Some standard content:
GB/T3864-1996
This standard is a revision of GB/T3864-83 "Industrial Gaseous Nitrogen". Superior products are equivalent to the first-grade specifications in OCTT9293-74, and second-grade and qualified products are superior to the second-grade and third-grade specifications in this standard. When revising GB/T3864-83, the main technical contents of GB/T3864-83 were retained, but the scope of application was expanded to include liquid nitrogen, and the technical contents of sampling, packaging, storage and transportation of liquid nitrogen were added; the technical requirements were changed from the original two categories to the classification of superior products, first-class products and qualified products, and the indicators were adjusted accordingly; the analysis method of oxygen content adopts chemical absorption method or gas chromatography, the two methods are parallel and have equal effectiveness, but the minimum graduation value at the lower end of the gas tube in the absorption method is changed to 0.1mL; the determination of free water retains the inversion method, and the determination of water vapor content is added, namely, electrolysis method or dew point method, the two methods are parallel; the compression coefficient table of bottled gaseous nitrogen and the corresponding pressure table at different temperatures are deleted from the product packaging, and the nitrogen volume conversion coefficient k value table is directly given instead, the volume calculation formula of liquid nitrogen is added, and the reference standards are added.
This standard replaces GB/T3864-83 from the date of implementation. Appendix A of this standard is the standard appendix, and Appendix B is the indicative appendix. This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Southwest Chemical Research Institute of the Ministry of Chemical Industry. Drafting units of this standard: Southwest Chemical Research Institute of the Ministry of Chemical Industry, Beijing Praxair Practical Gas Co., Ltd. Main drafters of this standard: He Daoshan, Zhou Pengyun, Zhou Wenhui. 139
1 Scope
National Standard of the People's Republic of China
Industrial nitrogen
Industrial nitrogen
GB/T 3864--1996
Replaces GB/T3864-—83
This standard specifies the technical requirements, inspection methods, packaging, marking, etc. of industrial nitrogen products. This standard applies to gaseous nitrogen or liquid nitrogen produced by air separation. It is chemically inactive and non-flammable. It is an asphyxiating gas and is mainly used as a protective gas. Molecular formula: N2.
Relative molecular mass: 28.0134 (according to the 1991 international relative atomic mass). 2. Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB190---90 Dangerous goods packaging mark
GB5099-85 Seamless steel gas cylinders
GB/T5274-85 Preparation of mixed gases for gas analysis calibration Weighing method Determination of trace moisture in gas Electrolytic method
GB/T 5832.1--86
Determination of trace moisture in gas
GB/T 5832.2--86
Dew point method
GB7144-86 Color marking of gas cylinders
GB/T10626-89 Standard mixed gas for gas analysis Preparation certificate of mixture
GB 14193-93
Regulations for filling liquefied gas cylinders
, Regulations for filling permanent gas cylinders
GB 14194---93
JB/T 5905-92
JB/T 6897-
JB/T 689893
3 Requirements
Vacuum multi-layer insulation
Cryogenic liquid container
Cryogenic liquid tank truck
Cryogenic liquid storage equipment
The technical indicators of industrial nitrogen shall comply with the requirements of Table 1. Item
Nitrogen purity, 10-2 (V/V)
Oxygen content, 10-(V/V)
Approved by the State Bureau of Technical Supervision on December 2, 1996 110
Safety specification for use
Table 1 Technical indicators
Superior products
First-class products
Qualified products
Implemented on May 1, 1997
Free water, mL/bottle
Dew point, ℃
Note: Liquid nitrogen does not specify moisture indicators
Test method
4.1 Sampling
GB/T 3864—1996
Table 1 (end)
Superior products
First-class products
Qualified products
Bottled industrial nitrogen is sampled by batch. Randomly select 2% of the samples from each batch for inspection. When the batch is less than 100 bottles, the number of samples shall not be less than 2 bottles, and when it is more than 200 bottles, the number of samples shall not be less than 5 bottles. When the inspection result shows that one bottle does not meet any requirement of this standard, the same batch of products shall be doubled for re-sampling and inspection. If there are still bottles that do not meet any requirement of this standard, the batch of products shall be unqualified. Liquid nitrogen is sampled from the liquid phase of each filling container. If one of the indicators in the inspection result does not meet the requirements of this standard, the product shall be unqualified. For pipeline transport of nitrogen, sampling and inspection shall be carried out at least once within 4 hours. When any of the indicators in the inspection result does not meet the requirements of this standard, the products within the 4 hours shall be unqualified.
