MT 454-1995 Specification for carbon dioxide absorbents for compressed oxygen breathing apparatus and compressed oxygen self-rescuers - calcium hydroxide
Some standard content:
Coal Industry Standard of the People's Republic of China
Carbon dioxide absorbent for compressed oxygen breathing apparatus and compressed oxygen self-rescuer
Calcium hydroxide technical conditions
Subject content and scope of application
MT 454-1995
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of carbon dioxide absorbent calcium hydroxide for compressed oxygen breathing apparatus and compressed oxygen self-rescuer. This standard applies to carbon dioxide absorbent and calcium hydroxide (hereinafter referred to as absorbent) for compressed oxygen breathing apparatus and compressed oxygen self-rescuer. 2 Reference standards
GB191 Pictorial symbols for packaging, storage and transportation
GB 8159 Carbon monoxide filter self-rescuer for mining GB/T8160 Test method for carbon monoxide filter self-rescuer for mining MT453 Isolation type compressed oxygen respirator
3 Terms
3.1 Absorption rate for carbon dioxide The percentage of carbon dioxide mass absorbed by a unit mass of calcium hydroxide sample within a specified time. 3.2 Moisture content
The percentage of water mass evaporated when a unit mass of calcium hydroxide sample is dried to constant weight at a certain temperature. 3.3 Strength
The firmness of calcium hydroxide particles to resist external impact and vibration without breaking, expressed by dust rate. 3.4 Dust rate
The percentage of dust mass generated by a unit mass of calcium hydroxide sample after the rolling screen test. 3.5 Roller sieve test Under specified conditions, the calcium hydroxide sample is placed in a container and rolled on a rotary impact test device, then the sample is taken out and sieved with a combined vibrating sieve.
3.6 Particle size
The provisions of the cross section and length of calcium hydroxide particles. 3.7 Carbon dioxide content Carbon dioxide content The mass percentage of carbon dioxide contained in the calcium hydroxide agent. 4 Technical requirements
4.1 The calcium hydroxide agent should have no odor.
4.2 Calcium hydroxide should be white particles in regular strip shape. 4.3 The carbon dioxide absorption rate should meet the following requirements: Approved by the Ministry of Coal Industry of the People's Republic of China on December 28, 1995 338
Implemented on April 1, 1996
MT 454—1995
a. The carbon dioxide absorption rate of calcium hydroxide used in compressed oxygen respirators should not be less than 30%; b. The carbon dioxide absorption rate of calcium hydroxide used in compressed oxygen self-rescuers should be no less than 32%. 4.4 The moisture content of calcium hydroxide reagents should be 16% to 20%. 4.5 The dust rate should comply with the following provisions:
a. The dust rate of calcium hydroxide used in compressed oxygen respirators should not be greater than 3%; b. The dust rate of calcium hydroxide used in compressed oxygen self-rescuers should not be greater than 2%. 4.6 The particle size range should comply with the following provisions:
a. For products with a circular cross section, the diameter of the particle cross section should be 3±0.5mm, and the length should be 4~7mmb. For products with a plum blossom cross section, the outer diameter of the particle cross section should be 3±1mm, and the length should be 3~10mm. 4.7 The carbon dioxide content of calcium hydroxide reagents should not be greater than 2.5%. 5 Test methods
5.1 Odor test
At 45~50℃, use membrane sensory inspection. 5.2 Color inspection
At 15~30℃, use visual organs to check. 5.3 Determination of carbon dioxide absorption rate
5.3.1 Reagent materials
a. Carbon dioxide gas, purity required to be above 97%, b. Sulfuric acid, chemically pure;
c. Anhydrous calcium chloride, analytically pure.
5.3.2 Instruments and equipment
a. Float flowmeter, 0~~0.5L/min, accuracy level is 2.5; b. Gas washing bottle, 250mL;
c. Drying tower, 250mL,
d. U-shaped with branch pipe, specification 13X100,
e. Balance, sensitivity is 0.1mg.
5.3.3 Determination steps
The test device is shown in Figure 1.
