ISO/TS 20100:2008
(Main)Gaseous hydrogen - Fuelling stations
Gaseous hydrogen - Fuelling stations
ISO/TS 20100:2008 specifies the characteristics of outdoor public and non-public fuelling stations that dispense gaseous hydrogen used as fuel onboard land vehicles of all types. Residential and home applications to fuel land vehicles are not covered.
Carburant d'hydrogène gazeux — Stations-service
Plinasti vodik - Polnilne postaje
General Information
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Frequently Asked Questions
ISO/TS 20100:2008 is a technical specification published by the International Organization for Standardization (ISO). Its full title is "Gaseous hydrogen - Fuelling stations". This standard covers: ISO/TS 20100:2008 specifies the characteristics of outdoor public and non-public fuelling stations that dispense gaseous hydrogen used as fuel onboard land vehicles of all types. Residential and home applications to fuel land vehicles are not covered.
ISO/TS 20100:2008 specifies the characteristics of outdoor public and non-public fuelling stations that dispense gaseous hydrogen used as fuel onboard land vehicles of all types. Residential and home applications to fuel land vehicles are not covered.
ISO/TS 20100:2008 is classified under the following ICS (International Classification for Standards) categories: 43.060.40 - Fuel systems; 71.100.20 - Gases for industrial application. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO/TS 20100:2008 has the following relationships with other standards: It is inter standard links to ISO 9902-2:2001/Amd 2:2014, ISO/TS 19880-1:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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Standards Content (Sample)
TECHNICAL ISO/TS
SPECIFICATION 20100
First edition
2008-12-01
Gaseous hydrogen — Fuelling stations
Carburant d'hydrogène gazeux — Stations-service
Reference number
©
ISO 2008
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ii © ISO 2008 – All rights reserved
Contents Page
Foreword. v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions. 3
4 General design requirements . 7
5 Hydrogen delivery systems . 8
5.1 General. 8
5.2 Gaseous hydrogen supply by tube trailers and multi cylinder packs . 8
5.3 Liquid hydrogen supply . 9
5.4 Pipeline . 13
6 On-site generation . 13
6.1 Hydrogen generators using water electrolysis process. 13
6.2 Hydrogen generators using fuel processing technologies. 13
6.3 Shutdown control . 13
7 Hydrogen compressors. 14
7.1 General. 14
7.2 Vibration and movement. 14
7.3 Compressor enclosure ventilation. 14
7.4 Attachment to other buildings. 14
7.5 Enclosure access doors . 14
7.6 Control and monitoring. 14
8 Filters and separators . 15
9 Hydrogen purifier. 15
10 Gaseous hydrogen buffer storage tanks. 16
11 Dispenser, fuelling assembly, and process control. 16
11.1 Location and protection of dispensers . 16
11.2 Fuelling position . 16
11.3 Dispenser system design . 17
11.4 Fuelling hose assembly . 18
11.5 Hose breakaway device . 20
11.6 Fuelling connector. 21
11.7 Fuelling process control . 22
11.8 Dispenser safety devices. 22
11.9 Safety notices at fuelling point. 24
12 Hydrogen fuel specifications. 25
13 Layout . 25
13.1 General. 25
13.2 Safety distances. 25
14 Fire and explosion hazard protection requirements. 30
14.1 General requirements. 30
14.2 Area classification . 30
14.3 Protection requirements for equipment within classified areas. 30
14.4 Prevention of the accumulation of ignitable mixtures indoors and in enclosures. 30
14.5 Ventilation specification . 31
14.6 Start-up purge . 32
14.7 Areas adjacent to hazardous areas. 32
14.8 Hydrogen detection systems. 32
14.9 Safety of personnel. 33
15 Hydrogen storage siting requirements. 33
15.1 Ground storage . 33
15.2 Below-ground vaults. 33
15.3 Fuelling station canopy-top storage . 34
15.4 Roof-top installation of gaseous hydrogen systems . 35
16 General equipment requirements. 36
16.1 Materials. 36
16.2 Piping carrying gaseous hydrogen. 37
16.3 Pressure relief devices for gaseous hydrogen systems . 37
16.4 Protection from the accumulation of static charges. 38
16.5 Equipment grounding and bonding . 38
16.6 Valves for gaseous hydrogen. 38
16.7 Instruments and cabinets. 39
17 Gaseous hydrogen vent systems. 39
18 Instrumentation control and safety systems . 39
18.1 General . 39
18.2 Master system . 40
18.3 Alarms . 40
18.4 Pneumatics . 41
18.5 Safety systems . 41
18.6 Instrumentation . 41
18.7 Safety functions control . 41
19 Electrical systems (electrical equipment and wiring) . 42
19.1 General requirements . 42
19.2 Power supply. 42
19.3 Electromagnetic compatibility and interference (EMC) . 42
20 Safety systems . 42
20.1 Emergency principles and operations. 42
20.2 Fire detection systems . 43
20.3 Safety and emergency shut-off systems . 43
20.4 Emergency release of gas from gaseous hydrogen buffer storage tanks. 43
20.5 Fire-fighting systems. 43
21 Protection from external effects. 44
21.1 General principles. 44
21.2 Lightning protection . 44
21.3 Protection from environmental conditions . 44
22 Tests. 44
22.1 Pressure test. 44
22.2 Leak test. 45
22.3 Testing of electrotechnical control/safety/emergency systems and components . 45
Bibliography . 46
iv © ISO 2008 – All rights reserved
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of document:
⎯ an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
⎯ an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting
a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
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.
ISO/TS 20100 was prepared by Technical Committee ISO/TC 197, Hydrogen technologies.
TECHNICAL SPECIFICATION ISO/TS 20100:2008(E)
Gaseous hydrogen — Fuelling stations
1 Scope
This Technical Specification specifies the characteristics of outdoor public and non-public fuelling stations that
dispense gaseous hydrogen used as fuel onboard land vehicles of all types.
Residential and home applications to fuel land vehicles are excluded from this Technical Specification.
The fuelling station may comprise, as applicable, the following as shown in Figure 1:
⎯ Delivery of hydrogen by pipeline, trucked-in gaseous and/or liquid hydrogen;
⎯ On-site hydrogen generators using water electrolysis process or hydrogen generators using fuel
processing technologies;
⎯ Liquid hydrogen storage, pumping and vaporizing systems;
⎯ Gaseous hydrogen compression and purification systems;
NOTE When the fuelling station comprises an on-site hydrogen generator, the compressor/purifier system is
commonly integrated into it.
