Beyond Compliance: 7 Critical Insights from IMO MEPC.269(68) That Every Shipowner Should Know About IHMM

One of the most important messages conveyed by MEPC.269(68) is that an Inventory should evolve together with the vessel. Throughout a ship’s lifecycle, machinery is replaced, electrical systems are upgraded, coatings are renewed, accommodation spaces are refurbished and new equipment is installed. Each of these modifications has the potential to introduce new hazardous materials or remove existing ones.

The guideline recognises that these operational changes directly affect the hazardous material profile of the vessel. Therefore, maintaining an accurate Inventory requires periodic reviews whenever modifications, repairs or equipment replacements occur.

Treating the Inventory as a document that is only reviewed during surveys or prior to recycling can result in outdated information — creating unnecessary challenges during inspections, vessel sales, class surveys and eventual recycling.

One of the strongest themes within MEPC.269(68) is the importance of collecting reliable information from equipment manufacturers and suppliers. The guideline recommends obtaining Material Declarations (MDs) together with Supplier’s Declarations of Conformity (SDoCs) as primary sources of hazardous material information.

These documents support the document analysis process and reduce uncertainty when identifying hazardous substances contained in equipment and materials supplied to the vessel. They also minimise the need for extensive onboard inspections or sampling during future Inventory updates.

Every replacement pump, valve, cable, navigation system, insulation material, coating or electrical component installed onboard should ideally be accompanied by the appropriate supplier documentation. Without these records, determining hazardous material content becomes significantly more challenging over time.

Ships rarely remain unchanged throughout their operational life. Dry dockings, ballast water treatment system installations, exhaust gas cleaning systems, alternative fuel conversions, machinery replacements, electrical upgrades and accommodation refurbishments all introduce new materials onboard.

While these projects are often completed successfully from an engineering perspective, the associated hazardous material documentation is sometimes overlooked. As a result, the Inventory gradually becomes inconsistent with the vessel’s actual configuration.

MEPC.269(68) encourages shipowners to review the Inventory whenever modifications or equipment replacements occur, to determine whether hazardous material records require updating. By integrating Inventory reviews into retrofit planning, shipowners can avoid costly documentation gaps that often become apparent only during inspections or recycling preparations.

One of the most practical sections of MEPC.269(68) addresses situations where hazardous material content cannot be confirmed through available documentation. This is particularly common on older vessels, where historical records may be incomplete.

Rather than making assumptions, the guideline recommends a systematic approach. Shipowners should first assess available documentation before deciding whether additional visual inspections or sampling are required. Where sampling is impractical or disproportionately expensive, components may be classified as potentially containing hazardous materials, provided suitable technical justification is documented.

This pragmatic methodology allows compliance to be achieved while avoiding unnecessary dismantling of equipment solely for sampling purposes.

• Assess available documentation — start with what is already known
• Carry out visual inspection — where documentation is insufficient
• Apply targeted sampling — only where necessary and proportionate
• Use justified classification — with documented technical reasoning where sampling is impractical

Preparing an Inventory involves much more than identifying hazardous materials. MEPC.269(68) recommends maintaining structured checklists that record equipment locations, hazardous material types, supporting reference documents, quantity calculations, document analysis results and inspection findings.

Consistent documentation enables technical managers, surveyors and recycling facilities to understand exactly where hazardous materials are located and how conclusions were reached. Well-organised records also simplify future Inventory updates and significantly improve inspection efficiency.

Another important lesson from MEPC.269(68) is that hazardous material information does not originate onboard the vessel — it originates throughout the supply chain.

Equipment manufacturers, suppliers, procurement teams, shipyards, technical departments and vessel managers all contribute to the collection of information required for maintaining an accurate Inventory. A missing Material Declaration or Supplier’s Declaration of Conformity may appear insignificant during procurement, but can create considerable challenges years later when updating the Inventory or preparing for recycling.

Building a structured process for collecting supplier information ensures long-term documentation quality and reduces future compliance risks.

One of the most overlooked aspects of MEPC.269(68) is its structured five-step methodology for developing and maintaining an Inventory. The guideline recommends:

• Step 1 — Collect all available documentation
• Step 2 — Assess the information collected
• Step 3 — Plan a visual and sampling check
• Step 4 — Verify onboard where necessary
• Step 5 — Prepare or update the Inventory based on verified findings

Although these steps are presented for developing the Inventory, they also provide an effective framework for Inventory of Hazardous Materials Maintenance (IHMM) throughout the vessel’s operational life. By applying this methodology whenever significant modifications occur, shipowners can maintain an Inventory that accurately reflects the vessel while reducing future compliance efforts.

Applied consistently, the principles of MEPC.269(68) turn day-to-day IHM Maintenance into five clear, lasting benefits for every vessel in your fleet:

At Varuna Sentinels B.V., we believe that effective hazardous material management extends far beyond preparing an Inventory. Our Inventory of Hazardous Materials Maintenance (IHMM) services are built around the lifecycle principles outlined in IMO Resolution MEPC.269(68).

• Reviewing Material Declarations (MDs) and verifying Supplier’s Declarations of Conformity (SDoCs)
• Assessing technical documentation for hazardous material content
• Updating Inventories following retrofits, repairs and equipment replacements
• Ensuring hazardous material records remain accurate and audit-ready throughout the vessel’s operational life

By following the document collection, assessment, verification and Inventory updating methodology recommended in MEPC.269(68), we help shipowners strengthen compliance, simplify inspections and support safer, more sustainable ship recycling.

IMO Resolution MEPC.269(68) is far more than a guideline for preparing an Inventory of Hazardous Materials — it provides a practical methodology for managing hazardous material information throughout a vessel’s lifecycle.

The seven insights discussed above demonstrate that successful Inventory of Hazardous Materials Maintenance (IHMM) depends on continuous documentation, structured information collection, systematic assessment and proactive updates following every significant onboard modification.