Some standard content:
National Standard of the People's Republic of China
Steel welded
Welded steel gas cylinders
GB 5100
Replaces GB5100-85
This standard adopts the international standard ISO4706:1989 "Refillable steel welded gas cylinders" for steel welded gas cylinders with a water volume not exceeding 150L in a non-equivalent manner.
1 Subject content and scope of application
This standard specifies the basic parameters, technical requirements, test methods, inspection rules and markings, packaging, transportation, storage, etc. of steel welded gas cylinders (hereinafter referred to as steel cylinders).
This standard applies to steel cylinders that are used at normal ambient temperature (-40～60℃), have a water pressure test pressure of no more than 7.5MPa (gauge pressure), and a nominal volume of 10~～1000L and can be repeatedly filled with low-pressure liquefied gas or dissolved gas. This standard also applies to steel cylinders that are repeatedly filled with industrial liquefied petroleum gas specified in GB11174. 2
Cited standards
Metal tensile test method
2·Metal bending test method
GB 1804
GB2106
GB 4159
GB6397
GB 7144
GB8335
GB8337
GB9251
GB 11174
Tolerances and fitsLimit deviations for dimensions without tolerancesMethod for Charpy (V-notch) impact test of metalMethod for Charpy impact test of metal at low temperature
Metal tensile test specimens
Color marking of gas cylinders
Special threads for gas cylinders
Fusible alloy plugs for gas cylinders
Hydrostatic test method for gas cylinders
Liquid petroleum gas
GB12137
Gas cylinder airtightness test method
GB/T 13005
GB15385
Terms for gas cylinders
Test methods for hydraulic bursting of gas cylinders
Nondestructive testing of pressure vessels
JB4730
3 Terms and symbols
3.1 Terms
Batch: refers to the limited number of cylinders produced continuously with the same design, the same grade of material, the same welding process, and the same heat treatment process.
3.2 Symbols
Gap between the curved surface of the head and the sample, mm;||t t||Approved by the State Administration of Technical Supervision on December 26, 1994 and implemented on August 1, 1995
Impact absorption energy, J;
Weld joint misalignment, mm;
Surface concave and convex of the head, mm;
Nominal diameter of the cylinder, mm;
d—diameter of the bending axis of the bending test, mm; D),—inner diameter of the cylinder, mm;
\—outer diameter of the cylinder, mm;
Height of the angularity of the butt weld, mm;
GB 5100--94
Difference between the maximum and minimum diameters of the same cross section of the cylinder body, mm;Height of the straight edge of the head, mm;
Height of the inner convex surface of the head, mm;
Head shape coefficient;
Bottle body length (including the height of the heads at both ends), mm;Sample length, mm;
Ratio of the bending axis diameter to the specimen thickness;
P. Nominal working pressure, MPa;
Measured bursting pressure of the cylinder, MPa;
Hydraulic pressure test pressure, MPa;
Inner radius of the corner of the transition zone of the head, mm;
Inner radius of the spherical part of the head, mm;
Design wall thickness of the bottle body, mm;
Bottle body Design wall thickness, mm;
Design wall thickness of the head, mm;
Minimum measured wall thickness of the bottle body, mm;
Weld width of tensile test specimen, mm;
Thickness of test specimen, mm;
Nominal wall thickness of the bottle body, mm;
Nominal volume, L;
Tensile strength specified in the standard, MPa;
Measured tensile strength, MPa;
Yield stress or yield point of material at room temperature, MPa; AHi-
Tolerance of inner height of head (Ht+h), mm;
s-.Elongation of short test specimen, %;
——Weld coefficient;
AD—Tolerance of inner circumference, mm.
4 Basic parameters
4.1 Nominal volume and nominal diameter
The nominal volume V and nominal diameter D of steel cylinders shall be as specified in Table 1. 178
Nominal volume V
Nominal diameter D
200,230
Note: The values in () should not be used as much as possible. >25～50
250,300
4.2 Nominal working pressure and water pressure test pressure GB 5100—94
>50～100
300,350
The nominal working pressure and water pressure test pressure of steel cylinders shall be as specified in Table 2. >100～150
Media name
Nominal working pressure P
Hydraulic pressure test pressure Ph
4.3 Allowable pressure
Low-pressure liquefied gas
The allowable pressure of the cylinder shall not exceed 0.8 times the hydraulic pressure test pressure. 5 Technical requirements
5.1 General provisions for materials
≥150～200
Dissolved acetylene gas
>200～600>6001000
Industrial liquefied petroleum gas
5.1.1 The body material of the cylinder must be killed steel smelted in an open hearth, electric furnace or oxygen-blown converter, and have good forming and welding properties. All parts welded to the cylinder body must be made of materials that are compatible with the properties of the cylinder body material. 5.1.22
The tensile strength of the weld welded by the welding materials used in 5.1.3 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 technical standards and must have a quality certificate. 5.1.5 The cylinder manufacturing unit must conduct finished product chemical composition verification analysis according to the furnace number and mechanical property verification test according to the batch number for the materials used to manufacture the main body of the cylinder. Materials that have passed the test shall be marked. 5.2 Chemical composition
The chemical composition (melting analysis) of the main body material of the cylinder shall comply with the provisions of Table 3. For steel materials containing trace alloying elements, the content shall comply with the provisions of Table 4.
Chemical elements
Not more than
0.45(0.60)
Note: Materials with chemical composition in () are suitable for manufacturing cylinder materials with V>150L. Table 4
Trace alloy elements
Not more than
5.3 Mechanical properties
5.3.1 When the nominal wall thickness of the cylinder body S.≥6mm, the room temperature impact absorption energy Ak of its main material shall comply with the requirements of Table 5. %
Nominal wall thickness of bottle body S.,mm
GB5100-94
Specimen specifications, mm
5×10×55
10×10×55
Test temperature, ℃
Impact absorption energy Ak shall not be less than,
5.3.2 When the nominal wall thickness S of the cylinder body is ≥6mm and it is used in an ambient temperature below -20℃, if at the operating temperature, the primary tensile film stress calculated according to the pressure inside the cylinder is greater than 1/6 of the standard yield point of the material at room temperature, the bottle body material shall be subjected to a 40℃ Charpy V-notch impact test, and its impact absorption energy Ak shall comply with the requirements of Table 5. 5.3.3 The yield strength ratio (o./a) of the cylinder body material shall not be greater than 0.8. 5.4 General design provisions
5.4.1 The internal pressure for calculating the wall thickness of the cylinder body is the water pressure test pressure. 5.4.2 The cylinder body shall consist of no more than three parts, that is, no more than one longitudinal weld and no more than two circumferential welds. 5.4.3 The shape of the cylinder head shall be elliptical (see Figure 1a), dish-shaped (see Figure 1b) or hemispherical. The straight edge height h of the head shall be specified as follows: a.
