GB/T 42536-2023 PDF English
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| GB/T 42536-2023 | English | 440 |
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GB/T 42536-2023: Assembly valve on high pressure hydrogen storage cylinder for vehicles---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/GBT42536-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Assembly valve on high pressure hydrogen storge cylinder
for vehicles
Issued on. MAY 23, 2023
Implemented on. JUNE 01, 2024
Issued by. State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms, definitions, symbols... 6
4 Basic types... 6
5 Technical requirements... 7
6 Test methods and eligibility indicators... 9
7 Inspection rules... 26
8 Sign, packaging, transportation and storage... 29
9 Product certificate and batch inspection quality certificate... 30
Appendix A (Normative) Calculation method of thread shear stress safety factor... 32
Appendix B (Normative) Performance test method and qualification indicators of seals
for assembly valves... 36
Appendix C (Normative) Air tightness test method (vacuum chamber method)... 39
1 Scope
This document specifies the basic type, technical requirements, test methods, eligibility
indicators, inspection rules, marking, packaging, transportation, storage and other
requirements of the assembly valve on high-pressure hydrogen storage cylinders for
vehicles (hereinafter referred to as assembly valve).
This document is applicable to assembly valve on high-pressure hydrogen storage
cylinders for vehicles, which have a nominal working pressure not greater than 70 MPa
and a working temperature of -40 °C ~ 85 °C, are fixed on road vehicles AND used as
fuel tanks.
The type test of the temperature-driven safety pressure relief device for high-pressure
hydrogen storage cylinders, as used in vehicles, can be carried out with reference to this
document.
2 Normative references
The contents of the following documents constitute the essential provisions of this
document through normative references in the text. Among them, for dated references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) applies to this document.
GB/T 192 General purpose metric screw threads - Basic profile
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 223 (all parts) Methods for chemical analysis of iron, steel and alloy
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-
strain properties
GB/T 1220 Stainless steel bars
GB/T 2941 Rubber - General procedures for preparing and conditioning test pieces
for physical test methods
GB/T 3191 Extrusion rods and bars of aluminum and aluminum alloys
GB/T 3452.2 Fluid power systems - O-rings - Part 2.Quality acceptance criteria
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat
resistance tests
3 Terms, definitions, symbols
3.1 Terms and definitions
The terms and definitions, which are defined in GB/T 13005, as well as the following
terms and definitions, apply to this document.
3.1.1 Assembly valve on high pressure hydrogen storage cylinder for vehicles
A valve, which is installed on the high-pressure hydrogen storage cylinder for
vehicles, and consists of manual shut-off valve, automatic shut-off valve, check
valve, temperature-driven safety pressure relief device (TPRD), temperature sensor.
3.2 Symbols
The following symbols apply to this document.
4 Basic types
4.1 The assembly valve shall include manual shut-off valve, automatic shut-off valve,
check valve, TPRD, temperature sensor.
4.2 The assembly valve's model mark consists of the following parts.
Example. The model of the assembly valve on the high-pressure hydrogen storage cylinder for
Design serial number
Rated voltage, V
5 Technical requirements
5.1 Materials
5.1.1 Metal materials
5.1.1.1 The main parts and materials of assembly valves (valve body, valve stem, other
pressure parts) shall have the original quality certificate, which is provided by the
material manufacturer, OR a copy of the quality certificate, which was stamped with
the official seal of the material management organization and signed/sealed by the
person in charge.
5.1.1.2 The main parts and components of assembly valves shall have good
compatibility with hydrogen AND meet the requirements of corresponding material
standards.
5.1.2 Non-metallic seal materials
5.1.2.1 The non-metallic seal material shall have the original quality certificate, which
is provided by the material manufacturer, OR a copy of the quality certificate, which
has the official seal of the material management organization and the signature (seal)
of the person in charge. The quality certificate shall include the hardness, tensile
strength, elongation at break, etc. of the non-metallic seal material.
5.1.2.2 Non-metallic seals shall be made of materials, which have good compatibility
with high-pressure hydrogen. The properties of the seal materials shall meet the
requirements in 6.7.
5.2 Design and manufacture
5.2.1 For the assembly valves on high-pressure hydrogen storage cylinders for vehicles,
that cannot be disassembled due to structural design of the vehicle body, they shall have
a designed service life of not less than 15 years. For the assembly valves on high-
pressure hydrogen storage cylinders for other vehicles, they shall have a designed
service life of not less than 6 years.
5.2.2 Assembly valves shall have the following functions.
5.2.3 Assembly valve body shall be subject to the finite element stress analysis. Under
2.5 times the nominal working pressure, the stress of each part of the valve body shall
not be greater than the guaranteed value of the yield strength of the valve body material.
5.2.4 The gas inlet and outlet thread specifications of assembly valves shall be straight
threads, in accordance with GB/T 192, GB/T 196, GB/T 197 or GB/T 20668, OR other
threads in accordance with the corresponding standards.
5.2.5 The thread of assembly valve shall be checked for strength; the shear stress safety
factor of the thread, at 1.5 times the nominal working pressure, shall not be less than 4.
The calculation method of thread shear stress safety factor shall be carried out, in
accordance with Appendix A.
5.2.6 Fusible alloy or glass bubble shall be selected as the safety pressure relief device;
the operating temperature is (110 ± 5) °C.