⎯ Gaseous hydrogen buffer storage;
⎯ Gaseous hydrogen dispensers.
Figure 1 — Gaseous hydrogen — Fuelling station
2 Normative references
The following referenced documents are indispensable for the application 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 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves
ISO 4126-2, Safety devices for protection against excessive pressure — Part 2: Bursting disc safety devices
ISO 4414, Pneumatic fluid power — General rules relating to systems
ISO 7751, Rubber and plastics hoses and hose assemblies — Ratios of proof and burst pressure to design
working pressure
ISO 14113, Gas welding equipment — Rubber and plastic hoses assembled for compressed or liquefied
gases up to a maximum design pressure of 450 bar
ISO 14687 (all parts), Hydrogen fuel — Product specification
ISO 15649, Petroleum and natural gas industries — Piping
ISO 16110-1, Hydrogen generators using fuel processing technologies — Part 1: Safety
ISO 16528-1, Boilers and pressure vessels — Part 1: Performance requirements
ISO 17268, Compressed hydrogen surface vehicle refuelling connection devices
ISO 21009-1, Cryogenic vessels — Static vacuum-insulated vessels — Part 1: Design, fabrication, inspection
and tests
ISO 21011, Cryogenic vessels — Valves for cryogenic service
ISO 21012, Cryogenic vessels — Hoses
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 22734-1, Hydrogen generators using water electrolysis process — Part 1: Industrial and commercial
applications
IEC 60079-0, Explosive atmospheres — Part 0: Equipment — General requirements
IEC 60079-10, Electrical apparatus for explosive gas atmospheres — Part 10: Classification of hazardous
areas
IEC 60079-14, Explosive atmospheres — Part 14: Electrical installations design, selection and erection
IEC 60079-29-1, Explosive atmospheres — Part 29-1: Gas detectors — Performance requirements of
detectors for flammable gases
IEC 60079-29-2, Explosive atmospheres — Part 29-2: Gas detectors — Selection, installation, use and
maintenance of detectors for flammable gases and oxygen
2 © ISO 2008 – All rights reserved
IEC 60079-30-1, Explosive atmospheres — Part 30-1: Electrical resistance trace heating — General and
testing requirements
IEC 60204-1, Safety of Machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60364-4-41, Low-voltage electrical installations — Part 4-41: Protection for safety — Protection against
electric shock
IEC 60445, Basic and safety principles for man-machine interface, marking and identification — Identification
of equipment terminals and conductor terminations
IEC 60446, Basic and safety principles for man-machine interface, marking and identification — Identification
of conductors by colours or alphanumerics
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 61000-6-1, Electromagnetic compatibility (EMC) — Part 6-1: Generic standards — Immunity for
residential, commercial and light-industrial environments
IEC 61000-6-3, Electromagnetic compatibility (EMC) — Part 6-3: Generic standards — Emission standard for
residential, commercial and light-industrial environments
IEC 61069-7, Industrial-process measurement and control — Evaluation of system properties for the purpose
of system assessment — Part 7: Assessment of system safety
IEC 61508, Functional safety of electrical/electronic/programmable electronic safety-related systems
IEC 61511-1, Functional safety — Safety instrumented systems for the process industry sector — Part 1:
Framework, definitions, system, hardware and software requirements
IEC 62305-3, Protection against lightning — Part 3: Physical damage to structures and life hazard
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
accessory
part capable of performing an independent function and contributing to the operations of the equipment that it
serves
3.2
authority having jurisdiction
organization, office or individual responsible for approving a facility along with an equipment, an installation or
a procedure
3.3
bleed venting
expiration or inspiration of air or gas from, or to, one side of a diaphragm of any accessory, component or
equipment such as a valve, pressure regulator or switch
3.4
buffer storage tanks
pressurized tanks, 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 dispenser for accumulation of pressurized gas supply
for vehicle fuelling
3.5
control system
system that is intended to automatically operate the fuelling station within its normal operating parameters
NOTE The control system includes the measuring, monitoring and reporting and recording functions, as applicable.
3.6
design pressure
maximum pressure permissible in a storage vessel (at its top) or a piping system for a designated temperature
NOTE 1 The design pressure is the basis for the pressure setting of the pressure relief devices protecting the vessel or
piping system.
NOTE 2 The design pressure may also be the maximum allowable operating pressure rating of pressure vessels
manufactured in accordance with national pressure vessel codes.
3.7
dispenser
parts of the pressurized-gas fuelling station via which the pressurized gas is dispensed to vehicles
NOTE As an example, the dispenser may include a dispenser cabinet, a gas flow meter, a fuelling hose and fuelling
nozzle attachments.
3.8
dispenser cabinet
protective housing that encloses the dispenser gas containing equipment
3.9
dispensing system
system comprising all equipment necessary to carry out the vehicle fuelling operation, downstream of the
hydrogen supply system
3.10
enclosure
structure that protects equipment from the environment, provides noise attenuation, or provides safety to the
areas surrounding the equipment
3.11
fail-safe
design feature that ensures that safe operating conditions are maintained in the event of a malfunction of
control devices or an interruption of a supply source
3.12
fill pressure
pressure attained at the end of filling
NOTE Fill pressure varies according to the gas temperature in the vehicle tank, which is dependent on the changing
parameters and the ambient conditions.
3.13
forecourt
hard surfaced area at the front of the vehicle fuelling position, including any area underneath a canopy
3.14
fuelling connector
joined assembly of the fuelling nozzle and fuelling receptacle, which permits quick connect and disconnect of
the fuel supply to the vehicle or storage system
4 © ISO 2008 – All rights reserved
3.15
fuelling hose
flexible conduit used for dispensing gaseous hydrogen to vehicles through a fuelling nozzle
3.16
fuelling nozzle
mating part of the fuelling connector at the fuelling station, including shut-off valves, that connects the fuelling
hose to the vehicle fuelling receptacle for the transfer of hydrogen fuel
3.17
fuelling receptacle
mating part of the fuelling connector mounted on a vehicle
3.18
fuelling position
area adjacent to the hydrogen dispensers, where customers park their vehicles for fuelling
3.19
fuelling station
facility for the dispensing of compressed hydrogen, which includes all stationary equipment that supplies,
compresses, stores and dispenses gaseous hydrogen to fuel a land vehicle
3.20
guard
part of a machine specially used to provide protection by means of a physical barrier
NOTE Depending on its construction, a guard may be called casing, cover, screen, door, enclosed guard, etc.
