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CSA ANSI HGV 4.7-2013 (2018): Ensuring Safety in Hydrogen Fueling Station Hose and Dispenser Assemblies
A technical overview of the scope, key requirements, and compliance aspects for compressed hydrogen gas vehicle fueling infrastructure
CSA ANSI HGV 4.7-2013 (reaffirmed 2018) is a joint American National Standard developed by CSA Group and approved by ANSI. It establishes minimum safety and performance requirements for hose and dispenser assemblies intended for use in compressed hydrogen gas (CHG) vehicle fueling stations. As the hydrogen vehicle market expands, adherence to this standard is essential for ensuring safe, reliable, and interoperable fueling equipment. This article provides a technical overview of the standard’s scope, key requirements, testing protocols, and compliance considerations.
Scope and Application
CSA ANSI HGV 4.7-2013 (2018) applies to hose and dispenser assemblies that transfer compressed hydrogen gas from a station’s storage or compression system to a vehicle’s fuel receptacle. These assemblies include the hose, fittings, breakaway devices, and any coupling components used in the fueling process. The standard covers:
- Hose assemblies for service pressures up to 70 MPa (10,000 psi) at ambient temperatures ranging from -40°C to +85°C.
- Dispenser assemblies that incorporate the hose, nozzle, and any static-discharge or leakage prevention systems.
- Design, material selection, and manufacturing processes required to withstand the unique challenges of hydrogen service, such as hydrogen embrittlement and high-pressure cycling.
Tip: This standard complements other HGV series standards (e.g., HGV 4.3 for dispenser safety and HGV 4.6 for compressors). When designing a hydrogen fueling station, review the entire HGV 4 family for consistency.
Key Technical Requirements
Material Compatibility
Materials used in hose and dispenser assemblies must resist hydrogen permeation, embrittlement, and degradation. The standard requires that all wetted materials be tested for compatibility with gaseous hydrogen under expected operating conditions. Metallic components must be selected to avoid hydrogen-induced cracking (HIC) and stress corrosion cracking (SCC). Non-metallic sealing elements and hose liners must demonstrate low permeability and durability under cyclic pressure.
Design and Performance
The standard specifies minimum design safety factors, burst pressure requirements, and cycle life criteria. Table 1 summarizes the essential performance test parameters:
| Test Parameter | Requirement | Reference Clause |
|---|---|---|
| Minimum burst pressure | 4 × maximum working pressure (MWP) | 5.2.1 |
| Cyclic pressure test | 100,000 cycles at 0 to MWP at ambient, followed by 5,000 cycles at extreme temperature | 5.3.2 |
| Leak test (gas phase) | No detectable leakage at 1.5 × MWP using helium or hydrogen | 5.4 |
| Flex test | Bending radius and flexure cycles simulating worst-case installation | 5.5 |
| Electrical continuity | Resistance ≤ 1 MΩ between nozzle and station ground | 5.6 |
| Hydrostatic pressure test (type approval) | Proof pressure at 1.5 × MWP without permanent deformation | 5.7 |
Table 1 – Selected performance test requirements from CSA ANSI HGV 4.7-2013 (2018)
Safety Devices and Dispenser Requirements
Dispenser assemblies must include a breakaway device that disconnects without leaking hydrogen if the vehicle pulls away while still connected. The standard also mandates a thermal protection device (fuse) to prevent overpressure due to fire exposure. All dispenser components must be certified for use in hazardous (classified) locations per applicable electrical codes.
Warning: Incorrect breakaway installation or bypass can lead to catastrophic failures. Always follow manufacturer instructions and ensure the breakaway device is positioned according to the station layout.
Implementation and Compliance
Certification and Marking
Each hose and dispenser assembly shall bear permanent marking including the manufacturer’s name, maximum working pressure, temperature rating, standard reference, and serial number. Assemblies must be certified by a recognized independent testing organization (e.g., CSA, UL) as meeting the requirements of this standard.
Quality Assurance
Manufacturers are required to maintain a documented quality management system (e.g., ISO 9001) and perform routine production tests, including pneumatic leak tests and dimensional checks. Records must be kept for at least 10 years.
Periodic Inspection
The standard recommends that hose assemblies be inspected at least annually for wear, kinks, abrasion, and signs of hydrogen permeation (e.g., blistering). Any assembly that fails inspection must be removed from service immediately.
Success: Compliance with CSA ANSI HGV 4.7 is widely accepted by authorities having jurisdiction (AHJs) and is often a prerequisite for station permits and insurance coverage.
Danger: Use of non-compliant hose assemblies can result in catastrophic failures, leaks, and accidents. Never substitute components without verifying their compatibility and certification to this standard.
Integration with Other Standards
CSA ANSI HGV 4.7 is part of a comprehensive framework for hydrogen fueling stations. For dispenser safety, refer to HGV 4.3. For fueling protocols for light-duty vehicles, SAE J2601 and SAE J2799 provide complementary requirements. When designing for high flow rates or heavy-duty vehicles, additional standards such as ISO 19880-1 and ISO 17268 may apply. Harmonizing these requirements early in the design phase reduces compliance costs.
Q: Is CSA ANSI HGV 4.7-2013 (2018) mandatory for all hydrogen stations in the United States?
A: While not a federal law, many state and local codes (e.g., California’s Title 24) adopt it by reference. Most station installers and operators require compliance to meet insurance and permitting requirements.
A: While not a federal law, many state and local codes (e.g., California’s Title 24) adopt it by reference. Most station installers and operators require compliance to meet insurance and permitting requirements.
Q: Can hose assemblies built to an older version of the standard still be used?
A: Existing assemblies manufactured to the 2013 edition remain valid if they were certified at that time. However, any new production after the reaffirmation date should conform to the 2018 reaffirmation. Check with your certification body.
A: Existing assemblies manufactured to the 2013 edition remain valid if they were certified at that time. However, any new production after the reaffirmation date should conform to the 2018 reaffirmation. Check with your certification body.
Q: What is the difference between a type test and a routine (production) test?
A: Type tests (e.g., burst, cyclic, flex) are performed on a representative sample for design verification. Routine tests (e.g., leak test at 1.5× MWP) are conducted on every assembly before shipment.
A: Type tests (e.g., burst, cyclic, flex) are performed on a representative sample for design verification. Routine tests (e.g., leak test at 1.5× MWP) are conducted on every assembly before shipment.
Q: Are there any requirements for recertification after station modification?
A: The standard does not directly cover field modifications. However, any change that affects the hose or dispenser assembly performance (e.g., longer hose, different nozzle) should trigger a review by the manufacturer or a qualified engineer to ensure ongoing compliance.
A: The standard does not directly cover field modifications. However, any change that affects the hose or dispenser assembly performance (e.g., longer hose, different nozzle) should trigger a review by the manufacturer or a qualified engineer to ensure ongoing compliance.
This article provides a general technical overview. For complete requirements, refer to the official publication of CSA ANSI HGV 4.7-2013 (R2018). Always consult with accredited certification bodies and local authorities for specific compliance obligations.
© 2026 – This technical summary is for informational purposes only and does not replace the full standard.