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ISO 19880-1:2020 (E)
ISO - Cover page
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms
5 Risk management
 5.1 Hydrogen fuelling station safety recommendations
 5.2 Risk assessment
 5.3 Mitigation measures to improve system safety
  5.3.1 General
  5.3.2 Mitigations which reduce the potential for the formation of a flammable mixture
  5.3.3 Mitigation for the formation of a flammable mixture in enclosures
  5.3.4 Mitigation for the formation of a flammable mixture under a canopy
  5.3.5 Mitigations which reduce the potential for ignition
  5.3.6 Mitigation of the escalation and/or impact of a fire or explosion originating from the fuelling installation
  5.3.7 Mitigation of the effect of an external fire/events on the fuelling station installation
  5.3.8 Mitigation of risk to the high pressure hydrogen storage system of the vehicle being fuelled
 5.4 Safety distances
  5.4.1 General
  5.4.2 Safety distances relating to hydrogen vent stack outlets
 5.5 Protection measures for non-hydrogen hazards
  5.5.1 General
  5.5.2 Protection measures for asphyxiation hazard in an enclosure (confined space)
  5.5.3 Protection measures for emergency egress from enclosed spaces
  5.5.4 Ingress protection measures
  5.5.5 Protection measures for hose whip
  5.5.6 Protection measures for noise
  5.5.7 Protection against exposure to extremely cold or hot temperatures
6 Hydrogen supply safety and operation
 6.1 On site generation
  6.1.1 Hydrogen generators using water electrolysis
  6.1.2 Hydrogen generators using fuel processing technologies
 6.2 Hydrogen delivery
  6.2.1 Gaseous hydrogen supply by tube trailers and multiple element gas containers (MEGC)
  6.2.2 Liquid hydrogen supply by tanker
 6.3 Pipeline
7 Equipment and Components
 7.1 General recommendations
  7.1.1 Hydrogen materials
  7.1.2 Material hydrogen compatibility
  7.1.3 Other material recommendations
 7.2 Piping carrying hydrogen
  7.2.1 General
  7.2.2 Pipe fittings, valves, hoses, for gaseous hydrogen
 7.3 Hydrogen storage recommendations
  7.3.1 General
  7.3.2 Gaseous hydrogen storage vessels
  7.3.3 Gaseous hydrogen storage siting recommendations
 7.4 Hazardous areas (with potentially flammable mixtures)
  7.4.1 General
  7.4.2 Equipment in hazardous areas
 7.5 Hydrogen compressors
  7.5.1 General
  7.5.2 Vibration and movement
  7.5.3 Control and monitoring
 7.6 Instruments for gaseous hydrogen systems
 7.7 Filters for gaseous hydrogen
 7.8 Gaseous hydrogen vent systems
  7.8.1 General
  7.8.2 Vent outlet
  7.8.3 Vent sizing
  7.8.4 Multiple relief devices
 7.9 Pneumatics and hydraulics
 7.10 Hydrogen purifier
 7.11 Enclosures and buildings containing hydrogen equipment
  7.11.1 General design
  7.11.2 Maintenance access and possible occupancy
  7.11.3 Ventilation of enclosures and buildings containing hydrogen equipment
  7.11.4 Use of enclosures or compartments within enclosures to control hazards areas
  7.11.5 Electrical and mechanical equipment within enclosures and buildings containing hydrogen equipment
  7.11.6 Over-pressure protection of enclosures and buildings containing hydrogen equipment
8 Dispensing systems
 8.1 General requirements
 8.2 Hydrogen vehicle fuelling
  8.2.1 Dispensing system process control
  8.2.2 Dispensing system safety devices
 8.3 Dispensing systems
  8.3.1 General design and assembly
  8.3.2 Dispensing system hydrogen components
  8.3.3 Dispenser housings and cabinets
  8.3.4 Dispenser fuelling assembly
 8.4 Dispenser installation
  8.4.1 General
  8.4.2 Location and protection of dispensers
  8.4.3 Fuelling pad
  8.4.4 Hazardous area around the dispenser
  8.4.5 Installation of the fuelling assembly to prevent damage in service
  8.4.6 Electrical continuity for bonding and grounding
 8.5 Operating considerations
 8.6 Maintenance and inspection
9 Hydrogen quality
 9.1 General
 9.2 Dispensing system fuel filters
10 Electrical
 10.1 General electrical
  10.1.1 Components
  10.1.2 Site (interconnections to and/or between equipment assemblies)
  10.1.3 Electrical bonding and grounding
  10.1.4 Lightning protection
 10.2 Hazardous areas (potentially flammable mixtures)
  10.2.1 General
  10.2.2 Protection requirements for electrical equipment within hazardous areas
  10.2.3 Protection from ignition due to accumulation of static charge
 10.3 Electromagnetic compatibility and interference (EMC)
  10.3.1 General
