Some standard content:
GB15380—2001
This standard is revised and compiled on the basis of GB15380--1994 "Small Volume Liquefied Petroleum Gas Cylinders". This standard replaces GB15380---1994.
The main revisions to this standard are as follows: Due to the release and implementation of GB11174 "Liquefied Petroleum Gas", small volume liquefied petroleum gas cylinders that contain liquefied petroleum gas must also adapt to it. Therefore, the test pressure is changed from 2.4MPa to 3.2MPa, and the airtightness test pressure is changed from 1.6MPa to 2.1MPa; Due to the release and implementation of JB4730 "Nondestructive Testing of Pressure Vessels" and JB4708 "Welding Procedure Assessment of Steel Pressure Vessels", JB4730 and JB4708 are used as reference standards of this standard; for the same reason, GB6653 "Steel Plate for Welded Gas Cylinders" is used as the reference standard of this standard; the verification analysis results of the chemical composition of the main material are modified. Appendix A and Appendix B of this standard are the appendices of the standard. This standard is proposed by the State Administration of Quality and Technical Supervision. This standard is under the jurisdiction of the National Technical Committee for Standardization of Gas Cylinders. The drafting unit of this standard: Liquefied Petroleum Gas Cylinder Subcommittee of the National Technical Committee for Standardization of Gas Cylinders. The main drafter of this standard: Wang Bing.
1 Scope
National Standard of the People's Republic of China
Small Volume Liquefied Petroleum Gas Cylinders
Liquefied petroleun gas steel mini-cylindersGB 15380—2001
Replaces GB15380—1994
This standard specifies the types and parameters, technical requirements, test methods, inspection rules, marking, coating, packaging, transportation and storage of small volume liquefied petroleum gas cylinders.
This standard applies to steel welded gas cylinders (hereinafter referred to as cylinders) with a test pressure of 3.2MPa and a nominal volume of 1.2~12L that can be refilled with liquefied petroleum gas under normal ambient temperature (-40℃~~60℃). This standard does not apply to liquefied petroleum gas cylinders used in aviation, railway transportation, and automobiles. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T228—1987Methods for tensile testing of metals
Tensile testing method for welded joints
GB/T 2651—1989
Bending and flattening testing method for welded joints
GB/T 2653-1989
GB 6653 ---1994
Steel plates for welded gas cylinders
GB 7144—1999
GB 8335---1998
Color marking of gas cylinders
Special thread for gas cylinders
GB/T 9251—1997
GB 11174--1997
Hydraulic pressure testing method for gas cylinders
Liquefied petroleum gas
Gas cylinder airtightness testing method
GB/T 12137--1989
GB/T 13005—-1991
GB 15385—1994
JB 4708—2000
JB4730—1994
3 Symbols
Terminology for gas cylinders
Test method for hydraulic bursting of gas cylinders
Welding procedure assessment for steel pressure vessels
Non-destructive testing of pressure vessels
b Misalignment of weld ends, mm;
D; Inner diameter of steel cylinder, mm;
D,, Outer diameter of steel cylinder, mm;
E Height of butt weld corners, mm;
e Difference between the maximum and minimum diameters of the same cross section of the cylinder, mm; H Height of cylinder body, mm. Refers to the distance between the convex end points of the two heads; Pe Burst pressure of cylinder, MPa;
Approved by the State Administration of Quality and Technical Supervision on 2001-01-10 318
Implementation on 2001-10-01
P, hydraulic test pressure of cylinder, MPa;
GB 15380--2001
S Nominal wall thickness of cylinder body, mm (including the curved surface part and the cylindrical part of the head); S. Calculated wall thickness of steel cylinder body, mm (including the curved surface of the head and the cylindrical part); So Calculated wall thickness of steel cylinder body, mm (including the curved surface of the head and the cylindrical part); ab Tensile strength MPa;
Oba Actual tensile strength value, MPa;
o. Service point, MPa;
95 Elongation of test specimen, %;
Medium weld coefficient;
AH Total height tolerance of head, mm.
4 Specifications and types of steel cylinders
Specifications of steel cylinders (see Table 1)
4.2 Type
Nominal volume
Weight of filled liquefied petroleum gas
H/D.
