Some standard content:
GB19158—2003
This standard is formulated after referring to the relevant national natural gas standard data and combining the production and use of station-used compressed natural gas cylinders.
Station-used cylinders are fixed-use cylinders, which are different from other cylinders. This standard puts forward the following requirements for station-used cylinders: nominal working pressure 25MPa; design temperature ≤60℃; volume series and diameter series are continuous; material eliminates manganese steel, and chromium-molybdenum steel is used in all cases, and specific steel types are specified; the design of the cylinder body is carried out in accordance with GB150-1998 "Steel Pressure Vessels"; an upper limit is imposed on the tensile strength; the volume deformation rate of the burst test is cancelled; the burst safety factor is revised; and the pressure and number of fatigue tests are changed. References of this standard: GB150-1998 "Steel Pressure Vessels"; GB5099--1994 "Steel Seamless Gas Cylinders"; GB172581998 "Compressed Natural Gas Cylinders for Automobiles"; US Federal Regulations Chapter 49 517.304 "Compressed Natural Gas Fuel Container Integrity" (1996); DOT Exemption Order E8009, the former Ministry of Machinery and Electronics General Machinery Industry Internal Standard JB/TQ814-89 "Compressed Natural Gas High-Pressure Cylinders for Automobiles". Appendix A of this standard is the appendix of the standard.
This standard was proposed and managed by the National Technical Committee for Standardization of Gas Cylinders. This standard was drafted by Beijing Tianhai Industrial Co., Ltd. The main drafters of this standard are: Hu Chuanzhong, Zhou Haicheng, Wu Yan. 1 Scope
National Standard of the People's Republic of China
Compressed Natural Gas Steel Cylinders for Stations
Steel Cylinders for the Storage of Compressed Natural GasGB 19158—2003
This standard specifies the types and parameters, technical requirements, test methods, inspection rules, marking, coating, packaging, transportation and storage of gas cylinders (hereinafter referred to as cylinders) used in compressed natural gas filling stations. This standard is applicable to the design and manufacture of steel cylinders with a nominal working pressure of 25MPa (the pressure in this standard refers to the gauge pressure), a nominal volume of 50 to 200L, and a design temperature of ≤60℃.
Steel cylinders manufactured in accordance with this standard are only allowed to be filled with natural gas that complies with GB18047--2000 "Compressed Natural Gas for Vehicles". 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB/T222-1984 Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GB/T223.1-1981 Determination of carbon content in steel and alloys GB/T 223.2-1981 Determination of sulfur content in steel and alloys GB/T 223.3-1988 GB/T 223.4-1988 GB/T 223.5-1997 Chemical analysis methods for steel and alloys Determination of phosphorus content by des-diantipyrylmethane phosphomolybdic acid gravimetric method Chemical analysis methods for steel and alloys Determination of manganese content by ammonium nitrate oxidation volumetric method Chemical analysis methods for steel and alloys Determination of acid-soluble silicon content by reduced silicomolybdate photometric method GB/T 223.6—1994
Methods for chemical analysis of iron, steel and alloy
Determination of boron content by deneutralization titration
GB/T 224—1987
Method for determination of depth of decarburized layer in steel
GB/T 226—1991
GB/T 228--2002
GB/T 229--1994
GB/T 230--1991
Method for acid etching examination of macrostructure and defects in steel
Method for tensile testing of metals
Method for Charpy notched impact testing of metals
Method for Rockwell hardness testing of metals
GB/T 231. 1--2002
GB/T 231. 2--2002
GB/T 231.3—2002
Metal Brinell hardness test Part 1: Test methodMetal Brinell hardness test Part 2: Verification of hardness testerMetal Brinell hardness test Part 3: Calibration of standard hardness blockGB/T232—1999Methods for bending test of metallic materialsGB/T 1172—1999
9Conversion value of hardness and strength of ferrous metals
GB/T 1979—2001
Structural steel macrostructure defect rating chart
GB/T 3077—1999
Alloy structural steel
GB/T5777—1996Ultrasonic flaw detection method for seamless steel pipe9Color marking of gas cylinders
GB 7144—1999
GB 8335—1998
3Special thread for gas cylinders
Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on 2003-05-23 and implemented on 2003-11-01
GB/T 83361998
GB/T 9251—1997
GB/T 9252—2001
Special thread gauge for gas cylinders
Method for hydrostatic test of gas cylinders
Method for fatigue test of gas cylinders
GB/T 12137---2002
Method for air tightness test of gas cylinders
GB/T 12606--1999
GB/T 13298--1991
GB/T 13299—1991
GB/T 13440—1992
GB 15385—1994
GB 18047--2000
GB 18248—2000
Magnetic flux leakage detection method for steel pipe
19158—2003
Method for metal microstructure inspection
Method for evaluating steel microstructure
Flattening test method for seamless gas cylinder
Hydraulic pressure bursting test method for gas cylinder
Compressed natural gas for vehicles
Seamless steel pipe for gas cylinder
JB4730—1994Nondestructive testing of pressure vesselsYB/T5148-—1993Method for determining average grain size of metals3 Terms and symbols
This standard adopts the following definitions.