4.2 Nitrogen purity
Nitrogen purity is calculated according to formula (1):
100—
Wherein: Nitrogen purity, 10-2 (V/V)
—Oxygen content, 10-2 (V/V).
4.3 Determination of oxygen content
The oxygen content is determined by chemical absorption or gas chromatography, both of which are equally effective. 4.3.1 Chemical absorption method
4.3.1.1 Method and principle
The oxygen in the sample nitrogen is absorbed by the pyrogallic acid alkaline solution, and the oxygen content is determined based on the reduction in the volume of the sample gas. 4.3.1.2 Reagents and solutions
Pyrogallic acid: analytical grade;
Potassium hydroxide: analytical grade;
Sulfuric acid: chemically pure 5×10-2 (m/m) aqueous solution; Methyl orange: analytical grade, 1.0×10-3 (m/m) aqueous solution; Liquid paraffin;
Distilled water;
Sodium chloride: chemically pure, saturated solution;
Absorption solution: Weigh 60g potassium hydroxide, dissolve in 40mL distilled water, and cool to room temperature. Weigh more than 20g pyrogallic acid, dissolve in 100mL distilled water. Mix the above two solutions evenly; Sealing solution: Add 5×10-2 sulfuric acid and 1.0×10-3 methyl orange 3 to 5 drops to the saturated sodium chloride solution. 4.3.1.3 Instruments
Oswald gas analyzer, the measuring device is shown in Figure 1, the minimum graduation value at the lower end of the gas measuring tube is not greater than 0.1mL. The processing diagram is shown in Figure 2.
4.3.1.4 Preparation
GB/T3864--1996
Gas measuring tube; 2—casing tube, 3 absorption bottle: 4—level bottle Figure 1 Ostwald gas analyzer
UmL mark
50mL mark
98mL mark
99mL mark
100ml mark
Basic requirements: a) The minimum scale of 50~98 is 0.2mL, and the engraving is 50, 52, 54. b) The minimum scale of 98~100 is 0.1mL, and the engraving is 98, 99, 100 Figure 2 Gas measuring tube of Ostwald gas analyzer
Clean and dry the instrument piston, and apply a small amount of piston grease. Fill the absorption bottle with pyrogallic acid alkaline solution and seal the liquid surface exposed to air with an appropriate amount of liquid paraffin. Place a gas measuring tube in the casing and fill the casing with room temperature water. After connecting the instrument docking part with a rubber tube, add the sealing liquid from the level bottle.
Use the following method to check the air tightness of the instrument: fill the gas measuring tube and the absorption bottle with the corresponding solution to the mark, close the piston, and lower the level bottle to form a negative pressure in the instrument. If the instrument is airtight, the liquid level in the gas measuring tube should not continue to decrease, and the liquid level in the absorption bottle should not continue to rise. 4.3.1.5 Determination
Operate the level bottle, take 30-50 mL of the analyzed gas that has been decompressed to atmospheric pressure and clean the instrument pipeline 2-3 times, then inhale slightly more than 100 mL of the analytical gas sample into the gas measuring tube, rotate the three-way piston to connect the gas measuring tube to the atmosphere, discharge the excess gas, and adjust the liquid level of the closed solution to zero scale. Close the three-way piston.
Open the two-way piston on the first absorption bottle, slowly lift the level bottle, press the analytical gas sample in the gas measuring tube into the absorption bottle, and then slowly lower the level bottle to return the analytical gas sample to the gas measuring tube. After repeating this operation 3-4 times, return the residual gas to the gas measuring tube and read the oxygen content horizontally. Repeat the above operation until the reading value is constant. In order to check the failure degree of the absorption liquid, press the residual gas into the second absorption bottle and perform the measurement operation. When it is found that the measured value using the first absorption bottle is lower than the measured value using the second absorption bottle, the absorption liquid should be replaced. 4.3.1.6 Result processing
The arithmetic mean of two parallel determinations shall be the final determination result. The difference between the two determination results shall not exceed 0.1%. 4.3.2 Gas chromatography
4.3.2.1 Instrument
A gas chromatograph with a thermal conductivity detector shall be used. The instrument's detection limit for oxygen shall not be higher than: 0.05×10-24.3.2.2 Operating conditions
Carrier gas: pure fluorine. Flow rate 30~40mL/min; working current: about 80mA;
Chromatographic column: 5A or 13X molecular sieve column of about 1.6m in length and 0.25~0.40mm; Chromatographic column temperature: room temperature.
