GB 5842-2023 English PDFUS$649.00 · In stock
Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 5842-2023: Liquefied petroleum steel gas cylinders Status: Valid GB 5842: Historical versions
Basic dataStandard ID: GB 5842-2023 (GB5842-2023)Description (Translated English): Liquefied petroleum steel gas cylinders Sector / Industry: National Standard Classification of Chinese Standard: J74 Classification of International Standard: 23.020.30 Word Count Estimation: 32,345 Date of Issue: 2023-11-27 Date of Implementation: 2023-12-01 Older Standard (superseded by this standard): GB/T 5842-2022 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB 5842-2023: Liquefied petroleum steel gas cylinders---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.National Standard of the People's Republic of China Replace GB/T 5842-2022 LPG cylinders Released on 2023-11-27 2023-12-01 Implementation State Administration for Market Regulation The National Standardization Administration issued 1 ScopeThis document specifies the types, models, basic parameters, materials, design, manufacturing, and testing methods of liquefied petroleum gas cylinders (hereinafter referred to as cylinders). Requirements for production and transportation, production methods, inspection rules, marking, packaging, coating, storage and transportation, and factory documents. This document is applicable to the use of normal ambient temperature (-40℃~60℃), with a nominal working pressure of 2.1MPa and a nominal volume of Gas cylinders with a capacity of more than 150L and capable of repeatedly containing liquefied petroleum gas that complies with GB 11174.2 Normative referencesThe contents of the following documents constitute the essential clauses of this document through normative references in this text. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 150.3 Pressure Vessels Part 3.Design GB/T 222 Permissible deviation of chemical composition of finished steel products GB/T 228.1 Tensile test of metallic materials Part 1.Room temperature test method GB/T 1804 General tolerances Tolerances of linear and angular dimensions without tolerance indication GB/T 2651 Destructive tests on welds of metallic materials - Transverse tensile tests GB/T 2653 Welded joint bending test method GB/T 6653 Steel plates and strips for welded gas cylinders GB/T 7144 Color marking of gas cylinders GB 7512 Liquefied petroleum gas cylinder valve GB/T 8335 Special threads for gas cylinders GB/T 9251 Gas cylinder water pressure test method GB/T 9252 Gas cylinder pressure cycle test method GB/T 12137 Test method for gas cylinder air tightness GB/T 13005 Gas Cylinder Terminology GB/T 15385 Gas cylinder hydraulic burst test method GB/T 17925 X-ray digital imaging inspection of butt welds of gas cylinders GB/T 33209 Welding procedure assessment for welding gas cylinders GB/T 35208 Self-closing liquefied petroleum gas cylinder valve CJ/T 33 Heat treatment process assessment for liquefied petroleum gas cylinders NB/T 47013.2 Nondestructive testing of pressure equipment Part 2.Radiographic testing TSG23 Gas Cylinder Safety Technical Regulations3 Terms and definitionsThe terms and definitions defined in GB/T 13005 and the following apply to this document.4 SymbolsThe following symbols apply to this document (see Table 1). 5 Type, model and basic parameters 5.1 Model Indication The gas cylinder model is indicated as follows. Note. The modification number is used to indicate that the structure, gas supply method, etc. of a certain type of gas cylinder in the YSP series has changed; if there is no change, the modification number may not be marked. 5.2 Models and parameters Gas cylinders shall be designed and manufactured in accordance with the specifications in Table 2.YSP118/49.5 and YSP118/Liquid/49.5 gas cylinders shall not be equipped with Other types of gas cylinders should not be installed indoors in crowded places in the buildings they serve. 5.3 Structural type 6.1 General 6.1.1 The material of the gas cylinder body (referring to the cylinder, head and other pressure-bearing components) should have good ductility and welding performance; and should be accompanied by material quality Original certificate of quantity or electronic version of QR code material quality certificate. 6.1.2 The gas cylinder manufacturing unit shall verify the chemical composition of the main materials according to the furnace and tank number, verify the mechanical properties according to the batch number, and verify the compliance. The material of the standard shall be marked. Verify the analysis results. the chemical composition shall comply with the requirements of Table 3; the mechanical properties shall comply with the requirements of 6.3.1. The allowable deviation of chemical composition shall comply with the provisions of GB/T 222. 6.1.3 All accessories welded to the main body of the gas cylinder should be made of materials with welding properties compatible with the main body material. 6.1.4 The tensile strength of welds made with the welding consumables used shall not be lower than the lower limit of the specified tensile strength of the parent material. 