1. What Is the CSC Convention?
The CSC (International Convention for Safe Containers) is an international convention established in 1972 by the United Nations' International Maritime Organization (IMO). It formally entered into force in September 1977. As of 2026, it has more than 80 Contracting States, covering the world's major maritime nations.
Core Objectives of the Convention
| Objective | Specifics |
| Ensure Safety | Guarantee the structural safety of containers during transport, ensuring they pose no hazard to personnel, cargo, or vessels |
| Unified Standards | Establish unified international standards for container design, manufacture, inspection, and repair |
| Streamline Clearance | Simplify security inspection procedures for containers in international transport through CSC plate certification |
Legal Status of the Convention
The CSC Convention is a mandatory convention under the IMO framework. All containers engaged in international maritime transport must hold a valid CSC Safety Approval Plate. Failure to do so gives the carrier the right to refuse loading.
Legal Basis: Original text of the CSC Convention (IMO Publication IA574E) + Amendments adopted at the 109th Session of the IMO Maritime Safety Committee (MSC) in 2025.
2. Decoding the CSC Plate
Every container used in international transport must have a CSC Safety Approval Plate permanently affixed to a prominent position on the door. The meaning of each field is as follows:
┌─────────────────────────────────────────────┐
│ CSC SAFETY APPROVAL │
│ (GB/OU/00123/2026) │ ← ① Approval Country / Approval No. / Year
│ │
│ DATE MANUFACTURED : 2025-06 │ ← ② Date Manufactured
│ IDENTIFICATION NO. : MSCU1234567 │ ← ③ Container ID Number
│ MAXIMUM GROSS WEIGHT: 30,480 KG │ ← ④ Maximum Gross Weight
│ 67,200 LB │
│ ALLOWABLE STACKING WEIGHT: 192,000 KG │ ← ⑤ Allowable Stacking Weight
│ 423,280 LB │
│ RACKING TEST LOAD: 15,240 KG │ ← ⑥ Racking Test Load
│ 33,600 LB │
│ │
│ ┌──────────────────────────────────┐ │
│ │ EXAMINATION SCHEDULE │ │
│ │ PES: 2030-06 (1st) │ │ ← ⑦ Next Examination Date
│ │ ACEP: 2028-06 (1st) │ │
│ └──────────────────────────────────┘ │
└─────────────────────────────────────────────┘
| Field | Meaning | Explanation |
| ① Approval Country / No. | Code of the Contracting State issuing the plate (GB=United Kingdom, CN=China) | Chinese plates are issued by China Classification Society (CCS) |
| ② Date Manufactured | Factory completion date of the container | Used to calculate examination intervals |
| ③ Identification No. | Unique container identifier | 1st character: Owner code |
| ④ Max Gross Weight | Tare weight + maximum permissible cargo weight | 20GP approx. 30,480 kg; 40GP approx. 32,500 kg |
| ⑤ Allowable Stacking Weight | Maximum load the container can bear when stacked | Typically 1.8 times the Max Gross Weight |
| ⑥ Racking Test Load | Capacity to resist lateral deformation | 15,240 kg for new-build containers |
| ⑦ Examination Date | Due date of next examination | PES or ACEP examination |
3. PES and ACEP Inspection Regimes
The CSC Convention prescribes two inspection regimes. Container owners may choose based on their circumstances.
3.1 PES (Periodic Examination Scheme)
PES is the traditional inspection regime, also referred to as the "Periodic Examination Scheme." The first full examination occurs 5 years after the new container leaves the factory, with subsequent examinations every 30 months thereafter.
| Item | PES |
| First Examination | 5 years after manufacture |
| Subsequent Interval | Every 30 months |
| Examination Method | Must be carried out by an authorized inspection body |
| Examination Scope | Structural integrity, container seals, door condition, CSC plate |
| Applicable Situation | The majority of existing containers |
| Advantages | Long examination interval, low administrative cost |
| Disadvantages | Faults may not be detected promptly; potential safety hazards may arise between examination intervals |
PES examination timeline: Ex-Factory → 5 Years (1st) → 7.5 Years (2nd) → 10 Years (3rd) → 12.5 Years (4th) ...
