Some standard content:
1t's 4. 020. cu
Case number: 24321999
Ship Industry Standard of the People's Republic of China
CB/T 493-1998
Low pressure air bottle
Lowpressureairbottle
Published on 1998-12-29
China State Shipbuilding Corporation
Implemented on 1999-06-01
CB/T 493—1998
Low pressure air bottle is widely used in various ships as the starting device of the main engine and auxiliary equipment. This standard is a revision of CB493-57 based on actual experience and the advanced content of similar standards at home and abroad recently: the main technical differences between this standard and CB°493-87 are as follows: 1. Six more levels are added to the parameter series; 2. Design pressure is added; 3. Inspection holes, signal holes and corrosion margin within the service limit are added; 4. Preparation of test specimens is added; 5. Welding test and deep damage range are added; 6. Technical requirements for bottle head are added; 7. Inspection and test methods are added; 8. Fusible plug test and safety test are added. This standard shall replace CB493-87 from the date of implementation. This standard was proposed by the 601st Institute of China State Shipbuilding Corporation. This standard is under the jurisdiction of the 74th Institute of the 7th Institute of China State Shipbuilding Corporation. Drafting unit of this standard: Chief editor of the 704th Institute of the 7th Institute of China State Shipbuilding Corporation, and deputy editor of the 601st Institute. The main drafters of this standard are Sun Hongjiu, Zhong Chongxin, Qian Hong, Mo Xuezhong, and Li Panbao. The standard was issued in March 1966. It was revised for the first time in February 1987. 2
C3/T493-1998
1-Water discharge valve; 2-Inlet valve; 3-Pressure gauge: 4-Easy-to-use safety valve 5-Air outlet valve: 8-Minimum valve: 7-End valve: 9-Simplified: 9-Lower end Figure 1 Vertical or inclined case gas cylinder
1 Manhole device: 2-End valve: 3-Self diagram: 4-Pressure gauge: 5-Lifting: 6 Safety room 7-Remote digging valve: 8-Simplified 19-Air outlet: 10-Seat distance 11-Water discharge cabinet Figure 2 Horizontal climbing gas cylinder
3.2 Parameter series
The parameter series of air cylinders is in accordance with Table 1.
A0,10-1
A0.16—1
A0.32—1
A0. 40--1
A0.05—3
A0.08—3
A0.50—3
BO. 80— 3
: B4. 003
F4. 50-3
i B5. 00 - 3
B12. 0—3
B14. 00—3
B16. GU - 3bzxz.net
CB/T 493—1998
Table 1 Parameter series
II Diameter DN
3.3 Product marking
3.3.1 The model composition of the air cylinder is as follows
3.3.2 Marking example:
CB/T493-1998
1 As, MPa:
Volume, m3
Type, (A: B)
Throughput 0.40m, working pressure 1MPa. The air cylinder with vertical or inclined installation form is marked as: Air cylinder A0.40—1 CB/T 493—1998 Volume 4.00m, working pressure 3MPa, and the air cylinder with horizontal installation form is marked as: Air cylinder B4.00-3 CB/T 493--19584 Technical requirements
4.1 Design
4.1.1 The air bottle shall include the body, inlet valve, exhaust valve, pressure gauge, drain balance, safety valve or fusible plug and a space for remote control.
4.1.2 The design pressure of the air bottle shall be 1.1 times the working pressure. 4.1.3 The design pressure of the air bottle equipped with a safety valve shall not exceed the opening pressure of the safety valve. 4.1.4 The opening pressure of the safety valve shall be greater than the working pressure of the air bottle and less than the design pressure. The back plug pressure shall not be less than 0.85 times the working pressure.
