Standard No.:	GB/T 35544-2017
English Name:	Fully-wrapped carbon fiber reinforced cylinders with an aluminum liner for theon-board storage of compressed hydrogen as a fuel for land vehicles
Chinese Name:	车用压缩氢气铝内胆碳纤维全缠绕气瓶
Chinese Classification:	J74    Pressure vessel
Professional Classification:	GB    National Standard
ICS Classification:	23.020.30 23.020.30    Gas pressure vessels, gas cylinders 23.020.30
Issued by:	AQSIQ; SAC
Issued on:	2017-12-29
Implemented on:	2018-7-1
Status:	superseded
Superseded by:	GB/T 35544-2017/XG1-2020 Fully-wrapped carbon fiber reinforced cylinders with an aluminum liner for theon-board storage of compressed hydrogen as a fuel for land vehicles,includes Amendment 1
Superseded on:	2020-4-28
Language:	English
File Format:	PDF
Word Count:	20500 words
Price(USD):	510.0
Delivery:	via email in 1 business day

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 standard is developed in accordance with the rules given in GB/T 1.1-2009. 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 standard was proposed by and is under the jurisdiction of the National Technical Committee on Gas Cylinder of Standardization Administration of China (SAC/TC 31). Fully-wrapped carbon fiber reinforced cylinders with an aluminum liner for the on-board storage of compressed hydrogen as a fuel for land vehicles 1 Scope This standard specifies the types and parameters, technical requirements, test methods, inspection rules, marking, and packaging, transportation and storage requirements of fully-wrapped carbon fiber reinforced cylinders with an aluminum liner for the on-board storage of compressed hydrogen as a fuel for land vehicles (hereinafter referred to as the “cylinders”). This standard is applicable to the design and manufacture of the refillable cylinders that are fixed on land vehicles as fuel tanks to store compressed hydrogen, with a nominal working pressure of not more than 70MPa, a nominal water capacity of not more than 450L, and a working temperature of ≥-40℃ but ≤85℃. Note: Other cylinders for hydrogen supply in hydrogen fuel cell powered urban rail transit, etc. may be manufactured and inspected with reference to this standard. 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. 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 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method (Scales A, B, C, D, E, F, G, H, K, N, T) GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method GB/T 232 Metallic materials - Bend test GB/T 1458 Test method for mechanical properties of ring of filament-winding reinforced plastics GB/T 3191 Aluminium and aluminium alloys extruded bars, rods GB/T 3246.1 Inspection method for structure of wrought aluminum and aluminum alloy products - Part 1 : Inspection method for microstructure GB/T 3362 Test methods for tensile properties of carbon fiber multifilament GB/T 3880.1 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 1: Technical conditions of delivery GB/T 3880.2 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 2: Mechanical properties GB/T 3880.3 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 3: Tolerances on forms and dimensions GB/T 3934 Specification of gauges for general purpose screw threads GB/T 4437.1 Aluminium and aluminium alloy extruded tubes - Part 1 : Seamless tubes GB/T 4612 Plastics - Epoxy compounds - Determination of epoxy equivalent GB/T 6519 Ultrasonic inspection of wrought aluminium and magnesium alloy products GB/T 7690.3 Reinforcements - Test method for yarns - Part 3: Determination of breaking force and breaking elongation for glass fibre GB/T 7762-2014 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain test 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 11640 Seamless aluminum alloy gas cylinders GB/T 12137 Method for leakage test of gas cylinders GB/T 13005 Terminology of gas cylinders GB/T 15385 Method for hydraulic burst test of gas cylinder GB/T 17394.1 Metallic materials - Brinell hardness test - Part 1: Test method GB/T 19466.2 Plastics - Differential scanning calorimetry (DSC) - Part 2: Determination of glass transition temperature GB/T 20668 Unified screw threads - Basic dimensions GB/T 20975 (all parts) Methods for chemical analysis of aluminium and aluminium alloys GB/T 26749 Carbon fiber - Determination of tensile properties of resin-impregnated yarn GB/T 30019 Carbon fiber - Determination of density GB/T 33215 Pressure relief devices for gas cylinders YS/T 67 Wrought aluminium and aluminium alloy columniform ingots 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 and the following apply. 