Only the original UN/ECE texts have legal effect under international public law. The status and date of entry into force of this Regulation should be checked in the latest version of the UN/ECE status document TRANS/WP.29/343, available at:

http://www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29fdocstts.html

Regulation No 134 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of motor vehicles and their components with regard to the safety-related performance of hydrogen-fuelled vehicles (HFCV) [2019/795]

Incorporating all valid text up to:

Supplement 3 to the original version of the Regulation — Date of entry into force: 19 July 2018

CONTENTS

REGULATION

1. Scope

2. Definitions

3. Application for approval

4. Approval

5. Part I — Specifications of the compressed hydrogen storage system

6. Part II — Specifications of specific components for the compressed hydrogen storage system

7. Part III — Specifications of a vehicle fuel system incorporating the compressed hydrogen storage system

8. Modification of type and extension of approval

9. Conformity of production

10. Penalties for non-conformity of production

11. Production definitively discontinued

12. Names and addresses of Technical Services responsible for conducting approval tests and of the Type Approval Authorities

ANNEXES

1 Part 1 Model I — Information document No … on the type approval of a hydrogen storage system with regard to the safety-related performance of hydrogen-fuelled vehicles Model II — Information document No … on the type approval of specific component for a hydrogen storage system with regard to the safety-related performance of hydrogen-fuelled vehicles Model III — Information document No … on the type approval of a vehicle with regard to the safety-related performance of hydrogen-fuelled vehicles

Part 2 Model I — Communication concerning the approval or extension or refusal or withdrawal of approval or production definitively discontinued of a type of compressed hydrogen storage system with regard to the safety-related performance of hydrogen-fuelled vehicles pursuant to Regulation No 134 Model II — Communication concerning the approval or extension or refusal or withdrawal of approval or production definitively discontinued of a type of specific component (TPRD/Check valve/Automatic shut-off valve) with regard to the safety-related performance of hydrogen-fuelled vehicles pursuant to Regulation No 134 Model III — Communication concerning the approval or extension or refusal or withdrawal of approval or production definitively discontinued of a type of vehicle with regard to the safety-related performance of hydrogen-fuelled vehicles pursuant to Regulation No 134

2 Arrangements of the approval marks

3 Test procedures for the compressed hydrogen storage system

4 Test procedures for specific components for the compressed hydrogen storage system

Appendix 1 — Overview of TPRD tests

Appendix 2 — Overview of check valve and automatic shut-off valve tests

5 Test procedures for vehicle fuel system incorporating the compressed hydrogen storage system

1. SCOPE

This Regulation applies to (1):

1.1. Part I — Compressed hydrogen storage systems for hydrogen-fuelled vehicles on their safety-related performance.

1.2. Part II — Specific components for compressed hydrogen storage systems for hydrogenfuelled vehicles on their safety-related performance.

1.3. Part III — Hydrogenfuelled vehicles of category M and N (2) incorporating compressed hydrogen storage system on its safety-related performance.

2. DEFINITIONS

For the purpose of this Regulation, the following definitions shall apply:

2.1. ‘Burst disc’ means the non-reclosing operating part of a pressure relief device which, when installed in the device, is designed to burst at a predetermined pressure to permit the discharge of compressed hydrogen.

2.2. ‘Check valve’ means a non-return valve that prevents reverse flow in the vehicle fuel line.

2.3. ‘Compressed hydrogen storage system (CHSS)’ means a system designed to store hydrogen fuel for a hydrogen-fuelled vehicle and composed of a pressurised container, pressure relief devices (PRDs) and shut off device(s) that isolate the stored hydrogen from the remainder of the fuel system and its environment.

2.4. ‘Container’ (for hydrogen storage) means the component within the hydrogen storage system that stores the primary volume of hydrogen fuel.

2.5. ‘Date of removal from service’ means the date (month and year) specified for removal from service.

2.6. ‘Date of manufacture’ (of a compressed hydrogen container) means the date (month and year) of the proof pressure test carried out during manufacture.

2.7. ‘Enclosed or semi-enclosed spaces’ means the special volumes within the vehicle (or the vehicle outline across openings) that are external to the hydrogen system (storage system, fuel cell system and fuel flow management system) and its housings (if any) where hydrogen may accumulate (and thereby pose a hazard), as it may occur in the passenger compartment, luggage compartment and space under the hood.

2.8. ‘Exhaust point of discharge’ means the geometric centre of the area where fuel cell purged gas is discharged from the vehicle.

2.9. ‘Fuel cell system’ means a system containing the fuel cell stack(s), air processing system, fuel flow control system, exhaust system, thermal management system and water management system.

2.10. ‘Fuelling receptacle’ means the equipment to which a fuelling station nozzle attaches to the vehicle and through which fuel is transferred to the vehicle. The fuelling receptacle is used as an alternative to a fuelling port.

2.11. ‘Hydrogen concentration’ means the percentage of the hydrogen moles (or molecules) within the mixture of hydrogen and air (equivalent to the partial volume of hydrogen gas).

