Regulation No. 134-00

Name:Regulation No. 134-00
Description:Hydrogen and Fuel Cell Vehicles (HFCV).
Official Title:Uniform Provisions Concerning the Approval of Motor Vehicles and their Components with Regard to the Safety-related Performance of Hydrogen-fuelled Vehicles (HFCV).
Country:ECE - United Nations
Date of Issue:2015-06-25
Amendment Level:00 Series, Supplement 2
Number of Pages:65
Vehicle Types:Bus, Car, Component, Heavy Truck, Light Truck
Subject Categories:Electrical and Electronic, Miscellaneous, Occupant Protection
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Keywords:

test, pressure, hydrogen, system, paragraph, storage, annex, temperature, approval, vehicle, container, valve, type, cycles, regulation, nwp, tprd, gas, fire, performance, compressed, fuel, tests, requirements, component, leak, unit, part, procedure, exposure, vehicles, time, shut-off, flow, service, specific, means, maximum, number, cycling, testing, components, leakage, performed, check, rate, burst, information, date, manufacturer

Text Extract:

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E/ECE/324
) Rev.2/Add.133/Amend.2
E/ECE/TRANS/505 )
February 22, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 134-00
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
MOTOR VEHICLES AND THEIR COMPONENTS WITH REGARD TO THE
SAFETY-RELATED PERFORMANCE OF HYDROGEN-FUELLED VEHICLES (HFCV)
Incorporating:
00 series of amendments
Date of Entry into Force: 15.06.15
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 20.01.16
Supplement 2 to the 00 series of amendments
Date of Entry into Force: 09.02.17

REGULATION NO. 134-00
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF MOTOR VEHICLES AND
THEIR COMPONENTS WITH REGARD TO THE SAFETY-RELATED PERFORMANCE OF
HYDROGEN-FUELLED VEHICLES (HFCV)
REGULATION
1. Scope
2. Definitions
3. Application for approval
4. Approval
CONTENTS
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 definitely discontinued
12. Names and addresses of Technical Services responsible for conducting approval tests, and
of the Type Approval Authorities
13. Transitional provisions

REGULATION NO. 134-00
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF MOTOR VEHICLES AND
THEIR COMPONENTS WITH REGARD TO THE SAFETY RELATED PERFORMANCE OF
HYDROGEN-FUELLED VEHICLES (HFCV)
1. SCOPE
This Regulation applies to:
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 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 pressurized 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.

2.22. "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)
(b)
(c)
(d)
(e)
The manufacturer's trade name or mark;
The state of stored hydrogen fuel; compressed gas;
The nominal working pressure (NWP);
The structure, materials, capacity and physical dimensions of the container; and
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)
(b)
(c)
(d)
The manufacturer's trade name or mark;
The state of stored hydrogen fuel; compressed gas;
The sort of component: (T)PRD, check-valve or shut-off valve; and
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)
(b)
The manufacturer's trade name or mark; and
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 authorized representative.

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 × 297mm), 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;
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 pressurized container, three
closure devices and their fittings. The closure devices shall include the following functions,
which may be combined:
(a)
(b)
TPRD;
Check valve that prevents reverse flow to the fill line; and

Table 1
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 pressurized until burst. The manufacturer shall
supply documentation (measurements and statistical analyses) that establish the midpoint
burst pressure of new storage containers, BP .
All containers tested shall have a burst pressure within ±10% of BP and greater than or
equal to a minimum BPmin of 225% NWP.
In addition, containers having glass-fibre composite as a primary constituent to have a
minimum burst pressure greater than 350% NWP.

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% NWP (+2/-0MPa) at 20 (±5)°C for 60% 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% NWP (+2/-0MPa).
5.2.5. High Temperature Static Pressure Test.
The storage container is pressurized to 125% NWP (+2/-0MPa) at ≥85°C for at least 1,000h
(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% NWP (+2/-0MPa) for 20%
number of Cycles and at ≥+85°C and 95 (±2) % relative humidity to 125% NWP (+2/-0MPa)
for 20% number of Cycles (Annex 3, Paragraph 2.2. test procedure).
5.2.7. Hydraulic residual pressure test. The storage container is pressurized to 180% NWP
(+2/-0MPa) and held at least 4min without burst (Annex 3, Paragraph 3.1. test procedure).
5.2.8. Residual Burst Strength Test
The storage container undergoes a hydraulic burst test to verify that the burst pressure is at
least 80% of the baseline initial burst pressure (BP ) 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.

