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Road vehicles - Compressed natural gas (CNG) fuel systems - Part 2: Test methods
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GB/T 44410.2-2024: Road vehicles - Compressed natural gas (CNG) fuel systems - Part 2: Test methods---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT44410.2-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
CCS T 40
Road vehicles - Compressed natural gas (CNG) fuel systems
- Part 2: Test methods
(ISO 15501-2:2016, MOD)
ISSUED ON: AUGUST 23, 2024
IMPLEMENTED ON: DECEMBER 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Test methods ... 6
Appendix A (Informative) Structure number comparison table ... 12
Appendix B (Informative) Engineering experience for the mounting of steel cylinders
... 14
Bibliography ... 17
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document is Part 2 of GB/T 44410 Road vehicles - Compressed natural gas (CNG)
fuel systems. The following parts have been issued for GB/T 44410:
-- Part 1: Safety requirements;
-- Part 2: Test methods.
This document adopts ISO 15501-2:2016, Road vehicles - Compressed natural gas
(CNG) fuel systems - Part 2: Test methods, by modification.
Compared with ISO 15501-2:2016, this document has a lot of adjustments in structure.
See Appendix A for a list of structure number changes between the two documents.
The technical differences between this document and ISO 15501-2:2016 and their
reasons are as follows:
-- Use the normatively referenced GB/T 44410.1-2024 to replace ISO 15501-1
(see Chapter 3, 4.3.2) to adapt to our country's technical conditions and
increase operability;
-- Delete the term “notified body” (see 3.1 of ISO 15501-2:2016) to adapt to our
country’s technical conditions;
-- Change the strength test and acceptance conditions of gas cylinders (see
4.1.1.1, 4.1.1.3, 4.1.1.4) to adapt to our country's technical conditions;
-- Delete the requirements for aftermarket rotatable parts (see 4.1.2 and 4.1.3 of
ISO 15501-2:2016) to adapt to our country's technical conditions;
-- Add dynamic test acceleration and equivalent calculation method for gas
cylinders of different types of vehicles (see 4.1.2.3, 4.1.2.4) to adapt to our
country's technical conditions;
-- Add gas density state in static test (see 4.1.3.2), with different gas density
values at different temperatures;
-- Use the normatively referenced GB/T 17258 to replace ISO 11439 (see 4.1.5.3)
to adapt to our country's technical conditions and increase operability.
This document also makes the following editorial modifications:
-- Add the informatively referenced GB/T 3730.1 (see Chapter 1);
Road vehicles - Compressed natural gas (CNG) fuel systems
- Part 2: Test methods
1 Scope
This document describes the test methods for compressed natural gas on-board fuel
systems that meet the safety requirements of GB/T 44410.1-2024.
This document applies to road vehicles using compressed natural gas on-board fuel
systems as specified in GB/T 3730.1.
Note: For the tests of individual components, refer to ISO 15500 (all parts), GB/T
43408, GB/T 17258 and GB/T 24160.
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
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 17258, Steel cylinders for the on-board storage of compressed natural gas as
a fuel for automotive vehicles (GB/T 17258-2022, ISO 11439:2013, NEQ)
GB/T 44410.1-2024, Road vehicles - Compressed natural gas (CNG) fuel systems
- Part 1: Safety requirements (ISO 15501-1:2016, MOD)
ISO 6487, Road vehicles - Measurement techniques in impact tests -
Instrumentation
ISO 15500-1, Road vehicles - Compressed natural gas (CNG) fuel system
components - Part 1: General requirements and definitions
3 Terms and definitions
For the purposes of this document, the following terms and definitions, as well as those
given in GB/T 44410.1-2024 and ISO 15500-1, apply.
4 Test methods
4.1 Cylinder mounting strength tests
ρ – density of CNG at 20 MPa and 15 °C, which is taken as 0.2 and is expressed in
kilograms per liter (kg/L).
4.1.3.3 The test shall be carried out using the following procedure:
a) Apply force in the direction specified in 4.1.2.2 to the gas cylinder group
anchorages within 0.2 s, and pass through the center of gravity of the gas
cylinder group to the set value;
b) Maintain the force for at least 0.2 s;
c) Remove the force.
4.1.4 Alternative method
If the vehicle collision test is carried out in accordance with the regulations, it is
considered to comply with the provisions of GB/T 44410.1-2024. A calculation method
can be used instead of practical testing if its equivalence can be demonstrated.
4.1.5 Gas cylinder acceptance criteria
4.1.5.1 Acceptance by testing
After the gas cylinder or gas cylinder group is tested according to the methods specified
in 4.1.2 and 4.1.3, the gas cylinder shall:
-- remain attached to the test piece;
-- structural damage to the bracket does not affect installation.
4.1.5.2 Acceptance by calculation
Appropriate calculations shall be performed based on various technical parameters. The
calculation method shall be approved by the testing agency.
4.1.5.3 Acceptance by engineering experience (steel cylinders)
The conformity acceptance of steel cylinders (in accordance with the provisions of
GB/T 17258) is determined by calculation results and confirmed by long-term
experience. See Appendix B.
4.2 Leakage test
4.2.1 The test can be carried out at ambient temperature. Each vehicle shall be subjected
to the following tests:
a) Fill the vehicle fueling system upstream of the first-stage pressure regulator with
gas at 1 MPa ± 0.1 MPa;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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