Some standard content:
GB 6819-1996
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Preface
This standard is equivalent to the Japanese Industrial Standard JISK1902-80 (confirmed in 1992) "Dissolved Acetylene". In terms of test methods, when detecting phosphorus and sulfur impurities, this standard stipulates the purge distance and air flow size. For the release amount before sampling, this standard adds 15% of the acetylene charge in areas where the temperature is higher than 28°C.
This standard is based on JISK1902-80 (confirmed in 1992) and has made certain modifications to GB6819-86. Among the test methods for acetylene purity, the fuming sulfuric acid method is added; indicators for phosphorus and sulfur impurities are added It is stipulated that 10% AgNO: the test paper will not discolor after being purged for 10 seconds, and the operation method clearly clarifies the adjustment of acetylene gas flow and purge distance, so that the operation can be unified and the comparability of the test results can be improved. This standard will replace GB6819--86 from the effective date. This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the technical jurisdiction of the Beijing Research Institute of Chemical Industry of the Ministry of Chemical Industry. The unit responsible for drafting this standard: Shanghai Wusong Chemical Factory. Units participating in the drafting of this standard: Sanming Chemical General Plant Calcium Carbide Plant, Guangzhou Chemical Plant, Jilin Chemical Industry Company United Chemical Plant. The main drafters of this standard: Wang Jiamin, He Zuying, Xu Juan. 176
1 range
National Standard of the People's Republic of China
Dissolved
Dissolved
N
Dissolved acetylene
Alkynes| |tt||GB 68191996
generation GB 6819 --86
This standard specifies the technical requirements, test methods, inspection rules, signs, labels, packaging, transportation, storage, safety, etc. for dissolved acetylene . This standard applies to crude acetylene gas produced by the reaction between calcium carbide and water or natural gas cracking, which is purified, compressed, dried, dissolved in acetone, and stored in a gas cylinder filled with porous packing. This product is mainly used as fuel gas for metal welding, cutting and heating. Molecular formula: CH,
Relative molecular mass: 26.04 (according to the 1993 international relative atomic mass) 2 Reference standards
The provisions contained in the following standards constitute this standard by being quoted in this standard Articles. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T1250--89 Limit value expression and judgment method GB7144-86 gas cylinder color mark
GB13591-92 Dissolved acetylene filling regulations
Ministry of Labor Laoguozi (1993) No. 4 document "Safety Supervision Regulations for Dissolved Acetylene Cylinders" 3 requirements
3.1 The quality of dissolved acetylene should meet the requirements of Table 1. Table 1 Lu
Quality requirements for dissolved acetylene
item
item
acetylene purity, % (V/V)
phosphine, hydrogen sulfide
Test method
refers to
98.0
standard
10% silver nitrate test paper does not discolor
The reagents and water used in this standard are When no other requirements are noted, analytical reagents and laboratory distilled water that comply with current standards or water of corresponding purity are used.
4.1 Sampling conditions
After the gas cylinder is inflated, let it stand for more than 8 hours. According to the temperature in each region, 5% of the acetylene gas filling amount should be released before sampling. In areas where the temperature is higher than 28℃, 15% of the acetylene gas filling volume can be released before sampling1. Instructions for further use:
1FJISK1902:·80 (confirmed in 1992) stipulates that sampling should be taken after the test container has released 5% of its B fast filling capacity." Approved by the State Bureau of Technical Supervision 1996-10-28 1997-06 -01 Implementation
177
4.2 Sampling method
GB 6819—1996
Use latex tube to connect the gas bottle nozzle and absorption tube, and use dissolved acetylene to fully replace the gas in the absorption tube Sampling after air. 4.3 Determination of acetylene purity
Either bromine method or fuming sulfuric acid method can be selected. 4.3.1 Bromine method
4.3.1.1 Method summary||tt| |Acetylene reacts chemically with a bromine-saturated solution of potassium bromide to form tetrabromoethane. The volume replaced by the bromine-saturated solution is the purity of acetylene.
a) Potassium bromide solution: 300g. /L;
b) Bromine-saturated solution of potassium bromide: Place the potassium bromide solution in a ground-mouth glass bottle with a stopper, slowly add bromine, and shake it fully to make it saturated. Leave to stand for one day. 4.3.1.3 Instruments and equipment
Acetylene gas absorption tube: made of glass, with a scale of 50mL, a scale of 100, and a scale of 0.1. The structural dimensions are as shown in Figure 1 | |tt||Outer diameter 28
Inner diameter 425
5
0
S9
S
5
Outer Diameter 48.5
Inner diameter fee 5.5
f90
180
?
p1.5
4
Outer diameter fee 8.5
Inner diameter 5.5
?