3.21
harm
physical injury or damage to the health of people, or damage to property or to the environment
3.22
hazard
potential source of harm
3.23
hazardous event
occurrence in which a hazardous situation results in harm
3.24
hazardous situation
circumstance in which people, property or the environment are exposed to one or more hazards
3.25
hose breakaway device
component installed downstream of the dispenser outlet connection to protect the dispenser assembly from
damage by vehicles driving away while still connected to the dispenser nozzle
3.26
housing
section of a system that encloses, and is intended to protect, operating parts, control mechanisms, or other
components, which need not be accessible during normal operation
3.27
hydrogen purifier
equipment to remove oxygen, moisture and other impurities from the hydrogen
3.28
manufacturer
person or organization responsible for the design, fabrication and testing of equipment and components
3.29
maximum fill pressure
maximum pressure to which a vehicle tank may be filled
3.30
mechanically actuating safety equipment
mechanically actuating equipment that prevents fuelling station operation outside specified acceptable
maximum or minimum operating pressures or that prevents a gas leakage in the event of an incident
3.31
nominal working pressure
nominal working pressure is the vehicle tank pressure, as specified by the manufacturer, at a uniform gas
temperature of 15 °C or as specified and at full gas content
3.32
non-public fuelling station
fuelling station that does not sell or dispense gaseous hydrogen to the general public, e.g. private or municipal
vehicle fleet operation
3.33
operator
licensed person or organization responsible for the safe operation, maintenance and housekeeping of the
fuelling station
3.34
outdoors
location outside of any building or structure, or locations under a roof, weather shelter, or canopy provided this
area is not enclosed on more than two sides
3.35
plinth
raised area on the forecourt, supporting and protecting the dispensers and associated equipment
3.36
pressure relief device
device designed to open to prevent a rise of internal pressure in excess of a specified value due to emergency
or abnormal conditions
NOTE The pressure relief device can be of the re-closing or other type, such as one having a rupture disk and/or
fusible plug that requires replacement after each use.
3.37
public fuelling station
fuelling station that sells gaseous hydrogen to the general public
3.38
risk
combination of the probability of occurrence of harm and the severity of that harm
3.39
safeguarding
use of specific technical means to protect persons from the hazards which cannot reasonably be removed or
sufficiently limited by design
6 © ISO 2008 – All rights reserved
3.40
safety
freedom from unacceptable risk
3.41
safety device
device other than a guard, which eliminates or reduces risk, alone or associated with the guard
3.42
safety distance
minimum separation between a hazard source and an object (human, equipment or environment), which will
mitigate the effect of a likely foreseeable incident and prevent a minor incident from escalating into a larger
incident
3.43
safety function
function to be implemented by a safety-instrumented system, other technology safety-related system or
external risk reduction facilities, which is intended to achieve or maintain a safe state for the process with
respect to a specific hazardous situation
3.44
safety-instrumented system
instrumented system used to implement one or more safety-instrumented functions
NOTE A safety-instrument system is composed of any combination of sensors, logic solvers, and final elements.
3.45
safety measures
combination of the measures incorporated at the design stage and those measures required to be
implemented by the user
3.46
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
NOTE Hydrogen purifiers may comprise purification vessels, dryers, filters and separators.
4 General design requirements
The hydrogen fuelling station installation shall be sited to minimize risk to users, operating personnel, and
neighbouring personnel, residents and property.
Consideration shall be given to any potential hazard or risk in relation to the location and operation of the
facility.
More specifically, measures to reduce fire and explosion risks shall be applied in the following order of priority:
⎯ prevention of the formation of a flammable or explosive mixture and reduction of the explosion strength
potential of explosive atmospheres generated by potential leaks or releases;
⎯ avoidance of ignition sources;
⎯ mitigation of the effects of a fire or explosion.
Installation and equipment design shall minimize the number of connections and other possible points of
leakage or release to atmosphere.
Configurations generating the possibility of a hazardous confined explosive atmosphere shall be avoided.
Fire and explosion risk prevention shall take into account foreseeable malfunctions and misuse.
The installation shall be such that, for any foreseeable deviation involving fire and explosion hazards, it shall
be possible to define a safe action towards prevention of escalation.
Where an explosive mixture could persist within a fuelling station enclosure after an accidental release of
hydrogen despite existing means of detection, isolation and ventilation, explosion relief shall be provided to
reduce the consequences of an explosion.
5 Hydrogen delivery systems
5.1 General
5.1.1 Access to the hydrogen delivery and storage areas
The installation shall be so designed that authorized personnel shall have easy access to and exit from the
operating area of the installation at all times.
The hydrogen delivery and storage area shall be located so that it is readily accessible to mobile supply
equipment at ground level and to authorized personnel. Suitable roadways or other means of access for
emergency equipment, such as fire department apparatus, shall be provided.
Where fencing is provided to prevent access of unauthorized persons, the minimum clearance between the
fence and the installation shall be 0,8 m to allow free access to and escape from the enclosure.
Adequate means of escape in the case of emergency shall be provided. In cases where authorized personnel
can be trapped inside compounds, there shall be at least two separate outward opening exits, remote from
each other, strategically placed in relation to the degree of hazard considered.
All gates shall be outward opening and wide enough to provide for the easy access and exit of authorized
personnel. Gates shall not allow entry without a key during normal operation.
Consideration shall be given to the provision of an additional emergency exit where the size of the fenced
area or equipment location necessitates this.
Access to the installation shall be prevented to all unauthorized persons. Warning notices shall support this.
Timber or other readily combustible materials shall not be used for fencing. The height of the fencing should
be at least 2 m.
5.1.2 Electrical grounding
All delivery vehicles shall be electrically connected to the ground prior to flexible hose connection.
The effectiveness of the grounding connection shall be checked at least once every three years.
5.2 Gaseous hydrogen supply by tube trailers and multi cylinder packs
5.2.1 Tube trailers
Hydrogen tube trailers shall be stationed in an area that is accessible to hydrogen distribution tractors and fire-
fighting services at all times.
Safety distances shall comply with those given in 13.2.2 for gaseous hydrogen systems.
Minimum clearance of 1 m shall be maintained on all sides of each tube trailer.
8 © ISO 2008 – All rights reserved
The tube trailer stationing area shall be level and horizontal. The front and rear ends of the tube trailer bays
shall be kept open. A bump stop shall indicate normal tube trailer position.
The location of the pressure reducing station shall be accessible.
Hydrogen tube trailers shall not be stationed outside of the designated trailer unloading bays.
A designated temporary tube trailer parking location shall be provided for carrying out tube trailer exchange
without interfering with fuelling operations, unless the fuelling activity is fully suspended during the tube trailer
exchange operation.
