Document ID: chunk:federal_register_of_legislation:F2023L01530:body:0:p15
Version: federal_register_of_legislation:F2023L01530
Segment Type: other
Provision Reference: 
Character Range: 43365–46570

clearly legible and indelible manner.
7.             Part III – Specifications of a vehicle fuel system incorporating the compressed hydrogen storage system
This part specifies requirements for the vehicle fuel system, which includes the compressed hydrogen storage system, piping, joints, and components in which hydrogen is present. The hydrogen storage system included in the vehicle fuel system shall be tested and type-approved in accordance with Part I of this Regulation and produced in conformity with the approved type.
         7.1. In-use fuel system requirements
         7.1.1. Fuelling receptacle
         7.1.1.1. A compressed hydrogen fuelling receptacle shall prevent reverse flow to the atmosphere. Test procedure is by visual inspection.
         7.1.1.2. Fuelling receptacle label: A label shall be affixed close to the fuelling receptacle; for instance inside a refilling hatch, showing the following information: fuel type (e.g. "CHG" for gaseous hydrogen), MFP, NWP, date of removal from service of containers.
         7.1.1.3. The fuelling receptacle shall be mounted on the vehicle to ensure positive locking of the fuelling nozzle. The receptacle shall be protected from tampering and the ingress of dirt and water (e.g. installed in a compartment which can be locked). Test procedure is by visual inspection.
         7.1.1.4. The fuelling receptacle shall not be mounted within the external energy absorbing elements of the vehicle (e.g. bumper) and shall not be installed in the passenger compartment, luggage compartment and other places where hydrogen gas could accumulate and where ventilation is not sufficient. Test procedure is by visual inspection.
         7.1.2. Over-pressure protection for the low pressure system (Annex 5, paragraph 6. test procedure)
         The hydrogen system downstream of a pressure regulator shall be protected against overpressure due to the possible failure of the pressure regulator. The set pressure of the overpressure protection device shall be lower than or equal to the maximum allowable working pressure for the appropriate section of the hydrogen system.
         7.1.3. Hydrogen discharge systems
         7.1.3.1. Pressure relief systems (Annex 5, paragraph 6. test procedure)
              (a) Storage system TPRDs. The outlet of the vent line, if present, for hydrogen gas discharge from TPRD(s) of the storage system shall be protected by a cap;
              (b) Storage system TPRDs. The hydrogen gas discharge from TPRD(s) of the storage system shall not be directed:
              (i) Into enclosed or semi-enclosed spaces;
              (ii) Into or towards any vehicle wheel housing;
              (iii) Towards hydrogen gas containers;
                  (iv) Forward from the vehicle, or horizontally (parallel to road) from the back or sides of the vehicle.
              (c) Other pressure relief devices (such as a burst disc) may be used outside the hydrogen storage system. The hydrogen gas discharge from other pressure relief devices shall not be directed:
                  (i) Towards exposed electrical terminals, exposed electrical switches or other ignition sources;
              (ii) Into or towards the