Standard sample: The oxygen content in nitrogen is as shown in Table 1. The allowable difference is ±2%, and it is prepared according to the provisions of GB/T5274 or GB/T10627. 4.3.2.3 Determination steps
Start the instrument according to the instrument manual and select the operating conditions until the instrument works stably. Connect the sample gas to be tested and the standard gas to the inlet of the instrument sample valve with a pressure reducing valve and a sampling tube, and replace the bottle valve, sampling valve and its pipeline by three times of pressure increase and decrease. Switch the six-way valve for sampling. Measure the peak height or peak area of the oxygen peak. Repeat the sampling twice. When the relative deviation is not greater than 5%, take the average value for calculation. 4.3.2.4 Calculation
The oxygen content in nitrogen is calculated according to formula (2):
=(p2/h2)·h1
Where: h1—oxygen content in sample gas, 10-6V/V, d—oxygen content in standard gas, 10-*V/V, hl—oxygen peak height in sample gas, mm (or peak area, mm); h2—oxygen peak height in standard gas, mm (or peak area, mm). 4.4 Determination of moisture
4.4.1 Determination of water vapor content
The determination shall be carried out in accordance with the provisions of GB/T5832.1 or GB/T5832.2. The two methods have equal validity. 4.4.2 Determination of free water
The free water in the nitrogen cylinder shall be determined by the inversion method. After cooling the nitrogen cylinder to room temperature, turn it upside down vertically for 10 minutes, slightly open the bottle valve, let the water flow into a clean and dry container, and close the bottle valve immediately when the gas sprays out, and simply measure the amount of water flowing out. 5 Packaging, marking, safety
5.1 Packaging container
The cylinders for filling, storing and transporting liquid nitrogen shall comply with the provisions of GB5099. The containers for filling, storing and transporting liquid nitrogen shall comply with the provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" and JB/T5905 and JB/T6897. Before leaving the factory, bottled nitrogen should be checked for leaks at the bottle mouth, bottle valve threaded connection and bottle valve stem, and bottle caps and anti-vibration rings should be put on. 1.13
5.2 Filling
5.2.1 Gaseous nitrogen
GB/T 3864—1996
Gaseous nitrogen filling should comply with the provisions of GB14194. After confirming that the temperature of nitrogen in the cylinder is equal to the ambient temperature, measure the gas pressure with a pressure gauge of not less than 2.5, which should be 15.0±0.5MPa at 20℃.
At 20℃ and 101.3kPa, the volume V (m2) of gaseous nitrogen in the cylinder is calculated according to formula (3): V?=K.V3
Wherein: K--nitrogen volume conversion coefficient, see Appendix A (Standard Appendix); V3-
-water volume of nitrogen cylinder, L.
5.2.2 Liquid nitrogen
The filling of liquid nitrogen shall comply with the provisions of GB14193. The mass of liquid nitrogen is converted to the volume Vz (m2) of gaseous nitrogen at 20℃ and 101.3kPa, calculated according to formula (4): V2 = m × 1 000/1. 165
mass of liquid nitrogen, t;
Wherein: m
1.165-density of nitrogen, kg/m.
5.3 Marking
The steel stamping of nitrogen cylinders shall comply with the provisions of the "Safety Supervision Regulations for Gas Cylinders", see Chapter B2 in Appendix B (Informative Appendix). The paint color marking of nitrogen cylinders shall comply with the provisions of GB7144. The safety marking of nitrogen cylinders for transportation shall comply with the provisions of GB190. The container for packaging industrial nitrogen shall be marked with the yellow words "Industrial Nitrogen". 5.4 Safety
(4)
5.4.1 The safe use, transportation and storage of nitrogen cylinders shall comply with the provisions of the "Safety Supervision Regulations for Gas Cylinders", see Chapter B1 in Appendix B (Informative Appendix). If there are new regulations, follow the new regulations. The safe use of cryogenic liquid storage equipment shall comply with the provisions of JB/T6898. 5.4.2 When the nitrogen content in the air increases, people will suffocate due to lack of oxygen. The volume concentration of oxygen in the air in the workplace should not be less than 19%. 5.4.3 In order to avoid an increase in the nitrogen concentration in the workshop, nitrogen is not allowed to be discharged indoors. When working in a place where there is a large amount of nitrogen, you should wear an oxygen respirator.