These temporary tube trailer parking locations shall not be located near buildings where persons are present
or near any potentially hazardous processes, sources of fuel, flammable gases or liquids.
5.2.2 Multi cylinder pack
Multi cylinder pack trailers shall be electrically connected to ground prior to flexible hose connection.
The storage area shall be fenced to prevent access of unauthorized persons. Activities other than those
directly related to the hydrogen tube trailer operation shall not be permitted in the vicinity of the trailers.
5.3 Liquid hydrogen supply
5.3.1 Liquid hydrogen storage layout and design features
To minimize the consequence of an accidental leakage, liquid hydrogen storage tanks should not be
enveloped or constricted by walls or buildings. Liquid hydrogen (storage tanks in 2- or 3-sided zone) should
also be avoided as much as possible to prevent accidental gas confinement if leakage occurs.
Safety distances shall comply with those given in 13.2.1 for liquid hydrogen systems.
For access and inspection, a minimum clearance of 1 m shall be maintained on all sides of each storage tank.
Any firebreak walls or partitions shall be made of brick, concrete or any other suitable non-combustible
material of 90 min rating.
The liquid hydrogen storage tanks shall be protected against vehicular impact by barriers or bollards.
Filling connections and equipment controls shall be accessible.
Connections and equipment controls necessary for filling purposes shall be located in close proximity to each
other and in such a way that the storage tank and tanker controls are visible and accessible from the
operator's position.
Dykes, diversion kerbs or grading shall be used to ensure that liquid leakage from adjacent combustible liquid
or liquid oxygen storages installed at a higher level than the liquid hydrogen storage is prevented from
accumulating within 15 m of the liquid hydrogen storage.
The liquid hydrogen storage tanks shall comply with ISO 21009-1.
5.3.2 Liquid hydrogen transfer area
The liquid hydrogen transfer area shall be designated a “NO PARKING” area.
The tanker, when in position for discharging to the installation, shall be in the open and not be in a walled
enclosure from which the escape of liquid or cold vapour is restricted. Tankers shall have easy access to, and
exit from, the installation at all times.
A concrete hard standing area shall be located adjacent to the fill coupling of the liquid hydrogen storage tank.
The fill coupling shall be located within the area of the liquid hydrogen storage tank plinth.
The liquid hydrogen transfer area shall be clearly defined, and transfer of liquid shall only take place within the
fuelling station premises.
5.3.3 Tank foundation and supports
Where liquid hydrogen storage tanks are required to be elevated, the tank supports shall be non-combustible
structures capable of withstanding damage by cryogenic liquid spillage.
The tank foundation shall be designed to withstand the weight of the liquid hydrogen storage tank, its contents
and other possible loads applied by wind, snow, etc.
The plinth on which the liquid hydrogen storage tank is installed shall be made of concrete or any other
suitable non-combustible material.
5.3.4 Liquid hydrogen delivery lines
Flexible hoses used for liquid hydrogen delivery shall comply with ISO 21012.
Liquid hydrogen delivery lines shall include a non-return valve or an emergency isolating device preventing
outflow in case of hose rupture.
5.3.5 Pressure relief devices
Pressure relief devices shall be provided to prevent over-pressure, including situations where liquid can be
trapped.
Pressure relief devices and vent piping shall be designed or located so that moisture cannot collect and freeze
in a manner which would interfere with proper operation of the pressure relief device.
A secondary pressure relief device shall be installed together with the primary pressure relief device of the
liquid hydrogen storage tank.
Safety valves shall comply with ISO 21013-1. Bursting disks shall comply with ISO 21013-2. Sizing and
capacity determination of safety valves and bursting disks shall meet the requirements of ISO 21013-3.
If a three-way valve is installed to accommodate two pressure relief devices operating either simultaneously or
alternatively, the size of the three-way valve, regardless of the position of the actuating device, shall be such
that the liquid hydrogen storage tank is adequately protected.
The three-way valve shall be provided with a position indicator, if appropriate, showing which pressure relief
devices are “on line”.
Consideration shall also be given in the design of the installation to facilitate the periodic testing of the
pressure relief devices.
Bursting disk material shall be compatible with hydrogen. Bursting disks shall be replaced every five years.
5.3.6 Cold hydrogen vents
All vents, including those of pressure relief devices and purge valves, shall be connected to a vent stack.
The vent stack shall be arranged to discharge in a safe place in the open air so as to prevent impingement of
escaping gas onto personnel or any structure. The vent stack shall not discharge where accumulation of
hydrogen can occur, such as below the eaves of buildings. Consideration shall be given to the prevention of
accumulation of water, including that from condensation, in the vent stack outlet.
10 © ISO 2008 – All rights reserved
The position of the vent stacks shall be taken into account in the siting of the installation and reflected in the
areas-classification drawing.
The vent stacks shall be dedicated to the liquid hydrogen installation and not be connected to other vent
stacks to avoid any back feed into the hydrogen vent stacks.
The outlet of the vent stacks shall not be equipped with devices that disturb the natural buoyancy of hydrogen.
5.3.7 Piping, fittings, valves, regulator for cryogenic service
Means shall be provided to minimize exposure of personnel to piping operating at low temperatures and to
prevent air condensate from contacting piping, structural members and surfaces not suitable for cryogenic
temperatures.
Uninsulated piping and equipment which operates at below air condensation temperature shall not be installed
above asphalt surfaces or other combustible materials in order to prevent contact of liquid air with such
materials. For the purposes of this Technical Specification, asphalt and bitumastic paving shall be considered
combustible. If expansion joints are used, fillers shall also be made of non-combustible materials. Drip pans
may be installed under uninsulated piping and equipment to retain and vaporize condensed liquid air.
Valves used for cryogenic service is shall comply with ISO 21011.
5.3.8 Cryogenic pumps
Foundations and sumps for cryogenic pumps shall be designed and constructed to prevent frost heaving.
Surfaces located under the pump’s connections and under uninsulated hydrogen piping shall be constructed
of non-combustible materials as specified in 5.3.7.
The following markings shall be clearly displayed and visible at all times near the cryogenic pump:
⎯ LIQUID HYDROGEN;
⎯ FLAMMABLE LIQUID;
⎯ NO SMOKING;
⎯ NO SOURCES OF IGNITION;
⎯ AUTHORIZED PERSONS ONLY;
⎯ Product identification.
Each cryogenic pump shall be provided with a vent and a pressure relief valve that will prevent over-
pressurizing of the pump case under all conditions including the maximum possible rate of cool-down.
