Some standard content:
National Standard of the People's Republic of China
Industrial oxygen
Industrial oxygen
1 Subject content and scope of application
GB/T 3863-1995
Replaces GB3863-83
This standard specifies the technical requirements, inspection methods, inspection rules, packaging, marking, storage, transportation and safety requirements for industrial oxygen. This standard applies to gaseous and liquid oxygen produced by cryogenic air separation, mainly used for gas flame processing and other industrial purposes. Molecular formula: 02
Relative molecular mass: 31.999 (according to the international relative atomic mass in 1991) 2 Reference standards
Dangerous goods packaging mark
GB5099
Steel seamless gas cylinders
GB5832.2 Determination of trace moisture in gas-Dew point methodGB7144
Gas cylinder color marking
GB8979
GB11640
GB 14194
ZB J76 003
Aluminum alloy seamless gas cylinders
Filling regulations for permanent gas cylinders
Fixed vacuum powder superheated cryogenic liquid storage tank ZB J76 022
3 Technical requirements
Ordinary insulated powder storage tank
The quality of industrial oxygen shall meet the requirements of Table 1. Table 1
Oxygen content (volume fraction)
Free water, mL/bottle
Dew point, ℃
Note: Liquid oxygen does not specify water content.
Approved by the State Administration of Technical Supervision on December 20, 1995Superior product
First-class product
No free water
Qualified product
Implemented on August 1, 1996
Testing method
4.1 Determination of oxygen content
4.1.1 Method and principle
GB/T3863-1995
Determination is carried out by the copper ammonia solution absorption method. Take a certain amount of sample gas and contact it with the absorption liquid. Oxygen is absorbed in the absorption bottle after reaction. The oxygen content is determined according to the reduction in the volume of the sample gas. 4.1.2 Reagents and materials
4.1.2.1 Ammonium nitride (GB/T658): analytical grade; 4.1.2.2 Ammonia water (GB/T631): 25% 28% solution; 4.1.2.3 Distilled water;
4.1.2.4 Mixed solution: dissolve 600g ammonium chloride in 1000mL distilled water, add 1000mL ammonia water, and mix well; 4.1.2.5 Vacuum piston grease:
4.1.2.6 Copper wire ring: use No. 2 copper (pure copper) with a diameter of 1mm (in accordance with the requirements of GB466 "Copper Classification" or YB145 "Chemical Composition of Pure Copper Processing Products") copper wire, wind it around a rod with a diameter of 5mm, remove it and cut it into small pieces of 10mm long. 4.1.3 Instruments
The oxygen analyzer is shown in Figure 1. The processing diagram is shown in Appendix A (reference). Figure 1
1-Gas pipe, 2-three-way piston, 3-connecting tube, 4-capillary tube, 5-absorption bottle; 6-liquid seal bottle; 7-level bottle 4.1.4 Determination steps
4.1.4.1 Preparation
GB/T3863-1995
4.1.4.1.1 Fill the absorption bottle with copper wire ring. Connect the various components of the analyzer with a small rubber tube, and apply a small amount of vacuum piston grease to the three-way piston.
4.1.4.1.2 Inject the mixed liquid into the level bottle, turn the three-way piston to connect the gas pipe with the absorption bottle, and use the level bottle to raise and lower the gas pipe, capillary tube, absorption bottle and all pipes to fill the mixed liquid. A total of about 550mL of mixed liquid is required. 4.1.4.1.3 Adjust the liquid level in the liquid seal bottle to an appropriate position. Close the piston and lower the level bottle. If the liquid level in the gas pipe does not drop, it means that the instrument is not leaking.
4.1.4.2 Measurement
4.1.4.2.1 Turn the three-way piston to connect the gas pipe to the atmosphere. Use the level bottle to adjust the liquid level to the highest point of the piston branch and close the three-way piston.
4.1.4.2.2 Take a sample from the gas cylinder through the pressure reducing valve connected to the rubber hose. First, use a large air flow to blow off the valve and pipeline for 0.5 minutes, and then adjust to the flow rate required for analysis to purge for 1 minute.
4.1.4.2.3 Connect the rubber hose connected to the pressure reducing valve to the three-way piston branch, quickly open the three-way piston to allow the sample gas to enter the gas pipe. When it slightly exceeds 100mL, tighten the rubber hose connecting the level bottle and the gas pipe, and quickly remove the rubber hose for sampling. Raise the level bottle so that its liquid level is slightly higher than the liquid level in the gas measuring tube, loosen the rubber tube slightly, and tighten it when the liquid level in the gas measuring tube reaches the zero mark. 4.1.4.2.4 Turn the three-way piston to connect the gas measuring tube with the absorption bottle, slowly lift the level bottle to allow all the gas sample to enter the absorption bottle, and close the three-way piston.
