Outdoor hydrogen refuelling points dispensing gaseous hydrogen and incorporating filling protocols

This document defines the minimum requirements to ensure the interoperability of hydrogen refuelling points, including refuelling protocols that dispense gaseous hydrogen to road vehicles (e.g. Fuel Cell Electric Vehicles) that comply with legislation applicable to such vehicles.
The safety and performance requirements for the entire hydrogen fuelling station, addressed in accordance with existing relevant European and national legislation, are not included in this document.
NOTE Guidance on considerations for hydrogen fuelling stations is provided in ISO 19880-1.

Gasförmiger Wasserstoff - Betankungsanlagen - Teil 1: Allgemeine Anforderungen

Points de ravitaillement en hydrogène en extérieur distribuant de l'hydrogène gazeux et intégrant des protocoles de remplissage

Le présent document définit les exigences minimales permettant de garantir l'interopérabilité des points de ravitaillement en hydrogène intégrant les protocoles de remplissage qui distribuent de l'hydrogène gazeux pour les véhicules routiers (par exemple, les véhicules électriques à pile à combustible) qui sont conformes à la législation applicable à ces véhicules.
Les exigences de sécurité et de performances relatives à toute la station de remplissage d'hydrogène, traitées conformément à la législation européenne et nationale, ne sont pas incluses dans le présent document.
NOTE Les recommandations relatives aux considérations concernant les stations de remplissage d'hydrogène sont fournies dans l'ISO 19880-1:2020.

Zunanje polnilne postaje za plinasti vodik in postopki polnjenja

General Information

Status
Published
Public Enquiry End Date
02-Apr-2020
Publication Date
11-Jan-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Jan-2021
Due Date
12-Mar-2021
Completion Date
12-Jan-2021

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SLOVENSKI STANDARD
SIST EN 17127:2021
01-februar-2021
Nadomešča:
SIST EN 17127:2019
Zunanje polnilne postaje za plinasti vodik in postopki polnjenja
Outdoor hydrogen refuelling points dispensing gaseous hydrogen and incorporating
filling protocols
Gasförmiger Wasserstoff - Betankungsanlagen - Teil 1: Allgemeine Anforderungen
Points de ravitaillement en hydrogène en extérieur distribuant de l'hydrogène gazeux et
intégrant des protocoles de remplissage
Ta slovenski standard je istoveten z: EN 17127:2020
ICS:
27.075 Tehnologija vodika Hydrogen technologies
71.100.20 Industrijski plini Gases for industrial
application
SIST EN 17127:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17127:2021

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SIST EN 17127:2021


EN 17127
EUROPEAN STANDARD

NORME EUROPÉENNE

November 2020
EUROPÄISCHE NORM
ICS 27.075; 71.100.20; 75.200 Supersedes EN 17127:2018
English Version

Outdoor hydrogen refuelling points dispensing gaseous
hydrogen and incorporating filling protocols
Points de ravitaillement en hydrogène en extérieur Gasförmiger Wasserstoff - Betankungsanlagen - Teil 1:
distribuant de l'hydrogène gazeux et intégrant des Allgemeine Anforderungen
protocoles de remplissage
This European Standard was approved by CEN on 18 October 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17127:2020 E
worldwide for CEN national Members.

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SIST EN 17127:2021
EN 17127:2020 (E)
Contents Page

European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Abbreviated terms . 8
5 Characteristics and properties of hydrogen refuelling points . 9
5.1 General requirements . 9
5.2 Fuel Quality . 9
5.3 Dispenser process control . 10
5.3.1 General requirements for the fuelling protocol. 10
5.3.2 Fuelling protocol process limits for light duty vehicle dispensing systems . 10
5.3.3 Fuelling protocol process limits for medium and heavy duty vehicle dispensing
systems . 11
5.3.4 Vehicle to station communications . 12
5.3.5 Dispenser Pressure Control Faults and over-pressure protection . 12
5.3.6 Dispenser temperature control faults . 13
6 Inspection and validation of hydrogen refuelling points . 13
6.1 Inspection prior putting into service and periodical inspection . 13
6.2 Minimum Site Acceptance Testing to ensure interoperability . 14
Annex A (informative) Anticipated minimum vehicle characteristics . 16
Annex B (informative) Countermeasures for unsuitable hydrogen fuelling protocols . 18
Bibliography . 19


2

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SIST EN 17127:2021
EN 17127:2020 (E)
European foreword
This document (EN 17127:2020) has been prepared by Technical Committee CEN/TC 268 “Cryogenic
vessels and specific hydrogen technologies applications”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2021, and conflicting national standards shall be
withdrawn at the latest by May 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 17127:2018.
Compared to the previous version, the following changes apply:
— Improvement of the definitions;
— The general requirements of the characteristics and properties of hydrogen refuelling points have
   been completed to provide more information;
— Clarification of the fuelling protocols;
— Revision of the acceptable test for the minimum SAT to ensure interoperability;
— Correction of Figure A.1.
This document has been prepared under Mandate M/533 given to CEN by the European Commission and
the European Free Trade Association.
It applies to hydrogen refuelling points dispensing gaseous hydrogen to vehicles compliant with GTR13,
UNECE R134 or Regulation (EC) No 79/2009.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom

3

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SIST EN 17127:2021
EN 17127:2020 (E)
Introduction
The European Commission in its standardization request M/533 of March 12th, 2015, aims to ensure that
technical specifications for interoperability of refuelling points are specified in European Standards
compatible with the relevant International Standards. These specifications aim to meet the European
needs, be compatible and aligned as much as possible with relevant International Standards and as far as
possible with existing refuelling infrastructure already in place and leave room to accommodate the
adopted standard to local technical, analytical and regulatory needs. The requested European Standards
aim to be technologically and commercially neutral and based on the know-how currently in possession
of the EU industry and of the public sector on a fair, reasonable and non-discriminatory basis.
According to the legal requirements given in the Alternative Fuels Infrastructure Directive (AFID) and
M/533, European Standards specifying only the required specifications for ensuring the interoperability
of refuelling points have to be provided. European standards and common requirements with respect to
“interoperability” mean the capacity of an infrastructure to supply energy (in this document hydrogen)
that is compatible with all vehicle technologies and allows seamless EU-wide mobility and a clear
definition of fuel pressure and temperature levels and connector designs.
The European Standardization Organizations (ESOs) should adopt European Standards in accordance
with Article 10 of Regulation (EU) No 1025/2012 of the European Parliament and of the Council, and
those standards should be based on current International Standards or ongoing international
standardization work, where applicable.
Direction from the standardization request M/533 for European Standards for hydrogen supply are to
develop European Standards containing technical solutions for interoperability with technical specifications
in regard to Article 5 and point 2 of Annex II, in particular for:
a) outdoor hydrogen refuelling points dispensing gaseous hydrogen;
b) hydrogen purity dispensed by hydrogen refuelling points;
c) fuelling algorithms and equipment of hydrogen refuelling points;
d) connectors for vehicles for the refuelling of gaseous hydrogen.
This document specifies Items a) and c).
Item b) is covered by EN 17124 and Item d) by EN ISO 17268.
4

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SIST EN 17127:2021
EN 17127:2020 (E)
1 Scope
This document defines the minimum requirements to ensure the interoperability of hydrogen refuelling
points, including refuelling protocols that dispense gaseous hydrogen to road vehicles (e.g. Fuel Cell
Electric Vehicles) that comply with legislation applicable to such vehicles.
The safety and performance requirements for the entire hydrogen fuelling station, addressed in
accordance with existing relevant European and national legislation, are not included in this document.
NOTE Guidance on considerations for hydrogen fuelling stations is provided in ISO 19880-1:2020.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 17124, Hydrogen fuel — Product specification and quality assurance — Proton exchange membrane
(PEM) fuel cell applications for road vehicles
EN ISO 17268, Gaseous hydrogen land vehicle refuelling connection devices (ISO17268)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
NOTE Units used in this document follow SI (International System of Units).
3.1
compressed hydrogen storage system
CHSS
hydrogen storage on-board vehicle, as defined in the GTR#13 and UNECE R134
3.2
dispenser
equipment in the dispensing system, including the dispenser cabinet(s) and support structure, that is
physically located in the fuelling area
Note 1 to entry: The hydrogen dispenser typically includes, as a minimum, the fuelling assembly, required
temperature and pressure instrumentation, filters, and the user interface to conduct vehicle fuelling.
Note 2 to entry: The manufacturer of the hydrogen dispenser can elect to include additional equipment in the
dispenser, including the possibility of all equipment in the dispensing system.
3.3
dispenser cabinet
protective housing that encloses process piping and can also enclose measurement, control and ancillary
dispenser equipment
5

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SIST EN 17127:2021
EN 17127:2020 (E)
3.4
dispenser fuel pressure
pressure of the hydrogen gas supplied to the vehicle by the refuelling point
Note 1 to entry: See Annex A for discussion of pressure terminology and its application to dispensing systems.
3.5
dispenser fuel temperature
temperature of the hydrogen gas supplied to the vehicle by the refuelling point
3.6
dispensing system
system downstream of the hydrogen supply system comprising all equipment necessary to carry out the
vehicle refuelling operation, through which the compressed hydrogen is supplied to the vehicle
3.7
hydrogen fuelling station
facility for the dispensing of compressed hydrogen vehicle fuel, often referred to as a hydrogen refuelling
station (HRS) or hydrogen filling station, including the supply of hydrogen compression, storage and
dispensing systems
3.8
hydrogen service level
HSL
pressure level in MPa used to characterize the hydrogen service of the dispenser based on the NWP rating
of the vehicle
Note 1 to entry: The numerical value of HSL also matches the number after the “H” in Pressure Class.
Note 2 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
3.9
interoperability
capability of a hydrogen dispensing point to supply hydrogen at the fuelling station/vehicle interface that
is compatible with road vehicles and allows seamless EU-wide mobility through applying clear definitions
of connector designs, fuel quality, pressure levels, temperatures and other applicable considerations
3.10
maximum allowable working pressure
MAWP
maximum pressure permissible in a vessel or system at the temperature specified for the pressure
Note 1 to entry: The maximum allowable working pressure may also be defined as the design pressure, the
maximum allowable operating pressure, the maximum permissible working pressure, or the maximum allowable
pressure for the rating of pressure vessels and equipment manufactured in accordance with national pressure
vessel codes.
Note 2 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
3.11
maximum/minimum allowable temperature
TS
values of the maximum/minimum temperatures at which safe and good functioning of the component is
ensured and for which it has been designed, as specified by the manufacturer
6