MT454—1995
Figure 1 Schematic diagram of the carbon dioxide absorption rate determination device 9
1—40L steel cylinder (containing compressed high-concentration CO, gas, concentration above 97%), 2-pressure reducer; 3-flow regulator; 4-capillary flowmeter (containing liquid paraffin), 5-gas washing bottle (containing concentrated sulfuric acid, d=1.84g/mL), 6-drying tower (containing anhydrous calcium chloride); 7-U-shaped absorption tube with branch (the front half contains calcium hydroxide sample, and the back half contains anhydrous calcium chloride saturated with carbon dioxide), 8-U-shaped absorption tube with branch (containing anhydrous calcium chloride) 9-triangular flask (containing tap water) Before the test, first fill the middle part of the U-shaped branch tube 7 with absorbent cotton, and the back half with anhydrous calcium chloride, and weigh their mass, then fill the front half with about 3g of the test sample, and weigh its mass again. The difference between the two weighing masses is the mass m1 of the test sample. Then connect the U-shaped branch pipe 7 to the device of Figure 1, turn on the switch of the steel cylinder, and then slowly turn on the switch of the pressure reducer 2, and make the flow of the two pipelines 170-180mL/min through the flow regulator 3; continue to ventilate for 1h, then turn off the switch of the pressure reducer 2, remove the U-shaped branch pipe 7 and weigh it, and record its mass m3.
5.3.4 Expression of measurement results
The absorption rate is calculated according to formula (1):
Xma= m2 × 100
Where: X-
Carbon dioxide absorption rate, %;
Mass of calcium hydroxide sample, g,
m—-Total mass of the U-shaped absorption tube before absorbing carbon dioxide, g; m3—Total mass of the U-shaped absorption tube after absorbing carbon dioxide, g. Parallel measurement of two samples, take their arithmetic mean as the measurement result. The measurement result is rounded to one decimal place. 5.3.5 Allowable difference
(1)
The difference between the parallel measurements in the same laboratory shall not exceed 2.5%. If one of the values is lower than the standard requirement, even if the difference between the two data is within 2.5%, it shall be re-measured once (two samples). If one of them is still unqualified, it shall be judged as unqualified. 5.4 Determination of moisture content
5.4.1 Reagents
a. Anhydrous calcium chloride, analytical grade,
b. Color-changing silica gel.
5.4.2 Instruments and equipment
a. Balance: sensitivity is 0.1mg;
b. Drying oven: maximum temperature is 300℃.
5.4.3 Determination steps
MT454—1995
Use a weighing bottle with a lid to weigh 5 to 8 g of calcium hydroxide sample (accurate to 0.01 mg), open the weighing bottle and put it into a drying oven preheated to 210±5℃ for 50 minutes, then take out the weighing bottle, put the cap back on, put it into a dryer and weigh it after cooling. The ratio of the mass difference of the sample before and after drying to the mass of the original sample is the moisture content. 5.4.4 Expression of determination results
The moisture content is calculated according to formula (2):
Where: S---moisture content, %;
The mass of the calcium hydroxide sample before drying, g; m5---the mass of the calcium hydroxide sample after drying, g. m - ms
Measure two samples at the same time and take their arithmetic mean as the determination result. The determination result is rounded to one decimal place. 5.4.5 Allowable difference
The difference between parallel measurements in the same laboratory shall not exceed 0.5%. 5.5 Determination of calcium hydroxide strength
5.5.1 Instruments and equipment
a The rotary impact test device is shown in Figure 2. It shall comply with the requirements of the rolling test device in Figure 7 of GB/T8160. Figure 2 Schematic diagram of the rotary impact test device
1--Small motor; 2-Reducer; 3-Wooden box (2)
The wooden box is a cube made of pine wood with a thickness of 18mm and an internal size of 300mm×300mm×300mm. Its speed should be 60±2 r/min.