Outer diameter 24
Inner diameter 21
4
Unit mm
1— Absorption liquid storage place (bromine-saturated solution of potassium bromide); 2—cock; 3—gas absorption tube (capacity 50 mL): a has a scale of 100; a~b—a minute scale of 0.1; b～d—a minute scale of 1; d—scale 0; 4—cock; 5—sample population Figure 1
acetylene gas absorption tube
178
4.3.1.4 analysis steps
GB 6819-1996
Connect the valve of the acetylene cylinder to be tested to the sample inlet 5. After opening the cocks 2 and 4, slowly open the valve, replace the air in the absorption tube 3 with the sample gas from the cylinder, and close the cock first. 2. After closing the cock 4 in sequence to disconnect the air source, quickly turn the cock 4 to balance the internal pressure of the absorption tube with the external air pressure. Fill the absorption liquid storage 1 of the absorption tube with the bromine-saturated solution of potassium bromide, and absorb the liquid. The surface is about 15mm away from the mouth of the pipe. Slowly turn the cock 2 to allow the absorption liquid to flow in slowly. The liquid absorbed in 1 will no longer enter 3. Read the liquid level scale in 3 as the acetylene purity. % (V/V). Note: When the absorption capacity of the absorbing liquid is poor, it must be prepared again. 4.3.1.5 Expression of analysis results
The acetylene purity expressed as a volume percentage shall be based on the liquid level scale value in the acetylene gas absorption tube 3, and the result determination shall be carried out according to the rounded value comparison method specified in GB/T1250 5.2.
4.3.1.6 Allowable difference
The arithmetic mean of two parallel measurement results for each bottle of gas is the measurement result, and the difference between the two parallel measurement results shall not be greater than 0.2%. 4.3.2 Fuming sulfuric acid method
4.3.2.1 Method summary
Using the fuming sulfuric acid method, the purity of dissolved acetylene can be read directly from the gas measuring tube of the Lenger Ossart instrument. 4.3.2.2 Reagents and materials
a) Fuming sulfuric acid;
b) Colored saturated salt water saturated with acetylene gas, 4.3.2.3 Instruments and equipment
Lenger·Au The structural dimensions of the Sutter absorption meter (referred to as the Ostenberg absorption meter) are shown in Figure 2.
179
6
Outer diameter 35
Inner diameter 32
5
Outer diameter 7.5
Inner diameter 1.2|| tt||Outer diameter 20.5
Inner diameter 17.5
GB6819—1996
55
Hose
100
99
t
92
outside meat
66
64
62
50
40
2
Outer diameter 8.0
Inner diameter 1.2
Hose
80f
d
C
Outer diameter 8.0|| tt||inner diameter 5.5
outer diameter 18.0
inner diameter 16.0
outer diameter 441.5
, inner diameter 39.0
unit mm
1 -Gas volumetric tube (capacity 100mL): a--scale 100za~b-minus scale 0.1; b~c-minus scale 0.2; c~d sub-scale 1.0; d~e sub-scale 0.1:e—scale 0; 2—water level bottle (saturated salt water): 3—sample population; 4—tee; 5—cock; 6—gas absorption tube (capacity 250 mL) (sulfur trioxide sulfuric acid solution); 7— - Glass straws that promote gas absorption (135 glass straws with an outer diameter of 5.5mm and an inner diameter of 4.5mm): 8 - rubber tubes, etc.: 9 - exhaust pipe Figure 2 Austen Absorption Meter
4.3.2.4 Analysis Steps
a) Before sampling, release the acetylene gas according to the requirements of 4.1, and then use the bladder to take samples. The sampling bladder was replaced several times with acetylene gas before sampling for later use. b) Inject 200mL of colored saturated salt water saturated with acetylene gas into the water level bottle. c) Inject oleum into the gas absorption tube. d) Check the air tightness of the instrument.
