Overview
EN ISO 20519:2022 (adoption of ISO 20519:2021) is a CEN-endorsed standard specifying requirements for the bunkering of liquefied natural gas (LNG) fuelled vessels. It covers LNG bunkering transfer systems and associated equipment where the IGC Code does not apply, and is intended for vessels in both international and domestic service regardless of size. The standard was approved by CEN in 2022 and supersedes EN ISO 20519:2017.
Key topics and technical requirements
EN ISO 20519:2022 addresses five core elements of LNG bunkering operations:
- Hardware: design and installation requirements for liquid and vapour transfer systems, hoses, corrugated metallic or composite assemblies, transfer arms, bunkering connections, dry-disconnect/connect couplings and insulation flanges.
- Operational procedures: approved mooring, communication, and bunkering transfer procedures, including acceptable bunkering parameters and contingency handling.
- Documentation: requirements for the LNG bunker delivery note from the LNG provider and associated records, checklists and maintenance manuals.
- Personnel training and qualifications: training, competency verification and record-keeping for vessel crews and personnel providing LNG from port or mobile facilities.
- Facility compliance: requirements for LNG facilities to meet applicable ISO standards and local codes.
Other technical topics included in the standard:
- Emergency shutdown (ESD) and emergency release systems (ERS) design and functional requirements.
- Risk assessments and controlled zones methodology and examples (informative annexes).
- Maintenance, identification and lifecycle management of transfer equipment.
- References to related standards, e.g., dry couplings meeting ISO 21593 (with grandfathering provisions) and flowmeter conformance information per ISO 21903.
Applications and practical value
This standard is practical guidance for:
- Designing, installing and validating LNG bunkering transfer systems at terminals, bunkering barges and ships.
- Developing safe, auditable bunkering procedures and emergency response plans.
- Preparing compliant bunker delivery notes, maintenance manuals, and training programs.
- Performing standardized risk assessments and establishing controlled zones during bunkering.
Using EN ISO 20519 helps reduce operational risk, supports regulatory compliance (including alignment with IMO IGF/IGC-related guidance), and enables interoperability between ports, suppliers and ships.
Who should use this standard
- Shipowners and ship operators of LNG-fuelled vessels
- Port and terminal operators, bunkering service providers, and LNG suppliers
- Naval architects, system designers and equipment manufacturers (hoses, couplings, transfer arms)
- Classification societies, port authorities and regulators
- Safety and training managers responsible for LNG bunkering operations
Related standards
- ISO 21593 (dry-connect/disconnect couplings)
- ISO 21903 (LNG flowmeter conformance)
- IMO IGF Code / IGC Code (context for gas-fuelled ship safety)
EN ISO 20519:2022 is a practical, industry-aligned reference for safe, standardized LNG bunkering operations and equipment management.