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)
(b)
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;
The first group of pressure cycling, 25 cycles are performed to 80% NWP (+2/-0MPa)
at ≤-40°C, then 25 cycles to 125% NWP (+2/-0MPa) at ≥ +50°C and 95 (±2)% relative
humidity,
and
the
remaining
200
cycles
to
125%
NWP
(+2/-0MPa)
at
20 (±5)°C;
The second group of pressure cycling, 25 cycles are performed to 125% NWP
(+2/-0MPa) at ≥ +50°C and 95 (±2)% relative humidity, then 25 cycles to 80% NWP
(+2/-0MPa) at ≤ -40°C, and the remaining 200 cycles to 125% NWP (+2/-0MPa) at
20 (±5)°C.
(c)
(d)
(e)
The hydrogen gas fuel temperature is ≤ -40°C;
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% relative humidity;
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)
(b)
(c)
The test is performed after each group of 250 pneumatic pressure cycles in
Paragraph 5.3.2.;
The maximum allowable hydrogen discharge from the compressed hydrogen storage
system is 46ml/h/l water capacity of the storage system. (Annex 3, Paragraph 4.2.
test procedure);
If the measured permeation rate is greater than 0.005mg/s (3.6Nml/min), a localized
leak test is performed to ensure no point of localized external leakage is greater than
0.005mg/s (3.6Nml/min) (Annex 3, Paragraph 4.3. test procedure).
5.3.4. Residual Proof Pressure Test (Hydraulic)
The storage container is pressurized to 180% NWP (+2/-0MPa) and held at least 4min
without burst (Annex 3, Paragraph 3.1. test procedure).

(c)
Accelerated life test (Annex4, Paragraph 1.2.);
(d)
Temperature cycling test (Annex4, Paragraph 1.3.);
(e)
Salt corrosion resistance test (Annex 4, Paragraph 1.4.);
(f)
Vehicle environment test (Annex 4, Paragraph 1.5.);
(g)
Stress corrosion cracking test (Annex 4, Paragraph 1.6.);
(h)
Drop and vibration test (Annex 4, Paragraph 1.7.);
(i)
Leak test (Annex 4, Paragraph 1.8.);
(j)
Bench top activation test (Annex 4, Paragraph 1.9.);
(k)
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.

(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)
(ii)
(iii)
(iv)
Towards exposed electrical terminals, exposed electrical switches or other
ignition sources;
Into or towards the vehicle passenger or luggage compartments;
Into or towards any vehicle wheel housing;
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)
(b)
Not exceed 4% average by volume during any moving three-second time interval
during normal operation including start-up and shut-down;
And not exceed 8% 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% 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% 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).

7.2.1. Fuel Leakage Limit
The volumetric flow of hydrogen gas leakage shall not exceed an average of 118Nl 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% 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 5s 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 420mm 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 200mm 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)
(b)
Decide, in consultation with the manufacturer, that a new type-approval is to be
granted; or
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".

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 BP -10%, and in no case less
than the value necessary to meet the stress ratio requirements.
9.3.2.2. Ambient Temperature Pressure Cycling Test in Batch Testing
The test shall be performed according to Paragraph 2.2. (hydrostatic pressure cycling test)
of Annex 3. The cylinder shall be pressure cycled using hydrostatic pressures up to 125% of
NWP (+2/-0MPa), to 22,000 cycles in case of no leakage or until leakage occurs. The
relative humidity shall not be specified. 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.

ANNEX 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
The following information, if applicable, shall include a list of contents. Any drawings shall be supplied in
appropriate scale and in sufficient detail on size A4 or on a folder of A4 format. Photographs, if any, shall
show sufficient details.
If the systems or components have electronic controls, information concerning their performance shall be
supplied.
0. General
0.1. Make (trade name of manufacturer): .........................................................................................
0.2. Type: ..........................................................................................................................................
0.2.1. Commercial name(s) (if available): ............................................................................................
0.5. Name and address of manufacturer: .........................................................................................
0.8. Name(s) and address(es) of assembly plant(s): ........................................................................
0.9. Name and address of the manufacturer's representative (if any): .............................................
3. Power Plant
3.9. Hydrogen storage system
3.9.1. Hydrogen storage system designed to use liquid/compressed (gaseous) hydrogen
3.9.1.1. Description and drawing of the hydrogen storage system: ........................................................
3.9.1.2. Make(s): .....................................................................................................................................
3.9.1.3. Type(s): ......................................................................................................................................
3.9.2. Container(s)
3.9.2.1. Make(s): .....................................................................................................................................
3.9.2.2. Type(s): ......................................................................................................................................
3.9.2.3. Maximum Allowable Working Pressure (MAWP): MPa
3.9.2.4. Nominal working pressure(s): MPa

3.9.5.3. Maximum Allowable Working Pressure (MAWP): MPa
3.9.5.4. Nominal working pressure(s) and if downstream of the first pressure regulator, maximum
allowable working pressure(s): MPa
3.9.5.5. Material: .....................................................................................................................................
3.9.5.6. Description and drawing: ..........................................................................................................
3.9.5.7. Approval number: ......................................................................................................................

3.9.4. Check valve(s)
3.9.4.1. Make(s): ....................................................................................................................................
3.9.4.2. Type(s): ......................................................................................................................................
3.9.4.3. Maximum Allowable Working Pressure (MAWP): MPa
3.9.4.4. Nominal working pressure(s): MPa
3.9.4.5. Material: .....................................................................................................................................
3.9.4.6. Description and drawing: ...........................................................................................................
3.9.5. Automatic shut-off valve(s)
3.9.5.1. Make(s): .....................................................................................................................................
3.9.5.2. Type(s): ......................................................................................................................................
3.9.5.3. Maximum Allowable Working Pressure (MAWP): MPa
3.9.5.4. Nominal working pressure(s) and if downstream of the first pressure regulator, maximum
allowable working pressure(s): MPa:
3.9.5.5. Material: .....................................................................................................................................
3.9.5.6. Description and drawing: ...........................................................................................................