Three-way valve 4 is connected to the atmosphere, and the cock 5 is closed. Raise the water level bottle 2 to discharge the gas. The saturated salt water rises to the mark 100 in the gas measuring tube 1. Turn the three-way valve 4 to isolate it from the atmosphere and open the cock 5. Slowly put down the water level bottle, so that the liquid level in the gas measuring tube 1 slowly drops while the liquid level in the absorption tube slowly rises, so that the liquid level submerges the glass thin tube and mark it. Wait about 5 minutes until the liquid level does not change, indicating that the air tightness is good.
e) Test operation
180
GB 6819-1996
The bladder is connected to the sample inlet 3, and the saturated salt water in the water level bottle 2 is filled with gas. After pipe 1, open the three-way valve 4 so that 3 is connected with the exhaust pipe 9, slowly open the bladder, and soon discharge the sample from 9. After expelling the air between 3 and 4, restore 4 and lower the water level. In bottle 2, the sample is introduced into the gas measuring tube 1 to a position slightly beyond the zero mark. Close the bladder. Then, while aligning the liquid levels of 2 and 1, turn 4 to slowly discharge the sample from 9. The liquid level of 2 exactly coincides with the zero mark of 1, closing 4. Open cock 5 and lift 2 so that the sample in 1 completely flows into the gas absorption tube 6 filled with absorption liquid. After the sample gas is absorbed back and forth between the gas absorption tube 6 and the gas measuring tube 1 several times, lower it 2 so that Return the remaining sample to 1, align the liquid levels of 1 and 2, and read the scale of 1. Repeat this operation several times until the scale of 1 is read at a fixed value. This value is regarded as acetylene purity % (V/V). Note
1 The absorbent liquid with reduced absorption capacity must be replaced with new one. 2. The absorption liquid should be used at 15℃~~~30℃.
4.3.2.5 Expression of analysis results
Acetylene purity % expressed as volume percentage (V/V), based on the scale value of the liquid level of the gas volume tube after absorption, the result is judged according to GB/ The provisions of 5.2 rounded value comparison method in T1250 shall be implemented. 4.3.2.6 Allowable difference
The arithmetic mean of two parallel measurement results for each bottle of gas is the measurement result. The difference between the two parallel measurement results shall not be greater than 0.2%. 4.4 Determination of phosphine and hydrogen sulfide||tt| |4.4.1 Method Summary
If acetylene gas contains phosphine and hydrogen sulfide impurities, it will react chemically with the silver nitrate solution to generate silver phosphide and silver sulfide compounds that appear yellow and brown-black respectively. Color development and qualitative detection of phosphine and hydrogen sulfide. 4.4.2 Reagents and materials
a) Silver nitrate solution: 100g/L,
b) Laboratory qualitative filter paper: 30mm×40mm. 4.4.3 Analysis steps
Put 2~~3 drops of silver nitrate solution on the filter paper. The wetted area is about $25mm. When the filter paper is wet, quickly place it in the airflow of the sample cylinder. The surface of the filter paper is perpendicular to The air flow is about 60mm away from the valve. Hold one side of the filter paper with one hand. The amount of air flowing out of the valve should be as long as the test paper is not deflected by the blow, but the filter paper shakes slightly under the air flow. Use a stopwatch to time and purge 10$ , the filter paper is considered qualified if it does not discolor. 5 Inspection Rules
5.1 Dissolved acetylene shall be inspected by the technical inspection department of the manufacturer. The manufacturer guarantees that all dissolved acetylene products leaving the factory shall meet the requirements of this standard.
5.2 The user has the right to inspect the received dissolved acetylene in accordance with the provisions of this standard. 5.3 If even one index in the test result does not meet the requirements of this standard, retest should be carried out with twice the number of sampled cylinders. If the retest result even has one index that does not meet the requirements of this standard, the entire batch of dissolved acetylene shall be Unqualified. 5.4 When a dispute arises between the supply and demand parties over product quality, the two parties shall negotiate to select an arbitration institution. During the arbitration, inspection shall be carried out in full compliance with the acceptance rules and test methods specified in this standard.