3.1.1 aluminum liner seamless aluminum alloy container that is used for sealing the gas and also can withstand or does not withstand partial pressure loads, with carbon fiber reinforced layer wrapped on the external surface 3.1.2 fully-wrapped a kind of wrapping method to reinforce the cylinder in both the circumferential direction and the axial direction by spirally and circumferentially wrapping the carbon fiber impregnated with resin matrix on the aluminum liner in a continuous manner 3.1.3 fully-wrapped cylinder a kind of cylinder which is reinforced by fully wrapping a carbon fiber reinforced layer on the aluminum liner and is then formed by heating and curing 3.1.4 nominal working pressure the defined filling pressure of cylinder at the reference temperature (15℃) 3.1.5 autofrettage a process of pressurization that the aluminum liner is plastically deformed by applying internal pressure to the cylinder, so that the aluminum liner is subjected to compressive stress and the carbon fiber is subjected to tensile stress when the cylinder is under zero pressure 3.1.6 autofrettage pressure the highest pressure (gauge pressure) applied to the cylinder during autofrettage 3.1.7 batch of cylinder a limited number of cylinders that are under the same design conditions, have the aluminum liners of the same structural dimensions and the same composite materials, and are wrapped and cured by the same process 3.1.8 batch of aluminum liner a limited number of aluminum liners that are under the same design conditions, have the same nominal outer diameter and design wall thickness, are made of the materials of the same furnace No. by the same manufacturing process, and then are subjected to continuous heat treatment according to the same heat treatment specifications and the same process parameters 3.1.9 service life the number of years the cylinder is allowed to be used under specified service conditions 3.1.10 fiber stress ratio the ratio of the stress of carbon fiber when the cylinder is under the minimum burst pressure to that when the cylinder is under the nominal working pressure 3.1.11 rejection elastic expansion; REE the allowable upper limit for the elastic expansion of cylinder specified by the manufacturer in the design finalization stage of each specification/model of cylinder, expressed in milliliters (ml), which shall not exceed 1.1 times the average elastic expansion of the cylinders of the same specification/model in the design finalization batch under the hydrostatic test pressure 3.2 Symbols For the purposes of this document, the following symbols apply. A——the measured percentage elongation after fracture of the aluminum liner material at room temperature, %; ao——the original thickness of the tensile specimen of aluminum liner material, mm; bo——the original width of the tensile specimen of aluminum liner material, mm; Df——the bending center diameter in cold bending test, mm; Do——the nominal outer diameter of the aluminum liner, mm; H——the indenter spacing in the flattening test for aluminum liner material, mm; lo——the original gauge length of the tensile specimen of aluminum liner material, mm; Nd——the design number of cycles of cylinder, times; p——the nominal working pressure of the cylinder, MPa; pbmin——the minimum burst pressure of the cylinder, MPa; pb0——the expected value of the cylinder burst pressure, MPa; pm——the allowable pressure of the cylinder, MPa; ph——the hydrostatic test pressure of the cylinder, MPa; Rp0.2——the 0.2% non-proportional elongation strength of the aluminum liner material at room temperature, MPa; Rm——the measured tensile strength of the aluminum liner material at room temperature, MPa; Sa0——the measured average wall thickness of the cylindrical shell of aluminum liner in the cold bending test, mm; V——the nominal water capacity of cylinder, L. 4 Types, parameters, classification and models 4.1 Types The shell structures of cylinders shall conform to the types shown in Figure 1. Type T is a convex bottom structure, and Type S is a structure closed on both ends. Type T Type S Keys: 1——the carbon fiber wrapping layer; 2——the anti-galvanic corrosion layer; 3——the aluminum liner. Figure 1 Structural type of cylinder 4.2 Parameters 4.2.1 The nominal working pressure of the cylinder shall generally be 25MPa, 35MPa, 50MPa or 70MPa. 4.2.2 The nominal water capacity of the cylinder and the nominal outer diameter of the aluminum liner shall generally be in accordance with those specified in Table 1. Table 1 The nominal water capacity of the cylinder and the nominal outer diameter of the aluminum liner Item Value Permissible deviation/% Nominal water capacity (V)/L ≤120 +5 0 120~450 +2.5 0 Nominal outer diameter of aluminum liner (Do)/mm φ180~φ660 ±1 4.3 Classification The cylinders are classified into the cylinders of Class A and those of Class B. The cylinders of Class A are cylinders with a nominal working pressure less than or equal to 35MPa; the cylinders of Class B are cylinders with a nominal working pressure greater than 35MPa.

Foreword I 1 Scope 2 Normative references 3 Terms, definitions and symbols 4 Types, parameters, classification and models 5 Technical requirements 6 Test methods and acceptance criteria 7 Inspection rules 8 Marking, packaging, transportation and storage 9 Product certificate, and quality certificate for batch inspection Annex A (Informative) Method for determining the maximum allowable defect size of aluminum liners Annex B (Normative) Type test methods and acceptance criteria for temperature-driven pressure relief safety devices and valves Bibliography