3.
Power Plant
3.9.
Hydrogen storage system
3.9.1.
Hydrogen storage system designed to use liquid/compressed (gaseous) hydrogen
3.9.1.1.
Description and drawing of the hydrogen storage system: ........................................................
3.9.1.2.
Make(s): .....................................................................................................................................
3.9.1.3.
Type(s): ......................................................................................................................................
3.9.1.4.
Approval Number: ......................................................................................................................
3.9.6.
Hydrogen leakage detection sensors: ........................................................................................
3.9.6.1.
Make(s): .....................................................................................................................................
3.9.6.2.
Type(s): ......................................................................................................................................
3.9.7.
Refuelling connection or receptacle
3.9.7.1.
Make(s): .....................................................................................................................................
3.9.7.2.
Type(s): ......................................................................................................................................
3.9.8.
Drawings showing requirements for installation and operation.

11.
Place: .....................................................................................................................................................
12.
Date: ......................................................................................................................................................
13.
Signature: ..............................................................................................................................................
14.
The information document annexed to this communication: ................................................................
15.
Any remarks: .........................................................................................................................................

11.
Place: .....................................................................................................................................................
12.
Date: ......................................................................................................................................................
13.
Signature: ..............................................................................................................................................
14.
The information document annexed to this communication: .................................................................
15.
Any remarks: .........................................................................................................................................

10. Approval with regard to the safety-related performance of hydrogen-fuelled vehicles is
granted/refused: .................................................................................................................................
11. Place: .....................................................................................................................................................
12. Date: ......................................................................................................................................................
13. Signature: ..............................................................................................................................................
14. The information document annexed to this communication: .................................................................
15. Any remarks: .........................................................................................................................................

ANNEX 3
TEST PROCEDURES FOR THE COMPRESSED HYDROGEN STORAGE SYSTEM
1. Test procedures for qualification requirements of compressed hydrogen storage are organized
as follows:
Paragraph 2 of this Annex is the test procedures for baseline performance metrics (requirement
of Paragraph 5.1. of this Regulation)
Paragraph 3 of this Annex is the test procedures for performance durability (requirement of
Paragraph 5.2. of this Regulation)
Paragraph 4 of this Annex is the test procedures for expected on-road performance
(requirement of Paragraph 5.3. of this Regulation)
Paragraph 5 of this Annex is the test procedures for service terminating performance in fire
(requirement of Paragraph 5.4. of this Regulation)
Paragraph 6 of this Annex is the test procedures for performance durability of primary closures
(requirement of Paragraph 5.5. of this Regulation)
2. Test procedures for baseline performance metrics (requirement of Paragraph 5.1. of this
Regulation)
2.1. Burst Test (Hydraulic)
The burst test is conducted at 20 (±5)°C using a non-corrosive fluid. The rate of pressurization
is less than or equal to 1.4MPa/sec for pressures higher than 150% of the nominal working
pressure. If the rate exceeds 0.35MPa/sec at pressures higher than 150% NWP, then either
the container is placed in series between the pressure source and the pressure measurement
device, or the time at the pressure above a target burst pressure exceeds 5s. The burst
pressure of the container shall be recorded.
2.2. Pressure Cycling Test (Hydraulic)
The test is performed in accordance with the following procedure:
(a)
(b)
(c)
(d)
The container is filled with a non-corrosive fluid;
The container and fluid are stabilized at the specified temperature and relative
humidity at the start of testing; the environment, fuelling fluid and container skin are
maintained at the specified temperature for the duration of the testing. The container
temperature may vary from the environmental temperature during testing;
The container is pressure cycled between 2 (±1)MPa and the target pressure at a rate
not exceeding 10 cycles per minute for the specified number of cycles;
The temperature of the hydraulic fluid within the container is maintained and
monitored at the specified temperature.

