ISO 14469-2:2007
(Main)Road vehicles — Compressed natural gas (CNG) refuelling connector — Part 2: 20 MPa (200 bar) connector, size 2
Road vehicles — Compressed natural gas (CNG) refuelling connector — Part 2: 20 MPa (200 bar) connector, size 2
ISO 14469-2:2007 applies to compressed natural gas (CNG) vehicle nozzles and receptacles, constructed entirely of new, unused parts and materials for which there is a demand, in particular for large CNG urban buses of refuelling times equivalent to those of urban buses driven by conventional diesel engines. The proposed connector, size 2, offers a larger cross section than the connector in accordance with ISO 14469-1 and, therefore, permits refuelling of the vehicles within significantly shorter time periods. Studies have shown that the proposed connector, size 2, offers more than twice the mass flow of the connectors specified in ISO 14469-1. CNG fuelling connection nozzles consist of the following components, as applicable: receptacle and protective cap (mounted on vehicle); nozzle. ISO 14469-2:2007 applies only to devices which have a service pressure of 20 MPa. ISO 14469-2:2007 applies to devices with standardized mating components. ISO 14469-2:2007 applies to connectors which prevent natural gas vehicles from being fuelled by dispenser stations with service pressures higher than the vehicle, and allow natural gas vehicles to be fuelled by dispenser stations with service pressures equal to or lower than the vehicle fuel system service pressure. ISO 14469-2:2007 is applicable to compressed natural gas in accordance with ISO 15403.
Véhicules routiers — Connecteur de remplissage en gaz naturel comprimé (GNC) — Partie 2: Connecteur 20 MPa (200 bar), taille 2
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 14469-2
First edition
2007-12-15
Road vehicles — Compressed natural
gas (CNG) refuelling connector —
Part 2:
20 MPa (200 bar) connector, size 2
Véhicules routiers — Connecteur de remplissage en gaz naturel
comprimé (GNC) —
Partie 2: Connecteur 20 MPa (200 bar), taille 2
Reference number
ISO 14469-2:2007(E)
©
ISO 2007
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ISO 14469-2:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 14469-2:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 General construction requirements.2
5 Nozzles.3
6 Standard receptacle dimensions .4
7 Receptacles .4
8 Instructions .6
9 Marking .6
10 Tests.7
10.1 General requirements.7
10.2 User interface.7
10.3 Impact resistance.8
10.4 Receptacle protective caps .8
10.5 Leakage at room temperature .8
10.6 Valve operating handle .9
10.7 Abnormal loads.9
10.8 Rocking/twisting .10
10.9 Mounting hardware torque .11
10.10 Low and high temperatures.11
10.11 Durability .12
10.12 Hydrostatic strength.15
10.13 Corrosion resistance.15
10.14 Deformation.15
10.15 Non-igniting evaluation.16
10.16 Pressure-tight protective cap (PTPC).16
Annex A (informative) Nozzle characteristics .20
Annex B (informative) Manufacturing and production test plan .21
Annex C (normative) Receptacle test fixture .22
Bibliography .24
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ISO 14469-2:2007(E)
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.
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 14469-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 25,
Vehicles using gaseous fuels.
ISO 14469 consists of the following parts, under the general title Road vehicles — Compressed natural gas
(CNG) refuelling connector:
⎯ Part 1: 20 MPa (200 bar) connector
⎯ Part 2: 20 MPa (200 bar) connector, size 2
⎯ Part 3: 25 MPa (250 bar) connector
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ISO 14469-2:2007(E)
Introduction
This part of ISO 14469 was developed for use in the examination, testing and certification of newly produced
compressed natural gas (CNG) vehicle fuelling nozzles and receptacles. As such, it applies only to the
nozzles and receptacles used in CNG fuelling systems, and not to the system itself.
A nozzle certified to this part of ISO 14469 will be functionally compatible from a safety and performance
perspective with all listed receptacles of compatible profile and system pressure. Similarly, a certified
receptacle will be functionally compatible from a safety and performance perspective with all listed nozzles of
compatible profile and system pressure.