The filling of 5.5 dissolved acetylene cylinders is implemented in accordance with GB13591. The net weight of each bottle of dissolved acetylene is 5~7kg (referring to the 401 type acetylene cylinder). 5.6 Dissolved acetylene products should be grouped into a batch of gas cylinders that are discharged at the same time, and the gas cylinders should be used as sampling units. Samples below 100 bottles (including 100 bottles) should be sampled at 5% of the gas cylinders, and samples from more than 100 bottles to 500 bottles (including 500 bottles) should be taken. bottles), every additional 100 bottles are sampled at 2% of the gas cylinders, and every additional 100 bottles above 500 bottles are used:
, 17JISK1902--80 (confirmed in 1992) stipulates that 10% AgNO under humid conditions : Place the test paper in the sample airflow and check whether it is colored within 10 seconds*.
181
Sampling in 1% cylinder increments.
6 Signs, labels, packaging, transportation and storage GB 6819-
—1996
6.1 The signs, labels and packaging of dissolved acetylene shall be in accordance with the Labor Guozi (Lao Guo Zi) issued by the Ministry of Labor. The relevant provisions in Document No. 4 of 1993 shall be implemented. 6.2 All dissolved acetylene shipped from the factory should be attached with a product label, indicating: product name, manufacturer name, factory address, trademark, production date, production license number, product standard number and certification seal. 6.3 The color, lettering, lettering and arrangement of the outer surface of the dissolved acetylene gas cylinder should comply with the regulations of GB7144. 6.4 Use soapy water to detect leaks on the valves, fusible plugs, etc. on the dissolved acetylene cylinder. There must be no air leakage anywhere, otherwise it will not be allowed to leave the factory. 6.5 The transportation and storage of dissolved acetylene cylinders shall be handled in accordance with the relevant regulations in Chapter 7 of Document No. 4 of the Ministry of Labor, Lao Guo Zi (1993). 7 Safety and Others
7.1 Safety Matters
Acetylene is a flammable and explosive gas. When using dissolved acetylene, you should follow Article 64 of Chapter 7 of Document No. 4 of the Ministry of Labor (1993) Provisions are enforced.
7.2 Residual pressure
The remaining pressure of the dissolved acetylene cylinder between -5℃+35℃ should comply with Table 2. Table 2 Residual pressure of dissolved acetylene cylinder
Temperature, ℃
Minimum pressure, MPa
-5～0
0.05
0~10| |tt||0.1
10~25
0.2
If the inspection results do not meet the requirements of Table 2, the regulations in 5.2 of GB13591 shall be followed. 182
25～40
0.3
1. After releasing acetylene gas, use a bladder to take samples. The sampling bladder was replaced several times with acetylene gas before sampling for later use. b) Inject 200mL of colored saturated salt water saturated with acetylene gas into the water level bottle. c) Inject oleum into the gas absorption tube. d) Check the air tightness of the instrument.
Three-way valve 4 is connected to the atmosphere, and the cock 5 is closed. Raise the water level bottle 2 to discharge the gas. The saturated salt water rises to the mark 100 in the gas measuring tube 1. Turn the three-way valve 4 to isolate it from the atmosphere and open the cock 5. Slowly put down the water level bottle, so that the liquid level in the gas measuring tube 1 slowly drops while the liquid level in the absorption tube slowly rises, so that the liquid level submerges the glass thin tube and mark it. Wait about 5 minutes until the liquid level does not change, indicating that the air tightness is good.
e) Test operation
180
GB 6819-1996
The bladder is connected to the sample inlet 3, and the saturated salt water in the water level bottle 2 is filled with gas. After pipe 1, open the three-way valve 4 so that 3 is connected with the exhaust pipe 9, slowly open the bladder, and soon discharge the sample from 9. After expelling the air between 3 and 4, restore 4 and lower the water level. In bottle 2, the sample is introduced into the gas measuring tube 1 to a position slightly beyond the zero mark. Close the bladder. Then, while aligning the liquid levels of 2 and 1, turn 4 to slowly discharge the sample from 9. The liquid level of 2 exactly coincides with the zero mark of 1, closing 4. Open cock 5 and lift 2 so that the sample in 1 completely flows into the gas absorption tube 6 filled with absorption liquid. After the sample gas is absorbed back and forth between the gas absorption tube 6 and the gas measuring tube 1 several times, lower it 2 so that Return the remaining sample to 1, align the liquid levels of 1 and 2, and read the scale of 1. Repeat this operation several times until the scale of 1 is read at a fixed value. This value is regarded as acetylene purity % (V/V). Note
1 The absorbent liquid with reduced absorption capacity must be replaced with new one. 2. The absorption liquid should be used at 15℃~~~30℃.
