Detail of GB 17258-1998

Introduction of GB 17258-1998

1 Scope This standard specifies type and parameter, technical requirements, testing method, test rules, marking, painting, packaging, transport and storage of compressed natural gas steel cylinder for vehicle (hereinafter referred to as steel cylinder). This standard is applicable to steel cylinders whose design/manufacturing nominal working pressure is 16~20 MPa (the pressured referred in this standard is gauge pressure), nominal volume is 30~120L and working temperature is -50℃~60℃. Steel cylinders manufactured according to this standard shall contain only natural gas fuel conforming to the relevant standards, whose moisture content per normal cubic meter is not larger than 8 mg, and hepatic gas content per normal cubic meter is not larger than 20 mg after dewatering, desulfurating and light oil removing. This standard is not applicable to gas steel cylinder used at compressed natural gas refilling station, nor complex material made gas cylinder. 2 Normative References The provisions of the following standard, through reference into this standard, constitute provisions of this standard. When this standard is published, the editions indicated are valid. All standards are subject to revision, and Parties concerned are encouraged to discuss the possibility of applying the latest edition of the following standards. GB 222-84 Method of sampling steel for determination of chemical composition and permissible variations for product analysis GB 223.1-81 Determination of carbon content in iron, steel and alloy GB 223.2-81 Determination of sulphur content in iron, steel and alloy GB/T 223.3-88 Methods for chemical analysis of iron, steel and alloy - the diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content GB 223.4-88 Methods for chemical analysis of iron, steel and alloy - The volumetric method for determination of manganese content by ammonium nitrate oxidation GB 223.5-88 Methods for chemical analysis of iron, steel and alloy - Determination of silicon content with dicarboxyl-ferrous sulphate silicon molybdenum blue photometric method GB/T 223.6-94 Methods for chemical analysis of iron, steel and alloy - The neutralization titrimetric method for the determination of boron content GB 223.7-81 Determination of iron content in alloy and powder GB 224-87 Determination of depth of decarburization of steel GB 226-91 Etch test for macrostructure and defect of steels GB 228-87 Tensile test for metals GB/T 229-94 Metallic materials - Charpy notch impact test GB 230-91 Metallic materials - Rockwell hardness test GB 231-84 Metallic materials - Brinell hardness test GB 232-88 Metallic materials - Bend test GB 1979-80 Diagram of a low magnification texture blemish grading of structural steel GB 5777-86 Seamless steel pipe and tubing - Methods for ultrsonic testing GB 6397-86 Metallic materials--Test pieces for tensile testing GB 7144-86 Color coding for air cylinder GB 8163-87 Seamless steel tubes for liquid service GB 8335-1998 Special threads for gas cylinders GB/T 8336-1998 Special thread gauges for gas cylinders GB/T 9251-1997 Method for hydraulic test of gas cylinders GB 9252-88 Method for cycling test of gas cylinders GB/T 12606-90 Steel tubes and bar - The testing method of magnetic flux leakage GB 12137-89 Method for pneumatic testing of cylinders GB/T 13298-91 Metal - Inspection method of microstructure GB/T 13299-91 Steel - Determination of microstructure GB 13440-92 Method for flattening test of seamless gas cylinders GB 13447-92 Steel blank for seamless gas cylinder GB 15385-94 Method for hydraulic burst test of gas cylinders JB 4730-94 Nondestructive testing of pressure vessels YB/T 5148-93 Metal - Methods for estimating the average grain size 3 Terms and Symbols For the purposes of this standard, the following terms and definitions apply. 3.1 Nominal working pressure Limited filling pressure of a steel cylinder at base temperature (20℃). 3.2 Yield stress Yield point or lower yield point selected for condition with obvious yield; or yield strength selected for condition without obvious yield. 3.3 Measured tensile strength Actually-measured tensile strength obtained according to Article 6.3.2. 3.4 Batch quantity Limited quantity of steel cylinders continuously heat-treated according to same specification of heat treatment under same design condition, having same nominal diameter, design wall thickness, made of same furnace steel with same manufacturing method. 3.5 Stress concentration factor Ratio of local maximum stress and cylinder membrane stress of a steel cylinder.

Contents of GB 17258-1998

Contents 1 Scope 2 Normative References 3 Terms and Symbols 4 Type and Parameter 5 Technical Repuirements 5.1 General requirement on cylinder material 5.2 Steel billet 5.3 Seamless pipe 5.4 Design 5.5 Manufacturing 6 Testing Method 7 Testing Rules 7.1 Allowable manufacturing tolerance of cylinder body 7.2 Requirements on cylinder body inside appearance 7.3 Internal thread of cylinder opening 7.4 Mechanical test 7.5 Hardness test 7.6 Cold bending and flattening test 7.7 Microstructure examination 7.8 Hydrostatic test 7.9 Airtight test 7.10 Bursting test 7.11 Non-destructive detection 7.12 Delivery inspection 7.13 Type inspection 8 Marking, painting, packing and storage 8.1 Marking 8.2 Painting 8.3 Packing 8.4 Transportation 8.5 Storage 9 Installation 10 Quality Certificate and Batch Inspection Certificate Appendix A (Normative) Certificate of quality for batch inspection of Steel Cylinders for the On-board of Compressed Natural Gas as a Fuel for Vehicles