Figure 1
Drop Orientations
No attempt shall be made to prevent the bouncing of containers, but the containers may be
prevented from falling over during the vertical drop tests described above.
If more than one container is used to execute all drop specifications, then those containers
shall undergo pressure cycling according to Annex 3, Paragraph 2.2. until either leakage or
22,000 cycles without leakage have occurred. Leakage shall not occur within 11,000 cycles.
The orientation of the container being dropped in accordance with the requirement of
Paragraph 5.2.2. shall be identified as follows:
(a)
(b)
(c)
If a single container was subjected to all four drop orientations, then the container
being dropped in accordance with the requirement of Paragraph 5.2.2. shall be
dropped in all four orientations;
If more than one container is used to execute the four drop orientations, and if all
containers reach 22,000 cycles without leakage, then the orientation of the container
being dropped in accordance with the requirement Paragraph 5.2.2. is the 45°
orientation (iv), and that container shall then undergo further testing as specified in
Paragraph 5.2.;
If more than one container is used to execute the four drop orientations and if any
container does not reach 22,000 cycles without leakage, then the new container shall
be subjected to the drop orientation(s) that resulted in the lowest number of cycles to
leakage and then will undergo further testing as specified in Paragraph 5.2.
3.3. Surface Damage Test (Unpressurized)
The test proceeds in the following sequence:
(a)
Surface flaw generation: Two longitudinal saw cuts are made on the bottom outer
surface of the unpressurized horizontal storage container along the cylindrical zone
close to but not in the shoulder area. The first cut is at least 1.25mm deep and 25mm
long toward the valve end of the container. The second cut is at least 0.75mm deep
and 200mm long toward the end of the container opposite the valve;

3.5. Static Pressure Test (Hydraulic)
The storage system is pressurized to the target pressure in a temperature-controlled chamber.
The temperature of the chamber and the non-corrosive fuelling fluid is held at the target
temperature within ±5°C for the specified duration.
4 TEST PROCEDURES FOR EXPECTED ON-ROAD PERFORMANCE (Paragraph 5.3. of this
Regulation)
(Pneumatic test procedures are provided; hydraulic test elements are described in Annex 3,
Paragraph 2.1.)
4.1. Gas Pressure Cycling Test (Pneumatic)
At the onset of testing, the storage system is stabilized at the specified temperature, relative
humidity and fuel level for at least 24h. The specified temperature and relative humidity is
maintained within the test environment throughout the remainder of the test. (When required in
the test specification, the system temperature is stabilized at the external environmental
temperature between pressure cycles.) The storage system is pressure cycled between less
than 2 (+0/-1)MPa and the specified maximum pressure (±1MPa). If system controls that are
active in vehicle service prevent the pressure from dropping below a specified pressure, the
test cycles shall not go below that specified pressure. The fill rate is controlled to a constant
3min pressure ramp rate, but with the fuel flow not to exceed 60g/sec; the temperature of the
hydrogen fuel dispensed to the container is controlled to the specified temperature. However,
the pressure ramp rate should be decreased if the gas temperature in the container exceeds
+85°C. The defuelling rate is controlled to greater than or equal to the intended vehicle's
maximum fuel-demand rate. The specified number of pressure cycles is conducted. If devices
and/or controls are used in the intended vehicle application to prevent an extreme internal
temperature, the test may be conducted with these devices and/or controls (or equivalent
measures).
4.2. Gas Permeation Test (Pneumatic)
A storage system is fully filled with hydrogen gas at 115% NWP (+2/-0MPa) (full fill density
equivalent to 100% NWP at +15°C is 113% NWP at +55°C) and held at ≥+55°C in a sealed
container until steady-state permeation or 30h, whichever is longer. The total steady-state
discharge rate due to leakage and permeation from the storage system is measured.
4.3. Localized Gas Leak Test (Pneumatic)
A bubble test may be used to fulfil this requirement. The following procedure is used when
conducting the bubble test:
(a)
The exhaust of the shut-off valve (and other internal connections to hydrogen
systems) shall be capped for this test (as the test is focused on external leakage).
At the discretion of the tester, the test article may be immersed in the leak-test fluid or
leak-test fluid applied to the test article when resting in open air. Bubbles can vary
greatly in size, depending on conditions. The tester estimates the gas leakage based
on the size and rate of bubble formation.

5.1.2. The following test requirements apply whether Method 1 or 2 (above) is used:
(a)
(b)
The container assembly is filled with compressed hydrogen gas at 100% of NWP
(+2/-0MPa). The container assembly is positioned horizontally approximately 100mm
above the fire source;
Localized portion of the fire test:
(i)
(ii)
(iii)
(iv)
(v)
The localized fire exposure area is located on the test article furthest from the
TPRD(s). If Method 2 is selected and more vulnerable areas are identified for a
specific vehicle installation configuration, the more vulnerable area that is
furthest from the TPRD(s) is positioned directly over the initial fire source;
The fire source consists of LPG burners configured to produce a uniform
minimum temperature on the test article measured with a minimum
5 thermocouples covering the length of the test article up to 1.65m maximum
(at least 2 thermocouples within the localized fire exposure area, and at least
3 thermocouples equally spaced and no more than 0.5m apart in the remaining
area) located 25 (±10)mm from the outside surface of the test article along its
longitudinal axis. At the option of the manufacturer or testing facility, additional
thermocouples may be located at TPRD sensing points or any other locations
for optional diagnostic purposes;
Wind shields are applied to ensure uniform heating;
The fire source initiates within a 250 (±50)mm longitudinal expanse positioned
under the localized fire exposure area of the test article. The width of the fire
source encompasses the entire diameter (width) of the storage system. If
Method 2 is selected, the length and width shall be reduced, if necessary, to
account for vehicle-specific features;
As shown in Figure 3 the temperature of the thermocouples in the localized fire
exposure area has increased continuously to at least 300°C within 1min of
ignition, to at least 600°C within 3min of ignition, and a temperature of at least
600°C is maintained for the next 7min. The temperature in the localized fire
exposure area shall not exceed 900°C during this period. Compliance to the
thermal requirements begins 1min after entering the period with minimum and
maximum limits and is based on a 1min rolling average of each thermocouple
in the region of interest. (Note: The temperature outside the region of the initial
fire source is not specified during these initial 10min from the time of ignition.).