5.2.7 The valve body should be formed by forging and pressing; there shall be no
defects such as cracks, wrinkles, inclusions, looseness, shrinkage cavities.
5.2.8 The O-ring shall be tested, according to the provisions of B.3 in Appendix B
before selection.
6 Test methods and eligibility indicators
6.1 Metal material test of main components
6.1.1 Mechanical property test
6.1.1.1 Test method
Tensile specimens and test methods for main parts and materials shall be implemented,
in accordance with GB/T 228.1.The impact specimens and test methods shall be
implemented, in accordance with GB/T 229 (except for aluminum alloy materials).
6.1.1.2 Eligibility indicators
The test results shall meet the requirements of material standards and design.
6.1.2 Chemical composition analysis
6.1.3 Hydrogen compatibility test
6.1.4 Hydrogen embrittlement susceptibility test
6.1.4.1 Test method
The hydrogen embrittlement susceptibility test shall be carried out, in accordance with
GB/T 34542.3.
6.1.4.2 Eligibility indicators
The test results shall meet the requirements of material standards and design.
6.2 Visual inspection
6.2.1 Test method
The appearance of the valve body is inspected visually.
6.2.2 Eligibility indicators
Check whether the results meet the following requirements.
6.3 Thread inspection
6.3.1 Test method
Use gauges, that comply with GB/T 3934 or corresponding standards, to make
inspection.
6.3.2 Eligibility indicators
The inspection results shall meet the following requirements.
6.4 Air tightness test
6.4.1 Test method
In accordance with the provisions of Appendix C, the air tightness test shall be carried
out, under normal temperature conditions at (2 ± 0.5) MPa and a pressure not lower
than 1.25p, respectively. The test medium shall be pure helium. According to the
structure of the assembly valve, the internal leakage and external leakage tests are
carried out, respectively.
6.4.2 Eligibility indicators
Helium leak rate shall not exceed 7.5 mL/h.
6.5 TPRD test
6.5.1 Hydrogen cycle test
6.5.2 Accelerated life test
6.5.2.1 Test method
The test procedure is as follows.
6.5.3 Temperature cycle test
6.5.3.1 Test method
The test steps are as follows.
6.5.3.2 Eligibility indicators
After the temperature cycle test, the TPRD shall comply with the provisions of 6.5.9
leak test, 6.5.10 action test, 6.5.11 flow test. The temperature of the leak test shall not
be higher than -40 °C.
6.5.4 Salt spray corrosion resistance test
6.5.4.1 Test method
The test requirements are as follows.
6.5.5 Condensation corrosion resistance test
6.5.5.1 Test method
The test procedure is as follows.
7 Inspection rules
7.1 Material inspection
7.1.1 The metal raw materials shall be subject to mechanical property retest based on
batch, AND chemical composition retest based on furnace number, which shall comply
with the provisions of 6.1.1 and 6.1.2.
7.1.2 O-rings shall be visually inspected one by one; they shall meet the requirements
of B.3.1.Other non-metallic seals shall be visually inspected one by one; the appearance
shall be intact and free of defects.
7.1.3 O-rings shall be subject to size inspection and oxygen aging resistance test based
on batch size; it shall meet the requirements of B.3.2 and 6.7.1.
7.2 Exit-factory inspection
7.2.1 Inspection one by one
Assembly valves shall be inspected one by one, before leaving the factory. The
inspection items shall be in accordance with the provisions in Table 2.During the
inspection process, if there is an unqualified item, the valve is unqualified.
7.3 Type test
7.3.1 If the assembly valve has one of the following conditions, the type test shall be
carried out by the inspection agency, that has obtained the corresponding valve type test
qualification.
7.3.2 Assembly valves for type test shall be selected, from the products that have passed
the exit-factory inspection. See Table 3 for the test items. See Figure 3 and Figure 4, for
the test sequence and number of test pieces for the type test. All items of the type test
shall meet the requirements of this document. If there is any test result of a valve, that
does not meet the requirements of this document, it will be determined that the type test
of the valve fails. If it is caused by design reasons, the manufacturer shall change the
design; carry out trial production according to the changed design; re-take samples for
type tests of all items. If it is caused by improper process or manufacturing control, the
manufacturer shall submit a written descriptions on solving the problem, to the type test
agency.
8 Sign, packaging, transportation and storage
8.1 Sign
The assembly valve shall have the following permanent and clear signs.
8.2 Packaging, transportation, storage
8.2.1 The moisture remaining in the valve shall be removed before packaging. During
packaging, the valve shall be kept clean, free from oil and corrosion. The air inlet and
outlet threads shall not be damaged.
8.2.2 The product qualification certificate and instruction manual should be attached
inside the packing box.
9 Product certificate and batch inspection quality certificate
9.1 Product certificate
The exit-factory product certificate shall at least include the following contents.
9.2 Batch inspection quality certificate
9.2.1 Products, which are exit-factory in batches, shall have a batch inspection quality
certificate.
9.2.2 The content of the product batch inspection quality certificate shall include the
exit-factory inspection items, product batch number, product quantity, which are
specified in this document.
9.2.3 The issuance of the product batch inspection quality certificate shall be signed
(sealed) by the product quality inspection responsible person or quality assurance
engineer, which is authorized by the top management of the manufacturer.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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