3.1 Nominal working pressure
The limited filling pressure of the cylinder at the reference temperature (20℃). 3.2 Yield stress
can be used for tensile test of material specimens. If there is obvious yield phenomenon, the yield point or the next yield point shall be taken; if there is no obvious yield phenomenon, the yield strength shall be taken. 3.3 Measured tensile strength
The actual tensile strength value measured in accordance with 6.3.2 of this standard. 3.4 Batch
refers to the limited number of steel cylinders that adopt the same design conditions, have the same nominal diameter, design wall thickness, length variation not exceeding 50%, are made of the same furnace steel, the same manufacturing method, and are continuously heat treated according to the same heat treatment specification; if a box furnace or a pit furnace is used for heat treatment, it refers to the limited number of each furnace. 3.5 Design temperature
The maximum operating temperature of the steel cylinder used to determine the design pressure. 3.6 The design pressure
shall not be lower than the maximum temperature rise pressure reached by the medium in the steel cylinder at the design temperature. 3.7 Symbols
-Outer diameter of cylinder, mm;
D--Bending center diameter of cold bending test, mm;
Pa--Design pressure, MPa;
-Hydraulic pressure test pressure, MPa;
-Design wall thickness of cylinder, mm;
Average wall thickness of cylinder measured, mm;
Spacing between pressure heads in flattening test, mm;
Nominal water volume, L;
ao-Original thickness of arcuate flat specimen, mm; b.-Original width of flat specimen, mm;
d-Circumferential tear width of rupture, mm;
l-Original gauge length of specimen, mm;
-Impact toughness value, J/cm
sElongation, %;
19158—2003
o. — Guaranteed yield stress value of the bottle body material after heat treatment, N/mm2Qea——Measured yield stress value, N/mm2;as-Guaranteed tensile strength value of the bottle body material after heat treatment, N/mm2;Obe
-Measured tensile strength value, N/mm2.
Type and parameters
The structure of the steel bottle body should generally conform to the type shown in Figure 1. 4.1
Figure 1 Steel Cylinder Body Structure Type
4.2 The nominal working pressure of the steel cylinder shall be 25MPa. The nominal water volume and nominal outer diameter shall generally comply with the provisions of Table 1. Table 1 Nominal water volume and nominal outer diameter of steel cylinder Item
Nominal water volume V/L
Nominal outer diameter D /mmbzxz.net
4.3 The model of the steel cylinder consists of the following parts:
50~200
229~~406
Nominal working pressure, MPa
Nominal water volume, L
Nominal outer diameter, mm
Compressed natural gas cylinder for station
Allowable deviation/%
Model example: The steel cylinder with a nominal working pressure of 25MPa, a nominal water volume of 80L and a nominal outer diameter of 279mm is marked as \ZTP279-80-25".
