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CSA ANSI HGV 2-2014 (2019): Standard for Compressed Hydrogen Gas Vehicle Fueling Connectors
Technical Requirements, Safety Considerations, and Compliance for HGV Fueling Connectors
Scope of CSA ANSI HGV 2-2014 (2019)
CSA ANSI HGV 2-2014 (2019) is a joint American National Standard developed by CSA Group and approved by ANSI. It establishes the minimum design, performance, and safety requirements for fueling connectors specifically intended for compressed hydrogen gas vehicles (HGVs). The standard covers both the vehicle-side receptacle and the station-side nozzle, including all sealing, locking, and breakaway mechanisms.
The scope of HGV 2 includes connectors for service pressures up to 70 MPa (10,000 psi) and operating temperatures from –40°C to 85°C. It applies to connectors used at commercial hydrogen fueling stations, fleet depots, and other locations where compressed hydrogen is dispensed into vehicles. The standard is harmonized with the fueling interface specifications of SAE J2600 and ISO 17268, but includes additional North American–specific requirements for safety and interoperability.
Tip: When designing a system around CSA ANSI HGV 2-2014 (2019), always verify the connector configuration class (e.g., H35, H70) matches the vehicle’s service pressure to avoid incompatible connections.
Technical Requirements and Specifications
Table 1 summarizes the key technical parameters that fueling connectors must satisfy under CSA ANSI HGV 2-2014 (2019).
| Parameter | Requirement | Test Method |
|---|---|---|
| Rated working pressure | 35 MPa or 70 MPa | Hydrostatic proof test at 1.5× rated pressure |
| Operating temperature range | –40°C to +85°C | Thermal cycling endurance |
| Burst pressure | ≥ 2.25 × rated working pressure | Hydrostatic burst test |
| Maximum allowable leakage | ≤ 0.15 cm³/h (external) / ≤ 0.05 cm³/h (internal) at rated pressure | Leak test with hydrogen or helium |
| Cycle life | ≥ 10,000 complete connect/disconnect cycles | Endurance cycle test at rated flow and pressure |
| Breakaway pull force | Between 150 N and 400 N | Breakaway mechanism test |
Materials used in connector construction must be compatible with hydrogen gas to prevent embrittlement, stress cracking, or degradation. All metallic components are required to pass a hydrogen embrittlement test per ASTM F1624 or equivalent. Non-metallic materials (seals, O-rings) must be tested for permeability and swelling in high-pressure hydrogen environments.
Connector dimensions and interface geometry are strictly defined to guarantee interchangeability. The standard specifies two pressure classes—H35 (35 MPa) and H70 (70 MPa)—each with distinct keying and color coding. Wired communication protocols (e.g., H2 Communication Profile per SAE J2799) are also mandated for data transfer during fueling.
Warning: Use of connectors that do not meet the cycle life requirement can lead to premature seal wear and hydrogen leaks. Always validate the manufacturer’s cycle test report.
Safety and Implementation Highlights
CSA ANSI HGV 2-2014 (2019) places great emphasis on operational safety through passive and active mechanisms:
- Automatic shutoff: The nozzle must incorporate a pressure-sensitive poppet that stops gas flow if the connection is not fully engaged.
- Breakaway feature: A designed weak point in the nozzle prevents damage to the station hose or vehicle receptacle during drive-away events. The breakaway must activate at a pull force between 150 N and 400 N and seal both sides immediately upon separation.
- Grounding and static discharge: Connectors must include a metallic grounding path to dissipate electrostatic charge before and during fueling.
- Thermal management: The standard requires that the connector materials withstand rapid temperature changes caused by the Joule–Thomson cooling of hydrogen gas during dispensing.
All connectors must be subjected to type testing by a certified laboratory, including hydrostatic pressure tests, burst tests, leak tests at extremes of temperature, and a cyclic endurance test that simulates 10,000 fueling events. The connector’s marking must clearly indicate the pressure class, manufacturer, date of manufacture, and standard reference.
Success: Stations that implement fully HGV 2–compliant connectors significantly reduce the risk of unplanned hydrogen releases, achieving a higher safety record and smoother approval from local code authorities.
Compliance and Certification Notes
Conformity to CSA ANSI HGV 2-2014 (2019) is verified through third-party testing and certification by a nationally recognized testing laboratory (NRTL) such as CSA Group or UL. The standard is referenced by the National Fire Protection Association (NFPA) 2, Hydrogen Technologies Code, and many state and provincial regulations.
Key compliance obligations for manufacturers include:
- Maintaining a quality control system that covers all critical components (seals, springs, retainer rings).
- Submitting representative samples for initial type testing and periodic retesting at least every five years.
- Providing user instructions and installation drawings with each connector unit.
- Ensuring traceability of materials by obtaining certificates of conformance from raw metal and polymer suppliers.
Facility operators should verify that any new hydrogen dispensing equipment carries a valid HGV 2 listing mark. Routine field inspections should check for signs of wear, seal degradation, and the correct operation of the breakaway mechanism.
Critical: Do not substitute HGV 2 connectors with non-certified or generic high-pressure connectors. Hydrogen embrittlement and leakage risks are extremely high without proper materials and testing.
Since 2014, the standard has been reaffirmed twice (2019) with minor editorial clarifications and updated references to related standards. The next revision is expected to incorporate lessons from real‑world fueling incidents and advances in composite material sealing technologies.
Q: What is the main purpose of CSA ANSI HGV 2-2014 (2019)?
A: It defines safety and performance requirements for fueling connectors used for compressed hydrogen gas vehicles to ensure safe, reliable, and interchangeable connections at hydrogen fueling stations.
A: It defines safety and performance requirements for fueling connectors used for compressed hydrogen gas vehicles to ensure safe, reliable, and interchangeable connections at hydrogen fueling stations.
Q: What are the key differences between HGV 2 and earlier versions?
A: HGV 2 introduced more stringent leak testing criteria (both external and internal), extended cycle life demands (10,000 cycles), and distinct interface dimensions for each pressure class (H35 and H70), which were not clearly delineated in predecessor standards.
A: HGV 2 introduced more stringent leak testing criteria (both external and internal), extended cycle life demands (10,000 cycles), and distinct interface dimensions for each pressure class (H35 and H70), which were not clearly delineated in predecessor standards.
Q: How does HGV 2 relate to international standards like ISO 17268?
A: HGV 2 is harmonized with ISO 17268 for basic connector geometry and test methods but includes additional North American requirements such as specific breakaway force ranges, communication protocol details (SAE J2799), and listing by a US/Canadian NRTL.
A: HGV 2 is harmonized with ISO 17268 for basic connector geometry and test methods but includes additional North American requirements such as specific breakaway force ranges, communication protocol details (SAE J2799), and listing by a US/Canadian NRTL.
Q: Is compliance with HGV 2 mandatory for all hydrogen stations?
A: While not a federal mandate in every jurisdiction, compliance is often required by local building and fire codes (e.g., NFPA 2) and by most station developers as a condition for equipment procurement. Many insurance carriers also stipulate HGV 2 certification.
A: While not a federal mandate in every jurisdiction, compliance is often required by local building and fire codes (e.g., NFPA 2) and by most station developers as a condition for equipment procurement. Many insurance carriers also stipulate HGV 2 certification.
Review and reaffirmation date: 2019 (reaffirmed).
© 2026 CSA Group. This article is for informational purposes only and does not substitute the official standard text.