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SIST EN 17127:2021
EN 17127:2020 (E)
3.12
maximum developed pressure
MDP
highest pressure expected during fault management by the dispensing system
Note 1 to entry: Per the GTR, the maximum developed pressure is 1,50 × NWP.
Note 2 to entry: The estimate of maximum developed pressure is based on a “worst case” assumptions — the
highest possible setpoint for the pressure protection and maximum allowable values for setpoint accuracy and “lift”
to open the PSV for full relieving.
3.13
maximum fuelling pressure
MFP
maximum pressure applied to the vehicle high pressure hydrogen system during refuelling. The
maximum fuelling pressure is 125 per cent of the Nominal Working Pressure
Note 1 to entry: See GTR#13 Clause II-3.36, on Page 54.
Note 2 to entry: Also referred to as Maximum fill pressure.
3.14
maximum operating pressure
MOP
highest pressure that is expected for a component or system during normal operation
Note 1 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
3.15
nominal working pressure
NWP
pressure of a-vehicle CHSS at 100% SOC at a gas temperature of 15 °C
Note 1 to entry: See GTR#13 Clause II-3.37, on Page 54.
Note 2 to entry: For road vehicles, this is typically 35 MPa or 70 MPa.
Note 3 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
3.16
pressure class
non-dimensional rating of components that indicates the components are designed to dispense hydrogen
to road vehicles at the required pressure and temperature
Note 1 to entry: The numbers following ‘H’ in the pressure class are numerically the same as HSL, but the HSL
identifies only the level of the dispensing service whereas the pressure class designation shows the component are
fully capable of meeting the pressure and temperature requirements for dispensing hydrogen at the indicated
service level.
Note 2 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
7

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SIST EN 17127:2021
EN 17127:2020 (E)
3.17
Pressure safety valve
PSV
pressure activated valve that opens at specified set point to protect a system from rupture and re-closes
when the pressure falls below the set point. PSVs protecting the dispensing system can reclose above the
MOP
3.18
refuelling protocol
automated process to ensure safe filling of vehicles, called refuelling algorithms in the Alternative Fuel
Infrastructure Directive (2014/94/EU)
3.19
state of charge
SOC
density (or mass) ratio of hydrogen in the compressed hydrogen storage system (CHSS) between the
actual CHSS condition and the capacity at NWP when the system is equilibrated at 15 °C
Note 1 to entry: SOC is expressed as a percentage and is computed based on the gas density according to formula
below.
Note 2 to entry: The accuracy of the NIST formula has been quantified to be to within 0,01 % from 255 K to
1 000 K with pressures to 120 MPa at the publishing of this document.
ρ PT,
( )
SOC % ×100
( )
ρ NWP,15 °C
( )
(1)
The hydrogen densities at the two major nominal working pressures are:
— density of H2 at 35 MPa and 15 °C = 24,0 g/l;
at 70 MPa and 15 °C = 40,2 g/l
— density of H2
Note 3 to entry: The ρ(P,T) function for hydrogen is available from the National Institute of Standards and
Technology (NIST) at https://nvlpubs.nist.gov/nistpubs/jres/113/6/V113.N06.A05.pdf
3.20
target pressure
dispenser fuel pressure that the hydrogen fuelling protocol targets for the end of refuelling
4 Abbreviated terms
H35 Indication for 35 MPa NWP hydrogen refuelling as defined in EN ISO 17268
H70 Indication for 70 MPa NWP hydrogen refuelling as defined in EN ISO 17268
8
=

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SIST EN 17127:2021
EN 17127:2020 (E)
5 Characteristics and properties of hydrogen refuelling points
5.1 General requirements
The hydrogen refuelling point shall be able to refuel hydrogen vehicles certified according to
UNECE R134 or Regulation (EC) No 79/2009 without compromising their specification limits.
NOTE 1 Assumptions made on the minimum characteristics of the hydrogen vehicle necessary to ensure
interoperability with the refuelling points defined in this document are outlined in Annex A.
Hydrogen refuelling points that would potentially be harmful to vehicles compliant with UNECE R134 or
Regulation (EC) No 79/2009 (for example, due to the protocol used) should use countermeasures to
prevent unsafe refuelling from occurring.
NOTE 2 Examples of countermeasures that can be employed to prevent vehicles refuelling at refuelling points
where the protocol could be unsafe for vehicles compliant with UNECE R134 or Regulation (EC) No 79/2009 are
provided in Annex B.
Refuelling points shall provide hydrogen at either H35 and/or H70 (relating to an NWP in the vehicle of
35 MPa and 70 MPa respectively) via appropriately rated components.
The refuelling nozzle shall be compatible with vehicle hydrogen receptacles that comply with
EN ISO 17268.
Instructions for use of the hydrogen refuelling point by the general public shall be included on or in the
vicinity of each dispenser. The fuel (i.e. hydrogen) and pressure class shall be clearly indicated. Dispenser
operation instructions for dispensing hydrogen into a vehicle may be displayed as markings or as an
electronic display at the dispenser.
These instructions shall include prohibitions against:
— the use of adapters (e.g. 35 MPa vehicle refuelling from 70 MPa nozzle, or alternative fuel nozzles);
— the refuelling of cylinder systems (whether in a vehicle or not) that are incompatible with the fuelling
protocol employed at the refuelling point, see 5.3.
NOTE 3 EN 16942 includes information on labelling requirements for hydrogen refuelling points, and hydrogen
vehicles, in Europe
5.2 Fuel Quality
The hydrogen quality at the nozzle shall meet the requirements of EN 17124.
To prevent hydrogen containing function-impairing impurities (i.e. particulates) that would affect the
high pressure hydrogen system of the vehicle, specifically the vehicle CHSS valves, hydrogen filters shall
be included as part of the dispenser. There shall be a filter with a capability to prevent particulates of a
maximum size of 5 µm with a minimum removal efficiency of 99 % under expected process conditions,
or alternatively a 5 µm filter. The filter shall be installed downstream of dispenser components which
could create particulates, such as a heat exchanger, flow controller, valves, etc. and be as close as possible
to the nozzle or hose breakaway device. This shall filter out the particulate concentration in the hydrogen
as per EN 17124.
All filters located at the nearest side to the nozzle shall be carefully selected by taking the robustness into
account (for example the durability limitations of powdered sintered metal filters).
EN ISO 4022, ISO 12500-1 and ISO 12500-3 provide recommended methodologies for the testing of filter
efficiencies.
9