5 Technical requirements
5.1 General provisions for cylinder body materials
5.1.1 The cylinder body material should be non-aging killed steel smelted in basic open-hearth furnace, electric furnace or oxygen-blown basic converter. .1.2 The steel type should be high-quality chromium-molybdenum steel seamless steel pipe, the material grade is 30CrMo, and it should comply with the provisions of GB/T3077, among which S and P should comply with the provisions of Table 2, and the allowable deviation of chemical composition should comply with the provisions of GB/T222. 5.1.3 The cylinder material should have a quality certificate. The cylinder manufacturer should conduct various verification analyses according to the furnace number. 5.1.4 The bottle body material should have good low-temperature impact resistance. 3
5.2 Seamless steel pipe
or N5.
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Table 2 S and P element content of bottle body material
The shape tolerance of the steel pipe should not be less than the provisions of GB18248. The wall thickness deviation of the steel pipe should not exceed 22.5% of the minimum wall thickness. S+P||tt| |The steel pipes shall be delivered by the steel mill after flaw detection one by one. The flaw detection shall be carried out in accordance with GB/T5777 or GB/T12606, and the qualified level shall be C55.3 Design
5.3.1 General provisions
The water pressure test pressure of the steel cylinder shall be 1.5 times the nominal working pressure. 5.3.1.1
5.3.1.2 When determining the design wall thickness value of the cylinder for steel cylinder design, the selected yield stress shall not be greater than 85% of the minimum tensile strength. 5.3.1.3 The actual tensile strength of the material shall be limited. The actual tensile strength of the cylinder body material shall not be greater than 880N/mm2. The pressure on which the design of the steel cylinder is based shall be the design pressure. Generally, the temperature rise pressure at 60°C shall be taken as the design pressure; however, if 5.3.1.4
the station adopts Sunshade measures and provide specific maximum operating temperature data, the design pressure can also be determined based on this data. 5.3.2 The design wall thickness of the cylinder is calculated according to formula (1) S
and should also meet the requirements of formula (2):
5.3.3 End structure
5.3.3.1 End structure type
With bottle mouth hemispherical, see Figure 2.
PaD.
Figure 2 End structure type diagram
5.3.3.2 The thickness of the bottle mouth should ensure sufficient strength and ensure that it will not deform when subjected to the torque of the tightening valve. (1)
（2）)
5.3.3.3 The tooth type, size and tolerance of the internal thread of the bottle mouth shall comply with the provisions of GB8335 or other relevant standards. The thread matching between the bottle valve and the bottle mouth should ensure that 2 to 5 pitch threads are left after the bottle valve is assembled. 5.3.4 Bottle valve
GB19158--2003
5.3.4.1 The bottle valve should be equipped with a safety pressure relief device, which should be a bursting disc-fusible plug combination. The bursting pressure of the bursting disc is generally 0.95 to 1.0 times the design pressure. The operating temperature of the fusible plug is 100℃±5℃. 5.3.4.2 The safety pressure relief device on the bottle valve should meet the requirements of relevant standards. 5.3.4.3 The manufacturer's name or code, weight, nominal working pressure and purpose should be marked on the bottle valve. For example: M (manufacturer code), W (weight), P (nominal working pressure), CNG (purpose). 5.4 Manufacturing
5.4.1 General provisions
5.4.1.1 The manufacturing of steel cylinders shall comply with the provisions of this standard and the provisions of product drawings and technical documents. 5.4.1.2 The manufacturing method of the cylinder body should be: using seamless steel pipe as raw material and spinning. 5.4.1.3 The manufacturing of steel cylinders should be batched under continuous heat treatment conditions, with no more than 502 pieces for 100L or less (including 100L) as a batch, and no more than 202 pieces for 100L or more as a batch; if a box furnace or a pit furnace is used for heat treatment, batch inspection should be carried out with the furnace as the batch. For steel cylinders above 100L, the heat treatment specimen is allowed to be replaced by a test ring with a length of not less than 400mm. The test ring should be made of the same batch number material as the steel cylinder, and should be heat treated at the same time as the steel cylinder using the same heat treatment process. 5.4.1.4 The process of seamless steel pipe closing should be subject to process evaluation. 5.4.2 Heat treatment