b. Standard sieve specification 12 mesh, mesh size 1.6mm; c. Standard push vibrating screen machine, motor speed 1400 rpm, sieve shaking times 1400min1. 5.5.2 Determination steps
MT 454- 1995
Weigh three portions of 180±20g of calcium hydroxide sample, put them into three empty inner tanks of AZL-60 filter-type self-rescuer, press them on the wooden board, and then install two middle plates and a bottom plate without springs on it (install directly, do not spot weld or mold seal for disassembly), the degree of compression is equivalent to the state in the compressed oxygen self-rescuer or oxygen respirator purification tank, then buckle the outer shell, tighten the sealing tape with fine iron wire, put them together in a wooden box, start the rotary impact test device to make the wooden box roll for 3 minutes. Then put all the calcium oxide samples in the inner tank of the self-rescuer into a 12-mesh standard sieve and sieve and shake on a vibrating screen for 1 minute. 5.5.3 Determination of nesting expression
Dust rate is calculated according to formula (3):
F m ms= m × 100
Wherein, F dust rate, %;
The total mass of the calcium hydroxide sample before loading into the self-rescuer is more than the total mass of the calcium hydroxide sample after sieving and removing dust (screened material). The determination result is rounded to the decimal point.
5.6 Determination of particle size range
5.6.1 Instrument and equipment, vernier caliper, graduation value 0.02mm. ++ (3)
5.6.2 Determination method
Randomly select 20 particles from a representative calcium hydroxide sample, measure the cross-sectional diameter and length respectively with a caliper, and take the average value as the determination result.
5.7 Determination of carbon dinitride content
5.7.1 Test, materials
a. Anhydrous calcium fluoride, analytical grade;
Soda lime (Caoda lime), analytical grade, c. Sodium hydroxide (sodium hydroxide), chemically pure; tank. Sulfuric acid, chemically pure.
5.7.2 Instruments and equipment
a. Gas washing bottle, specification 500mL;
h. Separating funnel, specification 250mL,
c. Erlenmeyer flask, specification 250mL,
d. Condenser, specification 300mL;
e. U-shaped with branch pipe, specification 13X100
f. Bottom-mouth bottle, specification 5000mL;
n. Alcohol lamp,
h. Balance, sensitivity 0.1mg.
5.7.3 Determination steps
Test device: as shown in Figure 3:
MT454—1995
Figure 3 Schematic diagram of the test device for determining carbon dioxide content 1, 6—gas washing bottle, 2—separating funnel, 3—Erlenmeyer flask, 4—condenser; 5—U-shaped branch pipe U,, U, U317—lower bottle, 8—alcohol lamp Determination preparation: Fill the gas washing bottle 1 with about 1/3 of 30% caustic soda solution; U-shaped branch pipe: U, filled with anhydrous calcium chloride with a particle size of Φ3~5mm, Uz filled with The particle size is Φ3~5mm, about 1/3 of the lime, about 2/3 of the anhydrous calcium fluoride with a particle size of 3~5mm, separated by absorbent cotton, U: contains anhydrous calcium chloride with a particle size of Φ3~5mm, U1, Uz, and U are respectively plugged with rubber stoppers, weigh U, with a balance (accurate to 0.1mg), fill the lower bottle 7 with water, weigh 1g of the crushed calcium hydroxide sample (accurate to 0.1mg) with a clean and dry conical flask 3, and inject 50mL of 1:4 hydrochloric acid into the separatory funnel 2; install according to Figure 4, and note that the lime side of U should be connected to U,. Check the air tightness of the pipeline system.
Determination: First, pass water through the condenser, then open the water outlet of the lower bottle 7, and then slowly rotate the piston of the separatory funnel to drip hydrochloric acid into the conical flask. Adjust the speed of the water flowing from the lower bottle, gradually increase the dripping amount, and let it flow out within 5 minutes, so that 16 to 18 bubbles emerge from the washing bottle 1 per minute. When there is sediment in the conical flask and few bubbles emerge, gradually heat it with an alcohol lamp to make the solution boil slightly for about 8 to 10 minutes. Stop heating when no bubbles emerge in the bottle, continue to ventilate for 30 minutes, remove U, and weigh it (accurate to 0.1 mg). 5.7.5 Expression of determination results
The carbon dioxide content is calculated according to formula (4):
C = mio - mg
Where: C-carbon dioxide content in calcium hydroxide reagent, %; m-calcium hydroxide sample weight, g;
mg-U2 weight before test, g;
U weight after test, g.