  10.3.2 Industrial (EMC) Environments
  10.3.3 Residential, Commercial, and Light-Industrial (EMC) Environments
11 Instrumentation and control system
 11.1 General
 11.2 Emergency shutdown functionality
  11.2.1 General
  11.2.2 Manually actuated emergency stop devices
  11.2.3 Hydrogen detection systems
 11.3 Remote system control
 11.4 Modifications to control system
12 Station inspection and tests
 12.1 General
 12.2 Pressure test
 12.3 Leak test
 12.4 Electrical testing
 12.5 Fuelling safety and performance functional testing
  12.5.1 General
  12.5.2 Fuelling protocol test
  12.5.3 Test procedure
  12.5.4 Site acceptance testing options
  12.5.5 Additional performance considerations for fuelling
 12.6 Hydrogen quality testing
 12.7 Station inspection and tests following modifications
13 Operation
 13.1 General
 13.2 Warning signs
 13.3 Dispenser operational instructions
 13.4 Functional identification
 13.5 Marking of equipment (data plate)
 13.6 Reference designations
 13.7 Training
 13.8 Emergency response plan
 13.9 Emergency contact information
14 Technical documentation
 14.1 General
 14.2 Information to be provided
 14.3 Recommendations applicable to all documentation
 14.4 Installation documents
  14.4.1 General
  14.4.2 Installation documentation for hazardous areas
  14.4.3 Venting documentation
  14.4.4 Seismic documentation
  14.4.5 Handling and lifting documentation
 14.5 Overview diagrams and function diagrams
 14.6 Circuit diagrams
 14.7 Flow (P&ID) diagrams
 14.8 Fuelling station operating manual
 14.9 Maintenance and service manuals
 14.10 Parts list
15 Inspection and maintenance
 15.1 Inspection and maintenance program
 15.2 Maintenance and testing frequency of gas detection
 15.3 Maintenance and inspection frequency of filters
 15.4 Maintenance of pressure relief devices
 15.5 Hot work
 15.6 Modifications to the hydrogen fuelling station and associated equipment
Annex A (informative) Safety methodologies and risk assessment
Annex B (informative) Further guidance on risk management
Annex C (informative) Hydrogen dispensing and examples of fuelling and communications protocols, and corresponding verification testing
Annex D (informative) Reference fuelling limits of hydrogen and fuel cell vehicles
Annex E (informative) Pressure level application to design verification requirements for hydrogen dispensing systems and compressed hydrogen storage systems
Annex F (informative) Countermeasures for unsuitable hydrogen fuelling protocols
Annex G (informative) Recommendations for, and example of, vehicular impact protection measures
Annex H (informative) Example for leakage testing of hydrogen fuelling system
Annex I (informative) Minimum fuelling station acceptance inspection, testing and validation checklist
Annex J (informative) Hydrogen station testing apparatus (HSTA)
Annex K (informative) Sampling procedures and hardware for hydrogen fuel quality analysis
Bibliography

INTERNATIONAL

STANDARD

ISO
19880-1
First edition
2020-03



Gaseous hydrogen — Fuelling stations —
Part 1:
General requirements
Carburant d'hydrogène gazeux — Stations-service —
Partie 1: Exigences générales




Contents Page

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 197, Hydrogen technologies.
This first edition cancels and replaces ISO/TS 19880-1:2016, which has been technically revised.
The main changes compared to the ISO/TS 19880-1:2016 are as follows:
where appropriate, guidance information from the TS was converted to requirements;
the difference between the risk assessment and the design requirement clauses were clarified and references were added to ensure that the appropriate clauses were linked;
Annex A from the TS on safety distances was removed;
Annex C from the TS on hydrogen quality control was removed to ISO 19880-8;
the presentation of the information was improved and much of the guidance information was moved to informative annexes.
A list of all parts in the ISO 19880 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

INTERNATIONAL STANDARD ISO 19880-1:2020 (E)
Gaseous hydrogen — Fuelling stations —
Part 1:
General requirements

1 Scope

This document defines the minimum design, installation, commissioning, operation, inspection and maintenance requirements, for the safety, and, where appropriate, for the performance of public and non-public fuelling stations that dispense gaseous hydrogen to light duty road vehicles (e.g. fuel cell electric vehicles).