2.12. ‘Hydrogen-fuelled vehicle’ means any motor vehicle that uses compressed gaseous hydrogen as a fuel to propel the vehicle, including fuel cell and internal combustion engine vehicles. Hydrogen fuel for passenger vehicles is specified in ISO 14687-2: 2012 and SAE J2719: (September 2011 Revision).

2.13. ‘Luggage compartment’ means the space in the vehicle for luggage and/or goods accommodation, bounded by the roof, hood, floor, side walls, being separated from the passenger compartment by the front bulkhead or the rear bulkhead.

2.14. ‘Manufacturer’ means the person or body responsible to the approval authority for all aspects of the type approval process and for ensuring conformity of production. It is not essential that the person or body is directly involved in all stages of the construction of the vehicle, system or component which is the subject of the approval process.

2.15. ‘Maximum allowable working pressure (MAWP)’ means the highest gauge pressure to which a pressure container or storage system is permitted to operate under normal operating conditions.

2.16. ‘Maximum fuelling pressure (MFP)’ means the maximum pressure applied to compressed system during fuelling. The maximum fuelling pressure is 125 per cent of the Nominal Working Pressure.

2.17. ‘Nominal working pressure (NWP)’ means the gauge pressure that characterises typical operation of a system. For compressed hydrogen gas containers, NWP is the settled pressure of compressed gas in fully fuelled container or storage system at a uniform temperature of 15 °C.

2.18. ‘Pressure relief device (PRD)’ means a device that, when activated under specified performance conditions, is used to release hydrogen from a pressurised system and thereby prevent failure of the system.

2.19. ‘Rupture’ or ‘burst’ both mean to come apart suddenly and violently, break open or fly into pieces due to the force of internal pressure.

2.20. ‘Safety relief valve’ means a pressure relief device that opens at a preset pressure level and can re-close.

2.21. ‘Service life’ (of a compressed hydrogen container) means the time frame during which service (usage) is authorised.

2.22. ‘Shut-off valve’ means a valve between the storage container and the vehicle fuel system that can be automatically activated; which defaults to the ‘closed’ position when not connected to a power source.

2.23. ‘Single failure’ means a failure caused by a single event, including any consequential failures resulting from this failure.

2.24. ‘Thermally-activated pressure relief device (TPRD)’ means a non- reclosing PRD that is activated by temperature to open and release hydrogen gas.

2.25. ‘Type of hydrogen storage system’ means an assembly of components which do not differ significantly in such essential aspects as: (a) The manufacturer's trade name or mark; (b) The state of stored hydrogen fuel; compressed gas; (c) The nominal working pressure (NWP); (d) The structure, materials, capacity and physical dimensions of the container; and (e) The structure, materials and essential characteristics of TPRD, check valve and shut-off valve, if any.

2.26. ‘Type of specific components of hydrogen storage system’ means a component or an assembly of components which do not differ significantly in such essential aspects as: (a) The manufacturer's trade name or mark; (b) The state of stored hydrogen fuel; compressed gas; (c) The sort of component: (T)PRD, check-valve or shut-off valve; and (d) The structure, materials and essential characteristics.

2.27. ‘Vehicle type’ with regard to hydrogen safety means vehicles which do not differ in such essential aspects as: (a) The manufacturer's trade name or mark; and (b) The basic configuration and main characteristics of the vehicle fuel system.

2.28. ‘Vehicle fuel system’ means an assembly of components used to store or supply hydrogen fuel to a fuel cell (FC) or internal combustion engine (ICE).

3. APPLICATION FOR APPROVAL

3.1. Part I: Application for approval of a type of the compressed hydrogen storage system.

3.1.1. The application for approval of a type of hydrogen storage system shall be submitted by the manufacturer of the hydrogen storage system or by their authorised representative.

3.1.2. A model of information document is shown in Annex 1, Part 1-I.

3.1.3. A sufficient number of hydrogen storage systems representatives of the type to be approved shall be submitted to the Technical Service conducting the approval tests.

3.2. Part II: Application for approval of a type of specific component for compressed hydrogen storage system.

3.2.1. The application for approval of a type of specific component shall be submitted by the manufacturer of the specific component or by their authorised representative.

3.2.2. A model of information document is shown in Annex 1, Part 1-II.

3.2.3. A sufficient number of specific components of hydrogen storage system representatives of the type to be approved shall be submitted to the Technical Service conducting the approval tests.

3.3. Part III: Application for approval of a vehicle type.

3.3.1. The application for approval of a vehicle type shall be submitted by the vehicle manufacturer or by their authorised representative.

3.3.2. A model of information document is shown in Annex 1, Part 1- III.

3.3.3. A sufficient number of vehicles representatives of the type to be approved shall be submitted to the Technical Service conducting the approval tests.

4. APPROVAL

4.1. Granting of type approval.

4.1.1. Approval of a type of compressed hydrogen storage system.

If the hydrogen storage system submitted for approval pursuant to this Regulation meets the requirements of Part I below, approval of that type of hydrogen storage system shall be granted.