As there may eventually be many different kinds of nozzles and receptacles available from a variety of
manufacturers which, for safety reasons, all need to be compatible with one another, this part of ISO 14469
specifies a series of receptacle profiles. These standard profiles incorporate the design specifications (mating
materials, geometry and tolerances) that may be considered in the certification of a submitted nozzle or
receptacle. This part of ISO 14469 refers only to one working pressure and one application. Other working
pressures and applications are under consideration for the future.
The construction and performance of nozzles and receptacles are based on the observation that three main
parameters listed below affect user safety and system compatibility.
1)
a) Working pressure: all nozzles and receptacles are designed to have a working pressure of 25 MPa .
b) Design life: since frequency of use will differ with the nozzle/receptacle application (i.e. public sector, fleet
employment and residential), all receptacles will be tested at 10 000 connect/disconnect cycles for
compliance with this part of ISO 14469. In addition, all nozzles will be tested according to the following
frequency use classifications, as applicable:
1) class A nozzle, specifying high frequency use, with a cycle life of 100 000 and equating to
approximately 100 fills per day for three years;
2) class B nozzle, specifying medium frequency use, with a cycle life of 20 000 and equating to
approximately 10 fills per day for five years.
c) Training: operator training required is in accordance with national requirements.
1) 1 MPa = 10 bar.
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INTERNATIONAL STANDARD ISO 14469-2:2007(E)
Road vehicles — Compressed natural gas (CNG) refuelling
connector —
Part 2:
20 MPa (200 bar) connector, size 2
1 Scope
This part of ISO 14469 applies to compressed natural gas (CNG) vehicle nozzles and receptacles,
constructed entirely of new, unused parts and materials for which there is a demand, in particular for large
CNG urban buses of refuelling times equivalent to those of urban buses driven by conventional diesel
engines. The proposed connector, size 2, offers a larger cross section than the connector in accordance with
ISO 14469-1 and, therefore, permits refuelling of the vehicles within significantly shorter time periods. Studies
have shown that the proposed connector, size 2, offers more than twice the mass flow of the connectors
specified in ISO 14469-1. CNG fuelling connection nozzles consist of the following components, as applicable:
⎯ receptacle and protective cap (mounted on vehicle) (see Clause 7);
⎯ nozzle (see Clause 5).
This part of ISO 14469 applies only to devices which have a service pressure of 20 MPa [referred to as C200
receptacle, see 9.2 c)].
This part of ISO 14469 applies to devices with standardized mating components (see 5.8 and 7.7).
This part of ISO 14469 applies to connectors that
⎯ prevent natural gas vehicles from being fuelled by dispenser stations with service pressures higher than
the vehicle, and
⎯ allow natural gas vehicles to be fuelled by dispenser stations with service pressures equal to or lower
than the vehicle fuel system service pressure.
This part of ISO 14469 is applicable to compressed natural gas in accordance with ISO 15403.
All references to pressures throughout this part of ISO 14469 are considered to be gauge pressures unless
otherwise specified. The selection of the appropriate standardized connector is agreed between the vehicle
manufacturer and the customer.
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 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
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ISO 14469-2:2007(E)
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 15501-1, Road vehicles — Compressed natural gas (CNG) fuel systems — Part 1: Safety requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
dry air
air with moisture content such that the dew point of the air at the required test pressure is at least 11 °C below
the ambient test temperature
3.2
hydrostatic pressure
pressure to which a component is taken to verify the structural strength of the component
3.3
working pressure
maximum pressure that a CNG refuelling connector can be expected to withstand in actual service
3.4
service pressure
settled pressure of 20 MPa at a uniform gas temperature of 15 °C
3.5
positive locking means
feature which requires actuation of an interlocking mechanism to allow connection/disconnection of the nozzle
from the receptacle
3.6
CNG refuelling nozzle
CNG nozzle
device which permits quick connection and disconnection of fuel supply hose to the CNG receptacle in a safe
manner
3.7
CNG refuelling receptacle
receptacle
device connected to a vehicle or storage system which receives the CNG refuelling nozzle and permits safe
transfer of fuel
3.8
CNG refuelling connector
connector
joined assembly of CNG refuelling nozzle and receptacle
4 General construction requirements
4.1 CNG nozzles and receptacles manufactured in accordance with this part of ISO 14469 shall be
designed in accordance with reasonable concepts of safety, durability and maintainability.
NOTE Nozzles and receptacles are both referred to as devices in this part of ISO 14469.
