ISO 16923:2026

Overview

ISO 16923:2026 – Natural Gas Fuelling Stations - Compressed Natural Gas (CNG) Stations for Fuelling Vehicles is an international standard published by ISO, setting out comprehensive requirements for the design, construction, operation, maintenance, and inspection of compressed natural gas (CNG) fuelling stations for vehicles. The standard provides guidance for all equipment and control devices up to the fuelling nozzle, covering stations that use natural gas (as defined by local regulations or ISO 13686) and other compatible gases. It also encompasses CNG dispensed from liquefied natural gas (LCNG) per ISO 16924.

ISO 16923:2026 applies to various types of CNG fuelling stations, whether public or private, including slow fill, fast fill, stations with fixed or mobile storage, and multi-fuel operations. By following this standard, station operators, designers, and regulators can ensure safety, reliability, and consistency across CNG refuelling infrastructure.

Key Topics

ISO 16923:2026 covers all major aspects of CNG fuelling station infrastructure, focusing on the following areas:

• Station Types and Configurations: Includes requirements for slow fill, fast fill, private access, public access (self-service and assisted), fixed and mobile storage, and multi-fuel stations.
• Equipment Covered: Specifies standards for compressors, dryers, dispensers, storage vessels, pipework, electrical systems, gas detection, and control devices.
• Safety and Risk Management: Details hazard assessment, hazardous area classification, ignition prevention, emergency shutdown protocols, explosion protection, and separation distances.
• Operational Procedures: Provides best practices for safe fuelling operations, emergency response, signage, traceability, and documentation.
• Inspection and Maintenance: Outlines requirements for maintenance programs, inspection schedules, and testing of safety and control systems.
• Special Considerations: Includes provisions for stations supplied by pipeline or mobile storage, CNG derived from LCNG, and odorization requirements for leak detection.

Note: The standard is not applicable to vehicle-to-vehicle CNG transfer or vehicle refuelling appliances (VRA).

Applications

Implementing ISO 16923:2026 brings practical value to a range of stakeholders in the CNG automotive sector:

• Station Designers & Engineers: Ensure compliance with internationally recognized best practices for CNG station layout, equipment choice, and site safety.
• CNG Station Operators: Maintain high safety standards, improve operational efficiency, and streamline maintenance, reducing downtime and enhancing customer trust.
• Regulatory Authorities: Use the standard as a benchmark for permits, inspections, and audits, supporting consistent safety standards across regions.
• Fleet Owners: Benefit from predictable, safe, and efficient refuelling environments for commercial natural gas vehicle operations.
• Multi-fuel Stations: Integrate CNG fuelling alongside other fuels confidently, with guidelines on multi-fuel dispenser and station management.

Adhering to ISO 16923 promotes a robust safety culture, minimizes risks of gas leaks or explosions, and protects personnel and assets.

Related Standards

For comprehensive compliance and up-to-date infrastructure, consider the following related standards:

• ISO 13686: Natural gas – Quality designation
• ISO 16924: Natural gas fuelling stations – Liquefied natural gas (LNG) stations for fuelling vehicles
• ISO 11439: High pressure cylinders for on-board storage of natural gas
• ISO 15500 series: Road vehicles – CNG fuel system components
• ISO 2615:2024: Analysis of natural gas - Determination of compressor oil content
• ISO 12100: Safety of machinery – General principles for risk assessment
• IEC 60079 series: Standards for hazardous areas and explosive atmospheres

These standards provide additional technical detail on equipment, material compatibility, safety systems, and operational procedures critical for CNG fuelling station development and operation.

By leveraging ISO 16923:2026, natural gas vehicle infrastructure developers and operators can deliver safe, reliable, and efficient CNG fuelling solutions-supporting global sustainability and clean mobility objectives.