4.1.2. Approval of a type of specific component for the compressed hydrogen storage system.

If the specific component submitted for approval pursuant to this Regulation meets the requirements of Part II below, approval of that type of specific component shall be granted.

4.1.3. Approval of a vehicle type.

If the vehicle submitted for approval pursuant to this Regulation meets the requirements of Part III below, approval of that vehicle type shall be granted.

4.2. An approval number shall be assigned to each type approved: its first two digits (00 for the Regulation in its initial form) shall indicate the series of amendments incorporating the most recent major technical amendments made to the Regulation at the time of issue of the approval. The same Contracting Party shall not assign the same number to another vehicle or component type.

4.3. Notice of approval or of extension, refusal or withdrawal of approval pursuant to this Regulation shall be communicated to the Contracting Parties to the Agreement which apply this Regulation by means of a form conforming to the model in Annex 1, Part 2 and photographs and/or plans supplied by the applicant being in a format not exceeding A4 (210 × 297 mm), or folded to that format, and on an appropriate scale.

4.4. There shall be affixed, conspicuously and in a readily accessible place specified on the approval form, to every vehicle, hydrogen storage system or specific component conforming to a type approved under this Regulation, an international approval mark conforming to the models described in Annex 2, consisting of:

4.4.1. a circle surrounding the letter ‘E’ followed by the distinguishing number of the country which has granted approval (3);

4.4.2. the number of this Regulation, followed by the letter ‘R’, a dash and the approval number to the right of the circle prescribed in paragraph 4.4.1.

4.5. If the vehicle conforms to a vehicle type approved under one or more other Regulations, annexed to the Agreement, in the country which has granted approval under this Regulation, the symbol prescribed in paragraph 4.4.1 needs not be repeated; in such a case, the Regulation and approval numbers and the additional symbols shall be placed in vertical columns to the right of the symbol prescribed in paragraph 4.4.1 above.

4.6. The approval mark shall be clearly legible and be indelible.

4.6.1. In the case of a vehicle, the approval mark shall be placed close to or on the vehicle data plate.

4.6.2. In the case of a hydrogen storage system, the approval mark shall be placed on the container.

4.6.3. In the case of a specific component, the approval mark shall be placed on the specific component.

5. PART I — SPECIFICATIONS OF THE COMPRESSED HYDROGEN STORAGE SYSTEM

This part specifies the requirements for the compressed hydrogen storage system. The hydrogen storage system consists of the high pressure storage container and primary closure devices for openings into the high pressure storage container. Figure 1 shows a typical compressed hydrogen storage system consisting of a pressurised container, three closure devices and their fittings. The closure devices shall include the following functions, which may be combined:

(a) TPRD;

(b) Check valve that prevents reverse flow to the fill line; and

(c) Automatic shut-off valve that can close to prevent flow from the container to the fuel cell or internal combustion engine. Any shut-off valve, and TPRD that form the primary closure of flow from the storage container shall be mounted directly on or within each container. At least one component with a check valve function shall be mounted directly on or within each container.

Figure 1

Typical compressed hydrogen storage system

Storage container

Shut-off valve

Check valve

vent

TPRD

All new compressed hydrogen storage systems produced for on-road vehicle service shall have a NWP of 70 MPa or less and a service life of 15 years or less, and be capable of satisfying the requirements of paragraph 5.

The hydrogen storage system shall meet the performance test requirements specified in this paragraph. The qualification requirements for on-road service are:

5.1. Verification tests for baseline metrics

5.2. Verification test for performance durability (hydraulic sequential tests)

5.3. Verification test for expected on-road system performance (pneumatic sequential tests)

5.4. Verification test for service terminating system performance in Fire

5.5. Verification test for performance durability of primary closures.

The test elements within these performance requirements are summarised in the table below. The corresponding test procedures are specified in Annex 3.

Overview of performance requirements

5.1. Verification tests for baseline metrics 5.1.1. Baseline initial burst pressure 5.1.2. Baseline initial pressure cycle life 5.2. Verification test for performance durability (sequential hydraulic tests) 5.2.1. Proof pressure test 5.2.2. Drop (impact) test 5.2.3. Surface damage 5.2.4. Chemical exposure and ambient temperature pressure cycling tests 5.2.5. High temperature static pressure test 5.2.6. Extreme temperature pressure cycling 5.2.7. Residual proof pressure test 5.2.8. Residual strength burst test 5.3. Verification test for expected on-road performance (sequential pneumatic tests) 5.3.1. Proof pressure test 5.3.2. Ambient and extreme temperature gas pressure cycling test (pneumatic) 5.3.3. Extreme temperature static gas pressure leak/permeation test (pneumatic) 5.3.4. Residual proof pressure test 5.3.5. Residual strength burst test (hydraulic) 5.4. Verification test for service terminating performance in fire 5.5. Requirements for primary closure devices

5.1. Verification tests for baseline metrics

5.1.1. Baseline initial burst pressure

Three (3) containers shall be hydraulically pressurised until burst (Annex 3, paragraph 2.1 test procedure). The manufacturer shall supply documentation (measurements and statistical analyses) that establish the midpoint burst pressure of new storage containers, BPO.

