An empty container released under the correct number and equipment type is not automatically suitable for cargo stuffing. A pinhole in the roof, a damaged door gasket, cracked or wet flooring, protruding nails, persistent chemical odour, standing water, pest traces or illegible weight markings can damage cargo, create equipment-condition disputes or lead to terminal rejection. The exposure is particularly high for machinery with finished surfaces, electrical and electronic components, corrosion-sensitive parts and palletised cartons. This article provides an inspection matrix by container area, acceptance and rejection criteria, evidence requirements and an end-to-end control process from empty pick-up to sealing, VGM submission and full gate-in.

QUICK FACTS

INSPECT BEFORE THE FIRST PACKAGE

Acceptance must be completed while the unit is empty; defects found after stuffing may require cargo stripping and equipment replacement.

THREE ACCEPTANCE LAYERS

The container must be structurally safe, suitable for the actual commodity and supported by a traceable handover record.

CSC IS NOT THE ONLY CHECK

CSC and either an ACEP mark or NED relate to safety approval and examination; they do not replace checks for weather-tightness, cleanliness, dryness, odour and flooring.

SYSTEMATIC PHOTO RECORD

Photos or video should show the container number, all sides, doors, floor, roof, defects and inspection time.

SCOPE OF APPLICATION

Primarily applicable to dry 20DC, 40DC and 40HC containers used for FCL exports, especially machinery, industrial components, electrical/electronic equipment, metal parts and palletised/carton cargo. The framework may be adapted for other equipment, but reefers, open tops, flat racks, tanks, dangerous goods, food cargo and quarantine-sensitive cargo require additional controls.

This article does not replace the container owner’s repair criteria, depot rules, booking confirmation, terminal requirements, carrier instructions or specialist engineering assessment where structural damage is suspected. Do not weld, drill, patch or otherwise repair carrier equipment without approval.

KEY TERMS

Term	Meaning	Operational role
CTU – Cargo Transport Unit	A freight transport unit; a freight container is one form of CTU.	The CTU Code provides guidance on inspection, packing and cargo securing.
CSC Safety Approval Plate	Safety approval plate under the CSC Convention.	Confirms approval and key technical ratings; it is not a guarantee that the unit is clean, dry or weather-tight.
ACEP or NED	Approved Continuous Examination Programme mark / Next Examination Date under the periodic examination scheme.	These are alternative regimes: the unit should show a valid ACEP mark or a NED that remains valid for the expected journey.
Light test	Doors are closed and the interior is observed for abnormal light entry.	Screens for visible holes or gaps; it does not prove weather-tightness and is not a substitute for an approved leakage test.
EIR – Equipment Interchange Receipt	Equipment handover record at a depot or terminal.	Records container number, time, place and noted condition at interchange.
Tare / Payload / Max Gross	Container empty mass / permitted cargo mass / maximum gross mass.	Controls the loading plan and VGM data; values must be read from the actual unit.
High Security Seal	Mechanical high-security seal under the carrier policy and applicable standard.	Protects post-stuffing integrity; the number and placement must be recorded.

NATURE OF CONTAINER ACCEPTANCE

1. A safety-approved unit may still be unsuitable for the commodity

CSC focuses on structural safety approval and examination. The packer must still assess the actual roof, walls, floor, doors, weather-tightness, cleanliness, dryness, odour, pests, prior-cargo residues and securing capability. A plated container with strong chemical odour may be unacceptable for sensitive components or paper packaging.

2. Inspection responsibility must be tied to the handover event

The stuffing team should inspect the empty unit immediately after release and before the first package enters. Once the container is used without documenting pre-existing defects, it becomes harder to prove that damage existed before handover. The EIR should be read together with time-stamped photos, video and an exception report.

3. Acceptance criteria depend on cargo characteristics

Heavy machinery requires no visible floor damage, verified concentrated-load distribution and suitable securing arrangements; electronic components require a dry, weather-tight unit and condensation controls; cartons and pallets require dry floors, no protruding nails and no roof or wall leakage. A generic “good condition” statement is therefore insufficient.

4. Pre-stuffing acceptance is not structural certification

The shipper or warehouse check is a visual and operational acceptance layer. If a corner post, casting, frame, floor or repair raises structural doubt, stop and refer the unit to the owner, depot or competent surveyor; photographs and visual checks alone must not be treated as structural certification.

Control point: Stop stuffing when a defect affects safety, weather-tightness, cleanliness/dryness or securing capability. Obtain written confirmation from the depot/carrier for equipment replacement or an approved remedy.