The same batch of samples shall be measured twice and the arithmetic mean shall be taken as the measurement result. The measurement result shall be rounded to two decimal places. 5.7.6 Permissible difference
(4)
In the same laboratory, the difference between parallel measurements shall not exceed 0.30%. If one of the values is lower than the standard requirement, even if the difference between the two data is within 0.30%, it shall be re-measured. If one of the values is still unqualified, it shall be judged as unqualified. 343
6 Inspection rules
6.1 Factory inspection
MT 454—1995
6.1.1 Products shall be inspected batch by batch by the quality inspection department of the manufacturer. They may only leave the factory after passing the inspection and issuing a certificate of conformity. 6.1.2 Factory inspection items include 4.1, 4.2, 4.3, 4.4, 4.5, 4.6 and 4.7. 6.2 Type inspection
6.2.1 Type inspection shall be conducted in any of the following cases: a. When a new product or old product is transferred to a new factory for finalization and identification; b. When there are major changes in materials and processes after normal production, which may affect product performance; c. During normal production, it should be conducted once a year; d. When production is resumed after a one-year suspension; e. When there is a significant difference between the results of the export inspection and the last type inspection; f. When the national quality supervision agency makes a request. 6.2.2 Type inspection items include 4.3, 4.4, 4.5, 4.6, and 4.7. 6.2.3 Type inspection shall be conducted by the quality supervision agency authorized by the Ministry of Coal Industry. 6.3 Sampling and batching
Calcium hydroxide is divided into 600g by quartering method based on the shift output, and then packed into clean and dry glass bottles with ground stoppers or well-sealed plastic bottles.
6.4 Judgment rules
6.4.1 In the factory inspection, if one of the items in 4.3 and 4.4 is unqualified, it is judged as unqualified; if two of the other items are unqualified, it is judged as unqualified.
6.4.2 In the type inspection, if one of the items in 4.3, 4.4 and 4.5 is unqualified, the batch of products is judged as unqualified; if one of the items in 4.6 and 4.7 is unqualified, double sampling should be carried out for re-inspection of all items. If there is still one item that is unqualified, the batch of products is judged as unqualified. 7 Marking, packaging, transportation and storage
7.1 Marking
The following markings should be on the product nameplate:
a. Product name;
b. Production batch number;
c. Production date;
d. Shelf life;
e. Gross weight (net weight)bZxz.net
f. Manufacturer name (factory address);
g. Product performance certificate number;
h. Production license number;
i. Packaging, storage and transportation marks should comply with the provisions of GB191. 7.2 Packaging
The product should be sealed in metal barrels or plastic barrels, and vibration reduction measures should be taken to meet the requirements of transportation regulations. 7.3 Transportation
The packaged product should be suitable for railway, road, water and air transportation. 7.4 Storage
The product should be stored in a well-ventilated warehouse. 344
Additional instructions:
MT4541995
This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was drafted and interpreted by Fushun Branch of China Coal Research Institute and Beipiao Mining Bureau Calcium Hydroxide Plant. The main drafters of this standard are Ma Shanqing, Dong Yincai and Li Chuanhong.1. Test and materials
a. Anhydrous calcium fluoride, analytical grade;
Soda lime (Caoda lime), analytical grade; c. Sodium hydroxide (sodium hydroxide), chemically pure; flask. Sulfuric acid, chemically pure.
5.7.2. Instruments and equipment
a. Gas washing bottle, specification 500mL;
h. Separating funnel, specification 250mL;
c. Erlenmeyer flask, specification 250mL;
d. Condenser, specification 300mL;
e. U-shaped with branch pipe, specification 13X100
f. Bottom-mouth bottle, specification 5000mL;
n. Alcohol lamp;
h. Balance, sensitivity 0.1mg.