4.2 CNG nozzles and receptacles shall be well fitted and manufactured in accordance with good
engineering practice. All construction requirements may be met by either the construction specified in this part
of ISO 14469 or another construction that gives at least equivalent performance.
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ISO 14469-2:2007(E)
4.3 CNG nozzles and receptacles shall be
⎯ designed to minimize the possibility of incorrect assembly,
⎯ designed to be secure against displacement, distortion, warping or other damage, and
⎯ constructed to maintain operational integrity under normal and reasonable conditions of handling and
usage.
4.4 CNG nozzles and receptacles shall be manufactured of materials suitable and compatible for use with
compressed natural gas at the pressure and the temperature ranges to which they will be subjected.
The minimum temperature range shall be selected by the manufacturer between the following ranges:
⎯ −40 °C to 85 °C;
⎯ −20 °C to 120 °C.
4.5 CNG nozzles and receptacles constructed of brass shall use brass alloys with a copper mass content
u 70 %. This ensures proper material compatibility with all the constituents of natural gas.
4.6 Separate external three-way valves shall be constructed and marked so as to indicate clearly the open,
shut and vent positions.
4.7 CNG nozzles and receptacles shall be operated either to connect or disconnect without the use of tools.
4.8 The receptacle shall be mounted on the vehicle in compliance with ISO 15501-1.
4.9 Jointing components shall provide gas-tight sealing performance.
4.10 For quick fuelling, the cross-sections of all piping and fittings on both the vehicle and the filling station
shall be optimized in order to make optimum use of the larger coupling specified in this part of ISO 14469.
5 Nozzles
5.1 Nozzles shall be in accordance with one of the two types listed below (see also Annex A).
a) Type 1 nozzle, for use with dispensing hoses that remain fully pressurized at dispenser shut-down: the
nozzle shall not allow gas to flow until a positive connection has been achieved. The nozzle shall be
equipped with an integral valve or valves, incorporating an operating mechanism which first stops the
supply of gas and safely vents the trapped gas before allowing the disconnection of the nozzle from the
receptacle. The operating mechanism shall ensure the vent valve is in the open position before the
release mechanism can be operated, and the gas located between the nozzle shut-off valve and the
receptacle check valve is safely vented prior to nozzle disconnection (see 10.2).
b) Type 2 nozzle, for use with dispensing hoses that remain fully pressurized at dispenser shut-down: a
separate three-way valve connected directly, or indirectly, to the inlet of the nozzle is required to safely
vent trapped gas prior to nozzle disconnection. The nozzle shall not allow gas to flow until a positive
connection has been achieved. The operator shall not be able to operate the three-way valve if the
positive lock of the nozzle is not achieved. Venting is required prior to disconnection of the nozzle (see
10.2).
In addition, nozzles shall be classified in terms of cycle life as follows:
⎯ class A, specifying high frequency use, with a cycle life of 100 000;
⎯ class B, specifying low frequency use, with a cycle life of 20 000.
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ISO 14469-2:2007(E)
5.2 Venting or depressurization of all nozzle types is required prior to disconnection. It shall be possible to
disconnect all nozzles in accordance with 10.2.
5.3 The method for attaching the nozzle to the fuel dispensing system hose shall not rely on the joint
threads between the male and female threads for sealing (e.g. conical threads).
5.4 The three-way valve exhaust port of type 1 and type 2 nozzles shall be protected from the ingress of
foreign particles and fluid which would hamper the operation of the valve.
5.5 The portions of a nozzle that are held by the user for connection or disconnection may be thermally
insulated.
5.6 A type 1 nozzle shall bear a marking in accordance with Clause 9, indicating the direction of the open
and shut operation of the actuating mechanism, if necessary.
5.7 The interface surface of the nozzle shall be constructed of material having a hardness > 75 Rockwell B
(HRB 75) and shall be non-sparking and conductive (see 10.11.5 and 10.15).
The exposed surfaces of the nozzles shall be made of non-sparking materials (see 10.11.5 and 10.15).
5.8 Nozzles shall comply with the performance requirements of Clause 10 to ensure interchangeability.
6 Standard receptacle dimensions
A receptacle shall comply with the design specifications detailed in Figure 1.