4.1.5 The body of the air bottle shall be able to withstand a hydraulic test of .5 times the design pressure without any leakage or pipe failure. Abnormal deformation is not allowed. 4.1.6 The air bottle with a cut-off sleeve device shall be able to withstand a gas pressure test of the working pressure and shall not leak. 4.1.7 If a safety valve is installed on the air intake or on the compressor, and it can prevent the maximum pressure from exceeding the design pressure during inflation, the air bottle may not be equipped with a safety valve, but a fusible plug should be installed. The melting point of the fusible plug is about 100°C, generally 955°C, and the size of the fusible plug should ensure that air can be effectively discharged in the event of a failure. Air bottles used for remote control are still equipped with safety structures. 4.1.8 The calculated thickness or the limited minimum wall thickness (excluding corrosion) should be indicated on the design drawings of the air bottle. 4.1.9 When determining the wall thickness of the air bottle design, in addition to considering the corrosion, impact and wear of the medium on the air bottle, the corrosion margin within the design service life should also be fully considered to meet the safe operation requirements of the air bottle. 4.1.10 When the cylinder diameter of the gas cylinder is less than 700mm, there should be no manhole; when the cylinder diameter is equal to or greater than 7cm, a manhole should be opened. The size of the circular inspection hole shall not be less than 75mm, the size of the elliptical inspection hole shall not be less than 75mm×50mm, and the size of the elliptical manhole shall not be less than 40cm×30mm. The short axis of the manhole should be arranged along the weft direction of the cylinder as much as possible. 4.1.11 The manhole cover and inspection hole cover closed from the inside have a convex shoulder. The distance between the concave shoulder and the manhole or inspection hole should not be greater than ?nm. The sealing material should be copper gaskets or oil-resistant rubber. 4.1.12 The discharge device should be able to discharge the residual water in the air cylinder. 4.1.13 The longitudinal welding joints of the cylinder of the air cylinder, the ring joints between the cylinder section and the cylinder section, the cylinder and the head, and the head splicing joints must adopt the full penetration butt joint type. When sealing welding is performed by the method of sealing, it is allowed to install the backing plate for reverse welding, but the backing plate material should be the same as the backing plate of the simplified plate:
4.1.14 The reinforcement on the air bottle and the backing plate welded around the reinforcement should be provided with at least one leakage signal indicating screw hole with a diameter not less than M6.
1 Scope
Ship Industry Standard of the People's Republic of China
Low pressure air bottle
Lew pressure air bottle
CB/T493—1998
Classification number: 42
Agency CR4S3—87
This standard specifies the product classification, technical requirements, inspection methods, inspection rules, marking, packaging, transportation and storage of marine welded low pressure air bottles (hereinafter referred to as simplified air bottles).
This standard is used for air bottles with working pressure of 1 MPa and 3 MPa. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through explicit reference in this standard. The versions shown are valid when this standard is issued. All standards will be revised, and the parties using this standard should explore the possibility of using the latest version of the following standards. Basic types and sizes of gas welding, manual arc welding and gas shielded welding joints GB 985-88
GB 986--88 Basic types and sizes of buried weak coal welds GB3323---87 Radiography and quality classification of steel fusion welded butt joints GB11037-89 Test method for liquid pressure of lead-acid boilers and pressure vessels GB11038-89 Welding technology and accessories for medical components of boilers GB/T14087-93 Safety valves for ship air bottles GJB14.1A-89 Wheel and rail specifications for ships Surface ships 3 Product classification
3.1 Type
The installation forms of air bottles are divided into!
) Type A vertical or inclined air cylinder, without Figure 1:) Type B single air cylinder, see Figure,
Approved by China State Shipbuilding Corporation on December 29, 1998, and implemented on June 1, 1999
4.2 Materials
4.2.1 Steel plate
CB/T 493--1998
4.2.1.1 The deoxidation method and chemical composition of the steel plate material used for air cylinders shall comply with the requirements of Table 2. Table 2 Deoxidation method and chemical composition of steel plate materials used in air deoxidation Material grade Deoxidation method Chain static and refined grains Stabilized refined grains Stabilized fine grains Stabilized fine grains Stabilized fine grains 2.25CriMo Chemical composition 0.10-~0.35;0.40~1.20≤0.040.15~0.350. 40 ~1. 200. 041 0. 10 ~ 0. 350. 50~ 1. 30≤0. 040. 13 ~0. 35 0, 50 --1. 300 040.10~0.5010.80~1.400,04
0. 15~0. 500. 80~1. 40≤0. 450. 15~0. 500. 90~1. 6020. 04G. 15~~0. 500. 90~-1. 60,0. 040. 10~0. 180. 15~0. 550. 40~1. 00[0. 040.08~0.180.15~0.500.40~0.800,041) When the temperature is greater than 30, the content of the steel plate can be ≤0.22%2) The steel plate can be deoxidized by aluminum,
4.2.1.2 The mechanical properties of the steel plate material used for air cylinders shall comply with the requirements of Table 3. AI
0. 015 --
3 Mechanical properties of steel plate materials for air cylinders Tensile weakness
Rim material grade
2.25Cr1Mo
360~480
410-530
450-580
490-610
440~550
430630
Crown service point b not less than N/mm
Thickness circumference
36≤~40
40---60
Elongation not less than %
Thickness range m
40~-50
Other optical fibers
Total amount 0.7
0.69N0.30
Compound type notch impact test
Test humidity
Average impact power J
The paneling of air bottles should be normalized or replaced by controlled rolling method with equivalent effect during wheel making. 4.2.1.3
4.2.1.4 The steel plates used for air cylinders shall not have cracks, spores, folds, inclusions and delamination, but the surface is allowed to have rusty iron sheets that do not hinder inspection, 5
CB/T-493-1993
iron and slight roughness caused by pressing oxide scale, scratches and rolling or mesh patterns. 4.2.2 Forgings
4.2.2.1 Forgings for air cylinders shall be forged in factories approved by the ship surveyor and shall be marked with the approval mark of the surveyor at the specified place. 4.2.2.2 Forgings shall be made of killed steel materials. 4.2.2.3 Forgings shall be guaranteed to be free of self-pointing, and their molds shall not have defects such as delamination, cracks, scabbing, slag inclusions, dense hairline and burnt phenomenon.