4.3.2.5 Expression of analysis results
Acetylene purity % expressed as volume percentage (V/V), based on the scale value of the liquid level of the gas volume tube after absorption, the result is judged according to GB/ The provisions of 5.2 rounded value comparison method in T1250 shall be implemented. 4.3.2.6 Allowable difference
The arithmetic mean of two parallel measurement results for each bottle of gas is the measurement result. The difference between the two parallel measurement results shall not be greater than 0.2%. 4.4 Determination of phosphine and hydrogen sulfide||tt| |4.4.1 Method Summary
If acetylene gas contains phosphine and hydrogen sulfide impurities, it will react chemically with the silver nitrate solution to generate silver phosphide and silver sulfide compounds that appear yellow and brown-black respectively. Color development and qualitative detection of phosphine and hydrogen sulfide. 4.4.2 Reagents and materials
a) Silver nitrate solution: 100g/L,
b) Laboratory qualitative filter paper: 30mm×40mm. 4.4.3 Analysis steps
Put 2~~3 drops of silver nitrate solution on the filter paper. The wetted area is about $25mm. When the filter paper is wet, quickly place it in the airflow of the sample cylinder. The surface of the filter paper is perpendicular to The air flow is about 60mm away from the valve. Hold one side of the filter paper with one hand. The amount of air flowing out of the valve should be as long as the test paper is not deflected by the blow, but the filter paper shakes slightly under the air flow. Use a stopwatch to time and purge 10$ , the filter paper is considered qualified if it does not discolor. 5 Inspection Rules
5.1 Dissolved acetylene shall be inspected by the technical inspection department of the manufacturer. The manufacturer guarantees that all dissolved acetylene products leaving the factory shall meet the requirements of this standard.
5.2 The user has the right to inspect the dissolved acetylene received in accordance with the provisions of this standard. 5.3 If even one index in the test result does not meet the requirements of this standard, retest should be carried out with twice the number of sampled cylinders. If the retest result even has one index that does not meet the requirements of this standard, the entire batch of dissolved acetylene shall be Unqualified. 5.4 When a dispute arises between the supply and demand parties over product quality, the two parties shall negotiate to select an arbitration institution. During the arbitration, inspection shall be carried out in full compliance with the acceptance rules and test methods specified in this standard.
The filling of 5.5 dissolved acetylene cylinders is implemented in accordance with GB13591. The net weight of each bottle of dissolved acetylene is 5~7kg (referring to the 401 type acetylene cylinder). 5.6 Dissolved acetylene products should be grouped into a batch of gas cylinders that are discharged at the same time, and the gas cylinders should be used as sampling units. Samples below 100 bottles (including 100 bottles) should be sampled at 5% of the gas cylinders, and samples from more than 100 bottles to 500 bottles (including 500 bottles) should be taken. bottles), every additional 100 bottles are sampled at 2% of the gas cylinders, and every additional 100 bottles above 500 bottles are used:
, 17JISK1902--80 (confirmed in 1992) stipulates that 10% AgNO under humid conditions : Place the test paper in the sample airflow and check whether it is colored within 10 seconds*.
181
Sampling in 1% cylinder increments.
6 Signs, labels, packaging, transportation and storage GB 6819-
—1996
6.1 The signs, labels and packaging of dissolved acetylene shall be in accordance with the Labor Guozi (Lao Guo Zi) issued by the Ministry of Labor. The relevant provisions in Document No. 4 of 1993 shall be implemented. 6.2 All dissolved acetylene shipped from the factory should be attached with a product label, indicating: product name, manufacturer name, factory address, trademark, production date, production license number, product standard number and certification seal. 6.3 The color, lettering, lettering and arrangement of the outer surface of the dissolved acetylene gas cylinder should comply with the regulations of GB7144. 6.4 Use soapy water to detect leaks on the valves, fusible plugs, etc. on the dissolved acetylene cylinder. There must be no air leakage anywhere, otherwise it will not be allowed to leave the factory. 6.5 The transportation and storage of dissolved acetylene gas cylinders shall be handled in accordance with the relevant regulations in Chapter 7 of Document No. 4, Lao Guo Zi (1993) of the Ministry of Labor. 7 Safety and Others
7.1 Safety Matters
Acetylene is a flammable and explosive gas. When using dissolved acetylene, you should follow Article 64 of Chapter 7 of Document No. 4 of the Ministry of Labor (1993) Provisions are enforced.