5.4.4 When inspecting nitrogen filling equipment and container pipelines, they need to be replaced with air, and work is allowed only after the oxygen content is analyzed and qualified. 5.5 Certificate of Compliance
Nitrogen should be accompanied by a quality certificate when leaving the factory, and its contents include: product name, category and quality grade, manufacturer name, production date or production batch number, nitrogen quantity (m), pressure (MPa) or mass (kg), and this standard code. Temperature
（105)
0, 1000.105
0.0980.103
Use, storage and transportation of gas cylinders
GB/T 3864-1996
Appendix A
（Standard Appendix）
Nitrogen volume conversion factor K
Pressure, MPa(kg/cm\)
10.1600.166
（130）
Appendix B
（Reminder Appendix）
Relevant provisions of the "Regulations on Safety Supervision of Gas Cylinders" Article 68 When transporting and loading and unloading gas cylinders, the following requirements shall be observed: 1
There shall be obvious safety signs on the means of transport; 14.2
0.192/0. 199
Bottle caps must be worn (except for those with protective covers), loading and unloading should be done with care, and throwing, sliding, rolling, and bumping are strictly prohibited. 2
When hoisting, electromagnetic cranes and chains are strictly prohibited. 3
4 Gas cylinders that can cause combustion or explosion when the gases in the cylinders come into contact with each other and produce toxic substances must not be transported in the same vehicle (compartment). 15.2
0.2050.211
0.1980.204
0.1920.198
0.1860.192
0.,181 0. 186
0.1760.181
0.1710.176
0.1670.172
0.1630.168↓0.172
0.1600.164|| tt||0.1520.156
0.1530.157
0.1490.154
0.1390.143
0.1380.142
0.1350.139
Flammable, explosive, corrosive items or items that react chemically with the gas in the cylinder shall not be transported together with the cylinder; 5 The cylinders shall be properly fixed when loaded on the vehicle. When placed horizontally, the head shall face one side, and the stack height shall not exceed the height of the carriage, and shall not exceed five layers; when placed vertically, the height of the carriage shall be more than two-thirds of the height of the cylinder. In summer, there should be sunshade facilities to avoid exposure to the sun, and transportation in busy urban areas of cities should be avoided during the day; 6
Fireworks are strictly prohibited. When transporting flammable gas cylinders, fire extinguishing equipment shall be available on the means of transport, 7
GB/T3864-1996
8 Vehicles and ships transporting gas cylinders shall not stop near busy urban areas or important agencies; when vehicles and ships stop, drivers and escorts shall not leave at the same time;
9 Cylinders containing liquefied petroleum gas should not be transported over long distances. Article 69 When storing gas cylinders, the following requirements shall be observed: 1. They shall be stored in special warehouses, and the gas cylinder warehouses shall comply with the relevant provisions of the Code for Fire Prevention of Building Design; 2. There shall be no trenches or secret passages in the warehouse, and open flames and other heat sources are strictly prohibited. The warehouse shall be ventilated and dry to avoid direct sunlight; 3. Gas cylinders containing gases that are prone to polymerization or decomposition must have a specified storage period and should be away from radioactive radiation sources; 4. Empty bottles and full bottles shall be placed separately and clearly marked. Toxic gas cylinders and gas cylinders that can cause combustion, explosion, and produce poisons when in contact with the gas in the bottles shall be stored in separate rooms, and anti-toxic appliances or fire-fighting equipment shall be set up nearby; 5. Gas cylinders shall be placed neatly and equipped with bottle caps. When placed upright, they shall be properly fixed; when placed horizontally, the heads shall face the same direction, and the stack height shall not exceed five layers.