Forgings are allowed to repair defects by welding. 4.2. 2. 4
After heat treatment, the chemical composition of plated parts shall conform to the provisions of Table 4. Chemical composition of forged parts
Carbonized and carbon steel:
1Cr0.53Mo
2. 25Cr1M4
Tensile strength
not less than
≤0.200. 10~0. 400.50~1.200. 040. 040. 23 |0. 13~0. 40:0. 60~1. 40≤0. 04 : 0. 04
≤0. 25 j0.10~0. 4013. 901. 700.045.0
50. 20 :0. 15~0. 40;0. 41~0. 70! ≤0. 04≤0. 04s0.02*
Dai Yuyuan
Nis:0. 40 Crs40. 25
Mos0. 10 Cu0. 30
Total 0.80
0. 85~-1. 15j0. 45~-0. 6
≤0. 153. 15~0. 400.40~ 0. 70 ≤0. 04≤0. 04 j≤0. 02:2. 00~2. 5310. 00~1. 201) The acid-free aluminum content of fine-grained steel shall be ≥ 0.015%, or the total lead content shall be ≥ 0.018%. 2) For alloy steel, as long as the acid-free aluminum content does not exceed 0.020%, any total aluminum content is acceptable. 4.2.2.6 After heat treatment, the mechanical properties of forgings shall comply with the provisions of 5. Table 5 Mechanical properties of forgings
Suitable diameter or effective thickness t tensile strength not less than! Not less than
53~230
Carbon steel and acid-free manganese steel
Fine grain
Carbon steel and carbon steel
63~250
63~250
3≤~250
63~250
63≤~250
Elongation not more than!
110~155
130~175
140--180
110155
330~170
140~180
2.25CriMo
Diameter or equivalent thickness
CH/T 493~ 1998
Finished
Mechanical properties of forgings
Tensile strength is not less than
Crown limit point is not small! The length ratio is not less than
① For the middle of the tensile strength, the corresponding minimum product range can be obtained by the internal method, 18
119-150
143185
② The range of heat resistance of each grade of the test and the appropriate shrinkage is 120N/mm, and the range of tensile strength of the alloy solution is 150N/rimt.
Tension specimens can be taken at both ends of the forged steel, and the strength of the forging should not exceed 70N/mm. ③Only small forgings tested in batches have hardness test requirements, 4.3 Sliding
4.3.1 Head, the body is formed by cold or hot working, but the hammer production or shaping shall not be used. The head is formed by hot pressing, and there shall be no over-transit phenomenon.
4.3.2 The welding grooves of the head and the shell should be processed by mechanical welding or gas processing. The joint type and assembly clearance of the joint should comply with the provisions of G085 or GB 986.
4.3.3 When the steel plates of the head and the shell are butt-jointed, the distance between the butt weld and the center line of the gasket should be less than one-fourth of the inner diameter of the air cylinder, as shown in Figure 3.
Figure 3 Head splicing
4.3.4 When the head and the shell are butt-welded, if the distance from the plate is not equal, the thicker plate should be cut off, and the end thickness of the front bevel layer should be equal to the thickness of the plate, and the length of the bevel should be greater than or equal to times the thickness difference, as shown in 4. Figure 4 Head and shell beveling
CH/T 493—1998
4.3.5 The deviation of the main dimensions of the elliptical head shall comply with the provisions of Table 6, as shown in Figure 5. Table 6 Main dimensions of elliptical head
True diameter of head
800~-1200
>1200~1600
≥1600~2400
Diameter deviation
Roundness tolerance value
Dense face convex plate
DN+ADN
Figure 5 Main dimension deviation of circular head
Difference in curvature
True edge height difference
4.3.6 When rolling the shell, it is necessary to prevent the occurrence of defects such as beveling, overbending, taper, and drumming of the shell edge. The cylinder should be configured according to the diameter of the manufactured head, and the cylinder roundness should comply with the provisions of the table.
Table 7 Cylinder roundness tolerance
Inner diameter of air cylinder
300460
460-600
600-900
900～1220
1220≤~1520
1530~1900
19002300
23002670
Cylinder length tolerance
Outer shape wheel running technology
4.3.7 The cylinder length tolerance should not exceed 3mm. The straightness should not exceed 1.5mm per meter. The full length of the air cylinder should not exceed 5mm.