INSPECTION MATRIX BY CONTAINER AREA

Area	Checks	Acceptable indication	Stop / replace indication	Evidence
Identification and markings	Container number, size/type code, tare, max gross and payload; CSC plate; ACEP mark or NED; placards/labels from previous cargo.	Matches booking/EIR; markings are legible; valid ACEP or a NED covering the expected journey; obsolete placards removed while permanent markings remain.	Wrong unit/type; no CSC plate; no ACEP and NED expired or expiring before destination; conflicting or illegible ratings.	Left/right door, full plate/marking photos and empty EIR.
External frame and corners	Corner posts, castings, side rails, end frames and walls; also inspect bottom rails, forklift pockets, twist-lock areas and accessible understructure.	No obvious fracture, severe deformation, hole or hazardous edge; no soil, seeds, nests or other external recontamination.	Crack, structural break, damaged casting, severe bulge, hazardous edge or evidence of recontamination/pests.	All four corners and sides, safely accessible understructure and close-ups.
Roof and weather-tightness	External/internal roof, seams; light test with doors closed.	No hole, abnormal light, standing water or loose patch.	Hole, tear, light entry, loose repair or water-stain pattern.	Light-test video; roof photos where safely accessible.
Doors, gaskets and locking gear	Door leaves, hinges, locking rods, keepers, gaskets and seal hole.	Doors operate; locking gear engages; gasket is continuous; seal point is intact.	Jammed doors, failed locks, torn/missing gasket, large gap or damaged seal point.	Door-operation video and detail photos.
Floor and load area	Boards, joints, nails/screws, oil, moisture, holes, depressions and support points.	Dry, clean, level enough, no protruding nails or holes.	Rot, major crack, wet/oily/chemical contamination, protruding nails or inadequate support for the plan.	Floor photos by bay; moisture readings if used.
Interior hygiene	Odour, dust, rubbish, chemicals, loose rust, mould, pests and water.	Clean, dry, free of persistent odour, residues and pest evidence.	Chemical/mould odour, insects/droppings, standing water or unidentified residues.	Interior overview and exception report.
Securing points	Lashing rings/bars, walls and working clearance.	Points are intact and suitable for the intended securing plan.	Broken, bent or heavily corroded points; insufficient securing locations.	Photos of each intended point and lashing plan.
Container/chassis positioning	Ground or chassis, brakes, wheel chocks, landing gear/tractor support, dock plate/ramp and working clearance.	Firm, level and drained position; stable chassis; brakes/chocks applied; safe access into the unit.	Soft, sloping or flood-prone ground; trailer tip risk when a lift truck enters; unsuitable ramp; doors cannot be closed safely.	Positioning photos, wheel/chock and ramp record, pre-stuffing safety sign-off.

CARGO-SPECIFIC ACCEPTANCE CRITERIA

Commodity group	Main exposure	Additional control	Data to lock before stuffing
Machinery and heavy skids	Concentrated floor load, sliding, overturning and oil leakage.	Calculate footprint, load spreading, dunnage, anti-slip, centre of gravity and lashing; do not infer lashing-ring capacity visually—obtain owner/operator data for high loads.	Weight, footprint, COG, lifting/securing points, stuffing drawing and securing-point limits where used.
Corrosion-sensitive metal parts	Condensation, salt-laden air, leakage and chemical odour.	Use a dry, weather-tight unit; engineer moisture barrier, desiccant, VCI and ventilation as appropriate.	Humidity target, transit time and corrosion-protection packaging.
Electrical/electronic equipment	Moisture, water, conductive dust, shock and vibration.	No hole or leakage indicators; dry floor; sealed packaging; manage wall/roof condensation exposure.	Humidity limit, orientation and shock/tilt indicator requirements.
Cartons and pallets	Water absorption, corner crush, floor nails, odour and pests.	Flat dry floor, no protruding nails, roof and walls without leakage indicators; compliant wood packaging where required.	Pallet dimensions, stacking limits, door clearance and ISPM 15 status if applicable.
Odour-sensitive cargo	Cross-contamination from previous cargo.	Assess odour after doors remain closed; do not mask the odour instead of removing the source.	Internal acceptance threshold and prior-cargo information where available.
DG, reefer or special equipment	Controls exceed the dry-container framework.	Apply IMDG/booking approval, PTI, temperature, ventilation, placarding and equipment-specific instructions.	UN number/class, SDS, set point, ventilation and carrier approval.

