Standard No.:	GB/T 11640-2001
English Name:	Seamless aluminium alloy gas cylinder
Chinese Name:	铝合金无缝气瓶
Professional Classification:	GB    National Standard
Issued by:	AQSIQ
Issued on:	2001-1-10
Implemented on:	2001-10-1
Status:	superseded
Superseded by:	GB 11640-2011 Seamless aluminum alloy gas cylinders
Superseded on:	2012-12-1
Language:	English
File Format:	PDF
Word Count:	10000 words
Price(USD):	250.0
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 revised from GB/T 11640-1989 Seamless Aluminium Alloy Gas Cylinder. Revised content includes: 1. It is recompiled in terms of format and structure according to GB/T 1.1-1993 General Rules for Drafting Standards and GB/T 1.3-1987 Directives for the Work of Standardization--Rules for Drafting Product Standards; 2. Pressure head radius and calculation formula for hydraulic burst pressure in flattening test are modified by reference to ISO 7866: 1999 Refillable Seamless Aluminum Alloy Gas Cylinders-Design, Construction and Testing; 3. The materials (designation: 6061) well known for constructing seamless aluminum alloy gas cylinders are added according to the international standard. 4. Annex A titled "Corrosion Test" is added. 5. Annex B titled “Valve Torque of Aluminum Alloy Gas Cylinder” is added. Annexes A and B of this standard are normative. Annexes C and D of this standard are informative. From the implementation date hereof, this standard replaces GB/T 11640-1989. This standard was proposed by the State Bureau of Quality and Technical Supervision. This standard is under the jurisdiction of National Technical Committee on Gas Cylinders of Standardization Administration of China. Drafting organizations of this standard: Shenyang Kejin New Material Development Corporation, Shanghai High Pressure Vessel Factory, Hua An Machinery Factory. Chief drafters of this standard: Jiang Jiang, Yu Xipei, Chen Hanquan, Xin Huaizhong, Meng Qingquan. Seamless Aluminium Alloy Gas Cylinder 1 Scope This standard specifies the type, parameter, technical requirements, test method, inspection rules, marking, coating, packaging, transportation and storage of the seamless aluminum alloy gas cylinders (hereafter referred to as "the cylinder"). This standard is applicable to the design and manufacture of the portable cylinder: nominal operating pressure: 1~30 MPa; nominal capacity: 0.4~50 L; allowable temperature ≤ 60℃; capable of refilling permanent gas or liquefied gas chemically stable against aluminum alloy. 2 Normative References The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the following standards. GB/T 228-1987 Tensile Test Method for Metal GB/T 230-1991 Metallic Materials—Rockwell Hardness Test GB/T 231-1984 Metallic Materials—Brinell Hardness Test GB/T 232-1999 Metallic Materials—Bend Test GB/T 3191-1998 Extrusion Rods and Bars of Aluminium and Aluminium Alloy GB/T 3246-1982 Aluminium and Aluminium Alloys—Products Inspection Method for Microscopic Structure GB/T 3247-1982 Aluminum and Aluminum Alloys—Inspection Method of Microstructure for Wrought Products GB/T 3880-1997 Aluminium and Aluminium Alloy Rolled Sheet GB/T 4436-1995 Wrought Aluminium and Aluminium Alloy Tubes—Dimensions and Deviations GB/T 4437-1984 Aluminium and Aluminium Alloy Extruded Tubes GB/T 6519-1986 Process for Ultrasonic Inspection of Wrought Aluminum Alloy Products GB/T 6893-1986 Aluminium and Aluminium Alloy Cold Drawn (Rolled) Tubing in Industrial Use GB/T 6987.1~6987.24-1986 Methods for Chemical Analysis of Aluminium and Aluminium Alloys GB 7144-1999 Colored Cylinder Mark for Gases GB 8335-1998 Special Threads for Gas Cylinders GB/T 9251-1997 Methods for Hydrostatic Test of Gas Cylinders GB/T 9252-2001 Method for Cycling Test of Gas Cylinders GB/T 12137-1989 Method for Leakage Test of Gas Cylinders GB/T 13005-1991 Terminology of Gas Cylinders GB/T 13440-1992 Method for Flattening Test of Seamless Gas Cylinders GB 15385-1994 Method for Hydraulic Burst Test of Gas Cylinder 3 Terms and Symbols 3.1 Batch The restricted quantity of cylinders which adopt the same design conditions, nominal diameter as well as design wall thickness and are manufactured with the ingot casting, extruded rod, sheet or pipe in the same furnace and by the same manufacturing method and has been heat treated under the same heat treatment specification. See GB/T 13005 for other terms. 