When the nominal wall thickness S.≤8mm, the straight edge height h≥25mm; when the nominal wall thickness Sh8mm, the straight edge height h≥40mm. s
5.5 Calculation of cylinder wall thickness
5.5.1 The design wall thickness S of the cylinder shall be calculated according to formula (1) and rounded up to one decimal place. S
In the formula, the weld coefficient is specified as follows:
$=1, each butt weld is 100% radiographically inspected; PD
Φ=0.9, the weld radiographic inspection requirements are in accordance with the provisions of 5.13.2. 5.5.2 The design wall thickness S2 of the head is calculated according to formula (2) and rounded up to one decimal place. S,
20g-Ph
R& D, ro0.1D.
营营业务
In the formula, the head shape coefficient K, for the standard elliptical head (H; 0.25D), K=1, and other heads can be found in Figure 2. 180
(2)
GB 5100-94
Applicable to the ratio H,/D, between 0.20 and 0.25a
Applicable to the ratio H/D, between 0.25 and 0.50b
5.5.3 The design wall thickness S of the cylinder body shall comply with the following provisions:a.
When the inner diameter D of the cylinder is less than 250 mm, it shall not be less than 2 mm; 0. 25 H,/D,
When the inner diameter D of the cylinder is ≥250 mm, it shall not be less than the thickness calculated according to formula (3). b.
.....(3)
GB 5100—94
5.5.4 The nominal wall thickness of the cylinder body and the head should be equal. When determining the nominal thickness of the cylinder body, the corrosion allowance, the negative deviation of the steel plate thickness and the process thinning amount should be considered.
5.6 Openings
5.6.1 Openings on the cylinder body are not allowed. When opening holes on the head, the stress concentration points should be avoided. 5.6.2 Reinforcement should be considered for all openings. The reinforcement should adopt equal strength reinforcement methods. The reinforcement materials should be compatible with the cylinder body material and have good welding properties.
5.7 Welded joints
5.7.1 The welded joints of the main welds should adopt the full penetration butt type. 5.7.2 The longitudinal welds shall not have permanent pads. 5.7.3 Permanent pads are allowed for circumferential welds, or integral pads with stepped shapes on one side of the joints. 5.8 Accessories
5.8.1 The structural design and layout of accessories should facilitate operation and weld inspection. The connecting welds between accessories and the bottle body should avoid the longitudinal and circumferential welds of the bottle body. The structural shape of the accessories and their connection with the bottle body should prevent liquid accumulation. 5.8.2 The base should ensure the stability of the cylinder when it is upright and have holes for drainage and ventilation. 5.8.3 When the total weight of the cylinder filled with medium exceeds 40kg, hoisting accessories or hoisting holes should be considered. 5.8.4 The selected bottle valve should meet the requirements of the medium contained. The bottle valve thread must match the bottle mouth thread and comply with relevant standards. 5.8.5 The cylinder should be equipped with a fixed bottle cap or shield. 5.8.6 The sealing materials used for the cylinder and its accessories shall not react chemically with the medium contained. 5.8.7 When the cylinder is equipped with a safety discharge device, its fusible alloy shall not react chemically with the medium in the bottle, nor affect the quality of the filled medium.
5.8.8 For steel cylinders containing extremely or highly toxic media (such as phosgene, hydrogen fluoride, chlorine, etc.), discharge devices shall not be used. 5.9 Batching
The steel cylinder manufacturing unit must organize production in batches according to relevant regulations. 5.10 Welding process evaluation
5.10.1 Before producing steel cylinders, or when it is necessary to change the cylinder material, welding material, welding process, or welding equipment, the steel cylinder manufacturing unit shall conduct welding process evaluation.
5.10.2 The welding process evaluation can be conducted on the welding evaluation test plate or directly on the steel cylinder. The welds for process evaluation should represent the main welds of the steel cylinder (longitudinal welds, girth welds). 5.10.3 The welding process evaluation test plate should be subjected to visual inspection and 100% radiographic inspection, and the inspection results should comply with the provisions of Articles 5.12 and 5.13.
5.10.4 The welded joints shall be subjected to tensile and bending tests. When the nominal wall thickness of the cylinder body S.≥6mm, a normal temperature impact test shall also be conducted. When the steel cylinder is used in accordance with Article 5.3.2, a 40℃ low temperature impact test shall be conducted instead. 5.10.5 The requirements for the welding process qualification test results are as follows: a. The tensile strength of the welded joint shall comply with Article 5.23; b. The impact test results shall comply with the provisions of Table 5 of Article 5.3. The test result refers to the arithmetic mean of the three specimens, and one of the specimens is allowed to be 1/6 lower than the specified qualified value;
c. There shall be no cracks when the specimen is bent to 100°, and the early cracking of the specimen edge can be ignored. 5.10.6 The welding process qualification document shall be approved by the chief technical officer of the steel cylinder manufacturing unit. 5.11 General provisions for welding
5.11.1 The welding of steel cylinders must be undertaken by welders who have passed the "Testing Rules for Boiler and Pressure Vessel Welders" issued by the Ministry of Labor and hold valid certificates. After welding, the welder shall stamp the welder's stamp at an appropriate position near the weld. And there shall be traceable records. When there are special requirements, it can be carried out according to the drawing.
5.11.2 The welding of the main weld of the steel cylinder must adopt the automatic welding method and strictly abide by the welding process that has been evaluated and qualified. 182
GB 5100-94
5.11.3 The shape and size of the welding groove shall comply with the drawing regulations. The groove surface shall be clean and smooth, and shall not have defects such as cracks, delamination and inclusions.