All containers tested shall have a burst pressure within ± 10 per cent of BPO and greater than or equal to a minimum BPmin of 225 per cent NWP.

In addition, containers having glass-fibre composite as a primary constituent to have a minimum burst pressure greater than 350 per cent NWP.

5.1.2. Baseline initial pressure cycle life

Three (3) containers shall be hydraulically pressure cycled at the ambient temperature of 20 (± 5) °C to 125 per cent NWP (+ 2/– 0 MPa) without rupture for 22 000 cycles or until a leak occurs (Annex 3, paragraph 2.2 test procedure). Leakage shall not occur within 11 000 cycles for a 15-year service life.

5.2. Verification tests for performance durability (Hydraulic sequential tests)

If all three pressure cycle life measurements made in paragraph 5.1.2 are greater than 11 000 cycles, or if they are all within ± 25 per cent of each other, then only one (1) container is tested in paragraph 5.2. Otherwise, three (3) containers are tested in paragraph 5.2.

A hydrogen storage container shall not leak during the following sequence of tests, which are applied in series to a single system and which are illustrated in Figure 2. Specifics of applicable test procedures for the hydrogen storage system are provided in Annex 3, paragraph 3.

Figure 2

Verification test for performance durability (hydraulic)

20 % #Cycles

+ 85 °C, 95 RH

20 % #Cycles

– 40 °C

1 000 hr

+85 °C

10 cycles

15 °C – 25 °C

60 % #Cycles

15 °C – 25 °C

48 hr

Damage

Drop

Proof Pressure

Chemicals

chemical exposure

Residual Strength

time

80 % NWP

125 % NWP

150 % NWP

180 % NWP (4 min)

burst

< 20 %

Pressure

BPO

5.2.1. Proof pressure test

A storage container is pressurised to 150 per cent NWP (+ 2/– 0 MPa) and held for at least 30 sec (Annex 3, paragraph 3.1 test procedure).

5.2.2. Drop (impact) test

The storage container is dropped at several impact angles (Annex 3, paragraph 3.2 test procedure).

5.2.3. Surface damage test

The storage container is subjected to surface damage (Annex 3, paragraph 3.3 test procedure).

5.2.4. Chemical exposure and ambient-temperature pressure cycling test

The storage container is exposed to chemicals found in the on-road environment and pressure cycled to 125 per cent NWP (+ 2/– 0 MPa) at 20 (± 5) °C for 60 per cent number of Cycles pressure cycles (Annex 3, paragraph 3.4 test procedure). Chemical exposure is discontinued before the last 10 cycles, which are conducted to 150 per cent NWP (+ 2/– 0 MPa).

5.2.5. High temperature static pressure test.

The storage container is pressurised to 125 per cent NWP (+ 2/– 0 MPa) at ≥ 85 °C for at least 1 000 hours (Annex 3, paragraph 3.5 test procedure).

5.2.6. Extreme temperature pressure cycling.

The storage container is pressure cycled at ≤ – 40 °C to 80 per cent NWP (+ 2/– 0 MPa) for 20 per cent number of Cycles and at ≥ + 85 °C and 95 (± 2) per cent relative humidity to 125 per cent NWP (+ 2/– 0 MPa) for 20 per cent number of Cycles (Annex 3, paragraph 2.2 test procedure).

5.2.7. Hydraulic residual pressure test. The storage container is pressurised to 180 per cent NWP (+ 2/– 0 MPa) and held at least 4 minutes without burst (Annex 3, paragraph 3.1 test procedure).

5.2.8. Residual strength burst test

The storage container undergoes a hydraulic burst test to verify that the burst pressure is at least 80 per cent of the baseline initial burst pressure (BPO) determined in paragraph 5.1.1 (Annex 3, paragraph 2.1 test procedure).

5.3. Verification test for expected on-road performance (Pneumatic sequential tests)

A hydrogen storage system shall not leak during the following sequence of tests, which are illustrated in Figure 3. Specifics of applicable test procedures for the hydrogen storage system are provided in Annex 3.

Figure 3

Verification test for expected on-road performance (pneumatic/hydraulic)

(a) Fuel/defuel cycles @ – 40 °C with initial system equilibration @ – 40 °C, 5 cycles with + 20 °C fuel; 5 cycles with < – 35 °C fuel

(b) Fuel/defuel cycles @ + 50 °C with initial system equilibration @ + 50 °C, 5 cycles with < – 35 °C fuel

(c) Fuel/defuel cycles @ 15 – 25 °C with service (maintenance) defuel rate, 50 cycles

5 % cy + 50 °C

5 % cy – 40 °C

40 % cy 15-25 °C

Leak / Permeation ≥ 30 hrs

Leak / Permeation ≥ 30 hrs

5 % cy – 40 °C (a)

5 % cy + 50 °C (b)

40 % cy 15-25 °C (c)

Proof Pressure

150 % NWP

time

80 % NWP

115 % NWP

125 % NWP

180 % NWP (4 min)

Burst

Pressure

BPO

< 20 %

5.3.1. Proof pressure test

A system is pressurised to 150 per cent NWP (+ 2/– 0 MPa) for at least 30 seconds (Annex 3, paragraph 3.1 test procedure). A storage container that has undergone a proof pressure test in manufacture may be exempted from this test.