DOCUMENTS, DATA AND EVIDENCE

Document/data	Source	Reviewer	Fields to match	Purpose
Booking confirmation / release order	Carrier, NVOCC or forwarder	Logistics/Operations	Equipment type, depot, window, booking and commodity.	Ensure the correct equipment and booking conditions.
Empty EIR	Depot/terminal	Driver and operations	Container no., time, place and damage notation; note that an EIR may not record every interior or subsequently identified defect.	Establishes interchange timing; read with photos/video and an exception report.
Inspection photos/video	Warehouse/stuffing team	Warehouse supervisor / QA	Container number, sides, doors, floor, roof, defects and timestamp.	Evidence of pre-stuffing condition.
Cargo list / Packing List / loading plan	Shipper, warehouse, engineering	Operations/Engineering	Packages, gross mass, dimensions, COG, position and sequence.	Assess load distribution and securing.
CSC, ACEP or NED and weight markings	Actual container	Inspector	CSC plate; max gross; tare; payload if shown; valid ACEP or NED covering the expected journey.	Confirms limits, identity and the applicable safety examination regime.
Seal record	Warehouse/shipper or carrier	Documentation/Operations	Seal type/number, container and sealing time.	Maintain chain of custody and SI/B/L accuracy.
VGM record	Shipper or authorised party	Documentation/Logistics	Container, VGM, method, signatory and submission time.	Comply with SOLAS and align declarations.

EIGHT-STEP ACCEPTANCE AND CONTROL PROCESS

Step	Input	Control action	Mandatory output
1. Define cargo requirements	Cargo data, booking and route.	Identify load, moisture, odour, dust, DG, wood-packaging and equipment risks.	Cargo-specific acceptance criteria.
2. Receive the empty, read EIR and verify positioning	Release order, EIR and actual container/chassis.	Match equipment and damage notation; verify ground/chassis, brakes, wheel chocks, ramp and stability before a lift truck enters.	Correct EIR, identity photos and safe-positioning sign-off.
3. Check markings and examination regime	CSC plate, ACEP mark or NED, tare and max gross.	Read the actual unit. Without ACEP, the NED must remain valid and not expire before destination; no CSC plate means the unit should not be used in international traffic.	Confirmed limits or hold for owner/depot verification.
4. Inspect exterior	All sides, roof, frame and corner fittings.	Check for deformation, cracks, holes, sharp edges and suspicious repairs.	Exterior report and close-ups.
5. Check doors, ventilation and light test	Doors, gaskets, locks, seal point and internal atmosphere.	Ventilate before entry; operate the locking gear; use a two-person light-test procedure, never lock anyone inside and do not access the roof without safe access/fall protection.	Door/light-test/seal-point conclusion and safety record.
6. Inspect interior, floor and recontamination	Floor, inner roof/walls, odour, liquids, residues, bottom rails/forklift pockets and securing points.	Confirm clean, dry and free from persistent odour/residue and pest evidence; verify securing points for the plan.	Cargo-suitability conclusion and exception report where needed.
7. Accept or reject	Inspection findings and acceptance criteria.	Document defects; notify depot/carrier; repair or replace only under approved instructions.	Accept/reject record and written disposition.
8. Stuff, seal and submit VGM	Loading plan, packing record and seal.	Stuff and secure; take layer photos; seal; create VGM; update SI and gate in.	Packing report, seal record, VGM and gate-in EIR.

ACCEPT / REJECT MATRIX

Condition	Potential conditional acceptance	Stop and request remedy/replacement	Reason
Surface scratch/rust	No sharp edge, loose scale or structural effect.	Perforation, large flaking, sharp edge or location near structural member.	Contamination, package damage or structural risk.
Wall/roof dent	Minor, no hole and no interference with cargo/door/securement.	Severe deformation, cracking, contact with cargo or frame/door impact.	Reduced clearance and structural/handling exposure.
Repair patch	Dry, secure, no leak and accepted by equipment owner.	Loose/open, light/water entry or unauthorised self-repair.	Water-tightness and equipment-condition risk.
Floor stain	Dry, odourless and free from oil/chemicals.	Wet, oily, chemical, mouldy or unidentified residue.	Contamination, slip and packaging damage.
Door gasket	Light dirt but continuous and closing properly.	Torn, missing or deformed with a visible gap.	Water, dust and pest ingress.
CSC / ACEP or NED	CSC plate present; valid ACEP or NED that does not expire before expected destination arrival.	No CSC plate; no ACEP and NED expired/expiring before destination; illegible markings or safety doubt.	Do not infer validity; hold for owner/depot verification.