3.2 Symbols Do outside diameter of cylinder, mm; Di inside diameter of cylinder, mm; D′ diameter of circular ring when pressed or tensed, mm; S design wall thickness of the cylinder, mm Sa the minimum wall thickness of the cylinder, mm; Sao measured average wall thickness of cylindrical, mm; Ph hydraulic test pressure, MPa; σb tensile strength guarantee after heat treatment of the cylinder material, MPa; σba measured tensile strength after heat treatment of cylinder material, MPa; σr0.2 specified residual elongation stress guarantee after heat treatment of cylinder material, MPa; σr0.2a actual specified residual elongation stress after heat treatment of cylinder material, MPa; F design stress factor; E elastic modulus of material, MPa; Z correction coefficient; δ5 percentage elongation after fracture, %; Pb calculated hydraulic burst pressure, MPa; N for bend test, it is ratio of diameter of the bending center to measured average wall thickness of specimen; for flattening test, it is ratio of pressure head radius to measured average wall thickness of specimen; Df diameter of the bending center for bend test, mm; Ry pressure head radius for flattening test, mm; T pressure head spacing for flattening test, mm; S1 minimum design thickness of cylinder bottom, mm; H height of ellipsoidal cylinder bottom, mm; r corner radius of dished cylinder bottom, mm; r1 radius of dished cylinder bottom, mm; d circumferential tear length at crevasse, mm. 4 Type and Parameter 4.1 The cylinder shall be as shown in Figure 1 generally. Figure 2 shows the typical structure and major accessories of cylinder. 4.2 Nominal capacity and outside diameter of the cylinder shall be in accordance with those specified in Table 1. Figure 1 Cylinder Type Figure 2 Typical Structure of Cylinder Table 1 Nominal Capacity and Outside Diameter of Cylinder Category Nominal capacity, V, L Allowable deviation of water capacity, % Outside diameter Do, mm Allowable deviation, % Small volume 0.4~2.0 +20 0 60, 70, 89, 108 +1.25 -2.00 2.5~6.3 +10 108, 120, 140 7.0~12.0 0 140, 152, 159,180 Medium volume 13.0~36.0 +5 203, 219 ±1.25 38.0~50.0 0 219, 229, 232 Note: it is allowed to use other values in terms of volume and outside diameter upon the user's request. 5 Technical Requirements 5.1 Materials 5.1.1 Chemical composition of cylinder material shall meet those specified in Table 2. Table 2 Chemical Composition of Cylinder Material % Materials code Element 6061 6351 Si 0.40~0.80 0.70~1.30 Fe ≤0.70 ≤0.50 Cu 0.15~0.40 ≤0.10 Mn ≤0.15 0.40~0.80 Mg 0.80~1.20 0.40~0.80 Cr 0.04~0.35 Zn ≤0.25 ≤0.20 Ti ≤0.15 ≤0.20 Others Single ≤0.05 ≤0.05 Total ≤0.15 ≤0.15 A1 Margin Margin Remarks Preferred 5.1.2 Other aluminium alloy materials with good processing property and higher resistance to corrosion can be used for the cylinder but shall be subjected to corrosion test. See Annex A (Normative) for the corrosion test. 5.1.3 The materials for manufacturing the cylinder must be provided with quality certificate of smelting plant and shall be eligible for reinspection made by the cylinder manufacturer before being put into production. 5.1.4 Ingot casting a) The surface shall be clean and free from mould spot, slag, interlayer, crack and metallic inclusions but the repair marks in smooth transition are allowed. b) Fracture structure shall be compact and free from any defect, like gas cavity, shrink hole, crack and other inclusion, resulting in the influence on mechanical property. c) Segregation shall not happen and the grain size shall be Grade 2 or higher as specified in GB/T 3247-1982. d) 100% ultrasonic test must be carried out axially in two orthogonal directions, axially along ingot casting and perpendicular to ingot casting axis. The maximum flaw echo shall not be larger than that of the reference block. The reference block shall be made of materials of the same chemical composition and the flat-bottom pore diameter is 2mm. 5.1.5 Extruded rod a) It shall comply with GB/T 3191 except chemical composition. b) It must be qualified upon the 100% ultrasonic test carried out in accordance with 5.1.4d). 5.1.6 Plates a) It shall meet the requirements of GB/T 3880 except chemical composition. b) It must be qualified upon the 100% ultrasonic test carried out in accordance with GB/T 6519. 5.1.7 Tubes a) It shall meet the requirements of GB/T 4437 except chemical composition; b) Overall dimension, wall thickness tolerance and quality of the outer and inner surface shall comply with GB/T 4436, GB/T 4437 or GB/T 6893; c) Ingot casting of production tubes must be qualified upon 100% ultrasonic test carried out in accordance with 5.1.4d). 5.2 Design 5.2.1 The calculation of the cylinder wall thickness shall be subject to the hydraulic test pressure which is 1.5 times the nominal operating pressure.

Foreword i 1 Scope 2 Normative References 3 Terms and Symbols 4 Type and Parameter 5 Technical Requirements 6 Test Method 7 Inspection Rules 8 Marking, Coating, Packaging, Transportation and Storage 9 Product Certificate and Batch Inspection Certificate Annex A (Normative) Corrosion Test Annex B (Normative) Valve Torque of Aluminum Alloy Gas Cylinder Annex C (Informative) Recommended Gases Filled in the Cylinder Annex D (Informative) Batch Inspection Certificate for Seamless Aluminum Alloy Gas Cylinders