0. 8~1. 2
Outer diameter of shield
2/3D. ±5
2/3D. ±5
2/3D. ±5
Base outer diameter
4/5D. ±5
4/5D±5
4/5D±5
It consists of a bottle body, a base and a bottle valve shield formed by two elliptical heads. A circumferential weld is on the cross section in the middle of the bottle body. 5 Materials
5.1 General provisions
5.1.1 The main material of the cylinder must be killed steel smelted in an electric furnace or oxygen converter, with good stamping and welding properties and should comply with the provisions of GB6653. When using steel strips, they must be finished. Ordinary steel is not allowed. 5.1.2 All parts welded to the main body of the cylinder must be made of materials that are compatible with the weldability of the main material. 5.1.3 The tensile strength of the welds made of the welding materials used shall not be lower than the lower limit of the specified value of the tensile strength of the parent material. 5.1.4 Materials (including welding materials) shall comply with the provisions of the relevant standards and must have a quality certificate. 5.1.5 The chemical composition of the main material must be verified according to the furnace and tank number, and the mechanical properties must be verified according to the batch number. The verified qualified materials should have material markings. The verification results should be consistent with the quality certificate. 5.2 Chemical composition
The verification analysis results of the chemical composition of the main material of the cylinder shall meet the following ranges: Carbon
Not more than
Not more than
Not more than
0. 13% ~0. 18%
0. 80% ~1. 50%
5.3 Mechanical properties
5.3.1 The yield point as of the main material of the cylinder shall not be greater than 0.8 times its tensile strength. The elongation 5 of the test specimen of the main material of the steel cylinder shall not be less than 22%. 5.3.2
6 Design
6.1 General provisions
GB15380—2001
6.1.1 The steel cylinder body consists of two upper and lower heads, with only one circumferential weld. 6.1.2 The steel cylinder shield, base and cylinder body are welded. 6.1.3 The design of the wall thickness of the steel cylinder body shall use the yield point s as the strength parameter of the material. 6.2 The calculated wall thickness of the cylinder body is calculated according to formula (1): Soo
Where: The yield point of the material: The minimum value specified in the standard should be selected, and the weld coefficient is 0.9.
6.3 The nominal wall thickness of the cylinder body shall also take into account the negative deviation of the steel plate thickness and the process thinning amount. (1)
6.4 If the thickness calculated according to Article 6.2 is less than 2mm, the minimum wall thickness of a steel cylinder with a nominal volume less than 5L shall not be less than 1.5mm, and the minimum wall thickness of a steel cylinder with a nominal volume greater than 5L shall not be less than 2mm. 6.5 The upper and lower heads shall be assembled by shrinking and plug-in type. 6.6 Spare parts
6.6.1 The design of spare parts shall facilitate the inspection of welds. 6.6.2 The structural shape of spare parts and their connection with the bottle body shall prevent liquid accumulation. 6.6.3 The cylinder shall be equipped with a shield to protect the bottle valve. The thickness of the shield shall be equal to the thickness of the bottle body. 6.6.4 The sealing material of the cylinder shall not react chemically with the liquefied petroleum gas contained therein. 6.6.5 The thread of the bottle mouth shall comply with the provisions of GB8335. 7 Manufacturing
7.1 Welding process assessment
7.1.1 Before the formal production of steel cylinders or during the production process, when changing materials (including welding materials), welding processes or welding equipment, welding process assessment should be carried out in accordance with JB4708. 7.1.2 The welders and non-destructive testing personnel who carry out welding process assessment should meet the requirements of Articles 7.2.1 and 8.1.1 respectively. 7.1.3 The welding process assessment is carried out on the cylinder body. 7.1.4 Evaluation of welding procedure test plate:
a) The welding procedure test plate shall be subjected to visual inspection and radiographic inspection, and the inspection results shall comply with the provisions of Articles 7.3.3 and 8.1; b) The welded joint shall be subjected to tension and bending tests. Number of specimens: 2 pieces for tension, 4 pieces for transverse bending (2 pieces each for positive and negative bending), the test method and qualification standard shall comply with the requirements of Articles 8.3.3.4 and 8.3.3.5.