5.4.2.1 Steel cylinders should be subjected to quenching and tempering heat treatment, and the heat treatment should be carried out according to the qualified heat treatment process. 5.4.2.2 The quenching temperature should not be greater than 930℃, and the tempering temperature should not be less than 538℃. 5.4.2.3 It is not allowed to quench in water without additives. When water plus additives are used as the quenching medium, the cooling rate of the bottle in the medium should not be greater than 80% of the cooling rate in 20℃ water. 5.4.2.4 After heat treatment, the bottle body should be shot peened, non-destructively tested and hardness tested one by one. 6 Test methods
6.1 Verification of technical indicators of bottle body materials
6.1.1 Chemical composition: It should be carried out according to GB/T222 and GB/T223.1~~223.6 based on the furnace number of the material. 6.1.2 Macrostructure: It should be carried out according to GB/T226 based on the furnace number of the material. The evaluation of macrostructure should comply with the provisions of GB/T1979. 6.2 The manufacturing tolerance of the bottle body should be checked with a standard or special gauge sample. The thickness of the bottle body should be checked with a thickness gauge, and the inner and outer surfaces of the bottle body should be polished with special tools.
6.3 Determination of various performance indicators after heat treatment of the bottle body 6.3.1 Sampling
a) The sampling position is shown in Figure 3;
b) The sample should be cut longitudinally from the middle of the cylinder or the test ring, and a real flat sample should be used; c)
The number of samples: no less than 2 tensile test specimens, no less than 3 impact test specimens, and no less than 4 cold bending test specimens. Tensile test
The measurement items of the tensile test should include: tensile strength, yield stress, and elongation; b) The shape of the tensile specimen preparation is shown in Figure 4;
The general requirements for the shape and size of the tensile specimen shall be implemented in accordance with GB/T228; c)
The tensile test method shall be implemented in accordance with GB/T228.
Impact test
Specimens with a size of 5mm×10mm×55mm and a V-notch shall be used as standard specimens; a)
The shape, size and deviation of the specimens shall be in accordance with GB/T229; the impact test method shall be in accordance with GB/T229.
6.3.4 Cold bending test
19158—2003
Tensile specimens (2 pieces)
Cold bending specimens (4 pieces)
Test sampling location diagram
bg<4ao
bo< D./ 8
Figure 4 Tensile specimen diagram
a) The location for specimen cutting is shown in Figure 3. The ring should be cut horizontally from the cylinder of the tensile specimen by mechanical method; Impact specimens (3 pieces)
b) The width of the ring should be 4 times the wall thickness of the bottle body and not less than 25mm. It is divided into four equal strips. Randomly select a specimen for side processing. The surface roughness is not less than 12.5μm and the fillet radius is not more than 2mm; c) The specimen preparation and cold bending test method shall be carried out in accordance with GB/T232. The specimen is bent according to Figure 5. αDr+2Sa
Figure 5 Schematic diagram of cold bending test
6.3.5 Flattening test
6.3.5.1 The flattening test shall be carried out in accordance with GB/T13440. a) Place the middle of the bottle body between two pressure heads with a vertex angle of 60° and a radius of 13mm perpendicular to the axis of the bottle body, apply pressure to the bottle body at a speed of 20-50mm/min, and measure the pressure head spacing T under the load; b) The length of the pressure head should not be less than the width of the bottle body that has been flattened, see Figure 6.6
19158—2003
a) Pressure head
b) Flattening
Figure 6 Schematic diagram of flattening test
6.4 The hardness determination method shall be carried out in accordance with GB/T230 or GB/T231.1~231.3. The hardness and strength conversion values shall be in accordance with GB/T1172.6.5 Metallographic test
Metallographic specimens shall be cut from the body of the tensile test. The preparation, size and method of the specimens shall be in accordance with GB/T13298; the grain size shall be in accordance with YB/T5148;
The depth of decarburized layer shall be in accordance with GB/T224;
The evaluation of banded structure and Widmanstatten structure shall be in accordance with GB/T13299. 5 Nondestructive testing shall be in accordance with JB4730. Nondestructive testing shall use magnetic particle testing or ultrasonic testing methods. 6.6
Visually inspect and use a standard plug gauge in accordance with GB/T?8336 to check the internal thread of the bottle mouth. : Burst test
It shall be carried out when the cylinder volume is ≤100L. The burst test shall be carried out in accordance with GB15385. a)
There shall be no gas in the test pipeline;
The pressure increase speed shall not exceed 0.5MPa/s;
Measure the service pressure value of the cylinder during the test; measure the total pressure of water from the beginning to the moment of cylinder explosion, and draw a pressure-water inflow curve.