COMMON RISKS AND ERRORS

Error	Cause	Impact	Control
Photos only after stuffing	No pre-stuffing acceptance process.	Pre-existing damage cannot be proven; cargo may need stripping.	Capture before the first package and assign an approver.
Interior-only inspection	Exterior roof, frame and corner fittings are ignored.	Impact damage or leak-prone repairs remain undetected.	Walk around first, then conduct the internal light test.
Passing light test treated as weather-tightness proof	Screening method is misunderstood.	Gaskets or seams may still leak under rain and vibration.	Treat light test as screening; resolve any leak indicator.
Using generic tare data	Actual container markings are not read.	Incorrect payload or Method 2 VGM.	Photograph tare/max gross on the actual unit.
Odour/residue ignored	Only visual cleanliness is checked.	Taint, corrosion or destination quality rejection.	Assess odour with doors closed and document unknown residues.
Sound floor but excessive point load	No load engineering.	Floor failure, skid settlement or machinery movement.	Calculate footprint, load spreading, dunnage and securing.
Correct seal number but poor application	No sealing control.	Tampering exposure or terminal/carrier intervention.	Use approved seal, photograph placement and number.
Unauthorised equipment repair	Schedule pressure.	Repair dispute, safety exposure or gate-in refusal.	Obtain written instruction; replace the unit where acceptance is affected.
Entering a closed unit or climbing the roof without controls	Insufficient ventilation, supervision or safe access.	Exposure to residues, entrapment or a fall from height.	Ventilate before entry; use a two-person light-test procedure and never lock a person inside; do not access the roof without approved access and fall protection.

OPERATIONAL REFERENCES

The following references support an internal control procedure. The CTU Code is a code of practice; binding requirements and contractual obligations also depend on conventions, applicable law, booking terms, carrier/terminal rules and cargo type.

Reference	Issuer	Status/role	Use in this article
IMO/ILO/UNECE CTU Code	IMO, ILO, UNECE	MSC.1/Circ.1497, endorsed by IMO/ILO/UNECE in 2014; a code of practice, not an equipment-condition certificate.	Packer responsibility, CTU checking, packing and securing.
UNECE CTU Code portal	UNECE	Official portal for the CTU Code, annexes and supporting implementation material.	Detailed implementation references.
International Convention for Safe Containers	IMO	1972 Convention, in force since 6 September 1977; covers approval, examination and structural safety requirements.	CSC plate and examination framework.
SOLAS Verified Gross Mass	IMO	VGM requirement for packed containers within SOLAS scope.	Post-stuffing VGM control.
ISO 17712:2013 – Mechanical seals	ISO	Mechanical seal classification/testing standard; reviewed in 2023.	Seal selection and security.
Maersk – Container stuffing explained	Maersk	Operational guidance on inspection, stuffing and cargo distribution.	Practical pre-stuffing reference.
Hapag-Lloyd – Container Seal Policy	Hapag-Lloyd	Carrier policy on high-security seals for laden containers.	Reminder to check the actual carrier policy.
BIC ACEP Database	Bureau International des Containers (BIC)	Database of ACEP programme identifiers approved by competent authorities.	Verify an ACEP mark where the approval number is unclear or requires additional validation.

FAQ

Is inspection still required when the CSC plate is valid?

Yes. CSC relates to safety approval/examination; the stuffing team must still check actual condition and commodity suitability.

Does a successful light test prove weather-tightness?

No. It screens visible holes/gaps. Door gaskets, seams and patches may still leak under rain and vibration.

May the shipper patch a small hole with silicone or tape?

Do not self-repair carrier equipment. Notify the depot/owner and obtain approval; a leak-related defect normally requires approved repair or replacement.

Must ACEP and NED both appear on the container?

No. They are alternative examination regimes. A valid ACEP mark does not require a separate NED; without ACEP, the NED must remain valid and must not expire before the expected arrival at destination.

Must the floor be checked for lightweight cartons?

Yes. Nails, moisture, oil, odour and floor holes can still tear, stain or destabilise pallets.

How many photos are enough?

There is no universal number. The set must reconstruct the unit condition: identity, all sides, doors/gaskets/locks, floor, inner roof/walls, markings and every defect.

Does container inspection replace the loading and securing plan?

No. Equipment acceptance is only an input; load distribution, dunnage, securing and VGM remain separate controls.

APPLICATION NOTE: Acceptance criteria must be adjusted to the commodity, route, climate, equipment type and carrier/depot policy. Structural damage, unidentified chemicals, fumigation, pest evidence, dangerous goods, reefer cargo or high concentrated loads require specialist assessment before use. This is an operational reference and not a technical determination by the equipment owner or competent authority.

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