5.3.9 Vaporizer
The vaporizer and its piping shall be protected with pressure relief devices as required.
Pressure relief valves on heated vaporizers shall be located so that they are not subjected to temperatures
exceeding 60 °C during normal operation unless they are designed to withstand higher temperatures.
The vaporizer shall be sized for the maximum flow requirement specified for cryogenic pumps. It shall be
designed to function as required despite accumulation of ice due to condensation of ambient moisture.
Where necessary, a device shall be installed to ensure that cold gas temperature exiting the vaporizer cannot:
⎯ cause damage to pipework and equipment downstream;
⎯ affect the dispensing process.
All the liquid-hydrogen wetted parts of the vaporizer shall be made of austenitic stainless steel e.g. Type 316L.
Heat used in the vaporizer shall be indirectly supplied utilizing media such as air, steam, water, or water
solutions.
A low temperature shut-off switch or valve shall be provided in the vaporizer discharge piping to prevent flow
of liq
...
SLOVENSKI STANDARD
01-junij-2020
Plinasti vodik - Polnilne postaje
Gaseous hydrogen - Fuelling stations
Carburant d'hydrogène gazeux - Stations-service
Ta slovenski standard je istoveten z: ISO/TS 20100:2008
ICS:
27.075 Tehnologija vodika Hydrogen technologies
71.100.20 Industrijski plini Gases for industrial
application
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL ISO/TS
SPECIFICATION 20100
First edition
2008-12-01
Gaseous hydrogen — Fuelling stations
Carburant d'hydrogène gazeux — Stations-service
Reference number
©
ISO 2008
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ii © ISO 2008 – All rights reserved
Contents Page
Foreword. v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions. 3
4 General design requirements . 7
5 Hydrogen delivery systems . 8
5.1 General. 8
5.2 Gaseous hydrogen supply by tube trailers and multi cylinder packs . 8
5.3 Liquid hydrogen supply . 9
5.4 Pipeline . 13
6 On-site generation . 13
6.1 Hydrogen generators using water electrolysis process. 13
6.2 Hydrogen generators using fuel processing technologies. 13
6.3 Shutdown control . 13
7 Hydrogen compressors. 14
7.1 General. 14
7.2 Vibration and movement. 14
7.3 Compressor enclosure ventilation. 14
7.4 Attachment to other buildings. 14
7.5 Enclosure access doors . 14
7.6 Control and monitoring. 14
8 Filters and separators . 15
9 Hydrogen purifier. 15
10 Gaseous hydrogen buffer storage tanks. 16
11 Dispenser, fuelling assembly, and process control. 16
11.1 Location and protection of dispensers . 16
11.2 Fuelling position . 16
11.3 Dispenser system design . 17
11.4 Fuelling hose assembly . 18
11.5 Hose breakaway device . 20
11.6 Fuelling connector. 21
11.7 Fuelling process control . 22
11.8 Dispenser safety devices. 22
11.9 Safety notices at fuelling point. 24
12 Hydrogen fuel specifications. 25
13 Layout . 25
13.1 General. 25
13.2 Safety distances. 25
14 Fire and explosion hazard protection requirements. 30
14.1 General requirements. 30
14.2 Area classification . 30
14.3 Protection requirements for equipment within classified areas. 30
14.4 Prevention of the accumulation of ignitable mixtures indoors and in enclosures. 30
14.5 Ventilation specification . 31
14.6 Start-up purge . 32
14.7 Areas adjacent to hazardous areas. 32
14.8 Hydrogen detection systems. 32
14.9 Safety of personnel. 33
15 Hydrogen storage siting requirements. 33
15.1 Ground storage . 33
15.2 Below-ground vaults. 33
15.3 Fuelling station canopy-top storage . 34
15.4 Roof-top installation of gaseous hydrogen systems . 35
16 General equipment requirements. 36
16.1 Materials. 36
16.2 Piping carrying gaseous hydrogen. 37
16.3 Pressure relief devices for gaseous hydrogen systems . 37
16.4 Protection from the accumulation of static charges. 38
16.5 Equipment grounding and bonding . 38
16.6 Valves for gaseous hydrogen. 38
16.7 Instruments and cabinets. 39
17 Gaseous hydrogen vent systems. 39
18 Instrumentation control and safety systems . 39
18.1 General . 39
18.2 Master system . 40
18.3 Alarms . 40
18.4 Pneumatics . 41
18.5 Safety systems . 41
18.6 Instrumentation . 41
18.7 Safety functions control . 41
19 Electrical systems (electrical equipment and wiring) . 42
19.1 General requirements . 42
19.2 Power supply. 42
19.3 Electromagnetic compatibility and interference (EMC) . 42
20 Safety systems . 42
20.1 Emergency principles and operations. 42
20.2 Fire detection systems . 43
20.3 Safety and emergency shut-off systems . 43
20.4 Emergency release of gas from gaseous hydrogen buffer storage tanks. 43
20.5 Fire-fighting systems. 43
21 Protection from external effects. 44
21.1 General principles. 44
21.2 Lightning protection . 44
21.3 Protection from environmental conditions . 44
22 Tests. 44
22.1 Pressure test. 44
22.2 Leak test. 45
22.3 Testing of electrotechnical control/safety/emergency systems and components . 45
Bibliography . 46
iv © ISO 2008 – All rights reserved
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of document:
⎯ an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
⎯ an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting
a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
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.
ISO/TS 20100 was prepared by Technical Committee ISO/TC 197, Hydrogen technologies.
TECHNICAL SPECIFICATION ISO/TS 20100:2008(E)
Gaseous hydrogen — Fuelling stations
1 Scope
This Technical Specification specifies the characteristics of outdoor public and non-public fuelling stations that
dispense gaseous hydrogen used as fuel onboard land vehicles of all types.
Residential and home applications to fuel land vehicles are excluded from this Technical Specification.
The fuelling station may comprise, as applicable, the following as shown in Figure 1:
⎯ Delivery of hydrogen by pipeline, trucked-in gaseous and/or liquid hydrogen;
⎯ On-site hydrogen generators using water electrolysis process or hydrogen generators using fuel
processing technologies;
⎯ Liquid hydrogen storage, pumping and vaporizing systems;
⎯ Gaseous hydrogen compression and purification systems;
NOTE When the fuelling station comprises an on-site hydrogen generator, the compressor/purifier system is
commonly integrated into it.
⎯ Gaseous hydrogen buffer storage;
⎯ Gaseous hydrogen dispensers.
