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GB/T 42626-2023 English PDF (GBT42626-2023)

GB/T 42626-2023 English PDF (GBT42626-2023)

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GB/T 42626-2023: Periodic inspection and evaluation of fully wrapped fibre reinforced composite gas cylinders of compressed hydrogen gas for automotive vehicles
GB/T 42626-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Periodic Inspection and Evaluation of Fully Wrapped Fiber
Reinforced Composite Gas Cylinders of Compressed
Hydrogen Gas for Automotive Vehicles
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Technical Requirements ... 8
4.1 Types and Descriptions of Gas Cylinder ... 8
4.2 Inspection Tools and Devices ... 8
4.3 Inspection Cycle ... 9
4.4 Inspection Items ... 9
5 Inspection Preparation ... 10
5.1 Pre-inspection of Hydrogen Storage System ... 10
5.2 Information Query and Recording ... 11
5.3 Depressurization and Nitrogen Replacement of Gas Cylinders ... 12
5.4 Disassembly and Surface Cleaning of Gas Cylinders and Cylinder Valves ... 12
6 Appearance Inspection and Evaluation ... 13
6.1 Types of Damage ... 13
6.2 Damage Level ... 13
6.3 Inspection and Evaluation of Appearance Damages ... 16
7 Treatment of Outer Surface Damage ... 18
8 Internal Inspection and Evaluation ... 19
8.1 Types of Damage ... 19
8.2 Damage Level ... 19
8.3 Internal Damage Inspection and Evaluation ... 19
9 Cylinder Neck Thread Inspection and Evaluation ... 19
10 Hydrostatic Test ... 20
11 Internal Drying ... 21
11.1 Method and Requirements for Drying ... 21
11.2 Inspection of Drying Condition ... 21
12 Inspection and Assembly of Cylinder Valve ... 21
13 Air-tightness Test ... 22
14 Post-inspection Work ... 23
Appendix A (informative) Depressurization of Gas Cylinders ... 25
Appendix B (informative) Illustrations of Typical Damages to Gas Cylinders ... 26
Appendix C (informative) Illustrations of Surface Damage Treatment Method of Gas
Cylinders ... 35
Appendix D (normative) Reset Installation Inspection of Gas Cylinders ... 39
Appendix E (informative) Periodic Inspection Report of Gas Cylinders ... 41
Bibliography ... 47
Periodic Inspection and Evaluation of Fully Wrapped Fiber
Reinforced Composite Gas Cylinders of Compressed
Hydrogen Gas for Automotive Vehicles
1 Scope
This document specifies the basic method and technical requirements for the periodic
inspection and evaluation of fully wrapped fiber reinforced composite gas cylinders of
compressed hydrogen gas for automotive vehicles (hereinafter referred to as “gas cylinders”).
This document is applicable to gas cylinders designed and manufactured in accordance with
GB/T 35544 and GB/T 42612, whose nominal working pressure does not exceed 70 MPa,
nominal water capacity is not greater than 450 L, and the storage medium is compressed
hydrogen gas, and operating temperature is not lower than 40 C and not higher than 85 C.
This document is not applicable to gas cylinders installed on passenger vehicles with a length
of not more than 8 m and a seating capacity of not more than 19, and cannot be disassembled
for periodic inspection.
The periodic inspection and evaluation of gas cylinders for hydrogen supply, such as: hydrogen
fuel cell urban rail transits, hydrogen energy ships sand hydrogen energy power generation
devices, etc. may take this document as a reference.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 3464.1 Machine and Hand Taps - Part 1: Plain Parallel Shank Machine and Hand Taps
GB/T 3836.1 Explosive Atmospheres - Part 1: Equipment - General Requirements
GB/T 3934 Specification of Gauges for General Purpose Screw Threads
GB/T 8979 Pure Nitrogen and High Purity Nitrogen and Ultra Pure Nitrogen
GB/T 9251 Methods for Hydrostatic Test of Gas Cylinders
GB/T 13005 Terminology of Gas Cylinders
Resin refers to a material used to bond fibers and transmit loads.
NOTE: it is usually thermoset.
3.8 stress corrosion cracking
Stress corrosion cracking refers to cracks or fractures of composite materials caused by a
combined action of load and harsh environments.
3.9 thermally-activated pressure relief device (TPRD) end plug
Thermally-activated pressure relief device (TPRD) end plug refers to an end plug installed at
one end of the double-port structure gas cylinder, and equipped with a thermally-activated
pressure relief device (TPRD) and the function of blind plugging.
3.10 rejection elastic expansion; REE
Rejection elastic expansion refers to the allowable upper limit of elastic expansion of gas
cylinder specified by the manufacturing organization in the design and finalization stage of each
specification and model of gas cylinder, and it is expressed in milliliters.
3.11 bulge
Bulge refers to visible partial bulging of the gas cylinder.
3.12 buckling
Buckling refers to the failure caused by the plastic liner losing its original regular geometric
shape under the action of compressive stress.
3.13 blister
Blister refers to a local defect in the plastic liner that that looks like a bubble.
3.14 hydrogen storage system
Hydrogen storage system refers to a collection of components related to on-board hydrogen
storage and transmission.
NOTE: it usually consists of gas cylinders (including cylinder valves), valves and connecting
pipelines, etc. For a single gas cylinder, it refers to gas cylinder and cylinder valve; for a
cylinder group consisting of two or more gas cylinders, it refers to gas cylinders (including
cylinder valves), and connecting pipelines and valves within the frame, etc.
4 Technical Requirements
4.1 Types and Descriptions of Gas Cylinder
4.1.1 Type 3 gas cylinder
Fully-wrapped carbon fiber reinforced cylinder with an aluminum alloy liner.
4.1.2 Type 4 gas cylinder
Fully-wrapped carbon fiber reinforced cylinder with a plastic liner.
4.2 Inspection Tools and Devices
The inspection institution shall be equipped with at least the following tools and devices:
a) Explosion-proof lamp: used to inspect the inner and outer surfaces of gas cylinders
and the surface of accessories. The voltage shall not exceed 12 V, and shall satisfy the
requirements of explosion-proof level II class C and group T1 in GB/T 3836.1;
b) Inspectoscope and endoscope: used to inspect the surface of gas cylinder and the inner
surface of gas cylinder (including the inner surface of the neck) that are partially
obscured due to installation. The endoscope shall be in high-definition color and have
the function of storage;
c) Special tools, for example, torque wrench: used for the disassembly and installation
of gas cylinders, cylinder valves or TPRD end plugs;
d) Depth gauge: used to measure the depth of damages, such as: scratches, dents and
abrasions, etc.;
e) Length measurement tools: including rulers, squares and tape measures, which are
used to measure the length of damages, etc.;
f) Hydrostatic test device: used for hydrostatic test of gas cylinders;
g) Air-tightness test device: used for air-tightness test of gas cylinders;
h) Air-tightness helium leak detection device: used for helium leak detection of gas
cylinders; ...
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