7.2 Residual pressure
The remaining pressure of the dissolved acetylene cylinder between -5℃+35℃ should comply with Table 2. Table 2 Residual pressure of dissolved acetylene cylinder
Temperature, ℃
Minimum pressure, MPa
-5～0
0.05
0~10| |tt||0.1
10~25
0.2
If the inspection results do not meet the requirements of Table 2, the regulations in 5.2 of GB13591 should be followed. 182
25～40
0.3
1. After releasing acetylene gas, take a sample with a ball. Replace the sampling ball with acetylene gas several times before taking a sample for later use. b) Inject 200mL of colored saturated salt water saturated with acetylene gas into the water level bottle. c) Inject fuming sulfuric acid into the gas absorption tube. d) Check the air tightness of the instrument.
Three-way valve 4 is connected to the atmosphere, and the stopcock 5 is closed. Raise the water level bottle 2 to discharge the gas. The saturated salt water rises to the scale 100 in the gas measuring tube 1. Turn the three-way valve 4 to isolate it from the atmosphere and open the stopcock 5. Slowly lower the water level bottle, so that the liquid level in the gas measuring tube 1 slowly drops and the liquid level in the absorption tube slowly rises, so that the liquid level submerges the glass capillary and marks it. Wait for about 5 minutes. If the liquid level does not change, it means that the air tightness is good.
e) Test operation
180
GB 6819-1996
The ball bladder is connected to the sample inlet 3. After filling the gas measuring tube 1 with the saturated salt water in the water level bottle 2, open the three-way valve 4 to connect 3 with the exhaust pipe 9. Slowly open the ball bladder. Soon the sample is discharged from 9. After the air between 3 and 4 is expelled, restore 4 and lower the water level bottle 2. The sample is introduced into the gas measuring tube 1 to a position slightly exceeding the zero scale. Close the ball bladder. Then, while aligning the liquid levels of 2 and 1, rotate 4 to allow the sample to be slowly discharged from 9 so that the liquid level of 2 accurately coincides with the zero scale of 1. Close 4. Open the stopcock 5, lift 2 to make the sample in 1 completely flow into the gas absorption tube 6 filled with absorption liquid. After the sample gas is absorbed back and forth between the gas absorption tube 6 and the gas measuring tube 1 for several times, lower 2 to make the residual sample return to 1, align the liquid levels of 1 and 2, read the scale of 1, repeat this operation several times until the scale of 1 is a fixed value. This value is used as the acetylene purity % (V/V). Note
1 The absorption liquid with reduced absorption capacity must be replaced with a new one. 2 The absorption liquid is used at 15℃~～~30℃.
4.3.2.5 Expression of analysis results
Acetylene purity % (V/V) expressed as volume percentage shall be based on the scale value of the gas measuring tube liquid level after absorption. The result judgment shall be carried out in accordance with the provisions of 5.2 rounded value comparison method in GB/T1250. 4.3.2.6 Allowable difference
The arithmetic mean of the results of two parallel determinations of each bottle of gas is the determination result, and the difference between the two parallel determination results shall not exceed 0.2%. 4.4 Determination of phosphine and hydrogen sulfide
4.4.1 Summary of the method
If acetylene gas contains phosphine and hydrogen sulfide impurities, it will react chemically with silver nitrate solution to generate silver phosphide and silver sulfide compounds that appear yellow and brown-black respectively, and thus phosphine and hydrogen sulfide can be qualitatively detected by color development. 4.4.2 Reagents and materials
a) Silver nitrate solution: 100g/L,
b) Qualitative filter paper for laboratory use: 30mm×40mm. 4.4.3 Analysis steps
Put 2-3 drops of silver nitrate solution on the filter paper, and the wet area is about 25mm. When the filter paper is wet, quickly place it in the airflow of the sample cylinder, with the filter paper surface perpendicular to the airflow and about 60mm away from the valve. Hold the filter paper on one side with one hand. The amount of gas flowing out of the valve is determined by the test paper not being blown off, but the filter paper slightly shaking under the airflow. Use a stopwatch to time, blow for 10 minutes, and the filter paper is qualified if it does not change color. 5 Inspection rules
5.1 Dissolved acetylene shall be inspected by the technical inspection department of the manufacturer. The manufacturer guarantees that all dissolved acetylene products shipped from the factory shall meet the requirements of this standard.