5.11.4 Welding (including weld repair) shall be carried out indoors, and the relative humidity in the room shall not be greater than 90%, otherwise measures shall be taken. When the temperature of the welded part is lower than 0C, the part where welding starts should be preheated. 5.11.5 When welding, arc should not be struck at non-welding locations. The longitudinal weld should have arc initiation plates and arc extinguishing plates, and the length of the plates should not be less than 100mm. When removing the arc initiation and arc extinguishing plates, the cutting method should be adopted, and the knocking method is strictly prohibited. The cut-off part should be flat. 5.12 Appearance of welds
5.12.1 The excess height of the bottle body butt weld is 0~3.5mm, and the difference between the widest and narrowest parts of the weld is not more than 4mm. 5.12.2 The geometric shape of the fillet welds of the valve seat and plug seat should smoothly transition to the surface of the parent material. 5.12.3 The welds on the bottle body are not allowed to undercut, and there should be no cracks, pores, arc pits, depressions and irregular mutations on the surface of the weld and the heat-affected zone. The spatter on both sides of the weld must be cleaned up. 5.13 Radiographic inspection of welds
5.13.1 Personnel engaged in radiographic inspection of steel cylinder welds must pass the examination in accordance with the "Qualification Assessment Rules for Boiler and Pressure Vessel Nondestructive Inspection Personnel" issued by the Ministry of Labor and hold a valid certificate. 5.13.2 For steel cylinders designed with a weld coefficient of 1, 100% radiographic inspection must be carried out on the longitudinal and circumferential welds of each steel cylinder. For steel cylinders designed with a weld coefficient of $-0.9, for cylinders with only one circumferential weld, one cylinder shall be selected for every 50 cylinders in the production sequence (if there are less than 50 cylinders, one cylinder shall also be selected for radiographic inspection of the entire length of the weld; for cylinders with one longitudinal weld and two circumferential welds, each cylinder's longitudinal and circumferential welds must be inspected for no less than 20% of the length of the weld. 5.13.3 The areas to be radiographically inspected shall include the junction of the longitudinal and circumferential welds. 5.1 3.4 The radiographic inspection of welds shall be carried out in accordance with JB4730, the quality of the radiographic film shall be AB grade, and the weld defect grade shall not be less than grade 1. 5.13.5 The quality of the butt weld of the bottle body that has not been radiographically inspected shall also meet the requirements of Article 5.13.4. If the defect is only the excessive pores, it can be handled by negotiation between the cylinder manufacturer and the user. 5.14 Weld repair
5.14.1 Weld repair shall be carried out according to the repair process. Repair part The appearance and radiographic inspection shall be conducted again in accordance with 5.12 and 5.13.4.
5.14.2 The number of times the same part of the weld is repaired shall not exceed two times. If it exceeds this limit, each repair shall be approved by the chief technical officer. 5.14.3 The number of repairs and the repaired parts shall be recorded in the product production inspection record and indicated in the product certificate. 5.15 Cylinder
5.15.1 When the cylinder is welded from steel plates, the steel plates shall be The rolling direction shall be consistent with the circumferential direction of the cylinder. 5.15.2 The difference e between the maximum and minimum diameters of the same cross section of the cylinder shall not exceed 0.01D. 5.15.3 The misalignment 6 of the longitudinal weld of the cylinder shall not exceed 0.1S (Figure 3). 5.15.4 The angular height E of the longitudinal weld of the cylinder shall not exceed 0.1S.+2mm (Figure 4). Use a sample with a length l of 1/2D but not more than 300mm for measurement.
5.16 Head
GB 5100--94
5.16.1 The head must be made of a whole piece of steel plate. 5.16.2 The shape and size tolerances of the head shall not exceed the provisions of Table 6. The symbols are shown in Figure 5. Table 6
Nominal diameter
100~~700
Circumference tolerance
Maximum and minimum diameter difference
Surface concave and convex amount
Gap between curved surface and sample
5.16.3 The actual minimum wall thickness of the head shall not be less than the sum of the designed wall thickness of the head and the corrosion allowance. 5.16.4 The longitudinal wrinkle depth of the straight edge of the head shall not be greater than 0.25%D and shall not be greater than 1.5mm. 5.17 Limit deviation of dimensions without tolerances
Limit deviation of dimensions without tolerances shall be in accordance with the provisions of GB1804, with the following specific requirements: IT14 for machined parts;
IT16 for non-machined parts;
Length dimension is ±IT16.
5.18 Assembly
Inner height tolerance
GB 510094
5.18.1 All parts of the cylinder shall be inspected and qualified before assembly, and no forced assembly is allowed. 5.18.2 The misalignment 6 and the angular height E of the butt weld between the head and the cylinder shall not exceed the provisions of Table 7, and the length of the inspection ruler shall not be less than 300mm.
Nominal wall thickness S of the cylinder,
Misalignment b
0. 10 S, +1
Height of corners E
0.10 Sh+2
5.18.3When the cylinder is composed of two parts, the straightness of the cylindrical barrel part shall not be greater than two-tenths of its length, 5.18.4The assembly of accessories shall comply with the provisions of the drawings. mm
5.19Surface quality
The outer surface of the cylinder shall be smooth, without cracks, heavy skin, inclusions, pits, scratches, corrosion and other defects with a depth exceeding 0.5mm, otherwise it shall be ground, and the ground part shall be smooth, and its wall thickness shall not be less than the sum of the designed wall thickness and the corrosion allowance. 5.20Heat treatment
After all welding is completed, the cylinder must be subjected to overall normalizing or stress relief heat treatment. Heat treatment shall be strictly carried out according to the heat treatment process. The actual measurement record should be recorded in the product certificate. 5.21 Volume and weight
5.21.1 The measured water volume of the cylinder should not be less than its nominal volume. For cylinders with a nominal volume greater than 150L, the measured volume can be replaced by the theoretical volume, but there must be no negative deviation. 5.21.2 After the cylinder is manufactured, the net weight should be measured one by one. 5.22 Water pressure test and air tightness test
5.22.1 The water pressure test of the cylinder should be carried out after heat treatment. The water pressure test pressure is determined according to Article 4.2. Maintain the pressure for 3 to 5 minutes under the water pressure test pressure for inspection. The cylinder shall not have macroscopic deformation or leakage, and the pressure gauge is not allowed to drop back. Immediately after the test, drain the water and dry it.
5.22.2 The air tightness test of the cylinder must be carried out after the water pressure test is passed. The airtightness test pressure of low-pressure liquefied gas cylinders is the nominal working pressure, and the airtightness test pressure of dissolved acetylene gas cylinders is 3MPa. Maintain the pressure under the test pressure for 1 to 3 minutes, and the tested cylinder shall not leak.
5.22.3 If leakage is found on the weld during the water pressure test and airtightness test, it can be repaired according to the provisions of Article 5.14. After the weld of the cylinder is repaired, the overall heat treatment should be carried out again. 5.22.4 The weld repaired in the following cases does not need to be heat treated again. Pinhole leakage;
h. The repair length does not exceed 25mm;
Same--the weld is repaired at no more than two places, and the distance between the two places is not less than 75mm. c.