7 Receptacles
7.1 Receptacles shall comply with this part of ISO 14469 and shall be evaluated using at least two different
test nozzles, each nozzle representing a different locking technology.
The failure of any test conducted with the receptacle and nozzle test samples shall constitute a failure of the
submitted receptacle, unless the manufacturer can prove the problem was caused by the test nozzle.
7.2 Receptacle designs that employ means on the back diameter as specified in Figure 1 to accommodate
mounting, or for mounting accessories or marking purposes, shall not have such means extend beyond the
back diameter dimensions of the profile as specified in Figure 1, as applicable. Acceptable means include
wrench flats, dust cap anchoring grooves, use of hex stock, undercutting for marking, and threads for
pressure-tight caps. Receptacle designs shall not compromise the interchangeability requirements specified in
Annex C.
7.3 The receptacle shall be equipped with an internal check valve to prevent the escape of gas. The check
valve shall be of the non-contact type, opening by differential pressure only.
7.4 The method for attaching the receptacle to the vehicle fuel system shall not rely on the joint between
the male and female threads for sealing, such as conical threads.
7.5 The interfacing surface of the receptacle shall be constructed of material having a hardness > 75
Rockwell B (HRB 75) and shall be non-sparking and conductive (see 10.11.5 and 10.15).
The exposed surfaces of devices shall be made of non-sparking materials (see 10.11.5).
7.6 Receptacles shall have a means to prevent the ingress of fluids and foreign matter.
7.7 The function described in 7.6 may also be met by either a protective cap (see 10.4) or a pressure-tight
protective cap (see 10.16).
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ISO 14469-2:2007(E)
7.8 The receptacle shall have provisions to be firmly attached to the vehicle and shall comply with
applicable abnormal load tests (see 10.7).
7.9 The receptacle shall not be installed in an area in which the temperature exceeds 85 °C.
7.10 Receptacles shall have a cycle life of > 10 000.
Dimensions in millimetres
Key
1 sealing ID = ∅15,47 ± 0,1 width = ∅3,53 ± 0,2
a
This area shall be kept free of all components
Surface roughness < Ra 3,2 µm.
Sealing surface finish: 0,8 µm to 0,05 µm.
Material hardness: 75 Rockwell B (HRB 75) minimum.
Figure 1 — C200 receptacle
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ISO 14469-2:2007(E)
8 Instructions
The information required by this clause for instructions and specified provisions shall be in a form that is easily
understood.
Special tools required for the connection of receptacles to tubing and for the assembly and disassembly of
three-way valve parts shall be clearly identified in the instructions.
Manufacturers of receptacles, nozzles and three-way valves shall provide clear and concise printed
instructions and diagrams in a form that can be easily understood, and that is adequate for
a) proper field assembly,
b) installation,
c) maintenance,
d) replacement of components, as appropriate,
e) safe operation by all users,
f) suitability and use, and
g) storage and handling.
9 Marking
9.1 The information required by this clause for instructions and specified provisions shall be in a form that is
easily understood. Marking should be embossed, cast, stamped or otherwise formed in the part. This includes
markings baked into an enamelled surface.
9.2 Nozzles and receptacles shall bear the following information:
a) manufacturer's or dealer's name, trademark or symbol;
b) model designation;
c) C200;
d) applicable type and class (see 5.1).
9.3 Nozzles and receptacles shall each bear a date code marking.
The four-digit date code marking shall consist of at least four adjacent digits, determined as indicated below.
a) The first and second digits shall indicate the calendar year in which the nozzle, receptacle or three-way
valve was manufactured (e.g. “96” for 1996 and “00” for 2000).
b) The third and fourth digits shall indicate the week in which the nozzle, receptacle or three-way valve was
manufactured (e.g. “03” for the third week of the year). For the purpose of this marking, a week shall
begin at 00:01 on Sunday and end at 24:00 on Saturday.
A date code may be used for more than one week; however, it shall not be used for more than four
consecutive weeks, or for more than two weeks into the next calendar year.
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ISO 14469-2:2007(E)
When a four-digit date code is not practical, the manufacturer shall submit a plan acceptable to the certifying
agency which will outline means of establishing the date of manufacture such that it is traceable to the
purchaser.
NOTE Annex B gives an example of a manufacturing and production test plan.
