Not the DG Desk

Every point above traces back to one thing: whether the people physically packing your CTUs were trained to read a segregation table, spot a damaged package, or know what the CTU Code requires for securing. Box 20 is only as reliable as the competence of the person completing the pack.

IMDG Code Chapter 1.3 requires general awareness, function-specific, and safety and security training for anyone packing dangerous goods for transport. For your operation specifically, that means your floor staff need function-specific training covering segregation groups, compatibility exceptions, CTU Code securing requirements, marking/placarding, and the legal weight of the certificate they’re signing off on. Refresher training at the prescribed interval isn’t a compliance checkbox — it’s what keeps Box 20 meaningful.

If you’re treating the DG Desk’s approval as your safety net instead of your own packing floor’s competence, you’ve misread where the risk actually sits.