7.1.5 The results of welding procedure evaluation shall be reviewed and approved by the technical director of the manufacturer and stored in the factory technical files. 7.2 General provisions for welding
7.2.1 The welding of steel cylinders must be undertaken by welders who have passed the examination in accordance with the "Test Rules for Boiler and Pressure Vessel Welders" and hold valid certificates. The welder code shall be marked at the appropriate position of the steel cylinder. 7.2.2 The welding of the main welds of the steel cylinder must strictly comply with the qualified welding process. 7.2.3 The welding of the main weld of the cylinder shall be carried out by automatic welding. 7.2.4 The shape and size of the welding groove shall comply with the requirements of the drawing. The groove surface shall be clean and smooth, and shall not have defects such as cracks, delamination and slag inclusions.
7.2.5 Welding shall be carried out indoors, and the relative humidity shall not be greater than 90%, otherwise effective measures shall be taken. When the temperature of the weld is lower than 0℃, 320
shall be preheated at the start of welding.
7.2.6 When welding, the arc shall not be struck at non-welding locations. 7.3 Weld
GB15380—2001
7.3.1 The residual height of the circumferential weld of the cylinder body is 0~2mm; the difference between the widest and narrowest parts shall not be greater than 2mm. 7.3.2 When there is no provision in the drawing, the height of the weld leg of the fillet weld shall not be less than the thickness of the thinner one of the welded parts, and its geometric shape shall smoothly transition to the parent surface.
7.3.3 The appearance of the weld surface shall comply with the following provisions: a) The weld and heat-affected zone shall not have defects such as cracks, pores, arc pits, slag inclusions and unfused parts; b) The circumferential weld shall not be allowed to undercut, and the welds of the parts welded to the bottle body shall not be allowed to undercut on the bottle body side; c) The weld surface shall not have depressions or irregular mutations; d) The spatter on both sides of the weld must be cleaned up. 7.4 Weld repair is not allowed. wwW.bzxz.Net
7.5 The head shall be made of a whole piece of steel plate.
7.6 The maximum and minimum diameter difference of the head shall not be greater than 1.5mm. 7.7 The total height tolerance of the head △Htmm.
7.8 The longitudinal wrinkle depth of the head shall not be greater than 0.20%D. . 7.9 Assembly
7.9.1 The upper and lower heads shall be visually inspected before assembly, and those that fail to meet the requirements shall not be assembled. The misalignment of the upper and lower heads shall not exceed 0.20S; the height of the corners E shall not exceed 0.1S+1.5mm; the length of the inspection ruler used shall not be less than 200mm.
7.9.3 The assembly of spare parts shall comply with the requirements of the drawings. 7.10 Heat treatment
7.10.1 After all welding is completed, the cylinder shall be subjected to overall normalizing or stress relief heat treatment. Local heat treatment is not allowed. 7.10.2 When heat treating the cylinder, there must be an approved heat treatment process and it must be strictly implemented. 7.10.3 The heat treatment method shall be recorded in the product certificate. 8 Inspection rules and test methods
8.1 Radiographic inspection
8.1.1 The non-destructive inspection personnel of the cylinder shall pass the examination and hold a valid certificate. 8.1.2 One piece shall be sampled for every 50 pieces (or one piece shall be sampled if there are less than 50 pieces) in the production sequence, and the circumferential weld shall be subjected to 100% radiographic inspection. If unqualified, two more pieces shall be sampled for inspection. If one piece is still unqualified, each piece shall be inspected. 8.1.3 The results of the radiographic inspection of the weld shall be evaluated in accordance with JB4730, and the grade shall be qualified. 8.1.4 The quality of welds that have not been radiographically inspected must also be guaranteed to comply with the provisions of Article 8.1.3. 8.2 Inspection of each piece
8.2.1 Appearance inspection
The surface of the cylinder shall be smooth, and shall not have defects such as cracks, heavy skin, slag inclusions, and pits with a depth exceeding 0.5mm. 8.2.1. 1
8.2.1.2 The appearance of the weld shall comply with the provisions of Article 7.3.3. 8.2.1.3 The spare parts of the cylinder shall comply with the requirements of Articles 6.6 and 7.9.3. 8.2.1.4 The inside of the cylinder should be dry and clean.