5.3.2. Ambient and extreme temperature gas pressure cycling test

The system is pressure cycled using hydrogen gas for 500 cycles (Annex 3, paragraph 4.1 test procedure).

(a) The pressure cycles are divided into two groups: Half of the cycles (250) are performed before exposure to static pressure (paragraph 5.3.3) and the remaining half of the cycles (250) are performed after the initial exposure to static pressure (paragraph 5.3.3) as illustrated in Figure 3;

(b) The first group of pressure cycling, 25 cycles are performed to 80 per cent NWP (+ 2/– 0 MPa) at ≤ – 40 °C, then 25 cycles to 125 per cent NWP (+ 2/– 0 MPa) at ≥ + 50 °C and 95 (± 2) per cent relative humidity, and the remaining 200 cycles to 125 per cent NWP (+ 2/– 0 MPa) at 20 (± 5) °C; The second group of pressure cycling, 25 cycles are performed to 125 per cent NWP (+ 2/– 0 MPa) at ≥ + 50 °C and 95 (± 2) per cent relative humidity, then 25 cycles to 80 per cent NWP (+ 2/– 0 MPa) at ≤ – 40 °C, and the remaining 200 cycles to 125 per cent NWP (+ 2/– 0 MPa) at 20 (± 5) °C.

(c) The hydrogen gas fuel temperature is ≤ – 40 °C;

(d) During the first group of 250 pressure cycles, five cycles are performed with fuel having a temperature of + 20 (± 5) °C after temperature equilibration of the system at ≤ – 40 °C; five cycles are performed with fuel having a temperature of ≤ – 40 °C; and five cycles are performed with fuel having a temperature of ≤ – 40 °C after temperature equilibration of the system at ≥ + 50 °C and 95 per cent relative humidity;

(e) Fifty pressure cycles are performed using a de-fuelling rate greater than or equal to the maintenance de-fuelling rate.

5.3.3. Extreme temperature static pressure leak/permeation test.

(a) The test is performed after each group of 250 pneumatic pressure cycles in paragraph 5.3.2;

(b) The maximum allowable hydrogen discharge from the compressed hydrogen storage system is 46 ml/hr/l water capacity of the storage system. (Annex 3, paragraph 4.2 test procedure);

(c) If the measured permeation rate is greater than 0,005 mg/sec (3,6 Nml/min), a localised leak test is performed to ensure no point of localised external leakage is greater than 0,005 mg/sec (3,6 Nml/min) (Annex 3, paragraph 4.3 test procedure).

5.3.4. Residual proof pressure test (hydraulic)

The storage container is pressurised to 180 per cent NWP (+ 2/– 0 MPa) and held at least 4 minutes without burst (Annex 3, paragraph 3.1 test procedure).

5.3.5. Residual strength burst test (hydraulic)

The storage container undergoes a hydraulic burst to verify that the burst pressure is at least 80 per cent of the baseline initial burst pressure (BPO) determined in paragraph 5.1.1 (Annex 3, paragraph 2.1 test procedure).

5.4. Verification test for service terminating performance in fire

This section describes the fire test with compressed hydrogen as the test gas. Compressed air may be used as an alternative test gas.

A hydrogen storage system is pressurised to NWP and exposed to fire (Annex 3, paragraph 5.1 test procedure). A temperature-activated pressure relief device shall release the contained gases in a controlled manner without rupture.

5.5. Requirements for primary closure devices

The primary closure devices that isolate the high pressure hydrogen storage system, namely TPRD, check valve and shut-off valve, as described in Figure 1, shall be tested and type-approved in accordance with Part II of this Regulation and produced in conformity with the approved type.

Retesting of the storage system is not required if alternative closure devices are provided having comparable function, fittings, materials, strength and dimensions, and satisfy the condition above. However, a change in TPRD hardware, its position of installation or venting lines shall require a new fire test in accordance with paragraph 5.4.

5.6. Labelling

A label shall be permanently affixed on each container with at least the following information: name of the manufacturer, serial number, date of manufacture, MFP, NWP, type of fuel (e.g. ‘CHG’ for gaseous hydrogen), and date of removal from service. Each container shall also be marked with the number of cycles used in the testing programme as per paragraph 5.1.2. Any label affixed to the container in compliance with this paragraph shall remain in place and be legible for the duration of the manufacturer's recommended service life for the container.

Date of removal from service shall not be more than 15 years after the date of manufacture.