5.22.5 After the weld is repaired, the water pressure test and airtightness test shall be carried out again according to the provisions of Articles 5.22.1 and 5.22.2. 5.23 Mechanical properties test and burst test
5.23.1 For steel cylinders with a nominal volume less than or equal to 150L, sample bottles should be drawn in batches for mechanical properties test and burst test. The test cylinders must be qualified by radiographic inspection and inspection. For steel cylinders with a nominal volume greater than 150L, product welding test plates can be prepared in batches for mechanical properties test. 5.23.2 When conducting mechanical properties test on the cylinder body, for steel cylinders composed of two parts, the test sampling position shall be in accordance with Figure 6. For steel cylinders consisting of three parts, the sampling locations are as shown in Figure 7. 185
Note: × indicates weld
Note: × indicates weld
1 piece of tensile test specimen
1 piece of tensile test specimen
GB5100-
1 piece of transverse face bend test specimen
1 piece of tensile test specimen
1 piece of transverse back bend test specimen
1 piece of transverse face bend test specimen
1 piece of transverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
1 piece Transverse face bend test specimen
1 piece Transverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
5.23.3 When using product welded test plates for mechanical property tests, the product welded test plates should be loaded and unloaded on the same steel plate (or the same batch of steel plates) as the test cylinder, and be welded together with the longitudinal weld as the extension of the longitudinal weld of the test cylinder, and heat treated in the same furnace as the test cylinder. The test plate should be stamped with the cylinder number and welder code of the test cylinder. The welds on the test plate shall be visually inspected and 100% radiographically tested, and shall comply with the provisions of Articles 5.12 and 5.13. The sampling positions of the test specimens on the welded test plate shall be as shown in Figure 8. 186
GB 5100--94
1 Tensile test specimen; 2--Bending test specimen; 3 Impact test specimen; 4-Discarded portion 5.23.4 The weld section of the test specimen shall be good and shall not have defects such as cracks, lack of fusion, lack of penetration, slag inclusions and pores. 5.23.5 The mechanical test results shall comply with the following provisions: The measured tensile strength 5 of the parent material of the cylinder body shall not be less than the lower limit of the parent material standard value, and the elongation shall not be less than the provisions of Table 8.
Measured tensile strength Gbe
Nominal wall thickness of bottle S
≤490MPa
>490 MPa
No matter where the fracture occurs, the measured tensile strength of the welded joint specimen shall not be less than the value specified in the parent material standard. The welded joint specimen has no cracks when bent to 100°, and the early cracking of the specimen edge can be ignored. The impact test results of the parent material and welded joint specimens meet the requirements of Article 5.3. The test result refers to the arithmetic mean of the three specimens, and it is allowed that one of the specimens is 1/6 lower than the specified qualified value. 5.23.6 The results of the cylinder burst test shall meet the following requirements: b. Under the test pressure Pb, the volume residual deformation rate of the cylinder shall not exceed 10%; b.
The measured value of the burst pressure Pb shall not be less than the result calculated according to formula (4); Ph=
D. -- Sb
（4）
The volume deformation rate of the cylinder when it ruptures (the ratio of the increase in cylinder volume to the actual volume of the cylinder before the test) shall not be less than the requirements of Table 9: 187
Ratio of cylinder length to nominal diameter
GB5100—94
>360～490
Volume deformation rate, %
d. The cylinder ruptures without producing fragments, and the bursting hole does not occur on the head (except for cylinders with only one girth weld and L≤2D), on the longitudinal weld and its fusion line, or on the girth weld (except for those perpendicular to the girth weld); the bursting hole of the cylinder is a plastic fracture, that is, there is an obvious shear lip on the fracture, but there is no obvious metal defect. e.
5.24 Painting
5.24.1 After the steel cylinder has passed the inspection, the surface oil, rust, scale, and welding spatter should be cleaned, and it can be painted only when it is kept dry.
5.24.2 Putty is not allowed on the surface of the steel cylinder. 5.24.3 The color marking of the steel cylinder shall comply with the provisions of GB7144. 6 Test methods
6.1 Material verification test
The verification test of the chemical composition and mechanical properties of the steel cylinder material shall be sampled, analyzed and tested according to the methods specified in its material standards. 6.2 Mechanical property test of welding process qualification test plate 6.2.1 According to the requirements of 5.10.2, when cutting the sample from the welding process qualification test plate (refer to Figure 8 for dimensions), the parts of the two ends of the test plate shall not be less than 50mm, and the sample is generally cut by mechanical processing. When flame cutting is used, the heat affected zone must be removed. When cutting the sample from the cylinder by flame cutting (refer to Figure 6 and Figure 7 for the cutting position), the heat affected zone shall not be left on the sample. 6.2.2 The number of weld joint samples used for welding procedure qualification is as follows: 2 tensile test specimens, 4 transverse bending test specimens (2 for face bending and 2 for back bending), and 6 impact test specimens (3 for weld and heat affected zone). 6.2.3 The front and back sides of the weld on the sample shall be machined to make them flush with the parent material. For uneven samples, they can be flattened by cold pressing.
6.2.4 The tensile test specimen is prepared according to Figure 9, and the tensile test is carried out according to GB228. 中
30 + S
190+Sx
6.2.5 The width of the bending test specimen is 25mm, and the bending test is carried out according to GB232. During the test, the axis of the bending shaft should be located at the center of the weld, and the distance between the two roller surfaces should be such that the specimen does not just touch the two sides of the roller (see Figure 10). The ratio between the bending shaft diameter d and the specimen thickness S is n188.18 Assembly
Inner height tolerance
GB 510094
5.18.1 Before assembly, all parts of the cylinder shall be inspected and qualified, and no forced assembly is allowed. 5.18.2 The misalignment 6 and the angular height E of the butt weld between the head and the cylinder shall not exceed the provisions of Table 7, and the length of the inspection ruler shall not be less than 300mm.
Nominal wall thickness S of the cylinder,
Misalignment b
0. 10 S, +1
Angular height E
0.10 Sh+2
5.18.3 When the cylinder consists of two parts, the straightness of the cylindrical cylinder part shall not be greater than two-tenths of its length. 5.18.4 The assembly of accessories shall comply with the provisions of the drawings. mm
5.19 Surface quality
The outer surface of the cylinder should be smooth, without cracks, heavy skin, inclusions, pits with a depth exceeding 0.5mm, scratches, corrosion and other defects. Otherwise, it should be ground. The ground part should be smooth, and its wall thickness should not be less than the sum of the designed wall thickness and the corrosion allowance. 5.20 Heat treatmentwww.bzxz.net
After all welding is completed, the cylinder must be subjected to overall normalizing or stress relief heat treatment. Heat treatment should be carried out strictly according to the heat treatment process. The actual measurement record should be recorded in the product certificate. 5.21 Volume and weight
5.21.1 The measured water volume of the cylinder should not be less than its nominal volume. For cylinders with a nominal volume greater than 150L, the actual measured volume can be replaced by the theoretical volume, but there must be no negative deviation. 5.21.2 After the cylinder is manufactured, the net weight should be measured one by one. 5.22 Hydrostatic test and airtightness test
5.22.1 The hydrostatic test of the cylinder shall be carried out after heat treatment. The hydrostatic test pressure shall be determined in accordance with Article 4.2. Maintain the pressure for 3 to 5 minutes under the hydrostatic test pressure and conduct inspection. The cylinder shall not have macroscopic deformation or leakage, and the pressure gauge shall not have any drop. Drain the water immediately after the test and dry it.