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SIST EN 17127:2021
EN 17127:2020 (E)
5.3 Dispenser process control
5.3.1 General requirements for the fuelling protocol
In order to ensure that the refuelling is conducted within the fuelling protocol process limits for vehicle
compressed hydrogen storage systems, as defined in 5.3.2 or 5.3.3 as applicable, hydrogen dispensing
systems shall either:
— use an approved published fuelling protocol developed by a recognized standards development
organization (SDO), such as SAE J2601
or
— use protocols that have been approved by the manufacturers of each vehicle to fuel at that refuelling
point using that protocol and by regulatory authorities when appropriate. The fuelling station
operator shall take measures to prevent the refuelling of vehicles at a refuelling point where
protocols are not approved by the manufacturer(s) of the vehicles using that refuelling point.
NOTE Examples of countermeasures that can be employed to prevent vehicles fuelling at refuelling points
where the fuelling protocol has not been approved are provided in Annex B.
The fuelling protocol shall ensure, directly or indirectly, that the maximum CHSS material temperature
does not exceed 85 °C throughout the refuelling.
The fuelling protocol shall consider the possible range of temperatures of the CHSS of the vehicle prior to
refuelling as well as the full range of ambient temperatures when establishing the refuelling rates, to
ensure that the storage system on the vehicle does not inadvertently experience an over-fill or over-
temperature condition.
If necessary, the fuelling protocol shall adjust the refuelling rate and target pressure based on measured
ambient and process conditions, such as dispensed hydrogen gas temperature and pressure, to ensure
that the process limits listed in 5.3.2 and 5.3.3 below are maintained for the vehicle. If these conditions
cannot be maintained within the limits, the refuelling shall cease.
The fuelling protocol should be appropriate for the range of vehicle tank capacities that are intended to
be refuelled.
Measures should be taken to ensure that sequential refuelling of the same vehicle does not lead to an
unsafe situation, for example using different fuelling protocols, at different fuel temperatures.
The dispensing system may either conduct the refuelling using communication with the vehicle as part
of the refuelling process (see 5.3.4) or conduct the fuelling protocol without communications with the
vehicle. The fuelling protocol may have provisions for both communication and non-communications
fuellings.
The fuelling protocol shall include a leak check of the fuel hose, hose breakaway device, nozzle and
connection to the vehicle before refuelling. The leak check shall be carried out while the vehicle is
connected. The refuelling shall be stopped in the event of leak detection above the acceptable limit.
5.3.2 Fuelling protocol process limits for light duty vehicle dispensing systems
Hydrogen refuelling points shall be designed to fuel vehicles compliant with UNECE R134 or
Regulation (EC) No 79/2009 (see Annex A for relevant limits based on assumptions made about the
vehicle being refuelled) by fulfilling the requirements of this subclause. Refuelling points using fuelling
protocols that could potentially be unsafe for such vehicles shall incorporate appropriate
countermeasures.
10

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SIST EN 17127:2021
EN 17127:2020 (E)
NOTE 1 Examples of countermeasures that can be employed to prevent vehicles refuelling at refuelling points
where the fuelling protocol could be unsafe for UNECE R134 or Regulation (EC) No 79/2009 vehicles are provided
in Annex B.
The refuelling of vehicles not compliant with the UNECE R134 or Regulation (EC) No 79/2009 should be
addressed by risk assessment and, if necessary, the fuelling protocol process limits defined in this chapter
should be revised accordingly.
The fuelling protocol shall ensure the following:
During the refuelling process, the refuelling point dispensing system shall meet the following fuelling
protocol limits, or terminate the refuelling within 5 s:
— ambient temperature no less than −40 °C and no greater than +50 °C;
— dispenser fuel pressure less than the maximum operating pressure (MOP), see 5.3.5;
NOTE 2 See 5.3.5 for over-pressure protection measures if a fault occurs.
— dispenser fuel temperature greater than −40 °C;
— fuel flow rate less than 60 g/s (excluding momentary excursions during the initial connection
sequence - i.e. connecting the nozzle to the receptacle prior to the start of refuelling and/or the pulse
of hydrogen from the dispenser to the vehicle in order to equalize the station pressure with that of
the vehicle to carry out the pressure integrity check before refuelling and to establish the initial
pressure);
— where communications are used, a communicated CHSS temperature less than 85 °C;
— a maximum of 10 pauses during refuelling where the fuel flow rate drops below 0,6 g/s.
Additionally, the dispensing system shall also terminate the refuelling within 5 s if any of the following
events occur:
— where communications are used, an abort or halt signal is received from the vehicle being refuelled;
— any deviations from the fuelling protocol (see 5.3.1) arise.
As part of the fuelling protocol, a quantity of hydrogen may be transferred to the vehicle to determine the
start pressure prior to the start of refuelling:
— the maximum hydrogen mass allowed to be transferred to the vehicle during this process should be
200 g;
— dispensing systems shall not fuel a vehicle which has a pressure lower than 0,5 MPa or a pressure
greater than the appropriate vehicle NWP (i.e. 35 MPa or 70 MPa) after this process.
Following refuelling, the vehicle state of charge should not exceed 100 %.
The above limits shall also be considered as part of the dispenser risk assessment, with the possibility
that additional countermeasures (beyond normal termination of the refuelling) may be required to
prevent these limits from being exceeded.
5.3.3 Fuelling protocol process limits for medium and heavy duty vehicle dispensing systems
Where hydrogen refuelling points are designed to fuel medium or heavy duty vehicles, the requirements
for 5.3.2 shall be met, with the following exception:
11