This document is not applicable to the dispensing of cryogenic hydrogen, or hydrogen to metal hydride applications.
Since this document is intended to provide minimum requirements for fuelling stations, manufacturers can take additional safety precautions as determined by a risk management methodology to address potential safety risks of specific designs and applications.
While this document is targeted for the fuelling of light duty hydrogen road vehicles, requirements and guidance for fuelling medium and heavy duty road vehicles (e.g. buses, trucks) are also covered.
Many of the generic requirements within this document are applicable to fuelling stations for other hydrogen applications, including but not limited to the following:
fuelling stations for motorcycles, fork-lift trucks, trams, trains, fluvial and marine applications;
fuelling stations with indoor dispensing;
residential applications to fuel land vehicles;
mobile fuelling stations; and
non-public demonstration fuelling stations.
However, further specific requirements that can be necessary for the safe operation of such fuelling stations are not addressed in this document.
This document provides requirements for and guidance on the following elements of a fuelling station (see Figure 1 and Figure 2):
hydrogen production/delivery system:
delivery of hydrogen by pipeline, trucked in gaseous and/or liquid hydrogen, or metal hydride storage trailers;
on-site hydrogen generators using water electrolysis process or hydrogen generators using fuel processing technologies;
liquid hydrogen storage;
hydrogen purification systems, as applicable;
compression:
gaseous hydrogen compression;
pumps and vaporizers;
gaseous hydrogen buffer storage;
pre-cooling device;
gaseous hydrogen dispensing systems.
Figure 1 — Example of typical elements that a fuelling station consists of, including hydrogen supply
graphic
a May include a buffer vessel (or accumulator) for dampening or adjusting flow of compressor suction inlet.
Figure 2 — Image of an example hydrogen fuelling station
graphic

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
ISO 13850, Safety of machinery — Emergency stop function — Principles for design
ISO 14687, Hydrogen fuel — Product specification
ISO 15649, Petroleum and natural gas industries — Piping
ISO 17268, Gaseous hydrogen land vehicle refuelling connection devices
ISO 19880-8, Gaseous hydrogen — Fuelling stations — Part 8: Hydrogen quality control
ISO 21013-1, Cryogenic vessels — Pressure-relief accessories for cryogenic service — Part 1: Reclosable pressure-relief valves
ISO 21013-2, Cryogenic vessels — Pressure-relief accessories for cryogenic service — Part 2: Non-reclosable pressure-relief devices
ISO 21013-3, Cryogenic vessels — Pressure-relief accessories for cryogenic service — Part 3: Sizing and capacity determination
ISO 22734, Hydrogen generators using water electrolysis
ISO/IEC 80079 (all parts), Explosive atmospheres
IEC 60079 (all parts), Explosive atmospheres
IEC 60204-1:2005, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 62282-3-100, Fuel cell technologies. Stationary fuel cell power systems. Safety
EN 13445-5, Unfired pressure vessels. Inspection and testing
SAE J2600: 2015-08, Compressed Hydrogen Surface Vehicle Fuelling Connection Devices

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:
ISO Online browsing platform: available at https://www.iso.org/obp
IEC Electropedia: available at http://www.electropedia.org/
3.1
acceptance criteria
<risk or harm > acceptable level of risk or harm (3.34), locally defined as:
a tolerable risk value; or
a specified harm level; or
requirements in a prescriptive document
3.2
accessory
device with an operational function
3.3
bleed
<venting> intentional expiration of a fluid from a fluid system
3.4
basic process control system
BPCS
system which responds to input signals from the process, its associated equipment, other programmable systems and/or an operator and generates output signals causing the process and its associated equipment to operate in the desired manner but which does not perform any safety-instrumented functions with a claimed SIL (3.73) ≥ 1
[SOURCE: IEC 61511-1:2004, 3.2.3]
3.5
breakaway device
device on the fuelling hose (3.27) that disconnects the hose from the dispenser (3.13) when a tension limit is exceeded and blocks the flow of hydrogen from the dispenser, e.g. if the vehicle moves away with the fuelling hose connected to the vehicle
3.6
buffer storage vessels
pressure vessels designed for the purpose of storing compressed hydrogen, which can be located between a hydrogen generator and a compressor for an even flow of gas to the compressor or between the compressor and dispensing system (3.17) for accumulation of pressurized gas supply for vehicle fuelling
3.7
building
structure, usually enclosed by walls and a roof, constructed to provide support or shelter for intended occupancy
3.8
canopy
roof, overhead shelter, or hood which affords a degree of weather protection
3.9
compressed hydrogen storage system
CHSS
hydrogen storage on-board vehicle, as defined in the GTR#13
3.10
component pressure rating
maximum pressure at which it is permissible to operate a component as specified by the manufacturer at a specified temperature
Note 1 to entry: Components designed with a maximum allowable pressure per the European PED represent the component pressure rating by the manufacturer that as indicated by the value of “PS”.