4.1.4.2.5 Carefully and fully oscillate the instrument. After 3 minutes, open the three-way piston to slowly return the gas to the gas measuring tube. When the absorption liquid just enters the gas measuring tube, close the piston and lift the level bottle to align the liquid level in the gas measuring tube with the liquid level in the gas measuring tube. At this time, the corresponding scale of the liquid level in the gas measuring tube is the oxygen content (volume fraction) in the sample, 10-2 (V/V). 4.1.4.2.6 Allow the unabsorbed gas in the gas measuring tube to enter the absorption bottle again for reabsorption, until the difference between the two adjacent analysis results does not exceed 0.05%, and this analysis is completed.
Note: ① Always pay attention to fill the copper wire ring to make the gas fully contact with the copper wire. ② The absorption liquid will become invalid after absorbing dozens of samples. It should be replaced when it starts to turn yellow. When replacing, keep about one-fifth of the old solution. 4.1.5 Result processing
The difference between the results of two parallel measurements of the same sample should not exceed 0.05%, and the arithmetic mean is used as the analysis result. This method is an arbitration method. 4.2 Determination of moisture
4.2.1 Dew point method
The determination is carried out in accordance with the provisions of GB5832.2.
4.2.2 Inversion method
The condensed water in the oxygen cylinder is measured by the inversion method. After cooling the oxygen 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 oxygen sprays out, and simply measure the amount of water flowing out. The water content of each bottle of qualified products shall not exceed 100mL, and first-class products shall be free of free water.
5 Inspection rules
5.1 Industrial oxygen shall be inspected by the quality supervision and inspection department of the manufacturer. The manufacturer shall ensure that all industrial oxygen shipped out of the factory meets the requirements of this standard.
5.2 Bottled industrial oxygen shall be inspected in batches and randomly sampled and inspected according to the number of bottles specified in Table 2. If the inspection result shows that one bottle does not meet the requirements of this standard, the sampling and inspection shall be doubled again. If there is still one bottle that does not meet the requirements of this standard, the batch of products shall be unqualified. Table 2
Product batch, bottle
Sampling quantity, bottle
5.3 Industrial oxygen transported by pipeline shall be sampled and inspected at least twice within 8 hours, and the inspection results shall be applicable to any quantity of industrial oxygen transported within 8 hours.
GB/T 3863—1995
5.4 Liquid industrial oxygen should be sampled from each storage and transportation container for inspection. 5.5 Users have the right to inspect and accept in accordance with the provisions of this standard. 5.6 When users and manufacturers have objections to product quality, both parties shall negotiate or apply for arbitration. 6 Packaging, marking, storage and transportation
6.1 The packaging, storage and transportation of industrial oxygen shall comply with the "Regulations on Safety Technical Supervision of Pressure Vessels", "Regulations on Safety Supervision of Gas Cylinders", "Rules for the Transportation of Dangerous Goods" and relevant regulations of the transportation department. 6.2 The paint color and marking of gas cylinder packaging shall comply with the provisions of GB190 and GB7144. 6.3 Unless otherwise specified, the filling pressure of industrial oxygen cylinders shall not be less than 15±0.5MPa at 20℃. 6.4 There shall be no leakage at the threaded connection between the gas cylinder and the cylinder valve, the gas valve outlet and the valve stem gap, and the gas cylinder shall be capped when leaving the factory. 6.5 Industrial oxygen cylinders and their maximum allowable pressures shall comply with the provisions of GB5099, GB11640, GB14194 and the "Regulations on Safety Supervision of Gas Cylinders".
6.6 The pressure of industrial oxygen cylinders shall be measured after confirming that the gas temperature is in equilibrium with the ambient temperature. The accuracy of the pressure gauge used for measurement shall not be lower than Class 2.5.
6.7 The residual pressure in the empty cylinders returned to the manufacturer shall not be lower than 0.5MPa. Cylinders without residual pressure and after regular tests shall be treated accordingly before filling.
6.8 The volume (V) of bottled industrial oxygen shall be calculated according to formula (1): V KV,
Where: V is the volume of oxygen in the bottle, m
K is the coefficient for conversion to the volume of oxygen at 20°C and 101.3kPa, which can be calculated from Appendix B (Supplement); V, is the water volume of the oxygen cylinder, L.