Article 70 When using gas cylinders, the following regulations shall be observed: 1. The steel stamp and color mark of the gas cylinder shall not be changed without authorization; 2. Before using the gas cylinder, a safety check shall be carried out to confirm the gas contained; 3. The placement of the gas cylinder shall not be close to the heat source and shall be 10m away from the open flame. Gas cylinders containing gases that are prone to polymerization or decomposition shall be away from radioactive radiation sources;
4. Measures shall be taken to prevent the gas cylinder from tipping over when it is placed upright; it shall be protected from sunlight in summer;
6. Knocking and magnetic collision are strictly prohibited;
7. Electric welding and arcing are strictly prohibited on the gas cylinder;
8. Temperatures exceeding 40℃ are strictly prohibited The heat source shall heat the gas cylinder; 9 The gas in the cylinder shall not be used up, and there must be residual pressure. The residual pressure of permanent gas cylinders shall not be less than 0.05MPa; Liquefied gas cylinders shall have residual gas of not less than (0.5~1.0)% of the specified filling volume; 10 In the use occasions where backflow may occur, the equipment must be equipped with anti-backflow devices, such as one-way valves, check valves, buffer tanks, etc.; 11 Users of liquefied petroleum gas cylinders shall not transfer the liquefied petroleum gas in the cylinder to other cylinders, and shall not handle the residual liquid in the cylinder by themselves;
12 After the cylinder is put into use, the cylinder body shall not be patched or welded. B2 Steel stamp mark of gas cylinders
Appendix 1 Steel stamp mark and inspection color code of gas cylinders 2 The steel stamp mark of gas cylinders shall comply with the following provisions: (1) When the steel stamp mark is stamped on the bottle shoulder, its position is as shown in Figure 1-1-A; when it is stamped on the shield, it is as shown in Figure 1-1-B. Manufacturing stamp marks
Figure 1-1-A
Inspection stamp marks
Manufacturing stamp marks
GB/T 3864—1996
Figure 1-1-B
(2) The items and arrangement of stamp marks are as shown in Figures 1-2-A and 1-2-B. 9
Meaning of the marks in the figure:
Inspection stamp mark
1—gas cylinder manufacturing unit code, 2—gas cylinder number, 3-hydraulic test pressure, MPa, 4—nominal working pressure, MPa; 5—actual weight, kg; 6—actual volume, L, 7-designed wall thickness of bottle body, 8—inspection mark of manufacturing unit and manufacturing year and month; 9—supervision inspection mark, 10—marking of gas cylinders for cold regions Figure 1-2-A Manufacturing stamp mark
Inspection date
Inspection unit code
Next inspection date
Pressure reduction mark
Nominal working pressure after installation
Figure 1-2-B Inspection stamp mark
(3) Manufacturing stamp marks can also be arranged along a circular line on the bottle. The arrangement of the items should be in the order of the guide numbers in Figure 1-2-A, that is:
(4) Inspection stamp mark can also be printed on the metal inspection mark, as shown in Figure 1-3. (7)
GB/T 3864—1996
Next inspection date
Inspection date
Inspection unit code
Figure 1-3
The font height of the stamp mark should be 5~10mm and the depth should be 0.3~0.5mm. 3
On the inspection stamp mark, the inspection color code should also be applied according to the inspection year. The color and shape of the inspection color code are as shown in the following tableInspection year
1The letters and numbers in brackets represent the code of the color. Color
Pink (RP01)
Iron red (R01)
Iron yellow (Y09)
Lavender (R01)
Dark green (G05)
Pink (RP01)
Iron red (R01)www.bzxz.net
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RP01)
2The major axis of the ellipse is about 80mm, the minor axis is about 40mm; the rectangle is about 80·10mm. 3The inspection color scale is a can ring cycle every 10 years. x
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse0)% of the specified filling amount of residual gas; 10 In situations where backflow may occur, the equipment must be equipped with anti-backflow devices, such as one-way valves, check valves, buffer tanks, etc.; 11 Users of liquefied petroleum gas cylinders shall not transfer the liquefied petroleum gas in the cylinders to other cylinders, and shall not handle the residual liquid in the cylinders by themselves;
12 After the cylinders are put into use, the cylinder bodies shall not be patched or welded for repair. B2 Steel stamp marks of gas cylinders
Appendix 1 Steel stamp marks and inspection color codes of gas cylinders 2 Steel stamp marks of gas cylinders shall comply with the following provisions: (1) When the steel stamp mark is stamped on the bottle shoulder, its position is as shown in Figure 1-1-A, and when it is stamped on the shield, it is as shown in Figure 1-1-B. Manufacturing stamp marks
