GB/T 42612-2023 Fully-wrapped carbon fiber reinforced cylinder with a plastic liner for the on-board storage of compressed hydrogen as a fuel for land vehicles (English Version)
Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document is drafted with reference to ISO 19881:2018 Gaseous hydrogen - Land vehicle fuel containers, and is not equivalent to ISO 19881:2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of the National Technical Committee on Gas Cylinder of Standardization Administration of China (SAC/TC 31).
This document is under the jurisdiction of National Technical Committee on Gas Cylinder of Standardization Administration of China (SAC/TC 31) and National Technical Committee on Hydrogen Energy of Standardization Administration of China (SAC/TC 309).
Fully-wrapped carbon fiber reinforced cylinders with a plastic liner for the on-board storage of compressed hydrogen as a fuel for land vehicles
1 Scope
This standard specifies the types and parameters, classification, models, technical requirements, test methods, inspection rules, installation, protection, marking, packaging, transportation and storage requirements of fully-wrapped carbon fiber reinforced cylinders with a plastic liner for the on-board storage of compressed hydrogen as a fuel for land vehicles (hereinafter referred to as "the cylinder").
This standard is applicable to the design and manufacture of refillable on-board cylinders which are used for storing hydrogen fuel on motor vehicles, with a nominal working pressure of 35 MPa and 70 MPa, a nominal volume of more than or equal to 20 L but not more than 450 L, and a working temperature of not lower than -40°C but not higher than 85°C.
This document may serve as a reference for hydrogen supply cylinders for hydrogen fuel cell powered urban rail transit, hydrogen-powered vessels, hydrogen-powered aircrafts, and hydrogen power generating units.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.4 Alloyed steel - Determination of manganese content - Potentiometric or visual titration method
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.28 Methods for chemical analysis of iron steel and alloy - The α-Benzoinoxime gravimetric method for the determination of molybdenum content
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.61 Methods for chemical analysis of iron, steel and alloy - The ammonium phosphomolybdate volumetric method for the determination of phosphorus content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content
GB/T 223.64 Iron steel and alloyed - Determination of manganese content - Flame atomic absorption spectrometric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
GB/T 223.72 Iron, steel and alloy - Determination of sulfur content - Gravimetric method
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace
GB/T 223.86 Steel, iron and alloy - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
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 533-2008 Rubber vulcanized or thermoplastic - Determination of density
GB/T 1040.1 Plastics - Determination of tensile properties - Part 1: General principles
GB/T 1040.2-2022 Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics
GB/T 1220 Stainless steel bars
GB/T 1458 Test method for mechanical properties of ring of filament-winding reinforced plastics
GB/T 1633-2000 Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST)
GB/T 1636-2008 Plastics - Determination of apparent density material that can be poured from a specified funnel
GB/T 1677 Determinating the epoxy value of plasticizers
GB/T 2941-2006 Rubber - General procedures for preparing and conditioning test pieces for physical test methods
GB/T 3190 Wrought aluminium and aluminium alloy - Chemical composition
GB/T 3191 Aluminium and aluminium alloys extruded bars, rods
GB/T 3362 Test methods for tensile properties of carbon fiber multifilament
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 - Air-oven method
GB/T 3682.1-2018 Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics - Part 1: Standard method
GB/T 4612 Plastics - Epoxy compounds - Determination of epoxy equivalent
GB/T 5720 Test methods for rubber O-rings
GB/T 6031 Rubber, vulcanized or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100 IRHD)
GB/T 7758 Rubber, vulcanized - Determination of low-temperature characteristics - Temperature-retraction procedure (TR test)
GB/T 7759.1-2015 Rubber, vulcanized or thermoplastic - Determination of compression set - Part 1: At ambient or elevated temperatures
GB/T 7999 Optical emission spectrometric analysis method of aluminum and aluminum alloys
GB/T 9251 Methods for hydrostatic test of gas cylinders