5.7.3 Determination steps
Test device: as shown in Figure 3:
MT454—1995
Figure 3 Schematic diagram of the test device for determining carbon dioxide content 1, 6—gas washing bottle, 2—separating funnel, 3—Erlenmeyer flask, 4—condenser; 5—U-shaped branch pipe U,, U, U317—lower bottle, 8—alcohol lamp Determination preparation: Fill the gas washing bottle 1 with about 1/3 of 30% caustic soda solution; U-shaped branch pipe: U, filled with anhydrous calcium chloride with a particle size of Φ3~5mm, Uz filled with The particle size is Φ3~5mm, about 1/3 of the lime, about 2/3 of the anhydrous calcium fluoride with a particle size of 3~5mm, separated by absorbent cotton, U: contains anhydrous calcium chloride with a particle size of Φ3~5mm, U1, Uz, and U are respectively plugged with rubber stoppers, weigh U, with a balance (accurate to 0.1mg), fill the lower bottle 7 with water, weigh 1g of the crushed calcium hydroxide sample (accurate to 0.1mg) with a clean and dry conical flask 3, and inject 50mL of 1:4 hydrochloric acid into the separatory funnel 2; install according to Figure 4, and note that the lime side of U should be connected to U,. Check the air tightness of the pipeline system.
Determination: First, pass water through the condenser, then open the water outlet of the lower bottle 7, and then slowly rotate the piston of the separatory funnel to drip hydrochloric acid into the conical flask. Adjust the speed of the water flowing from the lower bottle, gradually increase the dripping amount, and let it flow out within 5 minutes, so that 16 to 18 bubbles emerge from the washing bottle 1 per minute. When there is sediment in the conical flask and few bubbles emerge, gradually heat it with an alcohol lamp to make the solution boil slightly for about 8 to 10 minutes. Stop heating when no bubbles emerge in the bottle, continue to ventilate for 30 minutes, remove U, and weigh it (accurate to 0.1 mg). 5.7.5 Expression of determination results
The carbon dioxide content is calculated according to formula (4):
C = mio - mg
Where: C-carbon dioxide content in calcium hydroxide reagent, %; m-calcium hydroxide sample weight, g;
mg-U2 weight before test, g;
U weight after test, g.
The same batch of samples shall be measured twice and the arithmetic mean shall be taken as the measurement result. The measurement result shall be rounded to two decimal places. 5.7.6 Permissible difference
(4)
In the same laboratory, the difference between parallel measurements shall not exceed 0.30%. If one of the values is lower than the standard requirement, even if the difference between the two data is within 0.30%, it shall be re-measured. If one of the values is still unqualified, it shall be judged as unqualified. 343
6 Inspection rules
6.1 Factory inspection
MT 454—1995
6.1.1 Products shall be inspected batch by batch by the quality inspection department of the manufacturer. They may only leave the factory after passing the inspection and issuing a certificate of conformity. 6.1.2 Factory inspection items include 4.1, 4.2, 4.3, 4.4, 4.5, 4.6 and 4.7. 6.2 Type inspection
6.2.1 Type inspection shall be conducted in any of the following cases: a. When a new product or old product is transferred to a new factory for finalization and identification; b. When there are major changes in materials and processes after normal production, which may affect product performance; c. During normal production, it should be conducted once a year; d. When production is resumed after a one-year suspension; e. When there is a significant difference between the results of the export inspection and the last type inspection; f. When the national quality supervision agency makes a request. 6.2.2 Type inspection items include 4.3, 4.4, 4.5, 4.6, and 4.7. 6.2.3 Type inspection shall be conducted by the quality supervision agency authorized by the Ministry of Coal Industry. 6.3 Sampling and batching
Calcium hydroxide is divided into 600g by quartering method based on the shift output, and then packed into clean and dry glass bottles with ground stoppers or well-sealed plastic bottles.
6.4 Judgment rules
6.4.1 In the factory inspection, if one of the items in 4.3 and 4.4 is unqualified, it is judged as unqualified; if two of the other items are unqualified, it is judged as unqualified.