6. PART II — SPECIFICATIONS OF SPECIFIC COMPONENTS FOR THE COMPRESSED HYDROGEN STORAGE SYSTEM

6.1. TPRD requirements

TPRDs shall meet the following performance requirements:

(a) Pressure cycling test (Annex 4, paragraph 1.1);

(b) Accelerated life test (Annex 4, paragraph 1.2);

(c) Temperature cycling test (Annex 4, paragraph 1.3);

(d) Salt corrosion resistance test (Annex 4, paragraph 1.4);

(e) Vehicle environment test (Annex 4, paragraph 1.5);

(f) Stress corrosion cracking test (Annex 4, paragraph 1.6);

(g) Drop and vibration test (Annex 4, paragraph 1.7);

(h) Leak test (Annex 4, paragraph 1.8);

(i) Bench top activation test (Annex 4, paragraph 1.9);

(j) Flow rate test (Annex 4, paragraph 1.10).

6.2. Check valve and automatic shut-off valve requirements

Check valves and automatic shut-off valves shall meet the following performance requirements:

(a) Hydrostatic strength test (Annex 4, paragraph 2.1);

(b) Leak test (Annex 4, paragraph 2.2);

(c) Extreme temperature pressure cycling test (Annex 4, paragraph 2.3);

(d) Salt corrosion resistance test (Annex 4, paragraph 2.4);

(e) Vehicle environment test (Annex 4, paragraph 2.5);

(f) Atmospheric exposure test (Annex 4, paragraph 2.6);

(g) Electrical tests (Annex 4, paragraph 2.7);

(h) Vibration test (Annex 4, paragraph 2.8);

(i) Stress corrosion cracking test (Annex 4, paragraph 2.9);

(j) Pre-cooled hydrogen exposure test (Annex 4, paragraph 2.10).

6.3. At least the following information: MFP and type of fuel (e.g. ‘CHG’ for gaseous hydrogen), shall be marked on each component having the function(s) of the primary closure devices in 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 vehicle passenger or luggage compartments; (iii) Into or towards any vehicle wheel housing; (iv) Towards hydrogen gas containers.

7.1.3.2. Vehicle exhaust system (Annex 5, paragraph 4 test procedure)

At the vehicle exhaust system's point of discharge, the hydrogen concentration level shall:

(a) Not exceed 4 per cent average by volume during any moving three-second time interval during normal operation including start-up and shut-down;

(b) And not exceed 8 per cent at any time (Annex 5, paragraph 4 test procedure).

7.1.4. Protection against flammable conditions: single failure conditions

7.1.4.1. Hydrogen leakage and/or permeation from the hydrogen storage system shall not directly vent into the passenger or luggage compartments, or to any enclosed or semi-enclosed spaces within the vehicle that contains unprotected ignition sources.

7.1.4.2. Any single failure downstream of the main hydrogen shut-off valve shall not result in accumulations in levels of hydrogen concentration in the passenger compartment according to test procedure in Annex 5, paragraph 3.2.

7.1.4.3. If, during operation, a single failure results in a hydrogen concentration exceeding 3,0 per cent by volume in air in the enclosed or semi-enclosed spaces of the vehicle, then a warning shall be provided (paragraph 7.1.6). If the hydrogen concentration exceeds 4,0 per cent by volume in the air in the enclosed or semi-enclosed spaces of the vehicle, the main shut-off valve shall be closed to isolate the storage system. (Annex 5, paragraph 3 test procedure).

7.1.5. Fuel system leakage

The hydrogen fuelling line (e.g. piping, joint, etc.) downstream of the main shut-off valve(s) to the fuel cell system or the engine shall not leak. Compliance shall be verified at NWP (Annex 5, paragraph 5 test procedure).

7.1.6. Tell-tale signal warning to driver

The warning shall be given by a visual signal or display text with the following properties:

(a) Visible to the driver while in the driver's designated seating position with the driver's seat belt fastened;

(b) Yellow in colour if the detection system malfunctions (e.g. circuit disconnection, short-circuit, sensor fault). It shall be red in compliance with section paragraph 7.1.4.3;

(c) When illuminated, shall be visible to the driver under both daylight and night time driving conditions;

(d) Remains illuminated when 3,0 per cent concentration or detection system malfunction exists and the ignition locking system is in the ‘On’ (‘Run’) position or the propulsion system is activated.

7.2. Post-crash fuel system integrity

The vehicle fuel system shall comply with the following requirements after the vehicle crash tests in accordance with the following Regulations by also applying the test procedures prescribed in Annex 5 of this Regulation.

(a) Frontal impact test in accordance with either Regulation No 12, or Regulation No 94; and

(b) Lateral impact test in accordance with Regulation No 95.

In case that one or both of the vehicle crash tests specified above are not applicable to the vehicle, the vehicle fuel system shall, instead, be subject to the relevant alternative accelerations specified below and the hydrogen storage system shall be installed in a position satisfying the requirements in paragraph 7.2.4. The accelerations shall be measured at the location where the hydrogen storage system is installed. The vehicle fuel system shall be mounted and fixed on the representative part of the vehicle. The mass used shall be representative for a fully equipped and filled container or container assembly.

Accelerations for vehicles of categories M1 and N1:

(a) 20 g in the direction of travel (forward and rearward direction);

(b) 8 g horizontally perpendicular to the direction of travel (to left and right).