GB/T 9252 Method for pressure cycling test of gas cylinders
GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method)
GB/T 13005 Terminology of gas cylinders
GB/T 13262 Single sampling procedures and tables for inspection having desired operating characteristics by attributes for percent nonconforming
GB/T 13264 Sampling procedures and tables for small lot inspection by attributes for percent nonconforming items
GB/T 13979 Mass spectrometer leak detector
GB/T 15385 Method for hydraulic burst test of gas cylinder
GB/T 15823 Non-destructive testing - Test methods for helium leak testing
GB/T 19466.2 Plastics - Differential scanning calorimetry (DSC) - Part 2: Determination of glass transition temperature
GB/T 19466.3 Plastics - Differential scanning calorimetry (DSC) - Part 3: Determination of temperature and enthalpy of melting and crystalliation
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20975 (all parts) Methods for chemical analysis of aluminium and aluminium alloys
GB/T 21060-2007 Plastics - Determination of pourability
GB/T 21843 Plastics - Vinyl chloride homopolymer and copolymer resins - Particle size determination by mechanical sieving
GB/T 32249 Aluminum and aluminum-alloy die forgings, hand forgings and rolled ring forgings - General specification
GB/T 33215 Pressure relief devices for gas cylinders
GB/T 37244 Fuel specification for proton exchange membrane fuel cell vehicles - Hydrogen
GB/T 42536 Assembly valve on high pressure hydrogen storage cylinder for vehicles
GB/T 42610 Test method for evaluating hydrogen compatibility of plastic liner of high pressure gaseous hydrogen cylinders
HG/T 4280 Welding procedure qualification for plastics
JJG 539-2016 Digital indicating weighing instruments
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment
NB/T 47013.8 Nondestructive testing of pressure equipments - Part 8: Leakage testing
TSG D0001 Pressure pipe safety technology supervision regulation for industrial pressure pipe
YS/T 479 Wrought aluminum and aluminum alloy for general engineering
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 as well as the following apply.
3.1.1
plastic liner
inner plastic housing that is used for sealing the gas and designed to withstand no pressure load, with carbon fiber reinforced layer wrapped on the external surface
3.1.2
seamless plastic liner
unibody plastic liner without splicing weld
3.1.3
welded plastic liner
plastic liner with splicing weld
3.1.4
thermally-activated pressure relief device (TPRD) end plug
end plug installed at one end of cylinder with openings on both ends, equipped with thermally-activated pressure relief device (hereinafter referred to as "TPRD") and with end plug of blind flange function
3.1.5
fully-wrapping
wrapping method to reinforce the strength of cylinder in both circumferential and axial directions by wrapping the continuous carbon fiber impregnated with resin matrix spirally and circumferentially on the plastic liner
3.1.6
fully-wrapped cylinder
cylinder formed by thermal curing after fully wrapping the plastic liner with cylinder valve boss (hereinafter referred to as "the liner")
3.1.7
nominal working pressure
defined filling pressure of cylinder at the reference temperature (15°C)
3.1.8
allowable pressure
maximum allowable pressure of the cylinder during filling and use
3.1.9
batch of gas cylinder
limited number of cylinders that follow the same design, have plastic liners and cylinder valve bosses of the same materials and structural dimensions, are made of the same composite materials, and produced by the same process
3.1.10
batch of liner
limited number of liners that follow the same design, have cylinder valve bosses of the same materials and structural dimensions, have the same structural dimensions and are made of plastic material of the same batch number with the same production process
3.1.11
batch of O-ring
limited number of O-rings that follow the same design, have the same structural dimensions, and are made of material of the same batch number with the same production process
3.1.12
service life
number of years the cylinder is allowed to be used under specified service conditions
3.1.13
fiber stress ratio
ratio of the stress of carbon fiber when the cylinder is under the minimum design burst pressure to that when the cylinder is under the nominal working pressure
3.1.14
liner buckling
failure caused by liner losing its original regular geometry under the action of compressive stress
3.1.15
leakage
the process in which hydrogen in a cylinder is released to the atmosphere through the interface gap or through the wall thickness defect
3.2 Symbols
For the purposes of this document, the following symbols apply.