6.9 The water pressure test shall be carried out in accordance with GB/T9251.
6.10 The air tightness test shall be carried out in accordance with GB/T12137. 6.11 Fatigue test
It shall be carried out when the cylinder volume is ≤100L. The fatigue test shall be carried out in accordance with GB/T9252. 7 Inspection rules
7.1 Permissible manufacturing tolerance of the cylinder
7.1.1 The wall thickness deviation of the cylinder shall not exceed 22.5% of the designed wall thickness. 7.1.2 The manufacturing tolerance of the outer diameter of the cylinder shall not exceed ±1% of the designed value. 7.1.3 The roundness of the cylinder, the difference between the maximum and minimum outer diameters measured on the same section, shall not exceed 2% of the average outer diameter of the section. GB
19158—2003
7.1.4 The straightness of the cylinder shall not exceed 2% of the length of the cylinder. 7.1.5 The manufacturing tolerance of the height of the cylinder shall not exceed ±20mm. 7.2 Appearance requirements of the bottle body
7.2.1 The inner and outer surfaces of the bottle body shall be smooth and round, and there shall be no visible cracks, folds, heavy skin, inclusions and other defects that affect the strength; local smooth depressions caused by the shedding of oxide scale and slight marks after grinding are allowed, but the designed wall thickness of the cylinder must be guaranteed. 7.2.2 The transition between the bottle shoulder and the cylinder must be smooth; no groove marks are allowed on the bottle shoulder. 7.3 Internal thread of the bottle mouth
7.3.1 The tooth type, size and tolerance of the thread shall comply with the provisions of GB8335 or other relevant standards. 7.3.2 The thread is not allowed to have inverted teeth, flat teeth, double teeth, flat bottom teeth, tooth tips, tooth width, and obvious ripples on the thread surface. 7.3.3 The number of effective pitches from the base of the bottle mouth shall not be less than 8. 7.3.4 The axial variation of the thread base position is +1.5 mm. Mechanical property test
The mechanical properties of the bottle body after heat treatment shall comply with the requirements of Table 3 Table 3 Mechanical properties of the bottle body
Heat treatment state
Test items
a./(N/mm2)
α/(N/mm2)
V-notch specimen section/mm
ak/(J/cm2)
7.5 Hardness test
Test temperature/℃
Average value
Minimum value of a single specimen
The hardness value of the bottle body after heat treatment shall meet the requirements of the material strength value. 7.6 Cold bending and flattening test
Tempering treatment after fire
Guaranteed value of heat treatment by steel cylinder manufacturer
≥Guaranteed value of heat treatment by steel cylinder manufacturer
7.6.1 The cold bending test and flattening test are qualified if there is no crack. The requirements for the bending center diameter and the pressure head spacing shall comply with the provisions of Table 4. Table 4 Requirements for the bending center diameter and pressure head spacing of cold bending test and flattening test Actual tensile strength value of steel cylinder
Oba/MPa
>580～685
>685~784
>784~880
Bending center diameter D
7.6.2 If the actual measured value of tensile strength exceeds the guaranteed value by 10%, the flattening test shall be used instead of the cold bending test. 7.7 Metallographic structure inspection
7.7.1 The bottle body structure shall be tempered troostite. 7.7.2 Decarburization depth of the bottle body: the outer wall shall not exceed 0.3mm; the inner wall shall not exceed 0.25mm. 7.8 Water pressure test
Pressure head penetration distance T
7.8.1 Carry out water pressure test according to the requirements of 5.3.1.1 and 6.9. Within 1 minute of pressure maintenance, the pressure gauge pointer shall not drop back, and the volume residual deformation rate shall not be greater than 3%. Bottle leakage or obvious deformation shall be unqualified. 8
7.8.2 After the water pressure test, the inside of the cylinder shall be dried. 7.9 Air tightness test
7.9.1 The air tightness test pressure is the nominal working pressure. GB19158-2003
7.9.2 Carry out air tightness test according to the requirements of 6.10. If the bottle body leaks during the test, it is unqualified. If the bottle mouth leaks due to loose assembly, it is allowed to be repaired and retested.