8.2.2 Water pressure test
8.2.2.1 The water pressure test shall be carried out in accordance with GB/T9251. Two pressure gauges with the same range and accuracy not less than Class 1.5 shall be used for pressure measurement. The range of the pressure gauge is 4.0MPa. The inspection period of the pressure gauge shall not exceed three months. 8.2.2.2 The test environment temperature and the test water temperature shall not be lower than 5℃. 321
GB 15380--2001
8.2.2.3 During the test, the pressure shall be slowly increased to the test pressure at a pressure increase rate of no more than 0.5MPa per second and maintained for 1min. The cylinder shall be checked for macroscopic deformation and leakage, and the pressure gauge shall not have a drop phenomenon. If the flow rate of the pressure test pump is too large, flow limiting measures shall be taken. 8.2.2.4 The same cylinder shall not be subjected to continuous pressure tests. 8.2.3 Steam Tightness Test
8.2.3.1 After the cylinder passes the water pressure test, the gas tightness test shall be carried out. The gas tightness test shall be carried out in accordance with the provisions of GB/T12137, and the test pressure shall be 2.1 MPa.
8.2.3.2 During the test, the pressure shall be increased slowly. After reaching the test pressure, the pressure shall be kept constant. Check that there is no leakage in the cylinder. 8.2.3.3 Effective protective measures shall be taken during the gas tightness test to ensure the safety of the operator. 8.2.4 The weight and water volume of each cylinder shall be measured, and the volume shall not be less than the nominal volume. 8.3 Batch Inspection
8.3.1 Batch Inspection
Batch Inspection of cylinders of the same specification continuously produced with the same grade of material, the same welding process and the same heat treatment process. 8.3.2 A batch of no more than 202 cylinders shall be selected from each batch of cylinders for mechanical properties test and water pressure burst test. 8.3.3 Mechanical properties test
8.3.3.1 Sampling requirements: A parent material tensile test specimen shall be cut from the convex part of the cylinder head. One tensile test specimen, one transverse positive bend test specimen and one reverse bend test specimen of the welded joint shall be cut from the girth weld.
8.3.3.2 The front and back sides of the weld on the specimen shall be machined to be flush with the plate surface. For specimens that are not flat enough, cold pressing can be used to correct them
8.3.3.3 The weld cross section of the specimen shall be good and shall not have defects such as cracks, lack of fusion, lack of penetration, slag inclusions and pores. 8.3.3.4 Tensile test
8.3.3.4.1 The parent material tensile test of the cylinder shall be carried out in accordance with GB/T228. The test result requirements are as follows: a) The actual tensile strength measured value a shall not be lower than the lower limit specified in the parent material standard; b) The elongation 05 of the specimen shall meet the requirements of Article 5.3.2. 8.3.3.4.2 The tensile test of the welded joint of the steel cylinder shall be carried out in accordance with GB/T2651. A shoulder plate-shaped specimen is used. The test results show that the tensile strength shall not be lower than the lower limit specified in the parent material standard. 8.3.3.5 The bending test of the welded joint of the steel cylinder shall be carried out in accordance with GB/T2653. There shall be no cracks when the bending is equal to or greater than 100°, but the early cracking of the edge of the specimen shall not be counted.
8.3.4 Water pressure bursting test
8.3.4.1 The water pressure bursting test shall be carried out in accordance with GB15385. The following data should be measured: a) water volume of the cylinder;
b) volume deformation of the cylinder under the water pressure test pressure; c) internal pressure of the cylinder when it reaches the yield point; d) pressure P and volume deformation rate when the cylinder ruptures. 8.3.4.2 When conducting a water pressure burst test, the water delivery rate of the water pump per hour should be 1 to 2 times the volume of the cylinder. 8.3.4.3 Before conducting a water pressure burst test, the weight of the empty cylinder should be weighed first; after filling with water, the total weight of the cylinder and water should be weighed, so as to calculate the water volume of the cylinder.