Figure 1 — Gaseous hydrogen — Fuelling station
2 Normative references
The following referenced documents are indispensable for the application 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 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves
ISO 4126-2, Safety devices for protection against excessive pressure — Part 2: Bursting disc safety devices
ISO 4414, Pneumatic fluid power — General rules relating to systems
ISO 7751, Rubber and plastics hoses and hose assemblies — Ratios of proof and burst pressure to design
working pressure
ISO 14113, Gas welding equipment — Rubber and plastic hoses assembled for compressed or liquefied
gases up to a maximum design pressure of 450 bar
ISO 14687 (all parts), Hydrogen fuel — Product specification
ISO 15649, Petroleum and natural gas industries — Piping
ISO 16110-1, Hydrogen generators using fuel processing technologies — Part 1: Safety
ISO 16528-1, Boilers and pressure vessels — Part 1: Performance requirements
ISO 17268, Compressed hydrogen surface vehicle refuelling connection devices
ISO 21009-1, Cryogenic vessels — Static vacuum-insulated vessels — Part 1: Design, fabrication, inspection
and tests
ISO 21011, Cryogenic vessels — Valves for cryogenic service
ISO 21012, Cryogenic vessels — Hoses
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 22734-1, Hydrogen generators using water electrolysis process — Part 1: Industrial and commercial
applications
IEC 60079-0, Explosive atmospheres — Part 0: Equipment — General requirements
IEC 60079-10, Electrical apparatus for explosive gas atmospheres — Part 10: Classification of hazardous
areas
IEC 60079-14, Explosive atmospheres — Part 14: Electrical installations design, selection and erection
IEC 60079-29-1, Explosive atmospheres — Part 29-1: Gas detectors — Performance requirements of
detectors for flammable gases
IEC 60079-29-2, Explosive atmospheres — Part 29-2: Gas detectors — Selection, installation, use and
maintenance of detectors for flammable gases and oxygen
2 © ISO 2008 – All rights reserved
IEC 60079-30-1, Explosive atmospheres — Part 30-1: Electrical resistance trace heating — General and
testing requirements
IEC 60204-1, Safety of Machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60364-4-41, Low-voltage electrical installations — Part 4-41: Protection for safety — Protection against
electric shock
IEC 60445, Basic and safety principles for man-machine interface, marking and identification — Identification
of equipment terminals and conductor terminations
IEC 60446, Basic and safety principles for man-machine interface, marking and identification — Identification
of conductors by colours or alphanumerics
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 61000-6-1, Electromagnetic compatibility (EMC) — Part 6-1: Generic standards — Immunity for
residential, commercial and light-industrial environments
IEC 61000-6-3, Electromagnetic compatibility (EMC) — Part 6-3: Generic standards — Emission standard for
residential, commercial and light-industrial environments
IEC 61069-7, Industrial-process measurement and control — Evaluation of system properties for the purpose
of system assessment — Part 7: Assessment of system safety
IEC 61508, Functional safety of electrical/electronic/programmable electronic safety-related systems
IEC 61511-1, Functional safety — Safety instrumented systems for the process industry sector — Part 1:
Framework, definitions, system, hardware and software requirements
IEC 62305-3, Protection against lightning — Part 3: Physical damage to structures and life hazard
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
accessory
part capable of performing an independent function and contributing to the operations of the equipment that it
serves
3.2
authority having jurisdiction
organization, office or individual responsible for approving a facility along with an equipment, an installation or
a procedure
3.3
bleed venting
expiration or inspiration of air or gas from, or to, one side of a diaphragm of any accessory, component or
equipment such as a valve, pressure regulator or switch
3.4
buffer storage tanks
pressurized tanks, 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 dispenser for accumulation of pressurized gas supply
for vehicle fuelling
3.5
control system
system that is intended to automatically operate the fuelling station within its normal operating parameters
NOTE The control system includes the measuring, monitoring and reporting and recording functions, as applicable.
3.6
design pressure
maximum pressure permissible in a storage vessel (at its top) or a piping system for a designated temperature
NOTE 1 The design pressure is the basis for the pressure setting of the pressure relief devices protecting the vessel or
piping system.
NOTE 2 The design pressure may also be the maximum allowable operating pressure rating of pressure vessels
manufactured in accordance with national pressure vessel codes.
3.7
dispenser
parts of the pressurized-gas fuelling station via which the pressurized gas is dispensed to vehicles
NOTE As an example, the dispenser may include a dispenser cabinet, a gas flow meter, a fuelling hose and fuelling
nozzle attachments.
3.8
dispenser cabinet
protective housing that encloses the dispenser gas containing equipment
3.9
dispensing system
system comprising all equipment necessary to carry out the vehicle fuelling operation, downstream of the
hydrogen supply system
3.10
enclosure
structure that protects equipment from the environment, provides noise attenuation, or provides safety to the
areas surrounding the equipment
3.11
fail-safe
design feature that ensures that safe operating conditions are maintained in the event of a malfunction of
control devices or an interruption of a supply source
3.12
fill pressure
pressure attained at the end of filling
NOTE Fill pressure varies according to the gas temperature in the vehicle tank, which is dependent on the changing
parameters and the ambient conditions.
3.13
forecourt
hard surfaced area at the front of the vehicle fuelling position, including any area underneath a canopy
3.14
fuelling connector
joined assembly of the fuelling nozzle and fuelling receptacle, which permits quick connect and disconnect of
the fuel supply to the vehicle or storage system
4 © ISO 2008 – All rights reserved
3.15
fuelling hose
flexible conduit used for dispensing gaseous hydrogen to vehicles through a fuelling nozzle
3.16
fuelling nozzle
mating part of the fuelling connector at the fuelling station, including shut-off valves, that connects the fuelling
hose to the vehicle fuelling receptacle for the transfer of hydrogen fuel
3.17
fuelling receptacle
mating part of the fuelling connector mounted on a vehicle
3.18
fuelling position
area adjacent to the hydrogen dispensers, where customers park their vehicles for fuelling
3.19
fuelling station
facility for the dispensing of compressed hydrogen, which includes all stationary equipment that supplies,
compresses, stores and dispenses gaseous hydrogen to fuel a land vehicle
3.20
guard
part of a machine specially used to provide protection by means of a physical barrier
NOTE Depending on its construction, a guard may be called casing, cover, screen, door, enclosed guard, etc.