Note 2 to entry: This is sometimes referred to as the maximum allowable working pressure (3.45) for the component, for example for vessels.
Note 3 to entry: In addition to the specification of the maximum temperature, the manufacturer can define an allowable minimum temperature or temperature range expected for service. For additional thermal conditions and risks potentially experiences during fires (3.23), see 5.3.6.4.
Note 4 to entry: Pressures up to 10 % above the rating can occur during fault management by PSV. See E.3 regarding limited cycle testing to 110 % of the rating as part of verification testing to demonstrate capability of the component.
Note 5 to entry: See Annex E for discussion of pressure terminology and its application to dispensing systems (3.17) and fuelling stations (3.29) in general.
3.11
control system
system which responds to input signals from the process and/or from an operator and generates output signals causing the process to operate in the desired manner
Note 1 to entry: Also see safety-instrumented system (SIS) (3.72) and basic process control system (BPCS) (3.4).
3.12
connector
matching parts (such as male and female parts) that can be put together to form a "connection" which permits the transfer of fluids, electric power, or control signals
Note 1 to entry: Fittings (3.24) are a type of connector used in piping systems.
Note 2 to entry: Examples of connectors commonly used in hydrogen systems are as follows:
a)
The fuelling nozzle (3.53) “connector” mates with the receptacle (3.64) “connector” on the vehicle to form the connection for transfer of compressed hydrogen between the dispenser (3.13) and the vehicle, as defined in ISO 17268 for this specific application;
b)
The hose assemblies have connectors on each end that allow coupling to the hoses and connection to the piping system, e.g. hose breakaway device (3.5) or fuelling nozzle;
c)
Control systems (3.11) often use electrical connectors to allow rapid and secure assembly or replacement.
3.13
dispenser
equipment in the dispensing system (3.17), including the dispenser cabinet(s) (3.14) 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 (3.26), 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.
3.14
dispenser cabinet
protective housing (3.40) that encloses process piping and can also enclose measurement, control and ancillary dispenser (3.13) equipment
3.15
dispenser fuel pressure
pressure of the hydrogen gas supplied to the vehicle by the station
Note 1 to entry: See Annex E for discussion of pressure terminology and its application to dispensing systems (3.17).
3.16
dispenser fuel temperature
temperature of the hydrogen gas supplied to the vehicle by the station
3.17
dispensing system
system downstream of the hydrogen supply system comprising all equipment necessary to carry out the vehicle fuelling operation, through which the compressed hydrogen is supplied to the vehicle
3.18
enclosure
structure, protective housing (3.40), container, machine cabinet, etc. which encloses or partially encloses equipment of a station that may have access for maintenance but is not intended to be occupied
Note 1 to entry: The use of an enclosure could be to protect equipment from the environment, provide noise attenuation, or provide safety (3.69) to the areas surrounding the equipment.
Note 2 to entry: A canopy (3.8) without walls is not regarded as an enclosure in this context.
3.19
explosion
ignition and rapid combustion that causes an over-pressure
Note 1 to entry: A rapid deflagration and/or a detonation are explosions.
Note 2 to entry: Slow deflagrations or jet flames do not create an over-pressure and are therefore not considered to be explosions.
3.20
explosive gas atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of gas or vapour, which, after ignition, permits self-sustaining flame propagation
Note 1 to entry: Although a mixture which has a concentration above the upper flammable limit (UFL) is not an explosive gas atmosphere, it can readily become so and, generally for area classification purposes, it is advisable to consider it as an explosive gas atmosphere.