7.10 Burst test (conducted when volume ≤ 100L)7.10.1 The actual burst pressure shall not be less than 3.0 times the design pressure. 7.10.2 The ratio of the measured service pressure to the burst pressure shall be close to the ratio of the measured yield stress to the tensile strength of the bottle material. 7.10.3 There shall be no fragments after the bottle is burst, and the rupture must be on the cylinder. The shape and size of the rupture on the bottle shall comply with the provisions of Figure 7. dD/4
Figure 7 Schematic diagram of rupture shape and size
7.10.4 The main rupture of the bottle shall be plastic fracture, that is, the edge of the fracture shall have obvious shear lips, and there shall be no obvious metal defects on the fracture; the rupture crack shall not extend more than 20% of the height of the bottle shoulder. 7.11 Nondestructive testing
Nondestructive testing should be carried out on the cylinder body after heat treatment. Magnetic particle testing (Type A high sensitivity test piece) or ultrasonic testing should be used for nondestructive testing. No cracks or crack defects should be found. According to JB4730, the qualified standard is Class I. 7.12 Factory inspection
7.12.1 Unit-by-unit inspection
All cylinders leaving the factory should be inspected one by one according to the items specified in Table 5. 7.12.2 Batch inspection
All cylinders leaving the factory should be inspected in batches according to the provisions of Table 5. 7.12.3 Sampling rules
According to the requirements of 5.4.1.3, two cylinders with a volume of ≤100L should be randomly selected for various performance measurements. 7.12.4 Re-inspection rules
a) If the test results of the sampled bottles do not meet the specified requirements, the unqualified items shall be doubled for re-inspection; if the re-inspection results meet the requirements, they shall be considered qualified; if the re-inspection is still unqualified and the unqualified is caused by heat treatment, the batch of cylinders shall be allowed to be re-heat treated. b) The batch of cylinders that have been repeatedly heat treated shall be treated as a new batch and shall be re-inspected in batches; c) The number, reason and conclusion of the cylinders that have been repeatedly heat treated shall be stated in the quality inspection record. d) The number of repeated heat treatments shall not exceed two times. 7.13 Type test
Cylinder manufacturing shall be subject to type test in any of the following situations. a) Newly designed cylinders;
b) Cylinders produced with changed cylinder diameter and designed wall thickness; c) Cylinders produced with a change in the minimum guaranteed yield stress value exceeding 60N/mm2. 7.13.1 Type test items shall be as specified in Table 5. 9
7.13.2 Fatigue test
19158—2003
7.13.2.1 When the cylinder volume is ≤100L, the test method shall be carried out in accordance with 6.11; when it is greater than 100L, the fatigue life calculation shall be carried out in accordance with GB150. 7.13.2.2 Qualification standard: 60,000 cycles (the upper limit of pressure is the design pressure) without damage is qualified. 7.13.3 Sampling rules
7.13.3.1 All items specified in Table 5 for inspection shall be inspected one by one. 7.13.3.2 For all items specified in Table 5 for batch inspection, the number of samples for each batch shall not be less than 2 for inspection. The cylinder manufacturer shall select 3 cylinders representative of the test purpose for fatigue test. 7.13.3.3
If the type test conducted in accordance with 7.13 fails, the product shall not be put into mass production or use. 7.13.4
Table 5 Inspection Items
Inspection Items
Bottle Wall Thickness
Bottle Manufacturing Tolerance
Bottle Interior and Appearance
Tensile Test
Impact Test
Cold Bending Test
Flattening Test
Hardness Test
Metallographic Structure
Non-destructive Testing
Internal Thread of Bottle Mouth
Hydraulic Pressure Test
Air Tightness Test
Explosion Test“
Fatigue Test”
Test Method
Factory Inspection
Inspection One by One
Batch Inspection
Note: For 4, 5, 6 and 7, when the cylinder volume is greater than 100L, test rings can be used instead of each test. Water
Only when the cylinder volume is ≤100L.