3.21
harm
physical injury or damage to the health of people, or damage to property or to the environment
3.22
hazard
potential source of harm
3.23
hazardous event
occurrence in which a hazardous situation results in harm
3.24
hazardous situation
circumstance in which people, property or the environment are exposed to one or more hazards
3.25
hose breakaway device
component installed downstream of the dispenser outlet connection to protect the dispenser assembly from
damage by vehicles driving away while still connected to the dispenser nozzle
3.26
housing
section of a system that encloses, and is intended to protect, operating parts, control mechanisms, or other
components, which need not be accessible during normal operation
3.27
hydrogen purifier
equipment to remove oxygen, moisture and other impurities from the hydrogen
3.28
manufacturer
person or organization responsible for the design, fabrication and testing of equipment and components
3.29
maximum fill pressure
maximum pressure to which a vehicle tank may be filled
3.30
mechanically actuating safety equipment
mechanically actuating equipment that prevents fuelling station operation outside specified acceptable
maximum or minimum operating pressures or that prevents a gas leakage in the event of an incident
3.31
nominal working pressure
nominal working pressure is the vehicle tank pressure, as specified by the manufacturer, at a uniform gas
temperature of 15 °C or as specified and at full gas content
3.32
non-public fuelling station
fuelling station that does not sell or dispense gaseous hydrogen to the general public, e.g. private or municipal
vehicle fleet operation
3.33
operator
licensed person or organization responsible for the safe operation, maintenance and housekeeping of the
fuelling station
3.34
outdoors
location outside of any building or structure, or locations under a roof, weather shelter, or canopy provided this
area is not enclosed on more than two sides
3.35
plinth
raised area on the forecourt, supporting and protecting the dispensers and associated equipment
3.36
pressure relief device
device designed to open to prevent a rise of internal pressure in excess of a specified value due to emergency
or abnormal conditions
NOTE The pressure relief device can be of the re-closing or other type, such as one having a rupture disk and/or
fusible plug that requires replacement after each use.
3.37
public fuelling station
fuelling station that sells gaseous hydrogen to the general public
3.38
risk
combination of the probability of occurrence of harm and the severity of that harm
3.39
safeguarding
use of specific technical means to protect persons from the hazards which cannot reasonably be removed or
sufficiently limited by design
6 © ISO 2008 – All rights reserved
3.40
safety
freedom from unacceptable risk
3.41
safety device
device other than a guard, which eliminates or reduces risk, alone or associated with the guard
3.42
safety distance
minimum separation between a hazard source and an object (human, equipment or environment), which will
mitigate the effect of a likely foreseeable incident and prevent a minor incident from escalating into a larger
incident
3.43
safety function
function to be implemented by a safety-instrumented system, other technology safety-related system or
external risk reduction facilities, which is intended to achieve or maintain a safe state for the process with
respect to a specific hazardous situation
3.44
safety-instrumented system
instrumented system used to implement one or more safety-instrumented functions
NOTE A safety-instrument system is composed of any combination of sensors, logic solvers, and final elements.
3.45
safety measures
combination of the measures incorporated at the design stage and those measures required to be
implemented by the user
3.46
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
NOTE Hydrogen purifiers may comprise purification vessels, dryers, filters and separators.
4 General design requirements
The hydrogen fuelling station installation shall be sited to minimize risk to users, operating personnel, and
neighbouring personnel, residents and property.
Consideration shall be given to any potential hazard or risk in relation to the location and operation of the
facility.
More specifically, measures to reduce fire and explosion risks shall be applied in the following order of priority:
⎯ prevention of the formation of a flammable or explosive mixture and reduction of the explosion strength
potential of explosive atmospheres generated by potential leaks or releases;
⎯ avoidance of ignition sources;
⎯ mitigation of the effects of a fire or explosion.
Installation and equipment design shall minimize the number of connections and other possible points of
leakage or release to atmosphere.
Configurations generating the possibility of a hazardous confined explosive atmosphere shall be avoided.
Fire and explosion risk prevention shall take into account foreseeable malfunctions and misuse.
The installation shall be such that, for any foreseeable deviation involving fire and explosion hazards, it shall
be possible to define a safe action towards prevention of escalation.
Where an explosive mixture could persist within a fuelling station enclosure after an accidental release of
hydrogen despite existing means of detection, isolation and ventilation, explosion relief shall be provided to
reduce the consequences of an explosion.
5 Hydrogen delivery systems
5.1 General
5.1.1 Access to the hydrogen delivery and storage areas
The installation shall be so designed that authorized personnel shall have easy access to and exit from the
operating area of the installation at all times.
The hydrogen delivery and storage area shall be located so that it is readily accessible to mobile supply
equipment at ground level and to authorized personnel. Suitable roadways or other means of access for
emergency equipment, such as fire department apparatus, shall be provided.
Where fencing is provided to prevent access of unauthorized persons, the minimum clearance between the
fence and the installation shall be 0,8 m to allow free access to and escape from the enclosure.
Adequate means of escape in the case of emergency shall be provided. In cases where authorized personnel
can be trapped inside compounds, there shall be at least two separate outward opening exits, remote from
each other, strategically placed in relation to the degree of hazard considered.
All gates shall be outward opening and wide enough to provide for the easy access and exit of authorized
personnel. Gates shall not allow entry without a key during normal operation.
Consideration shall be given to the provision of an additional emergency exit where the size of the fenced
area or equipment location necessitates this.
Access to the installation shall be prevented to all unauthorized persons. Warning notices shall support this.
Timber or other readily combustible materials shall not be used for fencing. The height of the fencing should
be at least 2 m.
5.1.2 Electrical grounding
All delivery vehicles shall be electrically connected to the ground prior to flexible hose connection.
The effectiveness of the grounding connection shall be checked at least once every three years.
5.2 Gaseous hydrogen supply by tube trailers and multi cylinder packs
5.2.1 Tube trailers
Hydrogen tube trailers shall be stationed in an area that is accessible to hydrogen distribution tractors and fire-
fighting services at all times.
Safety distances shall comply with those given in 13.2.2 for gaseous hydrogen systems.
Minimum clearance of 1 m shall be maintained on all sides of each tube trailer.
8 © ISO 2008 – All rights reserved
The tube trailer stationing area shall be level and horizontal. The front and rear ends of the tube trailer bays
shall be kept open. A bump stop shall indicate normal tube trailer position.
The location of the pressure reducing station shall be accessible.
Hydrogen tube trailers shall not be stationed outside of the designated trailer unloading bays.
A designated temporary tube trailer parking location shall be provided for carrying out tube trailer exchange
without interfering with fuelling operations, unless the fuelling activity is fully suspended during the tube trailer
exchange operation.