[SOURCE: IEC 60079-10-1:2015, 3.2]
3.21
factory acceptance testing
FAT
tests performed in the factory on fuelling station (3.29) equipment or systems to verify functionality and/or integrity prior to shipment to the site, (or an appropriate alternative type acceptance methodology)
3.22
fallback
back-up control strategy, for example in the fuelling protocol when the anticipated precooling of hydrogen to within a specified range of temperatures is not achieved, however fuelling is able to continue, typically at a different fuelling rate
3.23
fire
non-premixed combustion process of a solid, liquid pool, or a jet plume of flammable substance
Note 1 to entry: A fire is the combustion of a solid or liquid of a process first of pyrolysis or evaporation to a combustible gas where a non-premixed combustion process ensues. Also, a non-premixed combustion of a flammable plume (jet fire) is also covered by this definition as is combustion of metals and of hydrogen released by a metal hydride. A fire as defined here does not create an over-pressure therefore is not an explosion (3.19), nor is it a deflagration or a detonation which are premixed combustion phenomena.
3.24
fitting
part or design feature on a component used to join (i.e. connect) any pressure retaining components in the system
3.25
forecourt
surfaced area where vehicle dispensing operations are conducted including the fuelling pad (3.28) and any area underneath a canopy (3.8)
3.26
fuelling assembly
part of the dispenser (3.13) providing the interface between the hydrogen fuelling station (3.29) and the vehicle - an assembly consisting of a hose breakaway device (3.5), a hose(s), a nozzle (3.53) and connections between these components
Note 1 to entry: The fuelling assembly can include, or not, a nozzle vent line (with hose breakaway device and hose) depending on the type of nozzle, and communications, if used.
3.27
fuelling hose
flexible conduit used for dispensing gaseous hydrogen to vehicles through a fuelling nozzle (3.53)
3.28
fuelling pad
area with special construction requirements adjacent to the hydrogen dispensers (3.13), where customers park their vehicles during fuelling
3.29
hydrogen fuelling station
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, and hydrogen compression, storage, and dispensing systems (3.17)
3.30
stand-alone
<hydrogen fuelling station or dispenser> independent for the dispensing of compressed hydrogen only
3.31
integrated
<hydrogen fuelling station or dispenser> being part of an existing, or new build, conventional fuelling station (3.29) for the dispensing of compressed hydrogen
3.32
fuelling station operator
person or organization responsible for the safe operation, maintenance and housekeeping of the fuelling station (3.29)
3.33
guard
part of a machine specially used to provide protection by means of a physical barrier
Note 1 to entry: Depending on its construction, a guard can be called casing, cover, screen, door, enclosed guard, etc.
3.34
harm
physical injury or damage to the health of people, or damage to property or the environment
[SOURCE: ISO/IEC Guide 51:2014, 3.1, modified — The word "physical" has been added.]
3.35
harmonised standard
European standard developed by a recognised European Standards Organization (CEN, CENELEC, or ETSI), in line with a European Directive
3.36
hazard
potential source of harm (3.34)
[SOURCE: ISO/IEC Guide 51: 2014, 3.2]
3.37
hazard distance
distance from the hazard (3.36) to a determined physical effect value that can lead to a range of harm (3.34) to people, equipment or environment
Note 1 to entry: It can be used as an input to quantitative risk assessment (3.66) to, for example, estimate the risk of injury or fatality to people (e.g. via probit functions).
Note 2 to entry: Hazards include, for example, physical, thermal, or pressure effects that can cause harm and can be determined by physical or numerical modelling, experience, or by a regulation.
3.38
hazardous area
classified area
<explosive gas atmospheres> area in which an explosive gas atmosphere (3.20) is or may be expected to be present, in quantities such as to require special precautions for the construction, installation and use of equipment
Note 1 to entry: The interior of many items of process equipment are commonly considered as a hazardous area even though a flammable atmosphere may not normally be present to account for the possibility of air entering the equipment. Where specific controls such as inerting are used the interior of process equipment may not need to be classified as a hazardous area.
[SOURCE: IEC 60079-10-1:2015, 3.3.1, modified — The alternative preferred term "classified area" has been added.]
3.39
hose assembly
assembly which includes the hose and end connections, including any necessary fittings (3.24), bend restrictors, and appropriate markings.
3.40
housing
guard (3.33) or enclosure (3.18) for operating parts, control mechanisms, or other components, that need not be accessible during normal operation
3.41
hydrogen purifier
equipment to remove undesired constituents from the hydrogen
Note 1 to entry: Hydrogen purifiers can comprise purification vessels, dryers, filters and separators.
3.42
hydrogen service level
HSL
pressure level in MPa used to characterize the hydrogen service of the dispensing system (3.17) based on the NWP (3.51) of the vehicle.
Note 1 to entry: The numerical value of HSL also matches the number after the “H” in the pressure class (3.58) (see Table 1).
