This standard specifies the type, parameters, technical requirements, test methods, inspection rules, marking, coating, packing, transportation and storage of seamless steel gas cylinder (hereinafter referred to as "cylinder").
This standard is applicable to design and manufacture movable repeatable-filling steel cylinders used to fill permanent gases or high-pressure liquefied gases with 8~30MPa nominal working pressure and 0.4-80L nominal volume. The operating environment temperature of steel cylinders is -20~60℃ in common areas while -40~60℃ in cold areas.
This standard is not applicable to steel cylinder for dissolved gas or adsorbed gas, steel cylinder used for fire extinction and auxiliary cylinder type pressure vessels on vehicle and machinery equipment.
2 Normative References
GB 222 Method of Sampling Steel for Determination of Chemical Composition and Permissible Variations for Product Analysis.
GB 223.1~223.7 Methods for Chemical Analysis of Iron, Steel and Alloy
GB 224 Determination of Depth of Decarburization of Steel
GB 226 Acid Etching Test Method for Macrostructure and Defect of Steel
GB 228 Metallic Materials-Tensile Testing
GB 230 Metallic Materials-Rockwell Hardness Test
GB 231 Metallic Materials-Brinell Hardness Test
GB 232 Metallic Materials-Bend Test
GB 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels
GB 2106 Metallic Materials-Charpy (V-notch) Impact Test
GB 3077 Alloy Structure Steel-Technical Requirements
GB 4159 Metallic Materials-Charpy Impact Test at Low Temperature
GB 5777 Seamless Steel Pipe and Tubing-Methods for Ultrsonic Testing
GB 6394 Metal-methods for estimating the average grain size
GB 7144 Coloured Cylinder Mark for Gases
GB 8163 Seamless Steel Tubes for Liquid Service
GB 8335 Special Threads for Gas Cylinders
GB 9251 Method for Hydraulic Test of Gas Cylinders
GB 9252 Method for Cycling Test of Gas Cylinders
GB 12137 Method for Leakage Test of Gas Cylinders
GB/T 13005 Terminology of Gas Cylinders
GB/T 13298 Metal-Inspection Method of Microstructure
GB/T 13299 Steel-Determination of Microstructure
GB 13440 Method for Flattening Test of Seamless Gas Cylinders
GB 13447 Steel Blank for Seamless Gas Cylinder
GB 15385 Method for Hydraulic Burst Test of Gas Cylinders
3 Technical Terminology and Symbols
3.1 Permanent gas: refers to the gas whose critical temperature is less than -10℃;
High-pressure liquefied gas: refers to the gas whose critical temperature is larger than or equal to -10℃ and less than or equal to 70℃.
3.2 Nominal working pressure: refers to the limit filling pressure of the gas at reference temperature (20℃ generally) for the cylinder for permanent gas; refers to the upper limit of gas pressure at 60℃ for the cylinder for high-pressure liquefied gas.
3.3 Permissible pressure: refers to the maximum pressure allowed by the cylinder during filling, use, storage and transportation.
3.4 Yield stress: adopts yield point or lower yield point if sharp yield is found in the tensile test for the test portion of the materials or yield strength if no sharp yield.
3.5 Batch: refers to limiting number of cylinder, successively produced having the same design condition, nominal diameter, wall thickness, design, specified material of construction, process of manufacture, and heat treatment specification for continuous heat treatment.
3.6 Design stress factor: refers to ratio of design value of cylinder body material yield stress and cylindrical part equivalent stress under hydraulic test pressure.
3.7 Filling factor: refers to the permissible maximum filling gas weight in unit water volume of the steel cylinder specified in the standard.
3.8 Factor of stress concentration: refers to the ratio of membrane stress of cylinder body and partial maximum stress.