6.4.2 In the type inspection, if one of the items in 4.3, 4.4 and 4.5 is unqualified, the batch of products is judged as unqualified; if one of the items in 4.6 and 4.7 is unqualified, double sampling should be carried out for re-inspection of all items. If there is still one item that is unqualified, the batch of products is judged as unqualified. 7 Marking, packaging, transportation and storage
7.1 Marking
The following markings should be on the product nameplate:
a. Product name;
b. Production batch number;
c. Production date;
d. Shelf life;
e. Gross weight (net weight)
f. Manufacturer name (factory address);
g. Product performance certificate number;
h. Production license number;
i. Packaging, storage and transportation marks should comply with the provisions of GB191. 7.2 Packaging
The product should be sealed in metal barrels or plastic barrels, and vibration reduction measures should be taken to meet the requirements of transportation regulations. 7.3 Transportation
The packaged product should be suitable for railway, road, water and air transportation. 7.4 Storage
The product should be stored in a well-ventilated warehouse. 344
Additional instructions:
MT4541995
This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was drafted and interpreted by Fushun Branch of China Coal Research Institute and Beipiao Mining Bureau Calcium Hydroxide Plant. The main drafters of this standard are Ma Shanqing, Dong Yincai and Li Chuanhong.1. Test and materials
a. Anhydrous calcium fluoride, analytical grade;
Soda lime (Caoda lime), analytical grade; c. Sodium hydroxide (sodium hydroxide), chemically pure; flask. Sulfuric acid, chemically pure.
5.7.2. Instruments and equipment
a. Gas washing bottle, specification 500mL;
h. Separating funnel, specification 250mL;
c. Erlenmeyer flask, specification 250mL;
d. Condenser, specification 300mL;
e. U-shaped with branch pipe, specification 13X100
f. Bottom-mouth bottle, specification 5000mL;
n. Alcohol lamp;
h. Balance, sensitivity 0.1mg.
5.7.3 Determination steps
Test device: as shown in Figure 3:
MT454—1995
Figure 3 Schematic diagram of the test device for determining carbon dioxide content 1, 6—gas washing bottle, 2—separating funnel, 3—Erlenmeyer flask, 4—condenser; 5—U-shaped branch pipe U,, U, U317—lower bottle, 8—alcohol lamp Determination preparation: Fill the gas washing bottle 1 with about 1/3 of 30% caustic soda solution; U-shaped branch pipe: U, filled with anhydrous calcium chloride with a particle size of Φ3~5mm, Uz filled with The particle size is Φ3~5mm, about 1/3 of the lime, about 2/3 of the anhydrous calcium fluoride with a particle size of 3~5mm, separated by absorbent cotton, U: contains anhydrous calcium chloride with a particle size of Φ3~5mm, U1, Uz, and U are respectively plugged with rubber stoppers, weigh U, with a balance (accurate to 0.1mg), fill the lower bottle 7 with water, weigh 1g of the crushed calcium hydroxide sample (accurate to 0.1mg) with a clean and dry conical flask 3, and inject 50mL of 1:4 hydrochloric acid into the separatory funnel 2; install according to Figure 4, and note that the lime side of U should be connected to U,. Check the air tightness of the pipeline system.
Determination: First, pass water through the condenser, then open the water outlet of the lower bottle 7, and then slowly rotate the piston of the separatory funnel to drip hydrochloric acid into the conical flask. Adjust the speed of the water flowing from the lower bottle, gradually increase the dripping amount, and let it flow out within 5 minutes, so that 16 to 18 bubbles emerge from the washing bottle 1 per minute. When there is sediment in the conical flask and few bubbles emerge, gradually heat it with an alcohol lamp to make the solution boil slightly for about 8 to 10 minutes. Stop heating when no bubbles emerge in the bottle, continue to ventilate for 30 minutes, remove U, and weigh it (accurate to 0.1 mg). 5.7.5 Expression of determination results
The carbon dioxide content is calculated according to formula (4):
C = mio - mg
Where: C-carbon dioxide content in calcium hydroxide reagent, %; m-calcium hydroxide sample weight, g;
mg-U2 weight before test, g;
U weight after test, g.