Note 2 to entry: See Annex E for application of pressure terminology to hydrogen dispensing systems and vehicles.
3.43
incident
any unplanned event that resulted in injury or ill health of people, or damage or loss to property, plant, materials or the environment or a loss of business opportunity
Note 1 to entry: The use of the term incident is intended to include the term accident.
3.44
lower flammable limit
LFL
concentration of flammable gas, vapour or mist in air below which an explosive gas atmosphere (3.20) will not be formed
[SOURCE: IEC 60079-10-1:2015, 3.6.12]
3.45
maximum allowable working pressure
MAWP
maximum pressure permissible in a system at the temperature specified for the pressure
Note 1 to entry: The maximum allowable working pressure can 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 E for discussion of pressure terminology and its application to dispensing systems (3.17) and fuelling stations (3.29) in general.
3.46
maximum fuelling pressure
MFP
maximum pressure expected during a normal (fault-free) vehicle fuelling
Note 1 to entry: Per the GTR#13, the maximum fuelling pressure is 125 % NWP (3.51) (see Annex D).
Note 2 to entry: Also referred to as Maximum Fill Pressure.
Note 3 to entry: See Annex E for discussion of pressure terminology and its application to dispensing systems (3.17) and fuelling stations (3.29) in general.
3.47
maximum operating pressure
MOP
highest pressure that is expected for a component or system during normal operation including anticipated transients
Note 1 to entry: In the case of the dispensing system (3.17), the MOP is equivalent to the maximum fuelling pressure (3.46) of the vehicle.
Note 2 to entry: See Annex E for discussion of pressure terminology and its application to dispensing systems and fuelling stations (3.29) in general.
3.48
mitigation
combination of the measures incorporated at the design stage and the measures required to be implemented by the station operator, dispenser (3.13) operator, or others involved with the operation and maintenance of the fuelling station (3.29) to reduce the probability (3.60) or severity of an incident (3.43)
3.49
mobile storage
multiple-element gas container (3.50) or liquid hydrogen tank fixture mounted on a vehicle or trailer and used for the transportation of hydrogen to hydrogen fuelling stations (3.29)
3.50
multiple-element gas container
MEGC
multimodal assembly of cylinders, tubes or bundles of cylinders which are interconnected by a manifold and assembled within a framework, including service equipment and structural equipment necessary for the transport of gases
Note 1 to entry: This definition is taken from the UN Model Regulations. ADR[79] uses a different definition.
[SOURCE: ISO 10286:2015, 2.2.1, 210]
3.51
nominal working pressure
NWP
pressure of a vehicle CHSS (3.9) at 100 % SOC (3.78) at a gas temperature of 15 ºC
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 E for discussion of pressure terminology and the correspondence between vehicle terminology and dispensing systems (3.17).
Note 4 to entry: Also known as “settled pressure” in ISO 10286.
3.52
non-public fuelling station
fuelling station (3.29) that does not sell or dispense gaseous hydrogen to the general public
EXAMPLE
Private or municipal vehicle fleet operation.
3.53
nozzle
device connected to a fuel dispensing system (3.17), which permits the quick connect and disconnect of fuel supply to the vehicle storage system
[SOURCE: ISO 17268:2012, 3.8]
3.54
outdoors
location outside of any building (3.7) or structure, or location under a roof, weather shelter, or canopy (3.8) provided this area is not enclosed on more than two sides
3.55
plinth
raised area on the forecourt (3.25), supporting and protecting the dispensers (3.13) and associated equipment
3.56
positive isolation
complete separation of one part of the plant or equipment from other parts of the system
Note 1 to entry: Positive isolation can be provided to equipment or piping items for maintenance purposes using various arrangements depending on following factors, as piping rating, equipment in shutdown or equipment under service.
Note 2 to entry: Physical disconnection, for example, spool removal, or use of a blind or a spade are typical ways to provide positive isolation.
Note 3 to entry: Alternatively, proved isolation (3.61) can be deemed acceptable based on risk assessment (3.66).
Note 4 to entry: Further information can be found in HSG253.
3.57
pre-cooling
process of cooling hydrogen fuel temperature prior to dispensing
3.58
pressure class
non-dimensional rating of components 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 (3.42), 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 E for discussion of pressure terminology and its application to dispensing systems (3.17) and fuelling stations (3.29) in general.
Note 3 to entry: Additional examples of pressure class come from ISO 15649; e.g. "600", "3000" or "6000".
