Seamless aluminum alloy gas cylinders
1 Scope
This standard specifies the types and parameters, technical requirements, test methods and acceptance criteria, inspection rules, marking, coating, packaging, transportation and storage requirements of seamless aluminum alloy gas cylinders (hereinafter referred to as the “aluminum cylinders”).
This standard is applicable to the design and manufacturing of aluminum cylinders with the nominal working pressure of not greater than 30MPa, nominal volume of not greater than 50L and service temperature of -40~60℃, which may be refilled with permanent gas or liquefied gas.
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 191 Packaging - Pictorial marking for handling of goods
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 228.1-2010 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 3191 Aluminum and aluminum alloys extruded bars, rods
GB/T 3246.1 Wrought aluminum and aluminum alloys products inspection method for microstructure
GB/T 3246.2 Wrought aluminum and aluminum alloys products inspection method for macrostructure
GB/T 3880.1~3880.3 Wrought aluminum and aluminum alloy plates, sheets and strips for general engineering
GB/T 3934 Specification of gauges for general purpose screw threads
GB/T 4437.1 Aluminum and aluminum alloy extruded tubes - Part 1 : Seamless tubes
GB/T 6519 Process for ultrasonic inspection of wrought aluminum alloy products
GB 7144 Coloured cylinder mark for gases
GB 8335 Special threads for gas cylinders
GB/T 8336 Special thread gauges for gas cylinders
GB/T 9251 Methods for hydrostatic test of gas cylinders
GB/T 9252 Method for cycling test of gas cylinders
GB/T 12137 Method for leakage test of gas cylinders
GB/T 13005 Terminology of gas cylinders
GB 15385 Method for hydraulic burst test of gas cylinder
GB/T 15970.6-2007 Corrosion of metals and alloys - Stress corrosion testing - Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement
GB/T 20975
(All parts) Methods for chemical analysis of aluminum and aluminum alloys
YS/T 67 Wrought aluminum and aluminum alloy columniform ingots
TSGR 7002 Regulation for type test of gas cylinders
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions established in GB/T 13005 and the following apply.
3.1.1
batch
limited quantity of aluminum cylinders with the same design, the same furnace number and the same manufacturing process, and subjected to continuous heat treatment according to the same heat treatment specification
3.2 Symbols
For the purposes of this document, the following symbols apply.
A Elongation after fracture, %;
C Thickness from bottom grounding point to inner wall, mm;
d Circumferential tear length of bursting breach, mm;
D0 Nominal outer diameter of cylindrical shell, mm;
Df Diameter of indenter for bend test, mm;
H External height of spherical part (shoulder and bottom), mm;
L Length of cylindrical shell, mm;
n Ratio of diameter of indenter for bend test to mean thickness of specimen;
ph Hydrostatic test pressure, MPa;
pb Hydraulic burst test pressure, MPa;
r Inner bottom corner radius, mm;
r1 Inner bottom radius, mm;
R Radius of indenter cutting edge for flattening test, mm;
Rm Actual tensile strength, MPa;
Rp0.2 Specified non-proportional elongation strength, MPa;
S Design wall thickness of cylindrical shell, mm;
Sa0 Actual mean wall thickness of cylindrical shell, mm;
S1 Wall thickness at the center of bottom, mm;
T Indenter spacing for flattening test, mm.
4 Types and parameters
4.1 Types
Generally, the typical structure of aluminum cylinder shall comply with the type shown in Figure 1.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Types and parameters
5 Technical requirements
6 Test methods and acceptance criteria
7 Inspection rules
8 Marking, coating, packaging, transportation and storage
9 Product certificate, and quality certificate for batch inspection
Annex A (Normative) Corrosion test
Annex B (Normative) Crack test under constant load
Annex C (Informative) Gases suitable for filling in aluminum cylinders
Annex D (Informative) Calculation method for shear stress safety factor of thread
Annex E (Normative) Valve installation torque of aluminum cylinder
Annex F (Informative) Description and judgment on manufacturing defects of aluminum cylinders
Annex G (Normative) Flattening test method
Annex H (Informative) Quality certificate for batch inspection of seamless aluminum alloy gas cylinder