Table 1
Summary of Fire Test Protocol
Localized Fire Exposure
Time Period
Engulfing Fire Region (Outside the
Localized Fire Region)
Action
Ignite Burners
0-1min
No Burner Operation
Minimum temperature
Not specified
Not specified
Maximum temperature
Less than 900°C
Not specified
Action
Increase temperature and stabilize fire
for start of localized fire exposure
1-3min
No Burner Operation
Minimum temperature
Greater than 300°C
Not specified
Maximum temperature
Less than 900°C
Not specified
Action
Localized fire exposure continues
No Burner Operation
Minimum temperature
Maximum temperature
Action
1min rolling average greater than
600°C
1min rolling average greater than
900°C 3-10min
Increase temperature
Not specified
Not specified
Main Burner Ignited at 10min
Minimum temperature
Maximum temperature
1min rolling average greater than
600°C
1min rolling average less than 1,100°C
10-11min
Not specified
Less than 1,100°C
Action
Minimum temperature
Increase temperature and stabilize fire
for start of engulfing fire exposure
1min rolling average greater than
600°C
Increase temperature and stabilize
fire for start of engulfing fire
exposure
Greater than 300°C
Maximum temperature
1min rolling average less than 1,100°C
11-12min
Less than 1,100°C
Action
Engulfing fire exposure continues
Engulfing fire exposure continues
Minimum temperature
Maximum temperature
1min rolling average greater than
800°C
1min rolling average less than 1,100°C
12min – end
of test
1min rolling average greater than
800°C
1min rolling average less than
1,100°C

ANNEX 4
TEST PROCEDURES FOR SPECIFIC COMPONENTS FOR THE COMPRESSED HYDROGEN
STORAGE SYSTEM
1. TPRD QUALIFICATION PERFORMANCE TESTS
Testing is performed with hydrogen gas having gas quality compliant with ISO 14687-2/SAE
J2719. All tests are performed at ambient temperature 20 (±5)°C unless otherwise specified.
The TPRD qualification performance tests are specified as follows (see also Appendix 1):
1.1. Pressure Cycling Test.
Five TPRD units undergo 11,000 internal pressure cycles with hydrogen gas having gas quality
compliant with ISO 14687-2/SAE J2719. The first five pressure cycles are between 2 (±1)MPa
and 150% NWP (±1MPa); the remaining cycles are between 2 (±1)MPa and 125% NWP
(±1MPa). The first 1,500 pressure cycles are conducted at a TPRD temperature of 85°C or
higher. The remaining cycles are conducted at a TPRD temperature of 55 (±5)°C. The
maximum pressure cycling rate is ten cycles per minute. Following this test, the pressure relief
device shall comply the requirements of Leak test (Annex 4, Paragraph 1.8.), Flow rate test
(Annex 4, Paragraph 1.10.) and Bench top activation test (Annex 4 Paragraph 1.9.).
1.2. Accelerated Life Test.
Eight TPRD units undergo testing; three at the manufacturer's specified activation temperature,
Tact, and five at an accelerated life temperature, Tlife = 9.1 × Tact The TPRD is placed in
an oven or liquid bath with the temperature held constant (±1°C). The hydrogen gas pressure
on the TPRD inlet is 125% NWP (±1MPa). The pressure supply may be located outside the
controlled temperature oven or bath. Each device is pressured individually or through a
manifold system. If a manifold system is used, each pressure connection includes a check
valve to prevent pressure depletion of the system when one specimen fails. The three TPRDs
tested at Tact shall activate in less than ten hours. The five TPRDs tested at Tlife shall not
activate in less than 500h.
1.3. Temperature Cycling Test
(a)
(b)
(c)
(d)
An unpressurized TPRD is placed in a liquid bath maintained at -40°C or lower at least
two hours. The TPRD is transferred to a liquid bath maintained at +85°C or higher within
five minutes, and maintained at that temperature at least two hours. The TPRD is
transferred to a liquid bath maintained at -40°C or lower within five minutes;
Step (a) is repeated until 15 thermal cycles have been achieved;
With the TPRD conditioned for a minimum of two hours in the -40°C or lower liquid bath,
the internal pressure of the TPRD is cycled with hydrogen gas between 2MPa
(+1/-0MPa) and 80% NWP (+2/-0MPa) for 100 cycles while the liquid bath is maintained
at -40°C or lower;
Following the thermal and pressure cycling, the pressure relief device shall comply with
the requirements of Leak test (Annex 4, Paragraph 1.8.), except that the Leak test shall
be conducted at -40°C (+5/-0°C). After the Leak test, the TPRD shall comply with the
requirements of Bench top activation test (Annex 4, Paragraph 1.9.) and then Flow rate
test (Annex 4, Paragraph 1.10.)

