ISO 12619-11:2017

Overview

ISO 12619-11:2017 is an international standard that specifies the tests and requirements for excess flow valves used in fuel system components of road vehicles powered by compressed gaseous hydrogen (CGH2) and hydrogen/natural gas blends. This standard is part 11 of the ISO 12619 series and targets components intended for motor vehicles defined under ISO 3833, emphasizing safety and performance under operational conditions.

Excess flow valves are critical safety devices designed to limit or shut off hydrogen or hydrogen/natural gas blend flow in case of sudden leaks or damages to the fuel system. The standard applies specifically to vehicles using CGH2 as per ISO 14687-1 and ISO 14687-2, and hydrogen/natural gas blends using natural gas compliant with ISO 15403-1 and ISO/TR 15403-2.

Exclusions of ISO 12619-11:2017 include:

• Liquefied hydrogen (LH2) fuel system components
• Fuel containers and mounting hardware
• Stationary gas engines
• Electronic fuel management systems
• Refuelling receptacles
• Fuel cell vehicles

This focus ensures the standard addresses unique challenges and safety concerns related to gaseous hydrogen and blends in on-road vehicle applications only.

Key Topics

• Excess Flow Valve Types

  • Internal and External Valves: Placement inside or outside the cylinder valve.
  • Shut-off vs Flow-limiter: Shut-off valves stop flow upon activation with manual resetting; flow-limiters automatically limit flow when activated.

• Testing and Performance Requirements

  • Hydrostatic Strength Test: Validates valve housing integrity at 2.5 times working pressure.
  • Leakage Test: Ensures internal leak tightness at various temperatures and pressures.
  • Excess Torque Resistance & Bending Moment: Assesses mechanical robustness for external valves.
  • Continued Operation: Validates valve performance after repeated cycling.
  • Pressure Impulse Test: Confirms resistance to 100 cycles of instantaneous pressure pulses.
  • Operational Verification: Confirms activation flow rates meet manufacturer’s specifications.

• Marking and Traceability

  • Manufacturer’s name or trademark
  • Model designation and part number
  • Operating specifications: working pressure, temperature range, valve type, activation flow or differential pressure
  • Recommended markings include flow direction, fuel type, certification symbols, and ISO 12619-11:2017 reference.

Applications

ISO 12619-11:2017 is essential for manufacturers and suppliers of fuel system components in hydrogen vehicles, ensuring safety and reliability in these emerging clean energy technologies. The excess flow valves compliant with this standard help:

• Protect vehicle occupants and infrastructure by automatically controlling hydrogen flow in case of accidents or system failures.
• Enable safe integration of CGH2 and hydrogen/natural gas blends in road vehicles.
• Support adherence to stringent safety protocols required by automotive industries and regulatory agencies.
• Facilitate innovation in hydrogen fuel vehicle design by providing validated performance and safety parameters.

This standard is valuable for automotive OEMs, component manufacturers, testing laboratories, and regulators working to advance hydrogen fuel systems on roads globally.

Related Standards

• ISO 3833: Defines vehicle types and terms relevant to this standard.
• ISO 12619-1 & ISO 12619-2: General requirements and test methods for CGH2 and hydrogen/natural gas blend fuel system components.
• ISO 14687-1 & ISO 14687-2: Hydrogen fuel specifications for general and fuel cell PEM applications.
• ISO 15403-1 & ISO/TR 15403-2: Specifications for natural gas used as compressed fuel.
• ISO/TS 15869: Specifications for gaseous hydrogen and blends land vehicle fuel tanks.
• ISO/TR 15916: Safety considerations for hydrogen systems used in various applications.

Adhering to this comprehensive network of standards ensures consistent quality, interoperability, and safety across hydrogen fuel vehicle components.

Keywords: ISO 12619-11, excess flow valve, compressed gaseous hydrogen, hydrogen/natural gas blends, CGH2 fuel system, hydrogen vehicle safety, automotive hydrogen components, fuel system testing, hydrogen fuel standards, road vehicle hydrogen systems