Accelerations for vehicles of categories M2 and N2:

(a) 10 g in the direction of travel (forward and rearward direction);

(b) 5 g horizontally perpendicular to the direction of travel (to left and right).

Accelerations for vehicles of categories M3 and N3:

(a) 6,6 g in the direction of travel (forward and rearward direction);

(b) 5 g horizontally perpendicular to the direction of travel (to left and right).

7.2.1. Fuel leakage limit

The volumetric flow of hydrogen gas leakage shall not exceed an average of 118 Nl per minute for the time interval, Δt, as determined in accordance with Annex 5, paragraph 1.1 or 1.2.

7.2.2. Concentration limit in enclosed spaces

Hydrogen gas leakage shall not result in a hydrogen concentration in the air greater than 4,0 per cent by volume in the passenger and luggage compartments (Annex 5, paragraph 2 test procedures). The requirement is satisfied if it is confirmed that the shut-off valve of the storage system has closed within 5 seconds of the crash and no leakage from the storage system.

7.2.3. Container Displacement

The storage container(s) shall remain attached to the vehicle at a minimum of one attachment point.

7.2.4. Additional installation requirements

7.2.4.1. Requirements on installation of the hydrogen storage system not subject to the frontal impact test:

The container shall be mounted in a position which is rearward of a vertical plane perpendicular to the centre line of the vehicle and located 420 mm rearward from the front edge of the vehicle.

7.2.4.2. Requirements on installation of the hydrogen storage system not subject to the lateral impact test:

The container shall be mounted in a position which is between the two vertical planes parallel to the centre line of the vehicle located 200 mm inside from the both outermost edge of the vehicle in the proximity of its container(s).

8. MODIFICATION OF TYPE AND EXTENSION OF APPROVAL

8.1. Every modification to an existing type of vehicle or hydrogen storage system or specific component for hydrogen storage system shall be notified to the Type Approval Authority which approved that type. The Authority shall then either:

(a) Decide, in consultation with the manufacturer, that a new type-approval is to be granted; or

(b) Apply the procedure contained in paragraph 8.1.1 (Revision) and, if applicable, the procedure contained in paragraph 8.1.2 (Extension).

8.1.1. Revision

When particulars recorded in the information documents of Annex 1 have changed and the Type Approval Authority considers that the modifications made are unlikely to have an appreciable adverse effect and that in any case the vehicle/hydrogen storage system/specific component still meets the requirements, the modification shall be designated a ‘revision’.

In such a case, the Type Approval Authority shall issue the revised pages of the information documents of Annex 1 as necessary, marking each revised page to show clearly the nature of the modification and the date of re-issue. A consolidated, updated version of the information documents of Annex 1, accompanied by a detailed description of the modification, shall be deemed to meet this requirement.

8.1.2. Extension

The modification shall be designated an ‘extension’ if, in addition to the change of the particulars recorded in the information folder,

(a) Further inspections or tests are required; or

(b) Any information on the communication document (with the exception of its attachments) has changed; or

(c) Approval to a later series of amendments is requested after its entry into force.

8.2. Confirmation or refusal of approval, specifying the alterations, shall be communicated by the procedure specified in paragraph 4.3 above to the Contracting Parties to the Agreement which apply this Regulation. In addition, the index to the information documents and to the test reports, attached to the communication document of Annex 1, shall be amended accordingly to show the date of the most recent revision or extension.

8.3. The Type Approval Authority issuing the extension of approval shall assign a serial number to each communication form drawn up for such an extension.

9. CONFORMITY OF PRODUCTION

Procedures concerning conformity of production shall conform to the general provisions defined in Appendix 2 to the Agreement (E/ECE/324-E/ECE/TRANS/505/Rev.2) and at least meet the following requirements:

9.1. A vehicle, hydrogen storage system or component approved pursuant to this Regulation shall be so manufactured as to conform to the type approved by meeting the respective requirements of paragraphs 5 to 7 above;

9.2. The Type Approval Authority which has granted approval may at any time verify the conformity of control methods applicable to each production unit. The normal frequency of such inspections shall be once every two years.