4:4 Welding
4.4.1 Preparation before welding
4.4.1.1 Before welding, the oxides, moisture, oil and other dirt that affect the quality of the joint should be removed from the weld edge of the weldment groove within a range of at least 25mm.
CB/T 493.1998
4.4.1.2 The image and edge defects that affect the welding quantity should be removed before welding. 4.4.1.3 Low-hydrogen or ultra-low-hydrogen welding materials should be used for welding without welding.Periodic tests and inspections shall be carried out according to the instructions for use of the welding materials.
4.4.1.4 The misalignment between the two plates of the air cylinder butt weld at any point shall not exceed 10% of the thickness, the mutual logarithm chain shall not exceed 3 mm, and the joint shall not exceed 4 m. 4.4.2 The welder qualification and blasting mark shall comply with the relevant provisions of GE 11038. 4.4.3 The welding environment and welding process approval shall comply with the relevant provisions of GB11038. 4.4.4 Weld
4.4.4.1 The weld surface shall be uniform and dense, and shall not have cracks, weld cancer, pores, slag inclusions, bites, isolated pits, incomplete welding, incomplete penetration, incomplete fusion or other defects visible to the naked eye. If there are any of the above defects, they shall be eliminated before non-destructive testing. During the process of welding, the spatter on both sides of the weld must be removed. 4.4.4.2 The weld surface can be flush with the material, or the total thickness of the center of the weld can be slightly larger than the thickness of the weld. The change of the weld height should be gradually adjusted. There should be no flat or sharp-angled appearance on the weld. 4.4.4.3 After the weld is polished to eliminate the defects or mechanical damage, its thickness should not be less than the negative difference thickness of the parent material. 4.4.4.4 There should be no cross seams in the assembly of air cylinders. The distance between the longitudinal welds between the head and the tube section and the two tube sections shall not be less than 200
4.4. 4.5 When any defects are found on the weld, they must be repaired after elimination. The number of repairs for the same part should not exceed two times. After the repair, the incident light ratio inspection and heat treatment shall be carried out as required. 4.4.4.6 When welding on one side, appropriate measures shall be taken to ensure that the root of the weld can be fully welded and the deformation caused by the metal shrinkage of the weld chain is minimized.
4.4.5 Welding test
4.4.5.1 The material grade and thickness of the test plate for air welding shall be the same as those of the steel sheet. The bevel of the test plate shall be close to the groove of the steel sheet weld.
4.4.5.2 The girth weld shall not be made into a test piece. If the steel sheet has a girth weld or the girth weld is different from the crack weld, a girth weld mold test piece shall be welded.
4.4.5.3 The welding brush of the test plate shall be welded with the same method, process, heat treatment and the same welding rod, welding wire and flux as the product welding. The test plate shall be heat treated in the same furnace as the test plate.
4.4.5.4 The product welding test plate shall be welded by the welder of the welded product, and the welder and inspector code shall be stamped after welding. 4.4.5.5 The selection of the required equipment for air cylinders shall be carried out in accordance with the provisions of GB11C33. 4.4.5.6 The results of the welding test of air cylinder products shall comply with the provisions of Table 4 of GB11038. 4.4.6 Non-destructive testing
4.4. 5.1 The specifications of non-destructive testing shall be in accordance with the provisions of Table 8. 8 Non-destructive testing specifications
Pressure vessel level
Rubber balance
X-ray radiography
Non-destructive testing or non-destructive testing
P≤1. 57 At the same time 3≤16 and t,[502,8,t are all less than the requirements of the level, but P>1. 51 or a≥16 or t≥15 100% inspection shall be carried out on the port seams of the test plate, and no less than 10% inspection shall be carried out on the screen seams of the product. For those that have not been inspected by radiography, 10% random inspection by magnetic field testing or latent penetration testing shall be carried out. CB/T493—1998 4.4.6.2 For air cylinders belonging to Class I pressure vessels, the test plates may be exempted from X-ray film inspection. The test plates of the first-class product shall be subjected to 100% X-ray film inspection as required for Class I pressure vessels. 