6.1.5 Materials (including welding materials) should comply with the requirements of relevant standards. 6.2 Chemical composition The chemical composition (mass fraction) of the main material shall comply with the requirements of Table 3. 6.3 Mechanical properties 6.3.1 The mechanical properties of the main material shall comply with the requirements of GB/T 6653. 6.3.2 Yield strength ratio of main material (ReL/Rm). When the tensile strength of the material is ≥490MPa, ReL/Rm should be ≤0.85; When the temperature is less than 490MPa, ReL/Rm should be ≤0.75.7 Design7.1 General 7.1.1 The design documents of gas cylinders shall be verified by the design document appraisal. When the regulatory authorities require, the gas cylinder manufacturer shall reapply for the design document appraisal. Identification. 7.1.2 When the gas cylinder body is composed of two parts, there should be only one girth weld and the gas cylinder body should be assembled with a lock bottom joint. There should be two circumferential welds and one longitudinal weld (the longitudinal weld should not have a permanent lining), and the head and cylinder should be assembled with a lock bottom joint. 7.1.3 When designing and calculating the wall thickness of the pressure-bearing components of gas cylinders, the material strength parameter should be the lower yield strength (ReL). 7.1.4 The shape of the gas cylinder head should be elliptical. 7.2 Calculation of bottle wall thickness 7.2.1 The calculated wall thickness of the shell and the calculated wall thickness of the straight edge of the head (S1) are calculated according to formula (1). 7.2.2 The wall thickness (S2) of the curved surface of the head shall be calculated according to formula (2). 7.2.3 The design wall thickness of the shell and head of YSP118/49.5 and YSP118/liquid/49.5 specifications are calculated according to formula (1) and formula (2) respectively. For other specifications, the design wall thickness (S) of the bottle body shall be the larger value calculated by formula (1) or formula (2). 7.2.4 In addition to meeting the requirements of the calculation results of formula (1) and formula (2), the design wall thickness of the bottle body shall also meet the requirements of the calculation results of formula (3). The result requirement should not be less than 1.5mm. 7.2.5 The nominal wall thickness of the cylinder body and the head should be equal. When determining the nominal wall thickness (S0), attention should be paid to the negative thickness deviation of the steel plate and the process reduction. Thin quantity. 7.3 Attachments 7.3.1 Accessories should be designed to facilitate welding and inspection. 7.3.2 The gas cylinder should be equipped with a shield to protect the cylinder valve and a base to keep the cylinder stable. The shield and base should be welded to the cylinder body. The structural shape of the base and its connection with the gas cylinder should prevent liquid accumulation and have sufficient strength and rigidity. The upper edge of the shield should be made into an arc. The base should have ventilation holes and drainage holes. 7.3.3 The valves used for gas cylinders shall comply with the requirements of GB 7512 or GB/T 35208, and the selected model shall be covered by the valve type test certificate. within the range. 7.3.4 The thread of the gas cylinder valve seat should match the thread of the cylinder valve and comply with the provisions of GB/T 8335; the gas phase valve seat should use PZ27.8 cone thread. The diameter of the head opening corresponding to the gas phase valve seat should be no less than 40mm, and the liquid phase valve seat should use PZ39.0 tapered thread, which is consistent with the liquid phase valve seat. The corresponding head opening diameter should be no less than 55mm, and the inner diameter of the liquid phase tube should be no less than 14mm. 7.3.5 The threaded connection between the cylinder valve and the valve seat should be sealed, and the sealing material should be compatible with the liquefied petroleum gas medium. 7.3.6 It is not allowed to make holes on the shell. The holes on the head should comply with the requirements of GB/T 150.3.If reinforcement is needed, the holes should be reinforced. For gas cylinders with liquid phase pipes, when opening a hole on the head, the projected distance between the center line of the hole and the outer circumference of the head should be within 30% of the outer diameter of the bottle body. Within 35%.8 Manufacturing8.1 Welding procedure qualification 8.1.1 Welding procedure qualification shall be carried out in accordance with GB/T 33209. 8.1.2 Welders and non-destructive testing personnel who carry out welding procedure assessment shall comply with the requirements of 8.2.1 and 9.1.2 respectively. 