Design Considerations

  • Hydrogen dispensers should be listed or approved for operation.
  • Noncombustible construction should be used in the hydrogen dispensing area (within 15 feet of the dispenser).
  • Indoor refueling activities should be located in buildings with fire sprinklers and fire alarms.
  • Hydrogen production, compression, and storage equipment should be installed in a safe area outdoors, as this minimizes the potential for a large gas release inside the facility. Indoor installation guidance is provided in the applicable fire codes.
  • Dispensers should be installed in unconfined areas of large rooms having ceiling heights greater than 25 feet. Where this is not possible, a mechanical ventilation system should be installed in accordance with the applicable codes and standards.
  • The dispenser and hydrogen piping should be protected from vehicle impact.
  • The dispensing area should be equipped with a manually operated emergency stop button (ESB) located remotely from the dispenser, but within sight. The ESB should end the fueling process and isolate the hydrogen outside of the facility. A manual shutoff valve, as well as automatic shutoff valves with sufficient redundancy, should be provided.
  • For indoor dispensing, a shutoff means should be provided outside of the facility.
  • All vents from the dispenser should be piped outdoors to a safe location.
  • Consistent with the facility fire prevention plan, a portable fire extinguisher may be provided for the purpose of extinguishing a combustible material fire in the area of the dispenser.
  • The dispenser and hydrogen supply piping should be electrically bonded.
  • The dispenser should utilize a nozzle designed in accordance with SAE J2600 for the specific pressure rating of the hydrogen storage tank on the industrial truck. SAE J2600-designed nozzles are mechanically coded to connect only to vehicles that can be safely filled with the dispensing pressure. These nozzles have been extensively tested and approved, contain double-block-and-bleed features, and cannot be opened unless connected to an industrial truck.
  • The dispenser should have self-sealing break-away joints to minimize gas leakage in the event of an industrial truck pull-away incident. Break-away connections should be mechanically supported to ensure that a "drive-off" event will cause the break-away connection to release.
  • Where multiple types of vehicles and/or fuel tanks reside within a single facility, a means should be provided within the dispenser to ensure that they can all be safely filled. This may require a vehicle identification system to provide different fueling protocols as needed.