Aqueous ammonia having a specific gravity of 0.94 is maintained at the bottom of the glass
chamber below the sample at a concentration of at least 20ml per litre of chamber volume. The
sample is positioned 35 (±5)mm above the aqueous ammonia solution and supported in an
inert tray. The moist ammonia-air mixture is maintained at atmospheric pressure at 35 (±5)°C.
Copper-based alloy components shall not exhibit cracking or delaminating due to this test.
1.7. Drop and Vibration Test
(a)
(b)
Six TPRD units are dropped from a height of 2m at ambient temperature (20 ± 5°C ) onto
a smooth concrete surface. Each sample is allowed to bounce on the concrete surface
after the initial impact. One unit is dropped in six orientations (opposing directions of 3
orthogonal axes: vertical, lateral and longitudinal). If each of the six dropped samples
does not show visible exterior damage that indicates that the part is unsuitable for use, it
shall proceed to step (b) ;
Each of the six TPRD units dropped in step (a) and one additional unit not subjected to a
drop are mounted in a test fixture in accordance with manufacturer's installation
instructions and vibrated 30min along each of the three orthogonal axes (vertical, lateral
and longitudinal) at the most severe resonant frequency for each axis. The most severe
resonant frequencies are determined using an acceleration of 1.5g and sweeping
through a sinusoidal frequency range of 10 to 500Hz within 10min. The resonance
frequency is identified by a pronounced increase in vibration amplitude. If the resonance
frequency is not found in this range, the test shall be conducted at 40Hz. Following this
test, each sample shall not show visible exterior damage that indicates that the part is
unsuitable for use. It shall subsequently comply with the requirements of Leak test
(Annex 4, Paragraph 1.8.), Flow rate test (Annex 4, Paragraph 1.10.) and Bench top
activation test (Annex 4, Paragraph 1.9.).
1.8. Leak Test
A TPRD that has not undergone previous testing is tested at ambient, high and low
temperatures without being subjected to other design qualification tests. The unit is held for one
hour at each temperature and test pressure before testing. The three temperature test
conditions are:
(a)
(b)
(c)
Ambient temperature: condition the unit at 20 (±5)°C; test at 5% NWP (+0/-2MPa) and
150% NWP (+2/-0MPa);
High temperature: condition the unit at 85°C or higher; test at 5% NWP (+0/-2MPa) and
150% NWP (+2/-0MPa);
Low temperature: condition the unit at -40°C or lower; test at 5% NWP (+0/-2MPa) and
100% NWP (+2/-0MPa).
Additional units undergo leak testing as specified in other tests in Annex 4, Paragraph 1. with
uninterrupted exposure at the temperature specified in those tests.
At all specified test temperatures, the unit is conditioned for one minute by immersion in a
temperature controlled fluid (or equivalent method). If no bubbles are observed for the specified
time period, the sample passes the test. If bubbles are detected, the leak rate is measured by
an appropriate method. The total hydrogen leak rate shall be less than 10Nml/hr.

2.1. Hydrostatic Strength Test
The outlet opening in components is plugged and valve seats or internal blocks are made to
assume the open position. One unit is tested without being subjected to other design
qualification tests in order to establish a baseline burst pressure, other units are tested as
specified in subsequent tests of Annex 4, Paragraph 2.
(a)
(b)
A hydrostatic pressure of 250% NWP (+2/-0MPa) is applied to the inlet of the component
for three minutes. The component is examined to ensure that rupture has not occurred;
The hydrostatic pressure is then increased at a rate of less than or equal to 1.4MPa/sec
until component failure. The hydrostatic pressure at failure is recorded. The failure
pressure of previously tested units shall be no less than 80% of the failure pressure of
the baseline, unless the hydrostatic pressure exceeds 400% NWP.
2.2. Leak Test
One unit that has not undergone previous testing is tested at ambient, high and low
temperatures without being subjected to other design qualification tests. The three temperature
test conditions are:
(a)
(b)
(c)
Ambient temperature: condition the unit at 20 (±5)°C; test at 5% NWP (+0/-2MPa) and
150% NWP (+2/-0MPa) ;
High temperature: condition the unit at 85°C or higher ; test at 5% NWP (+0/-2MPa) and
150% NWP (+2/-0MPa) ;
Low temperature: condition the unit at -40°C or lower; test at 5% NWP (+0/-2MPa) and
100% NWP (+2/-0MPa).
Additional units undergo leak testing as specified in other tests in Annex 4, Paragraph 2. with
uninterrupted exposure at the temperatures specified in those tests.
The outlet opening is plugged with the appropriate mating connection and pressurized
hydrogen is applied to the inlet. At all specified test temperatures, the unit is conditioned for
one minute by immersion in a temperature controlled fluid (or equivalent method). If no bubbles
are observed for the specified time period, the sample passes the test. If bubbles are detected,
the leak rate is measured by an appropriate method. The leak rate shall not exceed 10 Nml/hr
of hydrogen gas.