8.1.3 The welds for welding procedure qualification shall be representative of the butt welds and fillet welds of the pressure-bearing components of the gas cylinder. The welding process of electronically readable marks such as QR codes (see Figure 2) should also be evaluated. The evaluation items are low-magnification metallographic examinations. The evaluation requires the weld metallurgy to be There should be no cracks or unfused metals, fusion zones and heat affected zones. 8.1.4 Welding procedure assessment should be carried out on the cylinder body and shield of the gas cylinder. 8.1.5 The results of the welding process assessment shall be reviewed and approved by the technical director of the gas cylinder manufacturing unit and stored in the company's technical files. 8.2 Welding 8.2.1 The welder who welds the gas cylinder shall hold a valid special equipment qualification certificate. The welder code shall be marked in a prominent position on the gas cylinder or on the welding record. The signature on the record is traceable. 8.2.2 The butt welds of the bottle body and the fillet welds of the valve seat shall be welded by automatic welding method, and the electronic label or QR code etc. shall be welded on the shield. The sub-readable mark should be welded by laser welding. 8.2.3 The shape and size of the welding groove shall comply with the requirements of the drawing. The groove surface shall be clean and smooth, without cracks, delamination and slag inclusions. Defects and other residual substances. 8.2.4 Welding (including welding repair) should be carried out indoors, and the relative humidity should not be greater than 90%. 8.2.5 When welding, the arc should not be struck at non-welding locations. The longitudinal weld should have an arc striking plate and an arc extinguishing plate, and the length of the plate should not be less than 100 mm. When arcing the plate, it should not be knocked, but cut away, and the cut part should be smoothed. 8.3 Welds 8.3.1 The butt welds of the cylinder body and the fillet welds of the valve seat should be fully penetrated. 8.3.2 The appearance of the weld shall comply with the following requirements. a) The weld and heat-affected zone should not have defects such as cracks, pores, arc pits, slag inclusions and lack of fusion; b) The weld of the bottle body should not undercut, and the weld of the bottle body accessories should not undercut on one side of the bottle body; c) There should be no depressions or irregular changes on the weld surface; d) The spatter on both sides of the weld should be cleaned; e) The height of the bottle body butt weld is 0mm~2.5mm; the difference between the widest and narrowest parts of the same weld should not be greater than 4mm; f) When there is no specification in the drawing, the height of the fillet weld leg should not be less than the thickness of the thinner part of the weld, and its geometric shape should be smooth transition to the surface of the parent material. 8.4 Weld repair 8.4.1 Weld repair should have an approved repair process and should be strictly implemented. 8.4.2 The repaired butt welds shall be re-inspected visually and radiographically and shall pass the inspection. 8.4.3 The number of repairs on the same part of the weld should not exceed 1 time. 8.4.4 The repaired parts should be recorded in the product production inspection record. 8.5 Cylinder 8.5.1 When the cylinder is made of steel plates rolled and welded, the rolling direction of the steel plates should be consistent with the circumferential direction of the cylinder. 8.5.2 The cylinder body after welding shall meet the following requirements. a) The difference between the maximum and minimum diameters of the same cross section of the cylinder shall not exceed 0.01D; b) The misalignment of the longitudinal weld of the shell (b) shall not exceed 0.1S0 (see Figure 3); c) When measured with a sample with a length of D/2 and less than or equal to 300 mm, the angular height (E) of the longitudinal weld of the cylinder should not be greater than 0.1S0 2mm (see Figure 4). 8.6 Head 8.6.1 The head shall be made of a whole piece of steel plate. The stretching reduction of the head shall not be greater than 10% of the actual thickness of the steel plate before stretching. 8.6.2 The measured value of the minimum wall thickness of the head should not be less than the designed wall thickness of the bottle body (S). 8.6.3 The difference between the maximum and minimum diameters of the same cross section of the head should not be greater than 2mm, and the height deviation of the head should be 0mm~5mm. 8.6.4 The depth of longitudinal wrinkles on the straight edge of the head should not be greater than 0.25%D. 8.6.5 The limit deviation of dimensions without tolerance shall comply with the provisions of GB/T 1804.The specific requirements are as follows. a) Machined parts shall not be lower than grade M; b) Non-machined parts shall not be lower than grade C; c) The length dimension is not less than level v. 8.7 Assembly 8.7.1 The gas cylinder body should be visually inspected before assembly. 