5.2 The user has the right to inspect the dissolved acetylene received in accordance with the provisions of this standard. 5.3 If one of the indicators in the inspection results does not meet the requirements of this standard, it shall be re-tested with twice the number of cylinders for sampling. If even one of the indicators in the re-test results does not meet the requirements of this standard, the entire batch of dissolved acetylene shall be unqualified. 5.4 When the supply and demand parties have a dispute over the product quality, the two parties shall negotiate and select an arbitration institution. During the arbitration, the inspection shall be carried out in full accordance with the acceptance rules and test methods specified in this standard. bzxZ.net
5.5 The filling of dissolved acetylene cylinders shall be implemented in accordance with GB13591. The net weight of each bottle of dissolved acetylene is 5~7kg (referring to 401 type acetylene cylinders). 5.6 Dissolved acetylene products shall be batched with cylinders discharged at the same time, and the cylinders shall be the sampling unit. For cylinders below 100 (including 100 bottles), 5% of the cylinders shall be sampled. For cylinders greater than 100 to 500 (including 500 bottles), 2% of the cylinders shall be sampled for each additional 100 bottles. For cylinders above 500, 2% of the cylinders shall be sampled for each additional 100 bottles. Instructions:
, 17JISK1902--80 (confirmed in 1992) stipulates that 10% AgNO: test paper in a wet state shall be placed in the sample airflow to check whether it is colored within 10s*.
181
Sampling shall be carried out in increments of 1% of the gas cylinders.
6 Marking, labeling, packaging, transportation and storage GB 6819-
—1996
6.1 The marking, labeling and packaging of dissolved acetylene shall be carried out in accordance with the relevant provisions of the document No. 4 of Lao Guozi (1993) issued by the Ministry of Labor of the State. 6.2 All dissolved acetylene leaving the factory shall be accompanied by a product label indicating: product name, manufacturer name, factory address, trademark, production date, production license number, product standard number and qualified seal. 6.3 The color, font color, font and arrangement of the outer surface of dissolved acetylene gas cylinders shall comply with the provisions of GB7144. 6.4 The valves and fusible plugs on the dissolved acetylene gas cylinders shall be checked for leaks with soapy water. There shall be no leakage at any place, otherwise it shall not be allowed to leave the factory. 6.5 The transportation and storage of dissolved acetylene cylinders shall be handled in accordance with the relevant provisions of Chapter 7 of the Ministry of Labor’s Document No. 4 (1993). 7 Safety and Others
7.1 Safety Matters
Acetylene is a flammable and explosive gas. When using dissolved acetylene, the provisions of Article 64 of Chapter 7 of the Ministry of Labor’s Document No. 4 (1993) shall be followed.
7.2 Residual Pressure
The residual pressure of dissolved acetylene cylinders between -5℃ and +35℃ shall comply with Table 2. Table 2 Residual pressure of dissolved acetylene cylinders
Temperature, ℃
Minimum pressure, MPa
-5～0
0.05
0~10
0.1
10~25
0.2
If the inspection results do not meet the requirements of Table 2, the provisions of 5.2 of GB13591 shall apply. 182
25～40
0.3
6. Dissolved acetylene products should be divided into batches of gas bottles that are discharged at the same time, and the gas cylinders should be used as the sampling unit. Samples of less than 100 bottles (including 100 bottles) should be based on 5% of the gas bottles, and samples larger than 100 bottles to 500 bottles (including 500 bottles) should be taken as a batch. bottles), every additional 100 bottles are sampled at 2% of the gas cylinders, and every additional 100 bottles above 500 bottles are used:
, 17JISK1902--80 (confirmed in 1992) stipulates that 10% AgNO under humid conditions : Place the test paper in the sample airflow and check whether it is colored within 10 seconds*.