b——the misalignment, mm;
K——the center height of flanged edge of weld, mm;
Nd——the design number of cycles of the cylinder, times;
Nieq——the nickel equivalent, %;
P——the nominal working pressure of the cylinder, MPa;
Pbmin——the minimum design burst pressure of the cylinder, MPa;
Pb0——the expected value of the cylinder burst pressure, MPa;
Ph——the hydrostatic test pressure of the cylinder, MPa;
Pm——the allowable pressure of the cylinder, MPa;
t——the thickness of plastic liner, mm;
V——the nominal volume of the cylinder, L;
WC——the mass fraction of carbon in steel, %;
WCr——the mass fraction of chromium in steel, %;
Wsi——the mass fraction of silicon in steel, %;
WMo——the mass fraction of molybdenum in steel, %;
WMn——the mass fraction of manganese in steel, %;
WNi——the mass fraction of nickel in steel, %.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Types, parameters, classification and models
5 Technical requirements and test methods
6 Inspection rules
7 Installation and protection
8 Marking, packaging, transportation and storage
9 Product certificate, and quality certificate for batch inspection
Annex A (Nominative) Tolerance of test parameters
Annex B (Nominative) Routine maintenance and inspection of cylinders
Annex C (Normative) Evaluation method for compatibility of plastic liner of the cylinder and hydrogen
Annex D (Normative) Performance evaluation method of O-ring for cylinder
Annex E (Normative) Welding procedure qualification method of cylinder plastic liner
Annex F (Informative) Visual ultrasonic phased array testing and quality grading method for welded joints of plastic liners of cylinders
Annex G (Normative) Interlaminar shear test method
Annex H (Normative) Helium leakage detection method for the cylinder air tightness
Annex I (Nominative) Test method for ignition of cylinder
Annex J (Informative) Quality certificate for batch inspection of fully-wrapped carbon fiber reinforced cylinder with a plastic liner for on-board storage of compressed hydrogen for land vehicles
Bibliography
GB/T 42612-2023 Fully-wrapped carbon fiber reinforced cylinder with a plastic liner for the on-board storage of compressed hydrogen as a fuel for land vehicles (English Version)
Standard No.
GB/T 42612-2023
Status
valid
Language
English
File Format
PDF
Word Count
35000 words
Price(USD)
990.0
Implemented on
2024-6-1
Delivery
via email in 1 business day
Detail of GB/T 42612-2023
Standard No.
GB/T 42612-2023
English Name
Fully-wrapped carbon fiber reinforced cylinder with a plastic liner for the on-board storage of compressed hydrogen as a fuel for land vehicles
Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document is drafted with reference to ISO 19881:2018 Gaseous hydrogen - Land vehicle fuel containers, and is not equivalent to ISO 19881:2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of the National Technical Committee on Gas Cylinder of Standardization Administration of China (SAC/TC 31).
This document is under the jurisdiction of National Technical Committee on Gas Cylinder of Standardization Administration of China (SAC/TC 31) and National Technical Committee on Hydrogen Energy of Standardization Administration of China (SAC/TC 309).
Fully-wrapped carbon fiber reinforced cylinders with a plastic liner for the on-board storage of compressed hydrogen as a fuel for land vehicles
1 Scope
This standard specifies the types and parameters, classification, models, technical requirements, test methods, inspection rules, installation, protection, marking, packaging, transportation and storage requirements of fully-wrapped carbon fiber reinforced cylinders with a plastic liner for the on-board storage of compressed hydrogen as a fuel for land vehicles (hereinafter referred to as "the cylinder").
This standard is applicable to the design and manufacture of refillable on-board cylinders which are used for storing hydrogen fuel on motor vehicles, with a nominal working pressure of 35 MPa and 70 MPa, a nominal volume of more than or equal to 20 L but not more than 450 L, and a working temperature of not lower than -40°C but not higher than 85°C.
