Overview - ISO 20519:2021 for LNG bunkering
ISO 20519:2021, “Ships and marine technology - Specification for bunkering of liquefied natural gas fuelled vessels,” specifies requirements for LNG bunkering transfer systems and equipment not covered by the IGC Code. It applies to LNG fuelled vessels in international and domestic service regardless of size and standardizes five core elements: hardware (liquid and vapour transfer systems), operational procedures, the LNG bunker delivery note, personnel training and qualifications, and facility requirements to meet applicable ISO standards and local codes. The document supports safe, consistent bunkering operations and complements the IMO IGF Code.
Key technical topics and requirements
- Transfer system design: Vessel, facility and bunker transfer equipment design requirements including integrity, support, insulation and identification of components.
- Transfer equipment specifics: Requirements for hoses (metallic, corrugated, composite), marine transfer arms, bunkering connections, dry-disconnect/connect couplings (DD/CC) and insulation flanges.
- Emergency systems: Emergency shutdown (ESD) and emergency release systems (ERS) design and functional requirements to minimise release during malfunctions.
- Operational procedures: Mooring, communications, pre-transfer checks, flow measurement (flowmeter conformity notification), and stepwise bunkering transfer procedures.
- Risk assessment & controlled zones: Methodology for conducting risk assessments, defining hazardous and safety zones and acceptable bunkering parameters.
- Maintenance and documentation: Maintenance manuals, records, checklists (normative annexes) and management system/quality assurance for equipment manufacturers and operators.
- Personnel training: Minimum training and qualification requirements for vessel crews and LNG providers, plus documentation of training and competency.
Practical applications - who uses ISO 20519
- Shipowners and operators implementing LNG fuel systems and procedures for safe bunkering.
- LNG providers and terminal operators responsible for delivering bunkers, producing the bunker delivery note and training staff.
- Port and facility managers ensuring onshore infrastructure meets standards and local codes.
- Equipment manufacturers (hoses, couplings, transfer arms, ESD/ERS systems) designing to ISO requirements.
- Classification societies, flag states and regulators referencing common safety criteria to harmonize inspections and approvals.
- Crew trainers and safety officers developing competency programs and documented procedures.
Related standards and interoperability
ISO 20519 references and complements other standards and codes such as:
Using ISO 20519 helps reduce operational risk, improve interoperability between suppliers and ships, and provides a consistent framework for safe LNG bunkering operations.
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