5.22.2 The airtightness test of the cylinder must be carried out after the hydrostatic test is qualified. The airtightness test pressure of the low-pressure liquefied gas cylinder is the nominal working pressure, and the airtightness test pressure of the dissolved acetylene gas cylinder is 3MPa. Maintain the pressure for 1 to 3 minutes under the test pressure, and the tested cylinder shall not have any leakage.
5.22.3 If leakage is found on the weld during the hydrostatic test and airtightness test, it can be repaired in accordance with the provisions of Article 5.14. After the weld of the cylinder is repaired, the overall heat treatment should be carried out again. 5.22.4 For weld repairs under the following conditions, reheat treatment is not required. Pinhole leakage;
h. Repair length does not exceed 25mm;
Same--The weld is repaired in no more than two places, and the distance between the two places is not less than 75mm. c.
5.22.5 After the weld is repaired, the water pressure test and air tightness test shall be re-performed in accordance with the provisions of Articles 5.22.1 and 5.22.2. 5.23 Mechanical properties test and burst test
5.23.1 For steel cylinders with a nominal volume less than or equal to 150L, sample bottles shall be taken in batches for mechanical properties test and burst test. The test cylinders must be qualified by radiographic inspection and inspection. For steel cylinders with a nominal volume greater than 150L, product welding test plates can be prepared in batches for mechanical properties test. 5.23.2 When conducting mechanical property tests on cylinder bodies, for cylinders consisting of two parts, the test sampling locations shall be in accordance with Figure 6. For cylinders consisting of three parts, the test sampling locations shall be in accordance with Figure 7.185
Note: × indicates weld
Note: × indicates weld
1 pieceTensile test specimen
1 pieceTensile test specimen
GB5100-
1 pieceTransverse face bend test specimen
1 pieceTensile test specimen
1 pieceTransverse back bend test specimen
1 pieceTransverse face bend test specimen
1 pieceTransverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
1 piece Transverse face bend test specimen
1 piece Transverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
5.23.3 When using product welded test plates for mechanical property tests, the product welded test plates should be loaded and unloaded on the same steel plate (or the same batch of steel plates) as the test cylinder, and be welded together with the longitudinal weld as the extension of the longitudinal weld of the test cylinder, and heat treated in the same furnace as the test cylinder. The test plate should be stamped with the cylinder number and welder code of the test cylinder. The welds on the test plate shall be visually inspected and 100% radiographically tested, and shall comply with the provisions of Articles 5.12 and 5.13. The sampling positions of the test specimens on the welded test plate shall be as shown in Figure 8. 186
GB 5100--94
1 Tensile test specimen; 2--Bending test specimen; 3 Impact test specimen; 4-Discarded portion 5.23.4 The weld section of the test specimen shall be good and shall not have defects such as cracks, lack of fusion, lack of penetration, slag inclusions and pores. 5.23.5 The mechanical test results shall comply with the following provisions: The measured tensile strength 5 of the parent material of the cylinder body shall not be less than the lower limit of the parent material standard value, and the elongation shall not be less than the provisions of Table 8.
Measured tensile strength Gbe
Nominal wall thickness of bottle S
≤490MPa
>490 MPa
No matter where the fracture occurs, the measured tensile strength of the welded joint specimen shall not be less than the value specified in the parent material standard. The welded joint specimen has no cracks when bent to 100°, and the early cracking of the specimen edge can be ignored. The impact test results of the parent material and welded joint specimens meet the requirements of Article 5.3. The test result refers to the arithmetic mean of the three specimens, and it is allowed that one of the specimens is 1/6 lower than the specified qualified value. 5.23.6 The results of the cylinder burst test shall meet the following requirements: b. Under the test pressure Pb, the volume residual deformation rate of the cylinder shall not exceed 10%; b.
The measured value of the burst pressure Pb shall not be less than the result calculated according to formula (4); Ph=
D. -- Sb
（4）
The volume deformation rate of the cylinder when it ruptures (the ratio of the increase in cylinder volume to the actual volume of the cylinder before the test) shall not be less than the requirements of Table 9: 187
Ratio of cylinder length to nominal diameter
GB5100—94
>360～490
Volume deformation rate, %
d. The cylinder ruptures without producing fragments, and the bursting hole does not occur on the head (except for cylinders with only one girth weld and L≤2D), on the longitudinal weld and its fusion line, or on the girth weld (except for those perpendicular to the girth weld); the bursting hole of the cylinder is a plastic fracture, that is, there is an obvious shear lip on the fracture, but there is no obvious metal defect. e.
5.24 Painting
5.24.1 After the steel cylinder has passed the inspection, the surface oil, rust, scale, and welding spatter should be cleaned, and it can be painted only when it is kept dry.
5.24.2 Putty is not allowed on the surface of the steel cylinder. 5.24.3 The color marking of the steel cylinder shall comply with the provisions of GB7144. 6 Test methods
6.1 Material verification test
The verification test of the chemical composition and mechanical properties of the steel cylinder material shall be sampled, analyzed and tested according to the methods specified in its material standards. 6.2 Mechanical property test of welding process qualification test plate 6.2.1 According to the requirements of 5.10.2, when cutting the sample from the welding process qualification test plate (refer to Figure 8 for dimensions), the parts of the two ends of the test plate shall not be less than 50mm, and the sample is generally cut by mechanical processing. When flame cutting is used, the heat affected zone must be removed. When cutting the sample from the cylinder by flame cutting (refer to Figure 6 and Figure 7 for the cutting position), the heat affected zone shall not be left on the sample. 6.2.2 The number of weld joint samples used for welding procedure qualification is as follows: 2 tensile test specimens, 4 transverse bending test specimens (2 for face bending and 2 for back bending), and 6 impact test specimens (3 for weld and heat affected zone). 6.2.3 The front and back sides of the weld on the sample shall be machined to make them flush with the parent material. For uneven samples, they can be flattened by cold pressing.
6.2.4 The tensile test specimen is prepared according to Figure 9, and the tensile test is carried out according to GB228. 中
30 + S
190+Sx
6.2.5 The width of the bending test specimen is 25mm, and the bending test is carried out according to GB232. During the test, the axis of the bending shaft should be located at the center of the weld, and the distance between the two roller surfaces should be such that the specimen does not just touch the two sides of the roller (see Figure 10). The ratio between the bending shaft diameter d and the specimen thickness S is n188.18 Assembly
Inner height tolerance
GB 510094
5.18.1 Before assembly, all parts of the cylinder shall be inspected and qualified, and no forced assembly is allowed. 5.18.2 The misalignment 6 and the angular height E of the butt weld between the head and the cylinder shall not exceed the provisions of Table 7, and the length of the inspection ruler shall not be less than 300mm.