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SIST EN 17127:2021
EN 17127:2020 (E)
— when the dispenser has a high flow nozzle, see EN ISO 17268, which prevents connection to a
standard vehicle receptacle (i.e. non high flow receptacle), the maximum fuel flow rate (excluding
momentary excursions during the initial connection sequence - i.e. connecting the nozzle to the
receptacle prior to the start of refuelling) may exceed 60 g/s where both the refuelling point and the
vehicle are designed for the higher flow rate.
Countermeasures shall be included to prevent vehicles that are not suitab
...

SLOVENSKI STANDARD
oSIST prEN 17127:2020
01-marec-2020
Zunanje polnilne postaje za plinasti vodik in postopki polnjenja
Outdoor hydrogen refuelling points dispensing gaseous hydrogen and incorporating
filling protocols
Gasförmiger Wasserstoff - Betankungsanlagen - Teil 1: Allgemeine Anforderungen
Points de ravitaillement en hydrogène en extérieur distribuant de l'hydrogène gazeux et
intégrant des protocoles de remplissage
Ta slovenski standard je istoveten z: prEN 17127
ICS:
27.075 Tehnologija vodika Hydrogen technologies
71.100.20 Industrijski plini Gases for industrial
application
oSIST prEN 17127:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17127:2020

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oSIST prEN 17127:2020


DRAFT
EUROPEAN STANDARD
prEN 17127
NORME EUROPÉENNE

EUROPÄISCHE NORM

February 2020
ICS 27.075; 71.100.20; 75.200 Will supersede EN 17127:2018
English Version

Outdoor hydrogen refuelling points dispensing gaseous
hydrogen and incorporating filling protocols
Points de ravitaillement en hydrogène en extérieur Gasförmiger Wasserstoff - Betankungsanlagen - Teil 1:
distribuant de l'hydrogène gazeux et intégrant des Allgemeine Anforderungen
protocoles de remplissage
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 268.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17127:2020 E
worldwide for CEN national Members.

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Contents Page

European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Abbreviated terms . 9
5 Characteristics and properties of hydrogen refuelling points . 9
5.1 General requirements . 9
5.2 Fuel Quality . 10
5.3 Dispenser process control . 10
5.3.1 General requirements for the fuelling protocol. 10
5.3.2 Fuelling protocol process limits for light duty vehicle dispensing systems . 11
5.3.3 Fuelling protocol process limits for medium and heavy duty vehicle dispensing
systems . 12
5.3.4 Vehicle to station communications . 12
5.3.5 Dispenser Pressure Control Faults and over-pressure protection . 13
5.3.6 Dispenser temperature control faults . 13
6 Inspection and validation of hydrogen refuelling points . 14
6.1 Inspection prior putting into service and periodical inspection . 14
6.2 Minimum Site Acceptance Testing to ensure interoperability . 14
Annex A (informative) Anticipated minimum vehicle characteristics . 16
Annex B (informative) Countermeasures for unsuitable hydrogen fuelling protocols . 18
B.1 General . 18
B.2 Countermeasure examples . 18
Bibliography . 19