4.4.6.3 For all low-pressure air bottles specified in GJB14.1A, 100% X-ray film inspection shall be carried out for the test drum. 4.4.6.4 For all medium and low-pressure air bottles specified in GJB14.1A, the longitudinal welds of the butt joints shall be inspected for more than 25% and the circumferential welds shall be inspected for more than 15% by X-ray film inspection, and the film evaluation shall be carried out in accordance with GB3323. The quality of the longitudinal welds shall not be less than Grade I, and the circumferential welds shall not be less than Grade II. 4.4.6.5 For all air bottles that belong to Grade 1 pressure vessels, the film evaluation of the butt joints shall be carried out in accordance with GB3323. The quality of the longitudinal welds shall not be less than Grade I, and the circumferential welds shall not be less than Grade II. 4.4.6.6 When the head is made of several pin plates, at least 10% X-ray film inspection shall be carried out before molding. After molding, 100% X-ray film inspection shall be carried out. Film evaluation shall be carried out in accordance with GB3323. The welding quality of the whole seam shall not be lower than Grade 1, and the welding quality of the circumferential seam shall not be lower than Grade II. 4.4.5.7 For air bottles that are partially inspected, the manufacturer shall still be responsible for the quality of the uninspected parts. 4.5 Heat treatment
4.5.1 Cold-formed heads must be subjected to normalizing heat treatment and non-destructive testing. 4.5.2 The following air bottles may be exempted from post-weld heat treatment: a) Air bottles of Class I pressure vessels shall be made of carbon steel, the thickness of the welded structure is less than 30mm and the working temperature is not greater than 150C; or carbon manganese steel is used, the thickness of the welded hook is less than 20mm and the working temperature is not greater than 150C; b) All air bottles of positive pressure vessels. 4.5.3 For air bottles that are to be subjected to overall heat treatment, if the overall heat treatment cannot be carried out due to conditions, segmented heat treatment is allowed, but it should be ensured that the entire length of the seam is subjected to heat treatment. 4.5.4 The temperature and holding time of heat treatment of air cylinders shall comply with the provisions of GB11038. 4.6 Bottle head valve
4.6.1 When designing the bottle head valve, the air inlet valve, air outlet valve, pressure gauge valve, drain valve, safety valve or fusible plug shall be assembled together as much as possible for easy operation.
4.6.2 When designing the bottle cap of the bottle head, it is allowed to use thick steel plates of the same grade as the cylinder instead. 5 Test method
5.1 Appearance and dimension inspection
5.1.1 Appearance inspection of welds
Use measuring tools and visual inspection to check the thickness of welds. The results shall comply with the provisions of 4.4.L.1~4.4.4.4. 5.1.2 Dimension inspection
Use measuring tools and daily measurement to inspect the length and misalignment of the head, cylinder and air cylinder. The results shall meet the requirements of 1.3.3, 4.3.4.4.3., 4.36 and 4.3.7.
5.2 Material inspection
5.2.1 Check the steel plate material against the material quality certificate, the result shall meet the requirements of 4.2.1, 5.2.2 Check the insert material against the material quality certificate, the result shall meet the requirements of 4.2.2. 5.3 Weld inspection
The butt weld of the air bottle shall be inspected in accordance with the provisions of GB3323, the result shall meet the requirements of 4.4.6.4, 4.4.6.5 and 4.4.6.6, 5.4 Welding test plate inspection
The welding test plate of the air bottle shall be inspected in accordance with the requirements of GB11038: the result shall meet the requirements of 4.4.5.4.4.6.2.4.4.6.3. 5.5 Liquid test
The hydraulic test of the air bottle body shall be carried out in accordance with GB11037, and the result shall meet the requirements of 4.1.5. 5.6 Air tightness test
The air bottle body shall be tested for air tightness only after it has passed the liquid creep test and the accessories have been installed. The air tightness test uses compressed air as the medium, the medium error is not less than 5, and the test pressure is the working pressure. During the test, the air bottle is immersed in water or the welds and other joints are coated with fertilizer 101 The material grade and thickness of the air cylinder test plate shall be the same as that of the cylinder, and the bevel of the test plate shall be in line with the groove of the cylinder weld.
4.4.5.2 The girth weld shall not be made into a thick test piece. If the cylinder has a girth weld or the girth weld is different from the cracking process, a girth weld mold test piece shall be welded.
4.4.5.3 The welding brush of the test plate shall be welded with the same method, process, heat treatment and the same welding rod, welding wire and flux as the product. The test plate shall be heat treated in the same furnace as the cylinder.