181
Sampling in 1% cylinder increments.
6 Signs, labels, packaging, transportation and storage GB 6819-
—1996
6.1 The signs, labels and packaging of dissolved acetylene shall be in accordance with the Labor Guozi (Lao Guo Zi) issued by the Ministry of Labor. The relevant provisions in Document No. 4 of 1993 shall be implemented. 6.2 All dissolved acetylene shipped from the factory should be attached with a product label, indicating: product name, manufacturer name, factory address, trademark, production date, production license number, product standard number and certification seal. 6.3 The color, lettering, lettering and arrangement of the outer surface of the dissolved acetylene gas cylinder should comply with the regulations of GB7144. 6.4 Use soapy water to detect leaks on the valves, fusible plugs, etc. on the dissolved acetylene cylinder. There must be no air leakage anywhere, otherwise it will not be allowed to leave the factory. 6.5 The transportation and storage of dissolved acetylene cylinders shall be handled in accordance with the relevant regulations in Chapter 7 of Document No. 4 of the Ministry of Labor, Lao Guo Zi (1993). 7 Safety and Others
7.1 Safety Matters
Acetylene is a flammable and explosive gas. When using dissolved acetylene, you should follow Article 64 of Chapter 7 of Document No. 4 of the Ministry of Labor (1993) Provisions are enforced.
7.2 Residual pressure
The residual pressure of the dissolved acetylene cylinder between -5℃+35℃ should comply with Table 2. Table 2 Residual pressure of dissolved acetylene cylinder
Temperature, ℃
Minimum pressure, MPa
-5～0
0.05
0~10| |tt||0.1
10~25
0.2
If the inspection results do not meet the requirements of Table 2, the regulations in 5.2 of GB13591 shall be followed. 182
25～40
0.3
6. Dissolved acetylene products should be divided into batches of gas bottles that are discharged at the same time, and the gas cylinders should be used as the sampling unit. Samples of less than 100 bottles (including 100 bottles) should be based on 5% of the gas bottles, and samples larger than 100 bottles to 500 bottles (including 500 bottles) should be taken as a batch. bottles), every additional 100 bottles are sampled at 2% of the gas cylinders, and every additional 100 bottles above 500 bottles are used:
, 17JISK1902--80 (confirmed in 1992) stipulates that 10% AgNO under humid conditions : Place the test paper in the sample airflow and check whether it is colored within 10 seconds*.
181
Sampling in 1% cylinder increments.
6 Signs, labels, packaging, transportation and storage GB 6819-
—1996
6.1 The signs, labels and packaging of dissolved acetylene shall be in accordance with the Labor Guozi (Lao Guo Zi) issued by the Ministry of Labor. The relevant provisions in Document No. 4 of 1993 shall be implemented. 6.2 All dissolved acetylene shipped from the factory should be attached with a product label, indicating: product name, manufacturer name, factory address, trademark, production date, production license number, product standard number and certification seal. 6.3 The color, lettering, lettering and arrangement of the outer surface of the dissolved acetylene gas cylinder should comply with the regulations of GB7144. 6.4 Use soapy water to detect leaks on the valves, fusible plugs, etc. on the dissolved acetylene cylinder. There must be no air leakage anywhere, otherwise it will not be allowed to leave the factory. 6.5 The transportation and storage of dissolved acetylene cylinders shall be handled in accordance with the relevant regulations in Chapter 7 of Document No. 4 of the Ministry of Labor, Lao Guo Zi (1993). 7 Safety and Others
7.1 Safety Matters
Acetylene is a flammable and explosive gas. When using dissolved acetylene, you should follow Article 64 of Chapter 7 of Document No. 4 of the Ministry of Labor (1993) Provisions are enforced.
7.2 Residual pressure
The remaining pressure of the dissolved acetylene cylinder between -5℃+35℃ should comply with Table 2. Table 2 Residual pressure of dissolved acetylene cylinder
Temperature, ℃
Minimum pressure, MPa
-5～0
0.05
0~10| |tt||0.1
10~25
0.2
If the inspection results do not meet the requirements of Table 2, the regulations in 5.2 of GB13591 shall be followed. 182
25～40
0.3
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