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European foreword
This document (prEN 17127:2020) has been prepared by Technical Committee CEN/TC 268 “Cryogenic
vessels and specific hydrogen technologies applications”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 17127:2018.
This document has been prepared under Mandate M/533 given to CEN by the European Commission and
the European Free Trade Association.
It applies to hydrogen refuelling points dispensing gaseous hydrogen to vehicles compliant with GTR13,
UNECE R134 or Regulation (EC) No 79/2009.
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Introduction
The European Commission in its standardization request M/533 of March 12th, 2015, aims to ensure that
technical specifications for interoperability of refuelling points are specified in European Standards
compatible with the relevant International Standards. These specifications aim to meet the European
needs, be compatible and aligned as much as possible with relevant International Standards and as far as
possible with existing refuelling infrastructure already in place and leave room to accommodate the
adopted standard to local technical, analytical and regulatory needs. The requested European Standards
aim to be technologically and commercially neutral and based on the know-how currently in possession
of the EU industry and of the public sector on a fair, reasonable and non-discriminatory basis.
According to the legal requirements given in the Alternative Fuels Infrastructure Directive (AFID) and
M/533, European Standards specifying only the required specifications for ensuring the interoperability
of refuelling points have to be provided. European standards and common requirements with respect to
“interoperability” mean the capacity of an infrastructure to supply energy (in this document hydrogen)
that is compatible with all vehicle technologies and allows seamless EU-wide mobility and a clear
definition of fuel pressure and temperature levels and connector designs.
The European Standardization Organizations (ESOs) should adopt European Standards in accordance
with Article 10 of Regulation (EU) No 1025/2012 of the European Parliament and of the Council, and
those standards should be based on current International Standards or ongoing international
standardization work, where applicable.
Direction from the standardization request M/533 for European Standards for hydrogen supply are to
develop European Standards containing technical solutions for interoperability with technical specifications
in regard to Article 5 and point 2 of Annex II, in particular for:
a) outdoor hydrogen refuelling points dispensing gaseous hydrogen;
b) hydrogen purity dispensed by hydrogen refuelling points;
c) fuelling algorithms and equipment of hydrogen refuelling points;
d) connectors for vehicles for the refuelling of gaseous hydrogen.
This document specifies Items a) and c).
Item b) is covered by EN 17124 and Item d) by EN ISO 17268.
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1 Scope
This document defines the minimum requirements to ensure the interoperability of hydrogen refuelling
points, including refuelling protocols that dispense gaseous hydrogen to road vehicles (e.g. Fuel Cell
Electric Vehicles) that comply with legislation applicable to such vehicles.
The safety and performance requirements for the entire hydrogen fuelling station, addressed in
accordance with existing relevant European and national legislation, are not included in this document.
NOTE Guidance on considerations for hydrogen fuelling stations is provided in ISO 19880-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 17124, Hydrogen fuel - Product specification and quality assurance - Proton exchange membrane (PEM)
fuel cell applications for road vehicles
EN ISO 17268, Gaseous hydrogen land vehicle refuelling connection devices (ISO 17268)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
NOTE Units used in this document follow SI (International System of Units).
3.1
compressed hydrogen storage system
CHSS
hydrogen storage on-board vehicle, as defined in the GTR#13
3.2
hydrogen fuelling station
facility for the dispensing of compressed hydrogen vehicle fuel, often referred to as a hydrogen refuelling
station (HRS) or hydrogen filling station, including the supply of hydrogen compression, storage and
dispensing systems
3.3
interoperability
capability of a hydrogen dispensing point to supply hydrogen at the fuelling station/vehicle interface that
is compatible with road vehicles and allows seamless EU-wide mobility through applying clear definitions
of connector designs, fuel quality, pressure levels, temperatures and other applicable considerations
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3.4
maximum allowable working pressure
MAWP
maximum pressure permissible in a vessel or system at the temperature specified for the pressure
Note 1 to entry: The maximum allowable working pressure may also be defined as the design pressure, the
maximum allowable operating pressure, the maximum permissible working pressure, or the maximum allowable
pressure for the rating of pressure vessels and equipment manufactured in accordance with national pressure
vessel codes.
Note 2 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
3.5
maximum/minimum allowable temperature
TS
values of the maximum/minimum temperatures at which safe and good functioning of the component is
ensured and for which it has been designed, as specified by the manufacturer
3.6
maximum operating pressure
MOP
highest pressure that is expected for a component or system during normal operation
Note 1 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
3.7
nominal working pressure
NWP
pressure of a-vehicle CHSS at 100% SOC at a gas temperature of 15 °C
Note 1 to entry: See GTR13 Clause II-3.37, on Page 54.
Note 2 to entry: For road vehicles, this is typically 35 MPa or 70 MPa.
Note 3 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
3.8
refuelling protocol
automated process to ensure safe filling of vehicles, called refuelling algorithms in the Alternative Fuel
Infrastructure Directive (2014/94/EU)
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3.9
state of charge
SOC
density (or mass) ratio of hydrogen in the compressed hydrogen storage system (CHSS) between the
actual CHSS condition and the capacity at NWP when the system is equilibrated at 15 °C
Note 1 to entry: SOC is expressed as a percentage and is computed based on the gas density according to formula
below.
Note 2 to entry: The accuracy of the NIST formula has been quantified to be to within 0,01 % from 255 K to 1 000 K
with pressures to 120 MPa at the publishing of this document.
ρ PT,
( )
SOC % ×100
( )
ρ NWP,15 °C
( )
(1)
The hydrogen densities at the two major nominal working pressures are:
— density of H2 at 35 MPa and 15 °C = 24,0 g/l;
— density of H at 70 MPa and 15 °C = 40,2 g/l
2
Note 3 to entry: The ρ(P,T) function for hydrogen is available from the National Institute of Standards and
Technology (NIST) at http://www.boulder.nist.gov/div838/Hydrogen/PDFs/Lemmon.2008.pV113.N06.A05.pdf