4.4.5.4 The product welding test plate shall be welded by the welder who welded the product, and the welder and inspector code shall be stamped after welding. 4.4.5.5 The selection of the required equipment of the air cylinder shall be carried out in accordance with the provisions of GB11C33. 4.4.5.6 The results of welding test of air cylinder products shall comply with the provisions of Table 4 of GB11038. 4.4.6 Nondestructive testing 4.4.5.1 Nondestructive testing specifications shall comply with the provisions of Table 8. 8 Nondestructive testing specifications Pressure vessel level X-ray penetration or flaw detection P≤1.57 At the same time 3≤16 and t,[502,8,t are all less than the level requirements, but P>1.51 or a≥16 or t≥15 100% inspection shall be carried out on the port seams of the test plate, and no less than 10% inspection shall be carried out on the screen seams of the product. For those that have not been inspected by radiography, 10% random inspection by magnetic field testing or latent penetration testing shall be carried out. CB/T493—1998 4.4.6.2 For air cylinders belonging to Class I pressure vessels, the test plates may be exempted from X-ray film inspection. The test plates of the first-class product shall be subjected to 100% X-ray film inspection as required for Class I pressure vessels. 4.4.6.3 For all low-pressure air bottles specified in GJB14.1A, 100% X-ray film inspection shall be carried out for the test drum. 4.4.6.4 For all medium and low-pressure air bottles specified in GJB14.1A, the longitudinal welds of the butt joints shall be inspected for more than 25% and the circumferential welds shall be inspected for more than 15% by X-ray film inspection, and the film evaluation shall be carried out in accordance with GB3323. The quality of the longitudinal welds shall not be less than Grade I, and the circumferential welds shall not be less than Grade II. 4.4.6.5 For all air bottles that belong to Grade 1 pressure vessels, the film evaluation of the butt joints shall be carried out in accordance with GB3323. The quality of the longitudinal welds shall not be less than Grade I, and the circumferential welds shall not be less than Grade II. 4.4.6.6 When the head is made of several pin plates, at least 10% X-ray film inspection shall be carried out before molding. After molding, 100% X-ray film inspection shall be carried out. Film evaluation shall be carried out in accordance with GB3323. The welding quality of the whole seam shall not be lower than Grade 1, and the welding quality of the circumferential seam shall not be lower than Grade II. 4.4.5.7 For air bottles that are partially inspected, the manufacturer shall still be responsible for the quality of the uninspected parts. 4.5 Heat treatment
4.5.1 Cold-formed heads must be subjected to normalizing heat treatment and non-destructive testing. 4.5.2 The following air bottles may be exempted from post-weld heat treatment: a) Air bottles of Class I pressure vessels shall be made of carbon steel, the thickness of the welded structure is less than 30mm and the working temperature is not greater than 150C; or carbon manganese steel is used, the thickness of the welded hook is less than 20mm and the working temperature is not greater than 150C; b) All air bottles of positive pressure vessels. 4.5.3 For air bottles that are to be subjected to overall heat treatment, if the overall heat treatment cannot be carried out due to conditions, segmented heat treatment is allowed, but it should be ensured that the entire length of the seam is subjected to heat treatment. 4.5.4 The temperature and holding time of heat treatment of air cylinders shall comply with the provisions of GB11038. 4.6 Bottle head valve
4.6.1 When designing the bottle head valve, the air inlet valve, air outlet valve, pressure gauge valve, drain valve, safety valve or fusible plug shall be assembled together as much as possible for easy operation.
4.6.2 When designing the bottle cap of the bottle head, it is allowed to use thick steel plates of the same grade as the cylinder instead. 5 Test method
5.1 Appearance and dimension inspection
5.1.1 Appearance inspection of welds
Use measuring tools and visual inspection to check the thickness of welds. The results shall comply with the provisions of 4.4.L.1~4.4.4.4. 5.1.2 Dimension inspection
Use measuring tools and daily measurement to inspect the length and misalignment of the head, cylinder and air cylinder. The results shall meet the requirements of 1.3.3, 4.3.4.4.3., 4.36 and 4.3.7.
5.2 Material inspection
5.2.1 Check the steel plate material against the material quality certificate, the result shall meet the requirements of 4.2.1, 5.2.2 Check the insert material against the material quality certificate, the result shall meet the requirements of 4.2.2. 5.3 Weld inspection
The butt weld of the air bottle shall be inspected in accordance with the provisions of GB3323, the result shall meet the requirements of 4.4.6.4, 4.4.6.5 and 4.4.6.6, 5.4 Welding test plate inspection
The welding test plate of the air bottle shall be inspected in accordance with the requirements of GB11038: the result shall meet the requirements of 4.4.5.4.4.6.2.4.4.6.3. 5.5 Liquid test
The hydraulic test of the air bottle body shall be carried out in accordance with GB11037, and the result shall meet the requirements of 4.1.5. 5.6 Air tightness test
The air bottle body shall be tested for air tightness only after it has passed the liquid creep test and the accessories have been installed. The air tightness test uses compressed air as the medium, the medium error is not less than 5, and the test pressure is the working pressure. During the test, the air bottle is immersed in water or the welds and other joints are coated with fertilizer 101 The material grade and thickness of the air cylinder test plate shall be the same as that of the cylinder, and the bevel of the test plate shall be in line with the groove of the cylinder weld.
4.4.5.2 The girth weld shall not be made into a thick test piece. If the cylinder has a girth weld or the girth weld is different from the cracking process, a girth weld mold test piece shall be welded.
4.4.5.3 The welding brush of the test plate shall be welded with the same method, process, heat treatment and the same welding rod, welding wire and flux as the product. The test plate shall be heat treated in the same furnace as the cylinder.