2.4. Salt Corrosion Resistance Test
The component is supported in its normally installed position and exposed for 500h to a salt
spray (fog) test as specified in ASTM B117 (Standard Practice for Operating Salt Spray (Fog)
Apparatus). The temperature within the fog chamber is maintained at 30 – 35°C). The saline
solution consists of 5% sodium chloride and 95% distilled water, by weight.
Immediately after the corrosion test, the sample is rinsed and gently cleaned of salt deposits,
examined for distortion, and then shall comply with the requirements of:
(a)
The component shall not show signs of physical degradation that could impair the
function of the component, specifically: cracking, softening or swelling. Cosmetic
changes such as pitting or staining are not failures;
(b)
The ambient temperature leak test (Annex 4, Paragraph 2.2.);
(c)
The hydrostatic strength test (Annex 4, Paragraph 2.1.).
2.5.
Vehicle Environment Test
Resistance to degradation by exposure to automotive fluids is determined by the following test.
(a)
The inlet and outlet connections of the valve unit are connected or capped in accordance
with the manufacturers installation instructions. The external surfaces of the valve unit
are exposed for 24h at 20 (±5)°C to each of the following fluids:
(i)
(ii)
(iii)
(iv)
Sulphuric acid -19% solution by volume in water;
Sodium hydroxide -25% solution by weight in water;
Ammonium nitrate -28% by weight in water; and
Windshield washer fluid (50% by volume methyl alcohol and water).
The fluids are replenished as needed to ensure complete exposure for the duration of
the test. A distinct test is performed with each of the fluids. One component may be used
for exposure to all of the fluids in sequence.
(b)
(c)
After exposure to each chemical, the component is wiped off and rinsed with water;
The component shall not show signs of physical degradation that could impair the
function of the component, specifically: cracking, softening, or swelling. Cosmetic
changes such as pitting or staining are not failures. At the conclusion of all exposures,
the unit(s) shall comply with the requirements of the ambient temperature leakage test
(Annex 4, Paragraph 2.2.) and Hydrostatic Strength Test (Annex 4, Paragraph 2.1.).

2.9. Stress Corrosion Cracking Test
For the valve units containing components made of a copper-based alloy (e.g. brass), one
valve unit is tested. The valve unit is disassembled, all copper-based alloy components are
degreased and then the valve unit is reassembled before it is continuously exposed for ten
days to a moist ammonia-air mixture maintained in a glass chamber having a glass cover.
Aqueous ammonia having a specific gravity of 0.94 is maintained at the bottom of the glass
chamber below the sample at a concentration of at least 20ml per litre of chamber volume. The
sample is positioned 35 (±5)mm above the aqueous ammonia solution and supported in an
inert tray. The moist ammonia-air mixture is maintained at atmospheric pressure at 35 (±5)°C.
Copper-based alloy components shall not exhibit cracking or delaminating due to this test.
2.10. Pre-cooled Hydrogen Exposure Test
The valve unit is subjected to pre-cooled hydrogen gas at -40°C or lower at a flow rate of
30g/sec at external temperature of 20 (±5)°C for a minimum of three minutes. The unit is depressurized
and re-pressurized after a two minute hold period. This test is repeated ten times.
This test procedure is then repeated for an additional ten cycles, except that the hold period is
increased to 15min. The unit shall then comply with the requirements of the ambient
temperature leak test specified in Annex 4, Paragraph 2.2.

ANNEX 4 – APPENDIX 2
OVERVIEW OF CHECK VALVE AND AUTOMATIC SHUT-OFF VALVE TESTS

The initial mass of hydrogen in the storage system is calculated as follows:
P ' = P × 288/(273 + T )
ρ ' = –0.0027 × (P ') + 0.75 × P ' + 0.5789
M = ρ ' × V
The final mass of hydrogen in the storage system, M , at the end of the time interval, ∆t, is
calculated as follows:
P' = P × 288/(273 + T )
ρ ' = –0.0027 × (P ') + 0.75 × P ' + 0.5789
M = ρ ' × V
where P is the measured final pressure (MPa) at the end of the time interval, and T is the
measured final temperature (°C).
The average hydrogen flow rate over the time interval (that shall be less than the criteria in
Paragraph 7.2.1.) is therefore
V = (M - M )/∆t × 22.41/2.016 × (P /P )
where V is the average volumetric flow rate (NL/min) over the time interval and the term
(P /P ) is used to compensate for differences between the measured initial pressure, P ,
and the targeted fill pressure P .
1.2. Post-crash Leak Test: Compressed Hydrogen Storage System Filled with Compressed
Helium
The helium gas pressure, P (MPa), and temperature T (°C), are measured immediately
before the impact and then at a predetermined time interval after the impact. The time interval,
∆t, starts when the vehicle comes to rest after the impact and continues for at least 60min. The
time interval, ∆t, shall be increased if necessary in order to accommodate measurement
accuracy for a storage system with a large volume operating up to 70MPa; in that case, ∆t is
calculated from the following equation:
∆t = V × NWP /1,000 × ((-0.028 × NWP +5.5) × R – 0.3) – 2.6 × R
where R = P /NWP, P is the pressure range of the pressure sensor (MPa), NWP is the
Nominal Working Pressure (MPa), V is the volume of the compressed storage system (L),
and ∆t is the time interval (min). If the value of ∆t is less than 60min, ∆t is set to 60min.
The initial mass of helium in the storage system is calculated as follows:
P ' = P × 288/(273 + T )
ρ ' = –0.0043 × (P ') + 1.53 × P ' + 1.49
M = ρ ' × V