3.10
hydrogen service level
HSL
pressure level in MPa used to characterize the hydrogen service of the dispenser based on the NWP rating
of the vehicle
Note 1 to entry: The numerical value of HSL also matches the number after the “H” in Pressure Class.
Note 2 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
3.11
pressure class
non-dimensional rating of components that indicates the components are designed to dispense hydrogen
to road vehicles at the required pressure and temperature
Note 1 to entry: The numbers following ‘H’ in the pressure class are numerically the same as HSL, but the HSL
identifies only the level of the dispensing service whereas the pressure class designation shows the component are
fully capable of meeting the pressure and temperature requirements for dispensing hydrogen at the indicated
service level.
Note 2 to entry: See Annex A for application of pressure terminology to hydrogen dispenser systems and vehicles.
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3.12
maximum fuelling pressure
MFP
maximum pressure applied to the vehicle high pressure hydrogen system during refuelling. The
maximum fuelling pressure is 125 per cent of the Nominal Working Pressure
Note 1 to entry: See GTR#13 Clause II-3.36, on Page 54.
Note 2 to entry: Also referred to as Maximum fill pressure.
3.13
target pressure
dispenser fuel pressure that the hydrogen fuelling protocol targets for the end of refuelling
3.14
dispensing system
system downstream of the hydrogen supply system comprising all equipment necessary to carry out the
vehicle refuelling operation, through which the compressed hydrogen is supplied to the vehicle
3.15
dispenser fuel pressure
pressure of the hydrogen gas supplied to the vehicle by the refuelling point
Note 1 to entry: See Annex A for discussion of pressure terminology and its application to dispensing systems.
3.16
dispenser fuel temperature
temperature of the hydrogen gas supplied to the vehicle by the refuelling point
3.17
dispensing system MAWP
minimum value of induvial component MAWP
3.18
dispenser
equipment in the dispensing system, including the dispenser cabinet(s) and support structure, that is
physically located in the fuelling area
Note 1 to entry: The hydrogen dispenser typically includes, as a minimum, the fuelling assembly, required
temperature and pressure instrumentation, filters, and the user interface to conduct vehicle fuelling.
Note 2 to entry: The manufacturer of the hydrogen dispenser can elect to include additional equipment in the
dispenser, including the possibility of all equipment in the dispensing system.
3.19
dispenser cabinet
protective housing that encloses process piping and can also enclose measurement, control and ancillary
dispenser equipment
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3.20
dispenser
equipment in the dispensing system, including the dispenser cabinet(s) and support structure, that is
physically located in the fuelling area
Note 1 to entry: The hydrogen dispenser typically includes, as a minimum, the fuelling assembly, required
temperature and pressure instrumentation, filters, and the user interface to conduct vehicle fuelling.
Note 2 to entry: The manufacturer of the hydrogen dispenser can elect to include additional equipment in the
dispenser, including the possibility of all equipment in the dispensing system.
3.21
dispenser cabinet
protective housing that encloses process piping and can also enclose measurement, control and ancillary
dispenser equipment
4 Abbreviated terms
H35 Indication for 35 MPa NWP hydrogen refuelling as defined in EN ISO 17268
H70 Indication for 70 MPa NWP hydrogen refuelling as defined in EN ISO 17268
5 Characteristics and properties of hydrogen refuelling points
5.1 General requirements
The hydrogen refuelling point shall be able to refuel hydrogen vehicles certified according to
UNECE R134 or Regulation (EC) No 79/2009 without compromising their specification limits.
NOTE 1 Assumptions made on the minimum characteristics of the hydrogen vehicle necessary to ensure
interoperability with the refuelling points defined in this document are outlined in Annex A.
Hydrogen refuelling points that would potentially be harmful to vehicles compliant with UNECE R134 or
Regulation (EC) No 79/2009 (for example, due to the protocol used) should use countermeasures to
prevent unsafe refuelling from occurring.
NOTE 2 Examples of countermeasures that can be employed to prevent vehicles refuelling at refuelling points
where the protocol could be unsafe for vehicles compliant with UNECE R134 or Regulation (EC) No 79/2009 are
provided in Annex B.
Refuelling points shall provide hydrogen at either H35 and/or H70 (relating to an NWP in the vehicle of
35 MPa and 70 MPa respectively) via appropriately rated components.
The refuelling nozzle shall be compatible with vehicle hydrogen receptacles that comply with
EN ISO 17268.
Instructions for use of the hydrogen refuelling point by the general public shall be included on or in the
vicinity of each dispenser. The fuel (i.e. hydrogen) and pressure class shall be clearly indicated. Dispenser
operation instructions for dispensing hydrogen into a vehicle may be displayed as markings or as an
electronic display at the dispenser.
These instructions shall include prohibitions against:
— the use of adapters (e.g. 35 MPa vehicle refuelling from 70 MPa nozzle, or alternative fuel nozzles);
— the refuelling of cylinder systems (whether in a vehicle or not) that are incompatible with the fuelling
protocol employed at the refuelling point, see 5.3.
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NOTE 3 EN 16942 includes information on labelling requirements for hydrogen refuelling points, and hydrogen
vehicles, in Europe
5.2 Fuel Quality
The hydrogen quality at the nozzle shall meet the requirements of EN 17124.
To prevent hydrogen containing function-impairing impurities (i.e. particulates) that would affect the
high pressure hydrogen system of the vehicle, specifically the vehicle CHSS valves, hydrogen filters shall
be included as part of the dispenser. There shall be a filter with a capability to prevent particulates of a
maximum size of 5 µm with a minimum removal efficiency of 99 % under expected process conditions,
or alternatively a 5 µm filter. The filter shall be installed downstream of dispenser components which
could create particulates, such as a heat exchanger, flow controller, valves, etc. and be as close as possible
to the nozzle or hose breakaway device. This shall filter out the particulate concentration in the hydrogen
as per EN 17124.
All filters located at the nearest side to the nozzle shall be carefully selected by taking the robustness into
account (for example the durability limitations of powdered sintered metal filters).
EN ISO 4022, ISO 12500-1 and ISO 12500-3 provide recommended methodologies for the testing of filter
efficiencies.
5.3 Dispenser process control
5.3.1 General requirements for the fuelling protocol
In order to ensure that the refuelling is conducted within the fuelling protocol process limits for vehicle