4.4.5.4 The product welding test plate shall be welded by the welder who welded the product, and the welder and inspector code shall be stamped after welding. 4.4.5.5 The selection of the required equipment of the air cylinder shall be carried out in accordance with the provisions of GB11C33. 4.4.5.6 The results of welding test of air cylinder products shall comply with the provisions of Table 4 of GB11038. 4.4.6 Nondestructive testing 4.4.5.1 Nondestructive testing specifications shall comply with the provisions of Table 8. 8 Nondestructive testing specifications Pressure vessel level X-ray penetration or flaw detection P≤1.57 At the same time 3≤16 and t,[502,8,t are all less than the level requirements, but P>1.51 or a≥16 or t≥15 100% inspection shall be carried out on the port seams of the test plate, and no less than 10% inspection shall be carried out on the screen seams of the product. For those that have not been inspected by radiography, 10% random inspection by magnetic field testing or latent penetration testing shall be carried out. CB/T493—1998 4.4.6.2 For air cylinders belonging to Class I pressure vessels, the test plates may be exempted from X-ray film inspection. The test plates of the first-class product shall be subjected to 100% X-ray film inspection as required for Class I pressure vessels. 4.4.6.3 For all low-pressure air bottles specified in GJB14.1A, 100% X-ray film inspection shall be carried out for the test drum. 4.4.6.4 For all medium and low-pressure air bottles specified in GJB14.1A, the longitudinal welds of the butt joints shall be inspected for more than 25% and the circumferential welds shall be inspected for more than 15% by X-ray film inspection, and the film evaluation shall be carried out in accordance with GB3323. The quality of the longitudinal welds shall not be less than Grade I, and the circumferential welds shall not be less than Grade II. 4.4.6.5 For all air bottles that belong to Grade 1 pressure vessels, the film evaluation of the butt joints shall be carried out in accordance with GB3323. The quality of the longitudinal welds shall not be less than Grade I, and the circumferential welds shall not be less than Grade II. 4.4.6.6 When the head is made of several pin plates, at least 10% X-ray film inspection shall be carried out before molding. After molding, 100% X-ray film inspection shall be carried out. Film evaluation shall be carried out in accordance with GB3323. The welding quality of the whole seam shall not be lower than Grade 1, and the welding quality of the circumferential seam shall not be lower than Grade II. 4.4.5.7 For air bottles that are partially inspected, the manufacturer shall still be responsible for the quality of the uninspected parts. 4.5 Heat treatment
4.5.1 Cold-formed heads must be subjected to normalizing heat treatment and non-destructive testing. 4.5.2 The following air bottles may be exempted from post-weld heat treatment: a) Air bottles of Class I pressure vessels shall be made of carbon steel, the thickness of the welded structure is less than 30mm and the working temperature is not greater than 150C; or carbon manganese steel is used, the thickness of the welded hook is less than 20mm and the working temperature is not greater than 150C; b) All air bottles of positive pressure vessels. 4.5.3 For air bottles that are to be subjected to overall heat treatment, if the overall heat treatment cannot be carried out due to conditions, segmented heat treatment is allowed, but it should be ensured that the entire length of the seam is subjected to heat treatment. 4.5.4 The temperature and holding time of heat treatment of air cylinders shall comply with the provisions of GB11038. 4.6 Bottle head valve
4.6.1 When designing the bottle head valve, the air inlet valve, air outlet valve, pressure gauge valve, drain valve, safety valve or fusible plug shall be assembled together as much as possible for easy operation.
4.6.2 When designing the bottle cap of the bottle head, it is allowed to use thick steel plates of the same grade as the cylinder instead. 5 Test method
5.1 Appearance and dimension inspection
5.1.1 Appearance inspection of welds
Use measuring tools and visual inspection to check the thickness of welds. The results shall comply with the provisions of 4.4.L.1~4.4.4.4. 5.1.2 Dimension inspection
Use measuring tools and daily measurement to inspect the length and misalignment of the head, cylinder and air cylinder. The results shall meet the requirements of 1.3.3, 4.3.4.4.3., 4.36 and 4.3.7.