Nominal wall thickness S of the cylinder,
Misalignment b
0. 10 S, +1
Angular height E
0.10 Sh+2
5.18.3 When the cylinder consists of two parts, the straightness of the cylindrical cylinder part shall not be greater than two-tenths of its length. 5.18.4 The assembly of accessories shall comply with the provisions of the drawings. mm
5.19 Surface quality
The outer surface of the cylinder should be smooth, without cracks, heavy skin, inclusions, pits with a depth exceeding 0.5mm, scratches, corrosion and other defects. Otherwise, it should be ground. The ground part should be smooth, and its wall thickness should not be less than the sum of the designed wall thickness and the corrosion allowance. 5.20 Heat treatment
After all welding is completed, the cylinder must be subjected to overall normalizing or stress relief heat treatment. Heat treatment should be carried out strictly according to the heat treatment process. The actual measurement record should be recorded in the product certificate. 5.21 Volume and weight
5.21.1 The measured water volume of the cylinder should not be less than its nominal volume. For cylinders with a nominal volume greater than 150L, the actual measured volume can be replaced by the theoretical volume, but there must be no negative deviation. 5.21.2 After the cylinder is manufactured, the net weight should be measured one by one. 5.22 Hydrostatic test and airtightness test
5.22.1 The hydrostatic test of the cylinder shall be carried out after heat treatment. The hydrostatic test pressure shall be determined in accordance with Article 4.2. Maintain the pressure for 3 to 5 minutes under the hydrostatic test pressure and conduct inspection. The cylinder shall not have macroscopic deformation or leakage, and the pressure gauge shall not have any drop. Drain the water immediately after the test and dry it.
5.22.2 The airtightness test of the cylinder must be carried out after the hydrostatic test is qualified. The airtightness test pressure of the low-pressure liquefied gas cylinder is the nominal working pressure, and the airtightness test pressure of the dissolved acetylene gas cylinder is 3MPa. Maintain the pressure for 1 to 3 minutes under the test pressure, and the tested cylinder shall not have any leakage.
5.22.3 If leakage is found on the weld during the hydrostatic test and airtightness test, it can be repaired in accordance with the provisions of Article 5.14. After the weld of the cylinder is repaired, the overall heat treatment should be carried out again. 5.22.4 For weld repairs under the following conditions, reheat treatment is not required. Pinhole leakage;
h. Repair length does not exceed 25mm;
Same--The weld is repaired in no more than two places, and the distance between the two places is not less than 75mm. c.
5.22.5 After the weld is repaired, the water pressure test and air tightness test shall be re-performed in accordance with the provisions of Articles 5.22.1 and 5.22.2. 5.23 Mechanical properties test and burst test
5.23.1 For steel cylinders with a nominal volume less than or equal to 150L, sample bottles shall be taken in batches for mechanical properties test and burst test. The test cylinders must be qualified by radiographic inspection and inspection. For steel cylinders with a nominal volume greater than 150L, product welding test plates can be prepared in batches for mechanical properties test. 5.23.2 When conducting mechanical property tests on cylinder bodies, for cylinders consisting of two parts, the test sampling locations shall be in accordance with Figure 6. For cylinders consisting of three parts, the test sampling locations shall be in accordance with Figure 7.185
Note: × indicates weld
Note: × indicates weld
1 pieceTensile test specimen
1 pieceTensile test specimen
GB5100-
1 pieceTransverse face bend test specimen
1 pieceTensile test specimen
1 pieceTransverse back bend test specimen
1 pieceTransverse face bend test specimen
1 pieceTransverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
1 piece Transverse face bend test specimen
1 piece Transverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
5.23.3 When using product welded test plates for mechanical property tests, the product welded test plates should be loaded and unloaded on the same steel plate (or the same batch of steel plates) as the test cylinder, and be welded together with the longitudinal weld as the extension of the longitudinal weld of the test cylinder, and heat treated in the same furnace as the test cylinder. The test plate should be stamped with the cylinder number and welder code of the test cylinder. The welds on the test plate shall be visually inspected and 100% radiographically tested, and shall comply with the provisions of Articles 5.12 and 5.13. The sampling positions of the test specimens on the welded test plate shall be as shown in Figure 8. 186
GB 5100--94
1 Tensile test specimen; 2--Bending test specimen; 3 Impact test specimen; 4-Discarded portion 5.23.4 The weld section of the test specimen shall be good and shall not have defects such as cracks, lack of fusion, lack of penetration, slag inclusions and pores. 5.23.5 The mechanical test results shall comply with the following provisions: The measured tensile strength 5 of the parent material of the cylinder body shall not be less than the lower limit of the parent material standard value, and the elongation shall not be less than the provisions of Table 8.
Measured tensile strength Gbe
Nominal wall thickness of bottle S
≤490MPa
>490 MPa
No matter where the fracture occurs, the measured tensile strength of the welded joint specimen shall not be less than the value specified in the parent material standard. The welded joint specimen has no cracks when bent to 100°, and the early cracking of the specimen edge can be ignored. The impact test results of the parent material and welded joint specimens meet the requirements of Article 5.3. The test result refers to the arithmetic mean of the three specimens, and it is allowed that one of the specimens is 1/6 lower than the specified qualified value. 5.23.6 The results of the cylinder burst test shall meet the following requirements: b. Under the test pressure Pb, the volume residual deformation rate of the cylinder shall not exceed 10%; b.
The measured value of the burst pressure Pb shall not be less than the result calculated according to formula (4); Ph=
D. -- Sb
（4）
The volume deformation rate of the cylinder when it ruptures (the ratio of the increase in cylinder volume to the actual volume of the cylinder before the test) shall not be less than the requirements of Table 9: 187
Ratio of cylinder length to nominal diameter
GB5100—94
>360～490
Volume deformation rate, %
d. The cylinder ruptures without producing fragments, and the bursting hole does not occur on the head (except for cylinders with only one girth weld and L≤2D), on the longitudinal weld and its fusion line, or on the girth weld (except for those perpendicular to the girth weld); the bursting hole of the cylinder is a plastic fracture, that is, there is an obvious shear lip on the fracture, but there is no obvious metal defect. e.
5.24 Painting
5.24.1 After the steel cylinder has passed the inspection, the surface oil, rust, scale, and welding spatter should be cleaned, and it can be painted only when it is kept dry.