8 Marking, coating, packaging, transportation, storage 8.1 Marking
8.1.1 Steel stamp mark
8.1.1.1 Each cylinder should generally be stamped on the shoulder of the bottle according to the items and positions shown in Figure 8. Type test
Judgment basis
8.1.1.2 The steel stamp marks on the cylinder can also be arranged along the circumference of the bottle shoulder. The arrangement of each item may not be in the order of the guide numbers in Figure 8, but the items are indispensable.
8.1.1.3 The steel stamp must be obvious, complete and clear. 8.1.1.4 The height of the steel stamp font shall not be less than 8mm, and the depth of the steel stamp font shall be 0.3~0.5mm. 8.1.1.5 The steel stamp mark of the volume is the nominal volume, and the steel stamp mark of the bottle weight shall retain a decimal place. For example: the measured value of the bottle weight is 90.675, and the bottle weight should be expressed as 90.7. 10
8.1.2 Color marking
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0-Manufacturer's inspection mark; 1-Cylinder manufacturer code, 2-Cylinder number, 3-Hydraulic test pressure; 4-Nominal working pressure, MP&z5-Measured weight, kg6-Nominal volume, L; 7-Bottle body design wall thickness, mmz8-Manufacturing year and month; 9-Safety Supervision Department's inspection mark, 10-Compressed natural gas abbreviation in English letters, 11 Product standard number, 12-Cylinder manufacturing unit license number Figure 8 Schematic diagram of cylinder steel stamp mark
The color of the cylinder is brown, the word is "Natural Gas", the color of the word is red, and the rest shall refer to GB7144. 8.2 Coating
8.2.1 Before coating, the surface of the cylinder should be cleaned of oil, rust and other debris, and the coating can only be applied under dry conditions. 8.2.2 The coating should be uniform and firm, and there should be no defects such as bubbles, paint marks, cracks and peeling. 8.3 Packaging
According to the user's requirements, if the cylinder is shipped without a bottle valve, the bottle mouth should be sealed with reliable measures to prevent standing pollution. It can be shipped in bundles, containers or bulk.
8.4 Transportation
8.4.1 The transportation of cylinders should comply with the regulations of the transportation department. 8.4.2 During transportation and loading and unloading, the cylinders should be protected from collision, moisture and damage to accessories. 8.5 Storage
8.5.1 Cylinders should be stored neatly and classified. If stacking is adopted, the height should be limited to prevent damage. 8.5.2 If the cylinder is stored for more than 6 months before leaving the factory, reliable moisture-proof measures should be taken. 9 Installation
In addition to complying with the relevant national (industry) standards and relevant regulations on gas cylinder safety supervision, the installation and use of cylinders should also be installed according to the installation instructions; when cylinders are used horizontally, each cylinder should be equipped with a drain pipe, and one end of the pipe inside the cylinder should be located at the lowest point of the cylinder.
10 Product certificate and batch inspection quality certificate 10.1 Each cylinder leaving the factory should be accompanied by a product certificate, and the user should be provided with an instruction manual (including installation instructions). 10. 2 Requirements for factory certificates
Name of cylinder manufacturer;
Cylinder number;
Hydraulic pressure test pressure;
Nominal working pressure;
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