5.2 Material inspection
5.2.1 Check the steel plate material against the material quality certificate, the result shall meet the requirements of 4.2.1, 5.2.2 Check the insert material against the material quality certificate, the result shall meet the requirements of 4.2.2. 5.3 Weld inspection
The butt weld of the air bottle shall be inspected in accordance with the provisions of GB3323, the result shall meet the requirements of 4.4.6.4, 4.4.6.5 and 4.4.6.6, 5.4 Welding test plate inspection
The welding test plate of the air bottle shall be inspected in accordance with the requirements of GB11038: the result shall meet the requirements of 4.4.5.4.4.6.2.4.4.6.3. 5.5 Liquid test
The hydraulic test of the air bottle body shall be carried out in accordance with GB11037, and the result shall meet the requirements of 4.1.5. 5.6 Air tightness test
The air bottle body shall be tested for air tightness only after it has passed the liquid creep test and the accessories have been installed. The air tightness test uses compressed air as the medium, the medium error is not less than 5, and the test pressure is the working pressure. During the test, the air bottle is immersed in water or the welds and other joints are coated with fertilizer 103 For air bottles that need to be heat treated as a whole, if the whole heat treatment cannot be carried out due to conditions, it is allowed to heat treat in sections, but the whole length of the coal seam should be heat treated. 4.5.4 The temperature and holding time of heat treatment of air bottles should be in accordance with the provisions of GB11038. 4.6 Bottle head valve
4.6.1 When designing the bottle head valve, the air inlet valve, air outlet valve, pressure gauge valve, drain valve, safety valve or fusible plug should be assembled together as much as possible for easy operation.
4.6.2 When designing the bottle cap of the bottle head, it is allowed to use thick steel plates of the same grade as the simplified Chinese character. 5 Test method
5.1 Appearance and dimension inspection
5.1.1 Appearance inspection of weld
Use measuring tools and visual inspection to check the thickness of the weld. The results should meet the requirements of 4.4.L.1~4.4.4.4. 5.1.2 Dimension inspection
Use measuring tools and daily measurement method to inspect the length and misalignment of the head, cylinder and air bottle. The results should meet the requirements of 1.3.3, 4.3.4.4.3., 4.36 and 4.3.7.
5.2 Material inspection
5.2.1 Check the steel plate material against the material quality certificate. The result should meet the requirements of 4.2.1. 5.2.2 Check the insert material against the material quality certificate. The result should meet the requirements of 4.2.2. 5.3 Weld inspection
The butt weld of the air bottle shall be inspected in accordance with the provisions of GB3323, and the results shall comply with the provisions of 4.4.6.4, 4.4.6.5 and 4.4.6.6. 5.4 Welding test plate inspection
The welding test plate of the air bottle shall be inspected in accordance with the requirements of GB11038: the results shall comply with the requirements of 4.4.5.4.4.6.2.4. 4.6.3. 5.5 Liquid test
The hydraulic test of the air bottle body shall be carried out in accordance with GB11037, and the results shall comply with the requirements of 4.1.5. 5.6 Air tightness test
The air bottle body shall be tested for air tightness only after it has passed the liquid creep test and the accessories have been installed. The air tightness test uses compressed air as the medium, the medium error is not less than 5, and the test pressure is the working pressure. During the test, the air bottle is immersed in water or the welds and other joints are coated with fertilizer 103 For air bottles that need to be heat treated as a whole, if the whole heat treatment cannot be carried out due to conditions, it is allowed to heat treat in sections, but the whole length of the coal seam should be heat treated. 4.5.4 The temperature and holding time of heat treatment of air bottles should be in accordance with the provisions of GB11038. 4.6 Bottle head valve
4.6.1 When designing the bottle head valve, the air inlet valve, air outlet valve, pressure gauge valve, drain valve, safety valve or fusible plug should be assembled together as much as possible for easy operation.
4.6.2 When designing the bottle cap of the bottle head, it is allowed to use thick steel plates of the same grade as the simplified Chinese character. 5 Test method
5.1 Appearance and dimension inspection
5.1.1 Appearance inspection of weld
Use measuring tools and visual inspection to check the thickness of the weld. The results should meet the requirements of 4.4.L.1~4.4.4.4. 5.1.2 Dimension inspection
Use measuring tools and daily measurement method to inspect the length and misalignment of the head, cylinder and air bottle. The results should meet the requirements of 1.3.3, 4.3.4.4.3., 4.36 and 4.3.7.
5.2 Material inspection
5.2.1 Check the steel plate material against the material quality certificate. The result should meet the requirements of 4.2.1. 5.2.2 Check the insert material against the material quality certificate. The result should meet the requirements of 4.2.2. 5.3 Weld inspection
The butt weld of the air bottle shall be inspected in accordance with the provisions of GB3323, and the results shall comply with the provisions of 4.4.6.4, 4.4.6.5 and 4.4.6.6. 5.4 Welding test plate inspection
The welding test plate of the air bottle shall be inspected in accordance with the requirements of GB11038: the results shall comply with the requirements of 4.4.5.4.4.6.2.4. 4.6.3. 5.5 Liquid test
The hydraulic test of the air bottle body shall be carried out in accordance with GB11037, and the results shall comply with the requirements of 4.1.5. 5.6 Air tightness test
The air bottle body shall be tested for air tightness only after it has passed the liquid creep test and the accessories have been installed. The air tightness test uses compressed air as the medium, the medium error is not less than 5, and the test pressure is the working pressure. During the test, the air bottle is immersed in water or the welds and other joints are coated with fertilizer 10
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.