compressed hydrogen storage systems, as defined in 5.3.2 or 5.3.3 as applicable, hydrogen dispensing
systems shall either:
— use an approved published fuelling protocol developed by a recognized standards development
organization (SDO), such as SAE J2601 or
— use protocols that have been approved by the manufacturers of each vehicle to fuel at that refuelling
point using that protocol and by regulatory authorities when appropriate. The fuelling station
operator shall take measures to prevent the refuelling of vehicles at a refuelling point where
protocols are not approved by the manufacturer(s) of the vehicles using that refuelling point.
NOTE Examples of countermeasures that can be employed to prevent vehicles fuelling at refuelling points
where the fuelling protocol has not been approved are provided in Annex B.
The fuelling protocol shall ensure, directly or indirectly, that the maximum CHSS material temperature
does not exceed 85 °C throughout the refuelling.
The fuelling protocol shall consider the possible range of temperatures of the CHSS of the vehicle prior to
refuelling as well as the full range of ambient temperatures when establishing the refuelling rates, to
ensure that the storage system on the vehicle does not inadvertently experience an over-fill or over-
temperature condition.
If necessary, the fuelling protocol shall adjust the refuelling rate and target pressure based on measured
ambient and process conditions, such as dispensed hydrogen gas temperature and pressure, to ensure
that the process limits listed in 5.3.2 and 5.3.3 below are maintained for the vehicle. If these conditions
cannot be maintained within the limits, the refuelling shall cease.
The fuelling protocol should be appropriate for the range of vehicle tank capacities that are intended to
be refuelled.
Measures should be taken to ensure that sequential refuelling of the same vehicle does not lead to an
unsafe situation, for example using different fuelling protocols, at different fuel temperatures.
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The dispensing system may either conduct the refuelling using communication with the vehicle as part
of the refuelling process (see 5.3.4) or conduct the fuelling protocol without communications with the
vehicle. The fuelling protocol may have provisions for both communication and non-communications
fuellings.
The fuelling protocol shall include a leak check of the fuel hose, hose breakaway device, nozzle and
connection to the vehicle before refuelling. The leak check shall be carried out while the vehicle is
connected. The refuelling shall be stopped in the event of leak detection above the acceptable limit.
5.3.2 Fuelling protocol process limits for light duty vehicle dispensing systems
Hydrogen refuelling points shall be designed to fuel vehicles compliant with UNECE R134 or
Regulation (EC) No 79/2009 (see Annex A for relevant limits based on assumptions made about the
vehicle being refuelled) by fulfilling the requirements of this subclause. Refuelling points using fuelling
protocols that could potentially be unsafe for such vehicles shall incorporate appropriate
countermeasures.
NOTE 1 Examples of countermeasures that can be employed to prevent vehicles refuelling at refuelling points
where the fuelling protocol could be unsafe for UNECE R134 or Regulation (EC) No 79/2009 vehicles are provided
in Annex B.
The refuelling of vehicles not compliant with the UNECE R134 or Regulation (EC) No 79/2009 should be
addressed by risk assessment and, if necessary, the fuelling protocol process limits defined in this chapter
should be revised accordingly.
The fuelling protocol shall ensure the following:
During the refuelling process, the refuelling point dispensing system shall meet the following fuelling
protocol limits, or terminate the refuelling within 5 s:
— ambient temperature no less than −40 °C and no greater than+50 °C;
— dispenser fuel pressure less than the maximum operating pressure (MOP), see 5.3.5;
NOTE 2 See 5.3.5 for over-pressure protection measures if a fault occurs.
— dispenser fuel temperature greater than −40 °C;
— fuel flow rate less than 60 g/s (excluding momentary excursions during the initial connection
sequence - i.e. connecting the nozzle to the receptacle prior to the start of refuelling);
— where communications are used, a communicated CHSS temperature less than 85 °C;
— a maximum of 10 pauses during refuelling where the fuel flow rate drops below 0,6 g/s.
Additionally, the dispensing system shall also terminate the refuelling within 5 s if any of the following
events occur:
— where communications are used, an abort or halt signal is received from the vehicle being refuelled;
— any deviations from the fuelling protocol (see 5.3.1) arise.
As part of the fuelling protocol, a quantity of hydrogen may be transferred to the vehicle to determine the
start pressure prior to the start of refuelling:
— the maximum hydrogen mass allowed to be transferred to the vehicle during this process should be
200 g;
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— dispensing systems shall not fuel a vehicle which has a pressure lower than 0,5 MPa or a pressure
greater than the appropriate vehicle NWP (i.e. 35 MPa or 70 MPa) after this process.
Following refuelling, the vehicle state of charge should not exceed 100 %.
The above limits shall also be considered as part of the dispenser risk assessment, see 6.1, with the
possibility that additional countermeasures (beyond normal termination of the refuelling) may be
required to prevent these limits from being exceeded.
5.3.3 Fuelling protocol process limits for medium and heavy duty vehicle dispensing systems
Where hydrogen refuelling points are designed to fuel medium or heavy duty vehicles, the requirements
for 5.3.2 shall be met, with the following exception:
— when the dispenser has a high flow nozzle, see ISO 17268, which prevents connection to a standard
vehicle receptacle (i.e. non high flow receptacle), the maximum fuel flow rate (excluding momentary
excursions during the initial connection sequence - i.e. connecting the nozzle to the receptacle prior
to the start of refuelling) may exceed 60 g/s where both the refuelling point and the vehicle are
designed for the higher flow rate.
Countermeasures shall be included to prevent vehicles that are not suitable for the fuelling protocol from
being refuelled.
NOTE Examples of countermeasures that can be employed to prevent vehicles refuelling at dispensers where
the fuelling protocol is not suitable are provided in Annex B.
5.3.4 Vehicle to station communications
For light duty vehicle H70 refuelling, hydrogen dispensing systems shall have the communications
hardware and software to ensure that the refuelling is conducted within the fuelling protocol process
limits for vehicles compressed hydrogen storage systems as defined in 5.3.2 and 5.3.3.
NOTE 1 This is recommended for H35 dispensers as well, as there are some applications which use
communications.
NOTE 2 H70 non-communications refuelling may still be used as required, for example, in the ca
...

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