6.9 The packaging and transportation of liquid industrial oxygen in liquefied gas storage tanks or storage tanks shall comply with the provisions of ZBJ76003, ZBJ76022 and Articles 6.1 and 6.2 of this standard.
6.10 The mass of liquid industrial oxygen is converted into the volume of gaseous oxygen (V.) at 20°C and 101.3kPa according to formula (2): Vz-M/1.331
Where: V2-volume of oxygen, m;
M——mass of liquid oxygen, kg;
1.331——density of oxygen, kg/m.
6.11 Industrial oxygen shall be accompanied by a quality certificate when leaving the factory, and its contents shall include: a.
Product name and quality grade,
Manufacturer name;
Production date or batch number,
Packaging container number;
Volume (m\), pressure (MPa), or mass (kg) of oxygen; f.
Number of this standard.
7 Safety requirements
(2)
7.1 Oxygen is a colorless, tasteless, odorless, non-toxic, non-flammable gas. It is a strong oxidant and can support combustion. Its chemical properties are extremely active and it can react with many elements and release heat at the same time. Oxygen and combustible gases are prone to explosion when mixed in a certain proportion. When grease comes into contact with compressed oxygen and the temperature exceeds the ignition point, combustion may occur.
7.2 When oxygen accumulates indoors and its volume fraction exceeds 23×10-2, there is a risk of fire. Ventilation devices should be installed in places where the oxygen concentration may increase, and the oxygen concentration should be monitored. 131
GB/T3863--1995
7.3 Before overhauling and processing oxygen containers, oxygen must be replaced. Work can only begin when the oxygen content (volume fraction) drops below 23%.
7.4 The inside and outside of the gas cylinder should be kept clean at all times, and must not be contaminated with grease and other dirt. 7.5 Operators are not allowed to use open flames or approach fire sources immediately after leaving the oxygen-rich environment. 7.6 The filling pressure of gas cylinders shall be implemented in accordance with GB14194, and the filling time shall not be less than 45 minutes (40L gas cylinder). 7.7 Liquid oxygen operators should have adequate personal protection measures to prevent frostbite. 7.8 The gas cylinder should be strictly inspected before filling with oxygen, and other gases are prohibited from being filled in the container filled with oxygen. 135
A1 Gas pipe processing diagram And its technical conditions
A1.1 Gas tube processing diagram (see Figure A1)
A1.2 Gas tube technical conditions
A1.2.1- The scale is as shown in the direction of the figure.
GB/T3863-1995
Appendix A
Oxygen analyzer processing diagram
(reference)
Inner 11
Flat mouth
99mL mark
90mL. Standard
0 point standard
Figure A1 Gas tube
A1.2.20 points, 90mL, 99mL3 marks must be on the corresponding capillary, as shown in the figure. A1.2.3 Dividing table: 0 point mark to the piston closed is 100mL. A1.2.3.1 0~90 mL
Engrave a short line every 5 mL.
Engrave a long line every 10 mL and mark it with words.
A1. 2.3. 2 90~99 mL
Engrave a short line every 0.1 mL and a middle line every 0.5 mL. Engrave a long line every 1 mL and mark it with words.
A1.2.3.399~~100 mL
GB/T3863-1995
Short lines are marked every 0.05mL, and middle lines are marked every 0.1mL. Long lines are marked every 0.5mL, and characters are marked.
Among them: 100mL has no marking lines or characters.
A1.2.4 Volume quantification method: measuring type, the standard flow rate is 50～60s during quantification. A1.2.5 Volume verification segmentation and allowable error
A1.2.5.1 Verification segmentation
0 point, 90 mL, 99mL 3 points
A1.2.5.2 Allowable error
99 mL is ±0.05 mL, 90 mL is ±0.1 mL, 0 point is ±0.2 mL. A2 absorption bottle processing diagram (see Figure A2)
External 28
Figure A2 absorption bottle
Appendix B
Calculation of conversion factor K value
(Supplement)
At 20℃ and 101.3kPa, the oxygen volume conversion factor K is calculated as follows: K
Where: P—
Gas pressure in the cylinder, MPa;
Flat mouth
GB/T3863-1995
When measuring pressure, the gas temperature in the cylinder, ℃; when the temperature is t, the compressibility coefficient of oxygen.