8.3.4.4 When conducting a water pressure burst test, the pressure should be increased slowly, first to 2.1MPa, then the pressure should be released, and this should be repeated several times to discharge the gas in the water. After the gas is exhausted, the pressure should be increased to the water pressure test pressure Ph, and after maintaining it for at least 30s, the total volume deformation of the cylinder should be measured. Then increase the pressure to measure and record the pressure, time and water inflow, so as to draw the pressure-time and pressure-water inflow curves, determine the pressure at which the cylinder begins to yield, until it bursts and determines the bursting pressure and total water inflow. 8.3.4.5 The measured bursting pressure P should not be less than the result calculated by formula (2): 2S.o
P,≥ D.-S
.( 2 )
GB15380--2001
8.3.4.6 The volume deformation rate when the cylinder ruptures (the ratio of the volume increase of the cylinder during the burst to the actual volume of the cylinder before the test) should be greater than 10%.
8.3.4.7 If the cylinder breaks and forms fragments or the fracture occurs on the valve seat fillet weld or girth weld (except for those perpendicular to the girth weld), the test is considered unqualified.
9 Marking, coating, packaging, transportation, storage 9.1 Marking
9.1.1 The arrangement and content of the markings on the cylinder shall comply with the provisions of the "Regulations on Safety Supervision of Gas Cylinders". 9.1.2 The steel stamp mark shall be obvious and clear and shall be stamped on the shield or the head. The mark on the cylinder shall be permanent and the nameplate shall not be used to replace the cylinder mark.
9.2 Coating
9.2.1 The cylinder shall be coated only after the surface of the cylinder has been cleaned of oil, rust, oxide scale, welding spatter and other debris after passing the inspection and keeping it dry.
9.2.2 The red words "liquefied petroleum gas" shall be written in Fangsong Chinese characters. The paint color of the cylinder shall comply with the provisions of GB7144. 9.2.3 The coating should be uniform and should not have defects such as bubbles, flow marks, cracks and peeling. 9.3 Packaging
9.3.1 The valve mouth of the cylinder should be properly sealed to prevent the entry of debris or harmful media during transportation and storage. 9.3.2 Cylinders leaving the factory should be packaged to avoid damage. 9.4 Cylinders should be protected from collision and scratches during transportation, loading and unloading. 9.5 Cylinders should be stored in a place without corrosive gases, ventilated, dry, and not exposed to sunlight. 10 Product Certificate and Quality Certificate
10.1 Each cylinder should have a certificate when leaving the factory. The format of the certificate is shown in Appendix A (Appendix to the standard). 10.2 Each batch of cylinders leaving the factory should have a quality certificate. The format is shown in Appendix B (Appendix to the standard). 323
Cylinder Model
Factory Number
Factory Batch Number
Factory Date
Manufacturing License Number
GB15380-2001
Appendix A
(Appendix to the Subject)
Product Certificate Format
××x×x×x Factory
Small Volume Liquefied Petroleum Gas Cylinder
Product Certificate
This product is manufactured in accordance with the requirements of GB15380-2001 and the design drawings and has passed the inspection. Inspection Section Chief (Seal)
Note: The specifications must be unified, and the core size is 100mmX75mm. 324
Special seal for quality inspection
Filling medium
Maximum filling volume
Bottle material
Bottle design thickness
Test pressure
Airtightness test pressure
Heat treatment method
Welder code
Inspector's signature
GB 15380—2001
Instructions for use of steel cylinders:
(Compiled by the manufacturer)
GB 15380 --2001
Cylinder model
Filling medium
Factory batch number
Date of issue
Manufacturing license number
This batch of cylinders
GB15380—2001
Appendix B
(Standard appendix)
Quality certificate format
XXXXXXX Factory
Small volume liquefied petroleum gas cylinder
Batch inspection quality certificate
After inspection, it complies with GB15380-2001 and is a qualified product. Special seal for supervision and inspection
Supervisor
Year, month, day
Manufacturer address:
Note: The specifications must be unified, and the core size is 100mm×75mm. Special seal for inspection of the manufacturer
Inspection section chief
1. Main technical data
Nominal volume
Inner diameter
Thickness specified in the drawing
2. Measurement of test bottle
Test bottle number
3. Chemical composition of main material, %
(Standard code)
Standard specified value
Welding material
Welding wire brand
GB15380-2001
Nominal working pressure
Test pressure
Air tightness test pressure
Welding wire diameter, mm
Minimum actual measurement
Heat treatment method
Flux brand
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