3.2 ACEP (Approved Continuous Examination Programme)
ACEP is a continuous examination program, an alternative offered to container owners certified under an ISO 9001 quality system. The owner establishes an internal inspection procedure approved by an authorized body, enabling "inspect anytime, maintain anytime."
| Item | ACEP |
| First Examination | 5 years after manufacture (same as PES) |
| Subsequent Mode | Continuous examination, no fixed interval |
| Examination Method | Executed internally by the owner (requires an approved procedure) |
| Applicable Situation | Large container owners (with a substantial owned fleet) |
| Advantages | Flexible inspections, enhanced safety control, reduced operational disruption risk |
| Disadvantages | Requires establishing an internal inspection system and quality management procedures |
3.3 PES vs ACEP Comparison
| Comparison Dimension | PES | ACEP |
| Implementation Difficulty | 🟢 Easy | 🟡 Moderate |
| Administrative Cost | 🟡 Moderate | 🟢 Lower long-term |
| Inspection Flexibility | 🔴 Fixed Interval | 🟢 Flexible scheduling |
| Safety Coverage | 🟡 Intermittent | 🟢 Continuous |
| Suitable Owner Scale | Small / Medium | Large (>1,000 containers) |
4. Complete CSC Certification Process
4.1 New Container Certification Process
Container Manufacturing Complete
│
├── Apply for Design Approval (submit design drawings to an authorized body, e.g., CCS, Lloyd's)
│
├── Prototype Testing (stacking, lifting, racking, watertightness)
│
├── Manufacturing Inspection (sampling checks during production)
│
├── Approval Certificate Issued (CSC plate obtained)
│
├── CSC Plate Affixed to Container Door
│
└── Entered into International Transport Service
4.2 Existing Container Certification Process
Existing Container
│
├── Confirm Current Inspection Regime (PES or ACEP)
│
├── Check Examination Date Marked on CSC Plate
│ ├── Not Yet Due → Continue Use
│ └── Due or About to Be Due
│ ├── Contact Authorized Inspection Body
│ ├── Arrange Examination
│ │ ├── Pass → Update Examination Date on CSC Plate
│ │ └── Fail → Repair → Re-examination → Pass
│ └── Update Plate → Continue Use
└──
4.3 Inspection Cost Reference
| Inspection Item | Reference Cost | Notes |
| CSC Periodic Examination (PES) | ¥200–500 / container | Includes visual check + watertightness test + structural check |
| CSC Continuous Examination (ACEP) | ¥100–300 / container | Depends on examination frequency and owner's system |
| Plate Replacement | ¥100–200 / piece | Required if damaged or outdated |
| Repair + Re-examination | ¥500–5,000 / container | Depends on extent of damage |
5. Key Points of CSC Amendments at IMO MSC 109 (2025)
In May 2025, the IMO Maritime Safety Committee (MSC), at its 109th session, adopted the following amendments to the CSC Convention:
| Amendment | Old Provision | New Provision (2025) | Implementation Date |
| Examination Interval Adjustment | PES interval 30 months (for containers ≤15 years old) | Shortened to 12 months for containers >15 years old | January 2026 |
| ACEP Scope Expansion | Only for owned containers | Extended to leased containers (leasing companies can apply) | In effect |
| Digital Plates | Physical plates only | Electronic plates accepted as equivalent alternative | July 2026 |
| Remote Examination | Physical attendance required | Video remote examination accepted (for certain items) | In effect |
| Stacking Mark Update | Only max stacking weight marked | Stacking tier mark added (e.g., "STACK 4 HIGH") | January 2027 |
Impact Assessment: Inspection costs for aging containers (>15 years old) will increase significantly. Owners are advised to plan fleet renewal in advance.
6. Frequently Asked Questions
Q: My container's CSC examination is about to expire. Can I still use it for transport? A: No. Once the examination date marked on the CSC plate has passed, the container must not be used for international transport. It is recommended to schedule a re-examination 2–3 months in advance.
Q: Is ACEP suitable for small container owners? A: Generally not. The setup cost for ACEP is high (ISO 9001 system certification + examination procedure development). Owners with fewer than 500 containers are advised to continue using the PES system.
Q: What should I do if the CSC plate is lost? A: Apply for a replacement from the original approval body. You must provide the container number, a copy of the original approval certificate, and current photographs of the container. The cost is approximately ¥100–200, and the processing time is 5–10 working days.
Data Note: Convention provisions cited from the original text of the CSC Convention (IMO Publication IA574E) and amendments adopted at the 109th Session of the IMO MSC. Data current as of July 2026.
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