5.24.2 Putty is not allowed on the surface of the steel cylinder. 5.24.3 The color marking of the steel cylinder shall comply with the provisions of GB7144. 6 Test methods
6.1 Material verification test
The verification test of the chemical composition and mechanical properties of the steel cylinder material shall be sampled, analyzed and tested according to the methods specified in its material standards. 6.2 Mechanical property test of welding process qualification test plate 6.2.1 According to the requirements of 5.10.2, when cutting the sample from the welding process qualification test plate (refer to Figure 8 for dimensions), the parts of the two ends of the test plate shall not be less than 50mm, and the sample is generally cut by mechanical processing. When flame cutting is used, the heat affected zone must be removed. When cutting the sample from the cylinder by flame cutting (refer to Figure 6 and Figure 7 for the cutting position), the heat affected zone shall not be left on the sample. 6.2.2 The number of weld joint samples used for welding procedure qualification is as follows: 2 tensile test specimens, 4 transverse bending test specimens (2 for face bending and 2 for back bending), and 6 impact test specimens (3 for weld and heat affected zone). 6.2.3 The front and back sides of the weld on the sample shall be machined to make them flush with the parent material. For uneven samples, they can be flattened by cold pressing.
6.2.4 The tensile test specimen is prepared according to Figure 9, and the tensile test is carried out according to GB228. 中
30 + S
190+Sx
6.2.5 The width of the bending test specimen is 25mm, and the bending test is carried out according to GB232. During the test, the axis of the bending shaft should be located at the center of the weld, and the distance between the two roller surfaces should be such that the specimen does not just touch the two sides of the roller (see Figure 10). The ratio between the bending shaft diameter d and the specimen thickness S is n188.10 S, +1
Emperature height E
0.10 Sh+2
5.18.3When the cylinder is composed of two parts, the straightness of the cylindrical barrel part shall not be greater than two-tenths of its length. 5.18.4The assembly of accessories shall comply with the provisions of the drawings. mm
5.19Surface quality
The outer surface of the cylinder shall be smooth, without cracks, heavy skin, inclusions, pits with a depth exceeding 0.5mm, scratches, corrosion and other defects, otherwise it shall be ground, and the ground part shall be smooth, and its wall thickness shall not be less than the sum of the designed wall thickness and the corrosion allowance. 5.20Heat treatment
After all welding is completed, the cylinder must be subjected to overall normalizing or stress relief heat treatment. Heat treatment shall be strictly carried out according to the heat treatment process. The actual measurement record shall be recorded in the product certificate. 5.21 Volume and weight
5.21.1 The measured water volume of the cylinder shall not be less than its nominal volume. For cylinders with a nominal volume greater than 150L, the measured volume may be replaced by the theoretical volume, but there shall be no negative deviation. 5.21.2 The net weight of each cylinder shall be measured after manufacture. 5.22 Water pressure test and air tightness test
5.22.1 The water pressure test of the cylinder shall be carried out after heat treatment. The water pressure test pressure shall be determined in accordance with Article 4.2. Maintain the pressure for 3 to 5 minutes under the water pressure test pressure and conduct inspection. The cylinder shall not have macroscopic deformation or leakage, and the pressure gauge shall not be allowed to drop. Immediately after the test, drain the water and dry it.
5.22.2 The air tightness test of the cylinder must be carried out after the water pressure test is qualified. The airtightness test pressure of low-pressure liquefied gas cylinders is the nominal working pressure, and the airtightness test pressure of dissolved acetylene gas cylinders is 3MPa. Maintain the pressure under the test pressure for 1 to 3 minutes, and the tested cylinder shall not leak.
5.22.3 If leakage is found on the weld during the water pressure test and airtightness test, it can be repaired according to the provisions of Article 5.14. After the weld of the cylinder is repaired, the overall heat treatment should be carried out again. 5.22.4 The weld repaired in the following cases does not need to be heat treated again. Pinhole leakage;
h. The repair length does not exceed 25mm;
Same--the weld is repaired at no more than two places, and the distance between the two places is not less than 75mm. c.
5.22.5 After the weld is repaired, the water pressure test and airtightness test shall be carried out again according to the provisions of Articles 5.22.1 and 5.22.2. 5.23 Mechanical properties test and burst test
5.23.1 For steel cylinders with a nominal volume less than or equal to 150L, sample bottles should be drawn in batches for mechanical properties test and burst test. The test cylinders must be qualified by radiographic inspection and inspection. For steel cylinders with a nominal volume greater than 150L, product welding test plates can be prepared in batches for mechanical properties test. 5.23.2 When conducting mechanical properties test on the cylinder body, for steel cylinders composed of two parts, the test sampling position shall be in accordance with Figure 6. For steel cylinders consisting of three parts, the sampling locations are as shown in Figure 7. 185
Note: × indicates weld
Note: × indicates weld
1 piece of tensile test specimen
1 piece of tensile test specimen
GB5100-
1 piece of transverse face bend test specimen
1 piece of tensile test specimen
1 piece of transverse back bend test specimen
1 piece of transverse face bend test specimen
1 piece of transverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
1 piece Transverse face bend test specimen
1 piece Transverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
5.23.3 When using product welded test plates for mechanical property tests, the product welded test plates should be loaded and unloaded on the same steel plate (or the same batch of steel plates) as the test cylinder, and be welded together with the longitudinal weld as the extension of the longitudinal weld of the test cylinder, and heat treated in the same furnace as the test cylinder. The test plate should be stamped with the cylinder number and welder code of the test cylinder. The welds on the test plate shall be visually inspected and 100% radiographically tested, and shall comply with the provisions of Articles 5.12 and 5.13. The sampling positions of the test specimens on the welded test plate shall be as shown in Figure 8. 186
GB 5100--94
1 Tensile test specimen; 2--Bending test specimen; 3 Impact test specimen; 4-Discarded portion 5.23.4 The weld section of the test specimen shall be good and shall not have defects such as cracks, lack of fusion, lack of penetration, slag inclusions and pores. 5.23.5 The mechanical test results shall comply with the following provisions: The measured tensile strength 5 of the parent material of the cylinder body shall not be less than the lower limit of the parent material standard value, and the elongation shall not be less than the provisions of Table 8.
Measured tensile strength Gbe
Nominal wall thickness of bottle S
≤490MPa
>490 MPa
No matter where the fracture occurs, the measured tensile strength of the welded joint specimen shall not be less than the value specified in the parent material standard. The welded joint specimen has no cracks when bent to 100°, and the early cracking of the specimen edge can be ignored. The impact test results of the parent material and welded joint specimens meet the requirements of Article 5.3. The test result refers to the arithmetic mean of the three specimens, and it is allowed that one of the specimens is 1/6 lower than the specified qualified value. 5.23.6 The results of the cylinder burst test shall meet the following requirements: b. Under the test pressure Pb, the volume residual deformation rate of the cylinder shall not exceed 10%; b.
The measured value of the burst pressure Pb shall not be less than the result calculated according to formula (4); Ph=
D. -- Sb
（4）
The volume deformation rate of the cylinder when it ruptures (the ratio of the increase in cylinder volume to the actual volume of the cylinder before the test) shall not be less than the requirements of Table 9: 187
Ratio of cylinder length to nominal diameter
GB5100—94
>360～490
Volume deformation rate, %
d. The cylinder ruptures without producing fragments, and the bursting hole does not occur on the head (except for cylinders with only one girth weld and L≤2D), on the longitudinal weld and its fusion line, or on the girth weld (except for those perpendicular to the girth weld); the bursting hole of the cylinder is a plastic fracture, that is, there is an obvious shear lip on the fracture, but there is no obvious metal defect. e.