These temporary tube trailer parking locations shall not be located near buildings where persons are present
or near any potentially hazardous processes, sources of fuel, flammable gases or liquids.
5.2.2 Multi cylinder pack
Multi cylinder pack trailers shall be electrically connected to ground prior to flexible hose connection.
The storage area shall be fenced to prevent access of unauthorized persons. Activities other than those
directly related to the hydrogen tube trailer operation shall not be permitted in the vicinity of the trailers.
5.3 Liquid hydrogen supply
5.3.1 Liquid hydrogen storage layout and design features
To minimize the consequence of an accidental leakage, liquid hydrogen storage tanks should not be
enveloped or constricted by walls or buildings. Liquid hydrogen (storage tanks in 2- or 3-sided zone) should
also be avoided as much as possible to prevent accidental gas confinement if leakage occurs.
Safety distances shall comply with those given in 13.2.1 for liquid hydrogen systems.
For access and inspection, a minimum clearance of 1 m shall be maintained on all sides of each storage tank.
Any firebreak walls or partitions shall be made of brick, concrete or any other suitable non-combustible
material of 90 min rating.
The liquid hydrogen storage tanks shall be protected against vehicular impact by barriers or bollards.
Filling connections and equipment controls shall be accessible.
Connections and equipment controls necessary for filling purposes shall be located in close proximity to each
other and in such a way that the storage tank and tanker controls are visible and accessible from the
operator's position.
Dykes, diversion kerbs or grading shall be used to ensure that liquid leakage from adjacent combustible liquid
or liquid oxygen storages installed at a higher level than the liquid hydrogen storage is prevented from
accumulating within 15 m of the liquid hydrogen storage.
The liquid hydrogen storage tanks shall comply with ISO 21009-1.
5.3.2 Liquid hydrogen transfer area
The liquid hydrogen transfer area shall be designated a “NO PARKING” area.
The tanker, when in position for discharging to the installation, shall be in the open and not be in a walled
enclosure from which the escape of liquid or cold vapour is restricted. Tankers shall have easy access to, and
exit from, the installation at all times.
A concrete hard standing area shall be located adjacent to the fill coupling of the liquid hydrogen storage tank.
The fill coupling shall be located within the area of the liquid hydrogen storage tank plinth.
The liquid hydrogen transfer area shall be clearly defined, and transfer of liquid shall only take place within the
fuelling station premises.
5.3.3 Tank foundation and supports
Where liquid hydrogen storage tanks are required to be elevated, the tank supports shall be non-combustible
structures capable of withstanding damage by cryogenic liquid spillage.
The tank foundation shall be designed to withstand the weight of the liquid hydrogen storage tank, its contents
and other possible loads applied by wind, snow, etc.
The plinth on which the liquid hydrogen storage tank is installed shall be made of concrete or any other
suitable non-combustible material.
5.3.4 Liquid hydrogen delivery lines
Flexible hoses used for liquid hydrogen delivery shall comply with ISO 21012.
Liquid hydrogen delivery lines shall include a non-return valve or an emergency isolating device preventing
outflow in case of hose rupture.
5.3.5 Pressure relief devices
Pressure relief devices shall be provided to prevent over-pressure, including situations where liquid can be
trapped.
Pressure relief devices and vent piping shall be designed or located so that moisture cannot collect and freeze
in a manner which would interfere with proper operation of the pressure relief device.
A secondary pressure relief device shall be installed together with the primary pressure relief device of the
liquid hydrogen storage tank.
Safety valves shall comply with ISO 21013-1. Bursting disks shall comply with ISO 21013-2. Sizing and
capacity determination of safety valves and bursting disks shall meet the requirements of ISO 21013-3.
If a three-way valve is installed to accommodate two pressure relief devices operating either simultaneously or
alternatively, the size of the three-way valve, regardless of the position of the actuating device, shall be such
that the liquid hydrogen storage tank is adequately protected.
The three-way valve shall be provided with a position indicator, if appropriate, showing which pressure relief
devices are “on line”.
Consideration shall also be given in the design of the installation to facilitate the periodic testing of the
pressure relief devices.
Bursting disk material shall be compatible with hydrogen. Bursting disks shall be replaced every five years.
5.3.6 Cold hydrogen vents
All vents, including those of pressure relief devices and purge valves, shall be connected to a vent stack.
The vent stack shall be arranged to discharge in a safe place in the open air so as to prevent impingement of
escaping gas onto personnel or any structure. The vent stack shall not discharge where accumulation of
hydrogen can occur, such as below the eaves of buildings. Consideration shall be given to the prevention of
accumulation of water, including that from condensation, in the vent stack outlet.
10 © ISO 2008 – All rights reserved
The position of the vent stacks shall be taken into account in the siting of the installation and reflected in the
areas-classification drawing.
The vent stacks shall be dedicated to the liquid hydrogen installation and not be connected to other vent
stacks to avoid any back feed into the hydrogen vent stacks.
The outlet of the vent stacks shall not be equipped with devices that disturb the natural buoyancy of hydrogen.
5.3.7 Piping, fittings, valves, regulator for cryogenic service
Means shall be provided to minimize exposure of personnel to piping operating at low temperatures and to
prevent air condensate from contacting piping, structural members and surfaces not suitable for cryogenic
temperatures.
Uninsulated piping and equipment which operates at below air condensation temperature shall not be installed
above asphalt surfaces or other combustible materials in order to prevent contact of liquid air with such
materials. For the purposes of this Technical Specification, asphalt and bitumastic paving shall be considered
combustible. If expansion joints are used, fillers shall also be made of non-combustible materials. Drip pans
may be installed under uninsulated piping and equipment to retain and vaporize condensed liquid air.
Valves used for cryogenic service is shall comply with ISO 21011.
5.3.8 Cryogenic pumps
Foundations and sumps for cryogenic pumps shall be designed and constructed to prevent frost heaving.
Surfaces located under the pump’s connections and under uninsulated hydrogen piping shall be constructed
of non-combustible materials as specified in 5.3.7.
The following markings shall be clearly displayed and visible at all times near the cryogenic pump:
⎯ LIQUID HYDROGEN;
⎯ FLAMMABLE LIQUID;
⎯ NO SMOKING;
⎯ NO SOURCES OF IGNITION;
⎯ AUTHORIZED PERSONS ONLY;
⎯ Product identification.
Each cryogenic pump shall be provided with a vent and a pressure relief valve that will prevent over-
pressurizing of the pump case under all conditions including the maximum possible rate of cool-down.
5.3.9 Vaporizer
The vaporizer and its piping shall be pr
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