The same batch of samples shall be measured twice and the arithmetic mean shall be taken as the measurement result. The measurement result shall be rounded to two decimal places. 5.7.6 Permissible difference
(4)
In the same laboratory, the difference between parallel measurements shall not exceed 0.30%. If one of the values is lower than the standard requirement, even if the difference between the two data is within 0.30%, it shall be re-measured. If one of the values is still unqualified, it shall be judged as unqualified. 343
6 Inspection rules
6.1 Factory inspection
MT 454—1995
6.1.1 Products shall be inspected batch by batch by the quality inspection department of the manufacturer. They may only leave the factory after passing the inspection and issuing a certificate of conformity. 6.1.2 Factory inspection items include 4.1, 4.2, 4.3, 4.4, 4.5, 4.6 and 4.7. 6.2 Type inspection
6.2.1 Type inspection shall be conducted in any of the following cases: a. When a new product or old product is transferred to a new factory for finalization and identification; b. When there are major changes in materials and processes after normal production, which may affect product performance; c. During normal production, it should be conducted once a year; d. When production is resumed after a one-year suspension; e. When there is a significant difference between the results of the export inspection and the last type inspection; f. When the national quality supervision agency makes a request. 6.2.2 Type inspection items include 4.3, 4.4, 4.5, 4.6, and 4.7. 6.2.3 Type inspection shall be conducted by the quality supervision agency authorized by the Ministry of Coal Industry. 6.3 Sampling and batching
Calcium hydroxide is divided into 600g by quartering method based on the shift output, and then packed into clean and dry glass bottles with ground stoppers or well-sealed plastic bottles.
6.4 Judgment rules
6.4.1 In the factory inspection, if one of the items in 4.3 and 4.4 is unqualified, it is judged as unqualified; if two of the other items are unqualified, it is judged as unqualified.
6.4.2 In the type inspection, if one of the items in 4.3, 4.4 and 4.5 is unqualified, the batch of products is judged as unqualified; if one of the items in 4.6 and 4.7 is unqualified, double sampling should be carried out for re-inspection of all items. If there is still one item that is unqualified, the batch of products is judged as unqualified. 7 Marking, packaging, transportation and storage
7.1 Marking
The following markings should be on the product nameplate:
a. Product name;
b. Production batch number;
c. Production date;
d. Shelf life;
e. Gross weight (net weight)
f. Manufacturer name (factory address);
g. Product performance certificate number;
h. Production license number;
i. Packaging, storage and transportation marks should comply with the provisions of GB191. 7.2 Packaging
The product should be sealed in metal barrels or plastic barrels, and vibration reduction measures should be taken to meet the requirements of transportation regulations. 7.3 Transportation
The packaged product should be suitable for railway, road, water and air transportation. 7.4 Storage
The product should be stored in a well-ventilated warehouse. 344
Additional instructions:
MT4541995
This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was drafted and interpreted by Fushun Branch of China Coal Research Institute and Beipiao Mining Bureau Calcium Hydroxide Plant. The main drafters of this standard are Ma Shanqing, Dong Yincai and Li Chuanhong.6 Allowable difference
(4)
In the same laboratory, the difference between parallel measurements should not exceed 0.30%. If one of the values is lower than the standard requirement, even if the difference between the two data is within 0.30%, it should be re-measured. If one of them is still unqualified, it is judged to be unqualified. 343
6 Inspection rules
6.1 Factory inspection
MT 454—1995
6.1.1 Products should be inspected batch by batch by the quality inspection department of the manufacturer. They can only be shipped after passing the inspection and issuing a certificate of conformity. 6.1.2 Factory inspection items include 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, and 4.7. 6.2 Type inspection
6.2.1 Type inspection should be carried out in any of the following situations: a. When a new product or old product is transferred to the factory for finalization and appraisal; b. After normal production, if there are major changes in materials and processes that may affect product performance; c. During normal production, it should be conducted once a year; d. When production is resumed after one year of suspension; e. When the results of the factory inspection are significantly different from those of the previous type inspection; f. When the national quality supervision agency makes a request. 6.2.2 Type inspection items include 4.3, 4.4, 4.5, 4.6, and 4.7. 6.2.3 Type inspection is conducted by the quality supervision agency authorized by the Ministry of Coal Industry. 6.3 Sampling and batching
Calcium hydroxide is divided into batches of 600g by quartering method based on the shift production, and then packed into clean and dry glass bottles with ground stoppers or well-sealed plastic bottles.
6.4 Judgment rules
6.4.1 In the factory inspection, if one of the items in 4.3 and 4.4 is unqualified, it is judged as unqualified; if two of the other items are unqualified, it is judged as unqualified.