3.59
pressure relief device
PRD
safety (3.69) device that releases gases or liquids above a specified pressure value in cases of emergency or abnormal conditions
Note 1 to entry: PRDs can be activated by pressure or another parameter, such as temperature, and can be either re-closing devices (such as valves) or non-re-closing devices (such as rupture disks and fusible plugs). Common designations for these specific types of PRDs are as follows:
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. Requirements for PRVs used in dispensing systems (3.17) can be found in 8.2.2.3. PSVs protecting the dispensing system can reclose above the MOP (3.47).
Thermally-activated pressure relief device (TPRD) — a PRD that opens at a specified temperature to protect a system from rupture and remains open.
Note 2 to entry: See Annex E for discussion of pressure terminology and its application to pressure protection of the dispensing system and fuelling stations (3.29) in general.
3.60
probability
expression of the chance (likelihood) that a considered event will take place to property, system, business or to the environment
3.61
proved isolation
valved isolation where the effectiveness of valves closure can be confirmed via vent or bleed (3.3) points
Note 1 to entry: Proved isolation can often be used instead of positive isolation (3.56), where this is deemed acceptable based on risk assessment (3.66).
Note 2 to entry: An assembly commonly referred to as Double Block and Bleed is often used. For such systems, two block valves are required for additional isolation between the operational process side and the device requiring maintenance. A bleed valve is used to drain or vent the fluids trapped between the two block valves.
Note 3 to entry: Further information can be found in HSG253.
3.62
public fuelling station
fuelling station (3.29) that sells gaseous hydrogen to the general public
3.63
qualified personnel
personnel with knowledge or abilities, gained through training and/or experience as measured against established requirements, standards or tests, that enable the individual to perform a required function
[SOURCE: ISO 10417:2004, 3.13, modified — The word "characteristics" has been replaced with "knowledge".]
3.64
receptacle
device connected to a vehicle storage system which receives the nozzle (3.53)
Note 1 to entry: This can also be referred to as a fuelling inlet or gas filling port in other documents.
[SOURCE: ISO 17268:2012, 3.11]
3.65
risk
combination of the probability (3.60) of occurrence of harm (3.34) and the severity of that harm; encompassing both the uncertainty about and severity of the harm
[SOURCE: ISO/IEC Guide 51:2014, 3.9, modified — The part “encompassing both the uncertainty about and severity of the harm” has been added; Note 1 to entry has been removed.]
3.66
risk assessment
determination of quantitative or qualitative value of risk related to a specific situation and a recognised threat (also called hazard (3.36))
Note 1 to entry: Based on national requirements, a review of a risk analysis or a safety (3.69) concept by third party is sometimes required.
3.67
risk level
assessed magnitude of the risk
3.68
safeguarding
instruments or final elements related to safety-instrumented system, SIS (3.72), or pressure relief device, PRD (3.59)
Note 1 to entry: Safeguarding can be instrumental safeguarding or mechanical safeguarding.
3.69
safety
freedom from unacceptable risk
[SOURCE: ISO/IEC Guide 51:2014, 3.14]
3.70
safety distance
separation distance
safe distance
setback distance
distance to acceptable risk level (3.67) or minimum risk-informed distance between a hazard (3.36) source and a target (human, equipment or environment), which will mitigate the effect of a likely foreseeable incident (3.43) and prevent a minor incident escalating into a larger incident
Note 1 to entry: Safety distances could be split into Restriction distances, Clearance distances, Installation layout distances, Protection distances and External risk zone. See A.5.2 for further details.
3.71
safety function
function to be implemented by a safety-instrumented system (3.72), which is intended to achieve or maintain a safe state for the process, with respect to a specific hazardous situation
Note 1 to entry: Other technologies or risk reduction measures have a safety function not achieved through a safety-instrumented system, however validation of these measures is equally important.
3.72
safety-instrumented system
SIS
instrumented system used to implement one or more safety-instrumented functions
Note 1 to entry: A safety-instrumented system is composed of any combination of sensors, logic solvers, and final elements.
Note 2 to entry: A separate safety-instrumented system (SIS), typically with a greater reliability than the more basic process control system (BPCS) (3.4), can be required, according to the manufacturer’s risk assessment (3.66), to respond solely to safety critical alarms. Further information is provided by IEC 61508 and IEC 61511.
3.73
safety integrity level
SIL
discrete level (one out of a possible four), corresponding to a range of safety integrity values, where safety integrity level 4 has the highest level of safety integrity and safety integrity level 1 has the lowest
Note 1 to entry: The target failure measures (see IEC 61508-4) for the four safety integrity levels are specified in IEC 61508-1:2010, Tables 2 and 3.