5.24 Painting
5.24.1 After the steel cylinder has passed the inspection, the surface oil, rust, scale, and welding spatter should be cleaned, and it can be painted only when it is kept dry.
5.24.2 Putty is not allowed on the surface of the steel cylinder. 5.24.3 The color marking of the steel cylinder shall comply with the provisions of GB7144. 6 Test methods
6.1 Material verification test
The verification test of the chemical composition and mechanical properties of the steel cylinder material shall be sampled, analyzed and tested according to the methods specified in its material standards. 6.2 Mechanical property test of welding process qualification test plate 6.2.1 According to the requirements of 5.10.2, when cutting the sample from the welding process qualification test plate (refer to Figure 8 for dimensions), the parts of the two ends of the test plate shall not be less than 50mm, and the sample is generally cut by mechanical processing. When flame cutting is used, the heat affected zone must be removed. When cutting the sample from the cylinder by flame cutting (refer to Figure 6 and Figure 7 for the cutting position), the heat affected zone shall not be left on the sample. 6.2.2 The number of weld joint samples used for welding procedure qualification is as follows: 2 tensile test specimens, 4 transverse bending test specimens (2 for face bending and 2 for back bending), and 6 impact test specimens (3 for weld and heat affected zone). 6.2.3 The front and back sides of the weld on the sample shall be machined to make them flush with the parent material. For uneven samples, they can be flattened by cold pressing.
6.2.4 The tensile test specimen is prepared according to Figure 9, and the tensile test is carried out according to GB228. 中
30 + S
190+Sx
6.2.5 The width of the bending test specimen is 25mm, and the bending test is carried out according to GB232. During the test, the axis of the bending shaft should be located at the center of the weld, and the distance between the two roller surfaces should be such that the specimen does not just touch the two sides of the roller (see Figure 10). The ratio between the bending shaft diameter d and the specimen thickness S is n188.10 S, +1
Emperature height E
0.10 Sh+2
5.18.3When the cylinder is composed of two parts, the straightness of the cylindrical barrel part shall not be greater than two-tenths of its length. 5.18.4The assembly of accessories shall comply with the provisions of the drawings. mm
5.19Surface quality
The outer surface of the cylinder shall be smooth, without cracks, heavy skin, inclusions, pits with a depth exceeding 0.5mm, scratches, corrosion and other defects, otherwise it shall be ground, and the ground part shall be smooth, and its wall thickness shall not be less than the sum of the designed wall thickness and the corrosion allowance. 5.20Heat treatment
After all welding is completed, the cylinder must be subjected to overall normalizing or stress relief heat treatment. Heat treatment shall be strictly carried out according to the heat treatment process. The actual measurement record shall be recorded in the product certificate. 5.21 Volume and weight
5.21.1 The measured water volume of the cylinder shall not be less than its nominal volume. For cylinders with a nominal volume greater than 150L, the measured volume may be replaced by the theoretical volume, but there shall be no negative deviation. 5.21.2 The net weight of each cylinder shall be measured after manufacture. 5.22 Water pressure test and air tightness test
5.22.1 The water pressure test of the cylinder shall be carried out after heat treatment. The water pressure test pressure shall be determined in accordance with Article 4.2. Maintain the pressure for 3 to 5 minutes under the water pressure test pressure and conduct inspection. The cylinder shall not have macroscopic deformation or leakage, and the pressure gauge shall not be allowed to drop. Immediately after the test, drain the water and dry it.
5.22.2 The air tightness test of the cylinder must be carried out after the water pressure test is qualified. The airtightness test pressure of low-pressure liquefied gas cylinders is the nominal working pressure, and the airtightness test pressure of dissolved acetylene gas cylinders is 3MPa. Maintain the pressure under the test pressure for 1 to 3 minutes, and the tested cylinder shall not leak.
5.22.3 If leakage is found on the weld during the water pressure test and airtightness test, it can be repaired according to the provisions of Article 5.14. After the weld of the cylinder is repaired, the overall heat treatment should be carried out again. 5.22.4 The weld repaired in the following cases does not need to be heat treated again. Pinhole leakage;
h. The repair length does not exceed 25mm;
Same--the weld is repaired at no more than two places, and the distance between the two places is not less than 75mm. c.
5.22.5 After the weld is repaired, the water pressure test and airtightness test shall be carried out again according to the provisions of Articles 5.22.1 and 5.22.2. 5.23 Mechanical properties test and burst test
5.23.1 For steel cylinders with a nominal volume less than or equal to 150L, sample bottles should be drawn in batches for mechanical properties test and burst test. The test cylinders must be qualified by radiographic inspection and inspection. For steel cylinders with a nominal volume greater than 150L, product welding test plates can be prepared in batches for mechanical properties test. 5.23.2 When conducting mechanical properties test on the cylinder body, for steel cylinders composed of two parts, the test sampling position shall be in accordance with Figure 6. For steel cylinders consisting of three parts, the sampling locations are as shown in Figure 7. 185
Note: × indicates weld
Note: × indicates weld
1 piece of tensile test specimen
1 piece of tensile test specimen
GB5100-
1 piece of transverse face bend test specimen
1 piece of tensile test specimen
1 piece of transverse back bend test specimen
1 piece of transverse face bend test specimen
1 piece of transverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
1 piece Transverse face bend test specimen
1 piece Transverse back bend test specimen
1 piece Tensile test specimen
1 piece Tensile test specimen
5.23.3 When using product welded test plates for mechanical property tests, the product welded test plates should be loaded and unloaded on the same steel plate (or the same batch of steel plates) as the test cylinder, and be welded together with the longitudinal weld as the extension of the longitudinal weld of the test cylinder, and heat treated in the same furnace as the test cylinder. The test plate should be stamped with the cylinder number and welder code of the test cylinder. The welds on the test plate shall be visually inspected and 100% radiographically tested, and shall comply with the provisions of Articles 5.12 and 5.13. The sampling positions of the test specimens on the welded test plate shall be as shown in Figure 8. 186
GB 5100--94
1 Tensile test specimen; 2--Bending test specimen; 3 Impact test specimen; 4-Discarded portion 5.23.4 The weld section of the test specimen shall be good and shall not have defects such as cracks, lack of fusion, lack of penetration, slag inclusions and pores. 5.23.5 The mechanical test results shall comply with the following provisions: The measured tensile strength 5 of the parent material of the cylinder body shall not be less than the lower limit of the parent material standar
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