Additional numbers, letters or symbols may follow the four-digit number specified in a) and b). If additional
numbers are used, they shall be separated from the date code.
9.4 Marking to identify this part of ISO 14469 shall be provided for each system. This marking may be
located on the package, or on a notice placed inside the package in which the device is shipped.
10 Tests
10.1 General requirements
A nozzle and receptacle shall be tested with the receptacle and nozzle designs specified in this part of
ISO 14469.
Unless otherwise stated,
a) tests shall be conducted at room temperature (20 ± 5) °C,
b) all pressure or leak tests shall be conducted with dry air or dry nitrogen, and
c) devices shall be conditioned to attain equilibrium conditions.
Type 2 nozzles shall be tested in series, with either a three-way valve or some other means to independently
pressurize and vent the nozzle. The three-way valve shall not affect temperature, durability or flow
characteristics of the nozzle. Failure of the three-way valve shall not constitute failure of the nozzle. A three-
way valve that is supplied for utilization with a type 2 nozzle shall be evaluated separately.
Nozzle tests are to be carried out, as applicable, with the test fixtures as specified in Annex C. A new
receptacle test sample shall be used for each nozzle test. The failure of any test conducted with the nozzle
and receptacle test sample shall constitute a failure of the nozzle design.
10.2 User interface
The appearance of the nozzle and receptacle shall be such as to clearly suggest the proper method of use.
It shall not be possible to deliver gas using type 1 nozzles unless the nozzle and receptacle are connected
properly and positively locked.
Upon disconnection, type 1, 2 and 3 nozzles shall stop the flow of gas. No hazardous condition shall result
from disconnection. Type 3 nozzles shall be at 0,7 MPa during this test.
When the contained pressure is less than or equal to 0,7 MPa, it shall be possible to disconnect all nozzles
with forces or torque not exceeding 225 N or 7 Nm.
The disconnection force/torque shall be applied in a direction that tends to unhook and release the nozzle.
The force/torque shall be applied to the unhooking/release actuator. The torque shall be applied through axis
rotation of the nozzle handle equal to the exterior handling surface of the nozzle uncoupling mechanism and in
a direction such that the nozzle tends to unhook and be released.
On depressurized devices, the axial force to connect and lock or unlock and disconnect the device shall be
u 90 N.
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ISO 14469-2:2007(E)
On a positive locking device that incorporates a rotary locking means, the torque to lock or unlock the locking
means shall not exceed 1 Nm for a device having a diameter u 25,4 mm, and 1,7 Nm for a device having a
diameter > 25,4 mm.
The minimum force to facilitate disconnection at pressures of 6,25 MPa or more shall be 2,5 times the force
when depressurized (types 1 and 2) or 0,7 MPa (type 3). Type 1 nozzles shall be tested with the vent port
plugged.
10.3 Impact resistance
A nozzle shall be connected to a 4,6 m length of 9,5 mm internal diameter (ID) refuelling hose, conditioned at
−40 °C for 24 h and then dropped 1,8 m onto a concrete floor, as shown in Figure 2. The nozzle shall be
dropped ten times, then pressurized to 20 MPa and subjected to ten additional drops. Following these drops,
the nozzle shall be capable of normal connection and disconnection to the receptacle. In addition, the nozzle
shall comply with all leakage tests specified in this part of ISO 14469 (see 10.5).
10.4 Receptacle protective caps
There shall be no permanent distortion or damage to any receptacle protective cap, when tested as follows.
A solid steel ball with a diameter 50 mm shall be dropped from a height of 300 mm striking the protective cap
installed on the receptacle. The test shall be conducted at −40 °C and at 85 °C at a minimum of five points of
impact most likely to cause damage to the receptacle and the protective cap.
Dimensions in metres
Key
1 suitable support
2 refuelling hose (9,5 mm diameter)
3 concrete floor
4 nozzle
Figure 2 — Impact resistance test arrangement
10.5 Leakage at room temperature
10.5.1 Nozzle
A nozzle, whether coupled or uncoupled, shall be either bubble-free on the leak test for 1 min, or have a leak
3
rate less than 20 cm /h (normalized), when tested as follows.
Tests shall be conducted at 0,5 MPa, 30 MPa and then 0,5
...
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