The sensors are securely mounted on the vehicle structure or seats and protected for the
planned crash test from debris, air bag exhaust gas and projectiles. The measurements
following the crash are recorded by instruments located within the vehicle or by remote
transmission.
The vehicle may be located either outdoors in an area protected from the wind and possible
solar effects or indoors in a space that is large enough or ventilated to prevent the build-up of
hydrogen to more than 10% of the targeted criteria in the passenger and luggage
compartments.
Post-crash data collection in enclosed spaces commences when the vehicle comes to a rest.
Data from the sensors are collected at least every 5s and continue for a period of 60min after
the test. A first-order lag (time constant) up to a maximum of 5s may be applied to the
measurements to provide "smoothing" and filter the effects of spurious data points.
The filtered readings from each sensor shall be below the targeted criteria of 4.0% for hydrogen
or 3.0% for helium at all times throughout the 60min post-crash test period.
3. COMPLIANCE TEST FOR SINGLE FAILURE CONDITIONS
Either test procedure of Annex 5, Paragraph 3.1. or Paragraph 3.2. shall be executed:
3.1. Test procedure for Vehicle Equipped with Hydrogen Gas Leakage Detectors
3.1.1. Test Condition
3.1.1.1 Test vehicle: The propulsion system of the test vehicle is started, warmed up to its normal
operating temperature, and left operating for the test duration. If the vehicle is not a fuel cell
vehicle, it is warmed up and kept idling. If the test vehicle has a system to stop idling
automatically, measures are taken so as to prevent the engine from stopping.
3.1.1.2. Test gas: Two mixtures of air and hydrogen gas: 3.0% concentration (or less) of hydrogen in
the air to verify function of the warning, and 4.0% concentration (or less) of hydrogen in the air
to verify the shut-down function. The proper concentrations are selected based on the
recommendation (or the detector specification) by the manufacturer.
3.1.2. Test Method
3.1.2.1. Preparation for the test: The test is conducted without any influence of wind by appropriate
means such as:
(a)
(b)
A test gas induction hose is attached to the hydrogen gas leakage detector;
The hydrogen leak detector is enclosed with a cover to make gas stay around hydrogen
leak detector.

3.2.2.5. When testing for compliance with Paragraph 7.1.4.2. of this Regulation, the test is successfully
completed if the hydrogen concentration in the passenger compartment does not exceed 1.0%.
When testing for compliance with Paragraph 7.1.4.3. of this Regulation, the test is successfully
completed if the tell-tale warning and shut-off function are executed at (or below) the levels
specified in Paragraph 7.1.4.3. of this Regulation; otherwise, the test is failed and the system is
not qualified for vehicle service.
4. COMPLIANCE TEST FOR THE VEHICLE EXHAUST SYSTEM
4.1. The power system of the test vehicle (e.g. fuel cell stack or engine) is warmed up to its normal
operating temperature.
4.2. The measuring device is warmed up before use to its normal operating temperature.
4.3. The measuring section of the measuring device is placed on the centre line of the exhaust gas
flow within 100mm from the exhaust point of discharge external to the vehicle.
4.4. The exhaust hydrogen concentration is continuously measured during the following steps:
(a)
(b)
(c)
The power system is shut-down;
Upon completion of the shut-down process, the power system is immediately started;
After a lapse of one minute, the power system is turned off and measurement continues
until the power system shut-down procedure is completed.
4.5. The measurement device shall have a measurement response time of less than 300ms.
5. COMPLIANCE TEST FOR FUEL LINE LEAKAGE
5.1. The power system of the test vehicle (e.g. fuel cell stack or engine) is warmed up and operating
at its normal operating temperature with the operating pressure applied to fuel lines.
5.2. Hydrogen leakage is evaluated at accessible sections of the fuel lines from the high-pressure
section to the fuel cell stack (or the engine), using a gas leak detector or a leak detecting liquid,
such as soap solution.
5.3. Hydrogen Leak Detection is Performed Primarily at Joints
5.4. When a gas leak detector is used, detection is performed by operating the leak detector for at
least 10s at locations as close to fuel lines as possible.
5.5. When a leak detecting liquid is used, hydrogen gas leak detection is performed immediately
after applying the liquid. In addition, visual checks are performed a few minutes after the
application of liquid to check for bubbles caused by trace leaks.
6. INSTALLATION VERIFICATION
The system is visually inspected for compliance.
Hydrogen and Fuel Cell Vehicles (HFCV).