Note 2 to entry: Safety integrity levels are used for specifying the safety integrity requirements of the safety functions (3.71) to be allocated to the E/E/PE safety-related systems (3.74).
Note 3 to entry: A safety integrity level (SIL) is not a property of a system, subsystem, element or component. The correct interpretation of the phrase “SIL n safety-related system” (where n is 1, 2, 3 or 4) is that the system is potentially capable of supporting safety functions with a safety integrity level up to n.
Note 4 to entry: See 8.2.
[SOURCE: IEC 61508-4:2010, 3.5.8, modified — Note 4 to entry has been added.]
3.74
safety-related system
designated system that both implements the required safety functions (3.71) necessary to achieve or maintain a safe state for the EUC and is intended to achieve, on its own or with other E/E/PE safety-related systems, other technology safety-related systems or external risk reduction facilities, the necessary safety integrity for the required safety functions
Note 1 to entry: The term refers to those systems, designated as safety-related systems, that are intended to achieve, together with the external risk reduction facilities (IEC 61508-5:2010, 3.4.3), the necessary risk reduction in order to meet the required tolerable risk (IEC 61508-5:2010, 3.1.6 and Annex A).
Note 2 to entry: The safety-related systems are designed to prevent the EUC from going into a dangerous state by taking appropriate action on receipt of commands. The failure of a safety-related system would be included in the events leading to the determined hazard (3.36) or hazards. Although there can be other systems having safety functions, it is the safety-related systems that have been designated to achieve, in their own right, the required tolerable risk. Safety-related systems can broadly be divided into safety-related control systems (3.11) and safety-related protection systems, and have two modes of operation (IEC 61508-5:2010, 3.5.12).
Note 3 to entry: Safety-related systems are potentially an integral part of the EUC control system or interface with the EUC by sensors and/or actuators. That is, the required safety integrity level (3.73) is achieved by implementing the safety functions in the EUC control system (and possibly by additional separate and independent systems as well) or the safety functions can be implemented by separate and independent systems dedicated to safety.
Note 4 to entry: A safety-related system is designed:
a)
to prevent a hazardous event (i.e. if the safety-related systems perform their safety functions then no hazardous event arises);
b)
to mitigate the effects of the hazardous event, thereby reducing the risk by reducing the consequences;
c)
to achieve a combination of a) and b).
3.75
site acceptance testing
SAT
tests performed after installation of the fuelling station (3.29) at the site to verify functionality and/or integrity
3.76
skid
process system contained within a frame that allows the process system to be easily transported and installed for operation
3.77
standards development organization
SDO
industry- or sector-based standards organizations that develop and publish industry specific standards
Note 1 to entry: In some cases, international industry-based SDOs may have direct liaisons with international standards organizations. SDOs are differentiated from standards setting organizations (SSOs) in that SDOs may be accredited to develop standards using open and transparent processes.
Note 2 to entry: In the European Union, only standards created by CEN, CENELEC, and ETSI are recognized as European standards, and member states are required to notify the European Commission and each other about all the draft technical regulations. These rules were laid down in Directive 2015/1535/EU with the goal of providing transparency and control with regard to technical regulations.
3.78
state of charge
SOC
density (or mass) ratio of hydrogen in the compressed hydrogen storage system (CHSS) (3.9) between the actual CHSS condition and the capacity at NWP (3.51) 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.
Note 3 to entry: (%) can be calculated as follows: graphic ρ 1 ρ 2 ×100 where
  ρ1 is the density of hydrogen under the specific gas conditions;
  ρ2 is the density of hydrogen at the nominal working pressure at a gas temperature of 15 °C.
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 H2 at 70 MPa and 15 °C = 40,2 g/l
Note 4 to entry: The ρ1 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.
3.79
target pressure
dispenser (3.13) fuel pressure that the hydrogen fuelling protocol targets for the end of fuelling
Note 1 to entry: Further guidance on pressure terminology is included in Annex E.
3.80
vaporizer
device, other than a tank, that receives hydrogen in a liquid form and adds sufficient heat to convert the liquid to a gaseous state
3.81
maximum developed pressure
maximum accumulated pressure
highest pressure expected during fault management by the dispensing system (3.17)
Note 1 to entry: Per the GTR, the maximum developed pressure is 1,50 × NWP. See Annex D.
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.

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ICS 43.060.40; 71.100.20
Price based on 173 pages



ICS 43.060.40; 71.100.20
Price based on 173 pages