Overview
EN ISO 16903:2015 (ISO 16903:2015) is a CEN-adopted international standard that provides guidance on the characteristics of liquefied natural gas (LNG) and the cryogenic materials used across the LNG value chain. Intended as a reference for designers and operators of LNG facilities, the document covers LNG physical properties, safety considerations, and material selection factors that influence equipment and structural design.
Key Topics
The standard addresses technical subjects that directly affect design and materials choices for LNG facilities, including:
- General LNG characteristics: composition, density, temperature and viscosity considerations relevant to cryogenic design.
- Boil-off gas: generation during storage and handling and implications for containment and gas management.
- Physical hazard phenomena: spillage behaviour, expansion and dispersion of gas clouds, ignition potential, pool fires, pressure-wave development, and secondary events such as rollover, RPT and BLEVE.
- Containment and thermal effects: factors affecting cryogenic containment, thermal stresses and considerations for preventing brittle fracture and other low-temperature failures.
- Materials of construction:
- Materials for components in direct contact with LNG (cryogenic service).
- Materials for components not in direct contact during normal operation but exposed to low temperatures or vapour.
- Guidance on material selection principles and limitations for cryogenic service.
- Health and safety guidance: exposure to cold (frostbite, hypothermia, lung effects), exposure to gas (toxicity, asphyxia), protective clothing recommendations, fire precautions, and signage (colour/odour notes).
Applications and Who Uses It
EN ISO 16903:2015 is a practical reference for professionals working in the petroleum and natural gas industries, including:
- LNG plant and terminal designers and engineers (onshore and near‑shore installations)
- Materials engineers and procurement/specification teams selecting cryogenic steels, welds and insulation
- Safety, HSE and emergency response planners assessing hazards from spill, fire and vapour dispersion
- Asset operators and maintenance teams defining inspection and repair criteria for cryogenic components
- Regulators and compliance officers using the standard as a reference in codes and conformity assessments
Use cases include material selection for storage tanks and piping, fire and dispersion risk assessments, design validation of containment systems, and preparation of operational safety procedures.
Related Standards
- EN 1473 - Installation and equipment for liquefied natural gas: design of onshore installations
- NFPA 59A - Standard for the production, storage, and handling of liquefied natural gas (LNG)
- Note: EN ISO 16903:2015 supersedes EN 1160:1996 and is intended to support implementation of other LNG standards and codes.
Keywords: EN ISO 16903:2015, ISO 16903, LNG characteristics, cryogenic materials, material selection, LNG design, boil-off gas, LNG safety, BLEVE, thermal stresses.