6.4.2 In the type inspection, if any item in 4.3, 4.4, or 4.5 fails, the batch of products shall be judged as unqualified; if any item in 4.6 or 4.7 fails, double sampling shall be conducted for full-item re-inspection. If there is still one item that fails, the batch of products shall be judged as unqualified. 7 Marking, packaging, transportation, and storage
7.1 Marking
The following markings shall be on the product nameplate:
a. Product name;
b. Production batch number;
c. Production date;
d. Shelf life;
e. Gross weight (net weight)
f. Manufacturer name (factory address);
g. Product performance certificate number;
h. Production license number;
i. The packaging, storage and transportation marks shall comply with the provisions of GB191. 7.2 Packaging
The product shall be sealed in metal barrels or plastic barrels, and vibration reduction measures shall be taken to meet the requirements of transportation regulations. 7.3 Transportation
The packaged products shall be suitable for railway, road, water and air transportation. 7.4 Storage
The product shall be stored in a well-ventilated warehouse. 344
Additional instructions:
MT4541995
This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is drafted and interpreted by the Fushun Branch of the China Coal Research Institute and the Calcium Hydroxide Plant of the Beipiao Mining Bureau. The main drafters of this standard are Ma Shanqing, Dong Yincai and Li Chuanhong. 3456 Allowable difference
(4)
In the same laboratory, the difference between parallel measurements should not exceed 0.30%. If one of the values is lower than the standard requirement, even if the difference between the two data is within 0.30%, it should be re-measured. If one of them is still unqualified, it is judged to be unqualified. 343
6 Inspection rules
6.1 Factory inspection
MT 454—1995
6.1.1 Products should be inspected batch by batch by the quality inspection department of the manufacturer. They can only be shipped after passing the inspection and issuing a certificate of conformity. 6.1.2 Factory inspection items include 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, and 4.7. 6.2 Type inspection
6.2.1 Type inspection should be carried out in any of the following situations: a. When a new product or old product is transferred to the factory for finalization and appraisal; b. After normal production, if there are major changes in materials and processes that may affect product performance; c. During normal production, it should be conducted once a year; d. When production is resumed after one year of suspension; e. When the results of the factory inspection are significantly different from those of the previous type inspection; f. When the national quality supervision agency makes a request. 6.2.2 Type inspection items include 4.3, 4.4, 4.5, 4.6, and 4.7. 6.2.3 Type inspection is conducted by the quality supervision agency authorized by the Ministry of Coal Industry. 6.3 Sampling and batching
Calcium hydroxide is divided into batches of 600g by quartering method based on the shift production, and then packed into clean and dry glass bottles with ground stoppers or well-sealed plastic bottles.
6.4 Judgment rules
6.4.1 In the factory inspection, if one of the items in 4.3 and 4.4 is unqualified, it is judged as unqualified; if two of the other items are unqualified, it is judged as unqualified.
6.4.2 In the type inspection, if any item in 4.3, 4.4, or 4.5 fails, the batch of products shall be judged as unqualified; if any item in 4.6 or 4.7 fails, double sampling shall be conducted for full-item re-inspection. If there is still one item that fails, the batch of products shall be judged as unqualified. 7 Marking, packaging, transportation, and storage
7.1 Marking
The following markings shall be on the product nameplate:
a. Product name;
b. Production batch number;
c. Production date;
d. Shelf life;
e. Gross weight (net weight)
f. Manufacturer name (factory address);
g. Product performance certificate number;
h. Production license number;
i. The packaging, storage and transportation marks shall comply with the provisions of GB191. 7.2 Packaging
The product shall be sealed in metal barrels or plastic barrels, and vibration reduction measures shall be taken to meet the requirements of transportation regulations. 7.3 Transportation
The packaged products shall be suitable for railway, road, water and air transportation. 7.4 Storage
The product shall be stored in a well-ventilated warehouse. 344
Additional instructions:
MT4541995
This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Gas Detection and Rescue Equipment Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is drafted and interpreted by the Fushun Branch of the China Coal Research Institute and the Calcium Hydroxide Plant of the Beipiao Mining Bureau. The main drafters of this standard are Ma Shanqing, Dong Yincai and Li Chuanhong. 345
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