Figure 1-1-A
Inspection stamp marks
Manufacturing stamp marks
GB/T 3864—1996
Figure 1-1-B
(2) The items and arrangement of stamp marks are as shown in Figures 1-2-A and 1-2-B. 9
Meaning of the marks in the figure:
Inspection stamp mark
1—gas cylinder manufacturing unit code, 2—gas cylinder number, 3-hydraulic test pressure, MPa, 4—nominal working pressure, MPa; 5—actual weight, kg; 6—actual volume, L, 7-designed wall thickness of bottle body, 8—inspection mark of manufacturing unit and manufacturing year and month; 9—supervision inspection mark, 10—marking of gas cylinders for cold regions Figure 1-2-A Manufacturing stamp mark
Inspection date
Inspection unit code
Next inspection date
Pressure reduction mark
Nominal working pressure after installation
Figure 1-2-B Inspection stamp mark
(3) Manufacturing stamp marks can also be arranged along a circular line on the bottle. The arrangement of the items should be in the order of the guide numbers in Figure 1-2-A, that is:
(4) Inspection stamp mark can also be printed on the metal inspection mark, as shown in Figure 1-3. (7)
GB/T 3864—1996
Next inspection date
Inspection date
Inspection unit code
Figure 1-3
The font height of the stamp mark should be 5~10mm and the depth should be 0.3~0.5mm. 3
On the inspection stamp mark, the inspection color code should also be applied according to the inspection year. The color and shape of the inspection color code are as shown in the following tableInspection year
1The letters and numbers in brackets represent the code of the color. Color
Pink (RP01)
Iron red (R01)
Iron yellow (Y09)
Lavender (R01)
Dark green (G05)
Pink (RP01)
Iron red (R01)
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RP01)
2The major axis of the ellipse is about 80mm, the minor axis is about 40mm; the rectangle is about 80·10mm. 3The inspection color scale is a can ring cycle every 10 years. x
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse0)% of the specified filling amount of residual gas; 10 In situations where backflow may occur, the equipment must be equipped with anti-backflow devices, such as one-way valves, check valves, buffer tanks, etc.; 11 Users of liquefied petroleum gas cylinders shall not transfer the liquefied petroleum gas in the cylinders to other cylinders, and shall not handle the residual liquid in the cylinders by themselves;
12 After the cylinders are put into use, the cylinder bodies shall not be patched or welded for repair. B2 Steel stamp marks of gas cylinders
Appendix 1 Steel stamp marks and inspection color codes of gas cylinders 2 Steel stamp marks of gas cylinders shall comply with the following provisions: (1) When the steel stamp mark is stamped on the bottle shoulder, its position is as shown in Figure 1-1-A, and when it is stamped on the shield, it is as shown in Figure 1-1-B. Manufacturing stamp marks
Figure 1-1-A
Inspection stamp marks
Manufacturing stamp marks
GB/T 3864—1996
Figure 1-1-B
(2) The items and arrangement of stamp marks are as shown in Figures 1-2-A and 1-2-B. 9
Meaning of the marks in the figure:
Inspection stamp mark
1—gas cylinder manufacturing unit code, 2—gas cylinder number, 3-hydraulic test pressure, MPa, 4—nominal working pressure, MPa; 5—actual weight, kg; 6—actual volume, L, 7-designed wall thickness of bottle body, 8—inspection mark of manufacturing unit and manufacturing year and month; 9—supervision inspection mark, 10—marking of gas cylinders for cold regions Figure 1-2-A Manufacturing stamp mark
Inspection date
Inspection unit code
Next inspection date
Pressure reduction mark
Nominal working pressure after installation
Figure 1-2-B Inspection stamp mark
(3) Manufacturing stamp marks can also be arranged along a circular line on the bottle. The arrangement of the items should be in the order of the guide numbers in Figure 1-2-A, that is:
(4) Inspection stamp mark can also be printed on the metal inspection mark, as shown in Figure 1-3. (7)
GB/T 3864—1996
Next inspection date
Inspection date
Inspection unit code
Figure 1-3
The font height of the stamp mark should be 5~10mm and the depth should be 0.3~0.5mm. 3
On the inspection stamp mark, the inspection color code should also be applied according to the inspection year. The color and shape of the inspection color code are as shown in the following tableInspection year
1The letters and numbers in brackets represent the code of the color. Color
Pink (RP01)
Iron red (R01)
Iron yellow (Y09)
Lavender (R01)
Dark green (G05)
Pink (RP01)
Iron red (R01)
Iron yellow (Y09)
Lavender (P01)
Dark green (G05)
Pink (RP01)
2The major axis of the ellipse is about 80mm, the minor axis is about 40mm; the rectangle is about 80·10mm. 3The inspection color scale is a can ring cycle every 10 years. x
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse
Ellipse
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