8.7.2 The misalignment (b) of the butt weld between the upper and lower heads or the head and the shell shall not exceed 0.25S0; the angular height (E) shall not exceed 0.1S0 2mm; the length of the inspection ruler is not less than 300mm. 8.7.3 The assembly of accessories shall comply with the requirements of the drawings. 8.8 Heat treatment 8.8.1 After all welding of the cylinder body and its auxiliary structural parts is completed, the cylinder shall be subjected to overall heat treatment. The heat treatment device shall ensure effective heating. The temperature distribution of the effective heating zone should not exceed the set temperature ±25℃, and the temperature, time and number of gas cylinders should be automatically recorded. There should be no less than 3 temperature measurement points in the furnace, and the temperature change trend of the temperature field in the entire effective heating area should be reflected. The weld should be heat treated again after repair. 8.8.2 The heat treatment process assessment shall be carried out in accordance with the provisions of CJ/T 33; the number of cylinders for each heat treatment process assessment plan shall not be less than There are 4 of them, 2 of which are used for mechanical property test and the other 2 are used for water pressure bursting test. 8.8.3 Changes in the material grade or thickness of the main body, the structure of the gas cylinder, the welding process, the heat treatment equipment, the heat treatment The heat treatment process should be re-evaluated. Gas cylinders with the same size, structure and plate thickness specifications, the same welding and the same heat treatment specifications, after the heat treatment process is qualified, shall be No assessment is allowed during subsequent production processes.9 Test methods and inspection rules9.1 Radiographic testing of welds 9.1.1 Welds should be tested non-destructively by radiography (RT) or digital radiography (DR). 9.1.2 Non-destructive testing shall be carried out in accordance with the provisions of NB/T 47013.2 or GB/T 17925. 9.1.3 For gas cylinders with only one girth weld, one cylinder shall be randomly selected from every 250 cylinders produced in the order of production (if there are less than 250 cylinders, one cylinder shall also be randomly selected). 1), conduct 100% radiographic inspection on the girth weld. If it fails, another 2 pieces shall be sampled for inspection. If there is still 1 piece that fails, then each piece shall be inspected. Detection. 9.1.4 For cylinders with longitudinal and circumferential welds, 20% of the total length of the longitudinal and circumferential welds of the cylinders shall be radiographically inspected, including the longitudinal and circumferential welds. The overlap of the weld. 9.1.5 After the weld is radiographically inspected, it shall be assessed in accordance with NB/T 47013.2 or GB/T 17925.The quality of the radiographic film or image shall be The quality is grade AB, and the weld defect grade is not less than grade II to be qualified. 9.1.6 The quality of welds that have not been radiographically inspected shall comply with the requirements of 9.1.5. 9.2 Inspection of each item 9.2.1 General inspection 9.2.1.1 Use a depth gauge to inspect the surface of the gas cylinder. There should be no concave defects with a depth exceeding 0.5 mm and no defects with a depth exceeding Scratches, corrosion and defects exceeding 0.3mm. 9.2.1.2 Use a ruler and vernier caliper to inspect butt welds. The weld dimensions should comply with the requirements of 8.3.2. 9.2.1.3 Check the accessories of gas cylinders one by one. The selected accessories should comply with the requirements of 7.3. 9.2.1.4 Use a flashlight to illuminate the inside of the gas cylinder. The inside of the gas cylinder should be dry and clean. 9.2.2 Water pressure test 9.2.2.1 The hydraulic pressure test is carried out after the heat treatment process is completed. The hydraulic pressure test is carried out in accordance with the provisions of GB/T 9251.The hydraulic pressure test device should be able to The bottle number, test time and test results shall be automatically recorded, and the electronic files of water pressure test records shall be kept for at least 8 years. 9.2.2.2 During the water pressure test, the pressure should be slowly increased to 3.2 MPa at a rate not exceeding 0.5 MPa per second and maintained for not less than 30 seconds. There should be no macro deformation and leakage, and the pressure gauge should not have any visible drop. 9.2.2.3 The on-site or video inspection confirmation documents for the hydrostatic test of each gas cylinder should be kept for at least 8 years. 9.2.3 Air tightness test 9.2.3.1 The gas cylinder air tightness test shall be carried out in accordance with the provisions of GB/T......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 5842-2023_English be delivered?Answer: Upon your order, we will start to translate GB 5842-2023_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 6 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB 5842-2023_English with my colleagues?Answer: Yes. 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