The conversion coefficient K values at different temperatures and pressures are listed in the following table Conversion coefficient K
Gas in the bottle
Additional notes:
Pressure, MPa
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China and is technically managed by the Southwest Institute of Chemical Industry of the Ministry of Chemical Industry. This standard was drafted by Beijing Praxair Practical Gas Co., Ltd. and Southwest Institute of Chemical Industry. The main drafters of this standard are Zhou Wenhui and Dai Peishu. 18.0
The technical requirements of the superior products of this standard are equivalent to FOCTP5583-78 "Industrial and Medical Gaseous Chlorine", and the inspection method is equivalent to FOCTP5583-78 "Industrial and Medical Gaseous Oxygen" standard. 1385mL engraved center line. Every 1mL engraved long line and marked.
A1.2.3.399~~100 mL
GB/T3863-1995
Each 0.05mL engraved short line, every 0.1mL engraved center line. Every 0.5mL engraved long line and marked.
Among them: 100mL has no marking line and marking.
A1.2.4 Volumetric quantification method: measuring type, the standard flow rate for quantification is 50~60s. A1.2.5 Volume verification sections and allowable error
A1.2.5.1 Verification sections
3 points: 0 point, 90 mL, 99 mL
A1.2.5.2 Allowable error
99 mL is ±0.05 mL, 90 mL is ±0.1 mL, 0 point is ±0.2 mL. A2 absorption bottle processing drawing (see Figure A2)
External Update 28
Figure A2 absorption bottle
Appendix B
Calculation of conversion factor K value
(Supplement)
The oxygen volume conversion factor K at 20℃ and 101.3kPa is calculated according to the following formula: K
Where: P—
Gas pressure in the cylinder, MPa;
Flat mouth
GB/T3863-1995
When measuring pressure, gas temperature in the cylinder, ℃; compressibility coefficient of oxygen when temperature is t.
The conversion coefficient K values at different temperatures and pressures are listed in the following table Conversion coefficient K
Gas in the bottle
Additional notes:
Pressure, MPa
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China and is technically managed by the Southwest Institute of Chemical Industry of the Ministry of Chemical Industry. This standard was drafted by Beijing Praxair Practical Gas Co., Ltd. and Southwest Institute of Chemical Industry. The main drafters of this standard are Zhou Wenhui and Dai Peishu. 18.0
The technical requirements of the superior products of this standard are equivalent to FOCTP5583-78 "Industrial and Medical Gaseous Chlorine", and the inspection method is equivalent to FOCTP5583-78 "Industrial and Medical Gaseous Oxygen" standard. 1385mL engraved center line. Every 1mL engraved long line and marked.
A1.2.3.399~~100 mL
GB/T3863-1995
Each 0.05mL engraved short line, every 0.1mL engraved center line. Every 0.5mL engraved long line and marked.
Among them: 100mL has no marking line and marking.
A1.2.4 Volumetric quantification method: measuring type, the standard flow rate for quantification is 50~60s. A1.2.5 Volume verification sections and allowable error
A1.2.5.1 Verification sections
3 points: 0 point, 90 mL, 99 mL
A1.2.5.2 Allowable error
99 mL is ±0.05 mL, 90 mL is ±0.1 mL, 0 point is ±0.2 mL. A2 absorption bottle processing drawing (see Figure A2)bZxz.net
External Update 28
Figure A2 absorption bottle
Appendix B
Calculation of conversion factor K value
(Supplement)
The oxygen volume conversion factor K at 20℃ and 101.3kPa is calculated according to the following formula: K
Where: P—
Gas pressure in the cylinder, MPa;
Flat mouth
GB/T3863-1995
When measuring pressure, gas temperature in the cylinder, ℃; compressibility coefficient of oxygen when temperature is t.
The conversion coefficient K values at different temperatures and pressures are listed in the following table Conversion coefficient K
Gas in the bottle
Additional notes:
Pressure, MPa
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China and is technically managed by the Southwest Institute of Chemical Industry of the Ministry of Chemical Industry. This standard was drafted by Beijing Praxair Practical Gas Co., Ltd. and Southwest Institute of Chemical Industry. The main drafters of this standard are Zhou Wenhui and Dai Peishu. 18.0
The technical requirements of the superior products of this standard are equivalent to FOCTP5583-78 "Industrial and Medical Gaseous Chlorine", and the inspection method is equivalent to FOCTP5583-78 "Industrial and Medical Gaseous Oxygen" standard. 138
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