This document may serve as a reference for hydrogen supply cylinders for hydrogen fuel cell powered urban rail transit, hydrogen-powered vessels, hydrogen-powered aircrafts, and hydrogen power generating units.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.4 Alloyed steel - Determination of manganese content - Potentiometric or visual titration method
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.28 Methods for chemical analysis of iron steel and alloy - The α-Benzoinoxime gravimetric method for the determination of molybdenum content
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.61 Methods for chemical analysis of iron, steel and alloy - The ammonium phosphomolybdate volumetric method for the determination of phosphorus content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content
GB/T 223.64 Iron steel and alloyed - Determination of manganese content - Flame atomic absorption spectrometric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
GB/T 223.72 Iron, steel and alloy - Determination of sulfur content - Gravimetric method
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace
GB/T 223.86 Steel, iron and alloy - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
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 533-2008 Rubber vulcanized or thermoplastic - Determination of density
GB/T 1040.1 Plastics - Determination of tensile properties - Part 1: General principles
GB/T 1040.2-2022 Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics
GB/T 1220 Stainless steel bars
GB/T 1458 Test method for mechanical properties of ring of filament-winding reinforced plastics
GB/T 1633-2000 Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST)
GB/T 1636-2008 Plastics - Determination of apparent density material that can be poured from a specified funnel
GB/T 1677 Determinating the epoxy value of plasticizers
GB/T 2941-2006 Rubber - General procedures for preparing and conditioning test pieces for physical test methods
GB/T 3190 Wrought aluminium and aluminium alloy - Chemical composition
GB/T 3191 Aluminium and aluminium alloys extruded bars, rods
GB/T 3362 Test methods for tensile properties of carbon fiber multifilament
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 - Air-oven method
GB/T 3682.1-2018 Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics - Part 1: Standard method
GB/T 4612 Plastics - Epoxy compounds - Determination of epoxy equivalent
GB/T 5720 Test methods for rubber O-rings
GB/T 6031 Rubber, vulcanized or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100 IRHD)
GB/T 7758 Rubber, vulcanized - Determination of low-temperature characteristics - Temperature-retraction procedure (TR test)
GB/T 7759.1-2015 Rubber, vulcanized or thermoplastic - Determination of compression set - Part 1: At ambient or elevated temperatures
GB/T 7999 Optical emission spectrometric analysis method of aluminum and aluminum alloys
GB/T 9251 Methods for hydrostatic test of gas cylinders
GB/T 9252 Method for pressure cycling test of gas cylinders
GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method)
GB/T 13005 Terminology of gas cylinders
GB/T 13262 Single sampling procedures and tables for inspection having desired operating characteristics by attributes for percent nonconforming
GB/T 13264 Sampling procedures and tables for small lot inspection by attributes for percent nonconforming items
GB/T 13979 Mass spectrometer leak detector
GB/T 15385 Method for hydraulic burst test of gas cylinder
GB/T 15823 Non-destructive testing - Test methods for helium leak testing
GB/T 19466.2 Plastics - Differential scanning calorimetry (DSC) - Part 2: Determination of glass transition temperature
GB/T 19466.3 Plastics - Differential scanning calorimetry (DSC) - Part 3: Determination of temperature and enthalpy of melting and crystalliation
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20975 (all parts) Methods for chemical analysis of aluminium and aluminium alloys
GB/T 21060-2007 Plastics - Determination of pourability
GB/T 21843 Plastics - Vinyl chloride homopolymer and copolymer resins - Particle size determination by mechanical sieving
GB/T 32249 Aluminum and aluminum-alloy die forgings, hand forgings and rolled ring forgings - General specification
GB/T 33215 Pressure relief devices for gas cylinders
GB/T 37244 Fuel specification for proton exchange membrane fuel cell vehicles - Hydrogen
GB/T 42536 Assembly valve on high pressure hydrogen storage cylinder for vehicles
GB/T 42610 Test method for evaluating hydrogen compatibility of plastic liner of high pressure gaseous hydrogen cylinders
HG/T 4280 Welding procedure qualification for plastics
JJG 539-2016 Digital indicating weighing instruments
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment
NB/T 47013.8 Nondestructive testing of pressure equipments - Part 8: Leakage testing
TSG D0001 Pressure pipe safety technology supervision regulation for industrial pressure pipe
YS/T 479 Wrought aluminum and aluminum alloy for general engineering
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 as well as the following apply.