9.3. In case of compressed hydrogen storage system, the production control of the container shall satisfy the following additional requirements; 9.3.1. Every container shall be tested in accordance with paragraph 5.2.1 of this Regulation. The test pressure is ≥ 150 per cent of NWP. 9.3.2. Batch testing In any case, for each batch, which is not permitted to exceed 200 finished cylinders or liners (not including destructive test cylinders or liners), or one shift of successive production, whichever is greater, at least one container shall be subjected to the rupture test in paragraph 9.3.2.1 and furthermore at least one container shall be subjected to the pressure cycle test in paragraph 9.3.2.2. 9.3.2.1. Rupture test in batch testing The test shall be performed according to paragraph 2.1 (hydrostatic pressure rupture test) of Annex 3. The required rupture pressure shall be at least BPmin and the average burst pressure recorded of the last 10 tests shall be at or above BPO-10 per cent. 9.3.2.2. Ambient temperature pressure cycling test in batch testing The test shall be performed according to paragraph 2.2(a) to (c) (hydrostatic pressure cycling test) of Annex 3, except that the temperature requirements for the fuelling fluid and the container skin, and the relative humidity requirement, do not apply. The cylinder shall be pressure cycled using hydrostatic pressures ≥ 125 per cent of NWP, to 22 000 cycles in case of no leakage or until leakage occurs. For the service life of 15 years, the cylinder shall not leak or rupture within the first 11 000 cycles. 9.3.2.3. Relaxation provisions In the ambient temperature pressure cycling test in batch testing, finished cylinders shall be pressure cycled at a sampling frequency defined as follows: 9.3.2.3.1. One cylinder from each batch shall be pressure cycled with 11 000 cycles for the service life of 15 years. 9.3.2.3.2. On 10 sequential production batches of the same design, should none of the pressure cycled cylinders leak or rupture in less than 11 000 cycles × 1,5 for the service life of 15 years, then the pressure cycling test can be reduced to one cylinder from every 5 batches of production. 9.3.2.3.3. On 10 sequential production batches of the same design, should none of the pressure cycled cylinders leak or rupture in less than 11 000 cycles × 2,0 for the service life of 15 years, then the pressure cycling test can be reduced to one cylinder from every 10 batches of production. 9.3.2.3.4. Should more than 6 months have expired since the last batch of production, then the sampling frequency for the next batch of production shall be that specified in paragraph 9.3.2.3.2 or 9.3.2.3.3 above. 9.3.2.3.5. Should any cylinder tested at the sampling frequency in paragraph 9.3.2.3.2 or 9.3.2.3.3 above fail to meet the required number of pressure cycles, then it shall be necessary to repeat the pressure cycling test at the sampling frequency in paragraph 9.3.2.3.1 above for a minimum 10 production batches. The sampling frequency for testing thereafter shall be that specified in paragraph 9.3.2.3.2 or 9.3.2.3.3 above. 9.3.2.3.6. Should any cylinder tested at the sampling frequency in paragraph 9.3.2.3.1, 9.3.2.3.2 or 9.3.2.3.3 above fail to meet the minimum requirement regarding the number of pressure cycles (11 000 cycles), then the cause of failure shall be determined and corrected following the procedures in paragraph 9.3.2.3.7. The pressure cycling test shall then be repeated on an additional three cylinders from that batch. Should any of the three additional cylinders fail to meet the minimum requirement regarding the number of pressure cycles (11 000 cycles), then all cylinders of this batch shall be rejected. 9.3.2.3.7. In the event of failure to meet test requirements retesting or reheat treatment and retesting shall be carried out as follows: (a) If there is evidence of a fault in carrying out a test, or an error of measurement, a further test shall be performed. If the result of this test is satisfactory, the first test shall be ignored; (b) If the test has been carried out in a satisfactory manner, the cause of test failure shall be identified. All cylinders that fail to meet the requirements shall be rejected or repaired by an approved method. The non-rejected cylinders are then considered as a new batch. In any case, the new batch shall be retested. All the relevant prototype or batch tests needed to prove the acceptability of the new batch shall be performed again. If any cylinder in a batch is proven unsatisfactory by one or more tests, all cylinders of this batch shall be rejected.

10. PENALTIES FOR NON-CONFORMITY OF PRODUCTION

10.1. The approval granted in respect of a vehicle, system or component type pursuant to this Regulation may be withdrawn if the requirements laid down in paragraph 9 above are not complied with.

10.2. If a Contracting Party withdraws an approval it had previously granted, it shall forthwith so notify the other Contracting Parties applying this Regulation by sending them a communication form conforming to the model set out in Part 2 of Annex 1 to this Regulation.

11. PRODUCTION DEFINITIVELY DISCONTINUED

If the holder of the approval completely ceases to manufacture a type of vehicle, system or component approved in accordance with this Regulation, he shall so inform the authority which granted the approval, which in turn shall forthwith inform the other Contracting Parties to the Agreement applying this Regulation by means of a communication form conforming to the model set out in Part 2 of Annex 1 to this Regulation.

12. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR CONDUCTING APPROVAL TESTS AND OF THE TYPE APPROVAL AUTHORITIES

The Contracting Parties to the Agreement applying this Regulation shall communicate to the United Nations secretariat the names and addresses of the Technical Services responsible for conducting approval tests and of the Type Approval Authorities which grant approval and to which forms certifying approval or extension or refusal or withdrawal of approval are to be sent.

(1) This Regulation does not cover the electrical safety of electric power train, the material compatibility and hydrogen embrittlement of the vehicle fuel system, and the post crash fuel system integrity in the event of full width frontal impact and rear impact.

(2) As defined in the Consolidated Resolution on the Construction of Vehicles (R.E.3.), document ECE/TRANS/WP.29/78/Rev.3, para. 2. — www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29resolutions.html

(3) The distinguishing numbers of the Contracting Parties to the 1958 Agreement are reproduced in Annex 3 to the Consolidated Resolution on the Construction of Vehicles (R.E.3), document ECE/TRANS/WP.29/78/Rev. 3, Annex 3 — www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29resolutions.html