3.1.1
plastic liner
inner plastic housing that is used for sealing the gas and designed to withstand no pressure load, with carbon fiber reinforced layer wrapped on the external surface
3.1.2
seamless plastic liner
unibody plastic liner without splicing weld
3.1.3
welded plastic liner
plastic liner with splicing weld
3.1.4
thermally-activated pressure relief device (TPRD) end plug
end plug installed at one end of cylinder with openings on both ends, equipped with thermally-activated pressure relief device (hereinafter referred to as "TPRD") and with end plug of blind flange function
3.1.5
fully-wrapping
wrapping method to reinforce the strength of cylinder in both circumferential and axial directions by wrapping the continuous carbon fiber impregnated with resin matrix spirally and circumferentially on the plastic liner
3.1.6
fully-wrapped cylinder
cylinder formed by thermal curing after fully wrapping the plastic liner with cylinder valve boss (hereinafter referred to as "the liner")
3.1.7
nominal working pressure
defined filling pressure of cylinder at the reference temperature (15°C)
3.1.8
allowable pressure
maximum allowable pressure of the cylinder during filling and use
3.1.9
batch of gas cylinder
limited number of cylinders that follow the same design, have plastic liners and cylinder valve bosses of the same materials and structural dimensions, are made of the same composite materials, and produced by the same process
3.1.10
batch of liner
limited number of liners that follow the same design, have cylinder valve bosses of the same materials and structural dimensions, have the same structural dimensions and are made of plastic material of the same batch number with the same production process
3.1.11
batch of O-ring
limited number of O-rings that follow the same design, have the same structural dimensions, and are made of material of the same batch number with the same production process
3.1.12
service life
number of years the cylinder is allowed to be used under specified service conditions
3.1.13
fiber stress ratio
ratio of the stress of carbon fiber when the cylinder is under the minimum design burst pressure to that when the cylinder is under the nominal working pressure
3.1.14
liner buckling
failure caused by liner losing its original regular geometry under the action of compressive stress
3.1.15
leakage
the process in which hydrogen in a cylinder is released to the atmosphere through the interface gap or through the wall thickness defect
3.2 Symbols
For the purposes of this document, the following symbols apply.
b——the misalignment, mm;
K——the center height of flanged edge of weld, mm;
Nd——the design number of cycles of the cylinder, times;
Nieq——the nickel equivalent, %;
P——the nominal working pressure of the cylinder, MPa;
Pbmin——the minimum design burst pressure of the cylinder, MPa;
Pb0——the expected value of the cylinder burst pressure, MPa;
Ph——the hydrostatic test pressure of the cylinder, MPa;
Pm——the allowable pressure of the cylinder, MPa;
t——the thickness of plastic liner, mm;
V——the nominal volume of the cylinder, L;
WC——the mass fraction of carbon in steel, %;
WCr——the mass fraction of chromium in steel, %;
Wsi——the mass fraction of silicon in steel, %;
WMo——the mass fraction of molybdenum in steel, %;
WMn——the mass fraction of manganese in steel, %;
WNi——the mass fraction of nickel in steel, %.
Contents of GB/T 42612-2023
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Types, parameters, classification and models
5 Technical requirements and test methods
6 Inspection rules
7 Installation and protection
8 Marking, packaging, transportation and storage
9 Product certificate, and quality certificate for batch inspection
Annex A (Nominative) Tolerance of test parameters
Annex B (Nominative) Routine maintenance and inspection of cylinders
Annex C (Normative) Evaluation method for compatibility of plastic liner of the cylinder and hydrogen
Annex D (Normative) Performance evaluation method of O-ring for cylinder
Annex E (Normative) Welding procedure qualification method of cylinder plastic liner
Annex F (Informative) Visual ultrasonic phased array testing and quality grading method for welded joints of plastic liners of cylinders
Annex G (Normative) Interlaminar shear test method
Annex H (Normative) Helium leakage detection method for the cylinder air tightness
Annex I (Nominative) Test method for ignition of cylinder
Annex J (Informative) Quality certificate for batch inspection of fully-wrapped carbon fiber reinforced cylinder with a plastic liner for on-board storage of compressed hydrogen for land vehicles
Bibliography
