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MT/T 695-1997: General technical condition of high-ratio-foam fire extinguish agent for coal mine
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General technical condition of high-ratio-foam fire extinguish agent for coal mine
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MT/T 695-1997
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Basic data | Standard ID | MT/T 695-1997 (MT/T695-1997) | | Description (Translated English) | General technical condition of high-ratio-foam fire extinguish agent for coal mine | | Sector / Industry | Coal Industry Standard (Recommended) | | Classification of Chinese Standard | D09 | | Classification of International Standard | 73.1 | | Word Count Estimation | 12,186 | | Date of Issue | 12/30/1997 | | Date of Implementation | 7/1/1998 | | Summary | This standard specifies the classification of coal with high-expansion foam fire extinguishing agent, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage. This standard applies to coal with high-expansion foam fire extinguishing agent (hereinafter referred to as the extinguishing agent). | MT/T 6: ---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
General technical condition of high-ratio-foam fire extinguish agent for coal mine
People's Republic of China Coal Industry Standard
General technical requirements for high-expansion foam fire extinguishing agents for coal mines
1997-12-30 Approved.1998-07-01 Implementation
Approved by the Ministry of Coal Industry of the People's Republic of China
Contents
1 Scope 1
2 Definition 1
3 Classification 1
4 Technical requirements 1
5 Test method 2
6 Inspection rules 6
7 Marking, packaging, transportation, storage 6
Appendix A (standard appendix) Foam test device Figure 8
General technical requirements for high-expansion foam fire extinguishing agents for coal mines
1 Scope
This standard specifies the classification, technical requirements, test methods, inspection rules, signs, packaging, transportation, and
Storage, etc.
This standard applies to high-expansion foam fire extinguishing agents for coal mines (hereinafter referred to as fire extinguishing agents).
2 Definition
This standard uses the following definition.
2.1 Keroseneinertgas
A kerosene fuel mixed with air in a special combustion chamber is mixed with nitrogen, carbon dioxide and water vapor to produce a mixed wet
Inert gas.
2.2 foamtosolutionvolumeratio
The volume of the foam and the high-expanding foam fire extinguishing agent solution used to generate the foam (that is, the solution prepared by adding liquid high-expanding foam fire extinguishing agent to water,
Hereinafter referred to as the solution) volume ratio.
2.3 Stabilityoffoam
Under the specified conditions, a certain volume of foam bursts in half the time.
2.4 extractiveatio
The rate of solution detachment from the foam is expressed by the ratio of the volume of the solution precipitated from the foam to the volume of the foam within a certain period of time.
2.5 Use of agenttosolutionratio
Mass ratio of fire extinguishing agent in the prepared solution.
3 categories
Divided by the medium used to form the foam and its temperature
--- Ordinary type. Use air medium to foam, medium temperature is -5 ℃ ~ 40 ℃;
--- High temperature resistant type. Use fuel inert gas to foam, the temperature of the medium is 15 ℃ ~ 85 ℃.
4 Technical requirements
4.1 General requirements
4.1.1 The use temperature range of fire extinguishing agent is -5 ℃ ~ 40 ℃ for general type and 15 ℃ ~ 85 ℃ for high temperature resistance type.
4.1.2 The fire extinguishing agent shall be a homogeneous liquid.
4.1.3 The fire extinguishing agent should not be significantly irritating to the human body after being diluted with water, and should not have obvious toxicity to living beings, and the surfactants therein are easily reduced by living beings
Solution, no pollution to the environment.
4.2 Performance requirements
The performance of the extinguishing agent should meet the requirements in Table 1.
Table 1
Project technical indicators
1 Density (20 ℃), g/cm3 0.90 ~ 1.20
2 Viscosity (20 ℃), MPa · s 25
3 pH value (20 ℃) 6 ~ 8
4 Foam multiple, 500 times
5 Foam stability, min 90
6 Foam leaching rate (≥15min),% 15
7 Water-resistant hardness, degree of virtue 30
8 Use concentration of fire extinguishing agent,% 3 ~ 6
9 Fire performance
Time for extinguishing Class A fire, min 5
Time for extinguishing a Class B fire, min 3
10 Storage period (inspected by aging test) 2 years
5 Test method
5.1 Homogeneous inspection
5.1.1 Instrument
--- graduated cylinder. 250mL or 100mL;
--- Glass rod. 250 ~ 500mm.
5.1.2 Test procedure
5.1.2.1 Pour the fire extinguishing agent into a measuring cylinder, place it still, and inspect it visually.
5.1.2.2 Stir the fire extinguishing agent in the graduated cylinder with a glass rod and leave it still. Visually inspect the fire extinguishing agent after it has stabilized.
5.1.3 Conclusion
Both results were independent.
5.2 Toxicity check
According to the ingredients contained in the fire extinguishing agent, perform the method specified in the product standard.
5.3 Density determination
5.3.1 Instrument
--- Precision density meter. range is 0.900 ~ 1.200g/cm3;
--- thermometer; range is 0 ~ 50 ℃, division value is 0.5 ℃;
--- graduated cylinder. 250mL or 100mL;
--- Constant temperature water bath. constant temperature range is 0 ~ 100 ℃, temperature control accuracy is ± 1 ℃.
5.3.2 Test procedure
5.3.2.1 Control the temperature of the thermostatic water bath at 20 ± 1 ℃.
5.3.2.2 Slowly pour the uniformly mixed fire extinguishing agent into a dry and clean measuring cylinder.
Scrape it off with filter paper. Then put it vertically into the constant temperature water bath, the liquid level of the fire extinguishing agent should be lower than the water bath liquid level.
5.3.2.3 When the temperature is constant to 20 ° C ± 1 ° C, slowly put the upper end of the hand-held clean density meter into the fire extinguishing agent, and take a reading when the density meter is stable.
5.3.3 Results
Take the average of the two test results as the measurement result, the difference between the two test results should not be greater than 0.002g/cm3.
5.4 Viscosity determination
5.4.1 Instrument
Rotary Viscometer. Turntable range is 0 ~ 100, accuracy is ± 5%;
Freezing point thermometer. The range is -30 ℃ ~ 60 ℃, and the division value is 1 ℃;
High beaker. 250mL;
Graduated cylinder. 25mL, 250mL each;
Semiconductor cold trap. temperature control accuracy is ± 1 ℃;
50% ethanol in water.
5.4.2 Test procedure
5.4.2.1 Slowly inject the uniformly mixed 20mL fire extinguishing agent into the sleeve of the rotary viscometer, install the adapter of the rotary viscometer and the sleeve
It was installed in a rotary viscometer, and the sleeve was immersed in a 50% ethanol aqueous solution of a semiconductor cold trap.
5.4.2.2 Set the temperature of the semiconductor cold trap to -5 ° C, select an appropriate speed, and wait for the fire extinguishing agent to reach -5 ° C for 30 minutes before proceeding.
Line determination. The value indicated by the pointer during measurement should be between 20 and 90 scales.
5.4.2.3 If the pointer exceeds the above-mentioned scale range, the No. 1 rotor and the corresponding speed should be selected to extinguish the uniformly mixed.200 mL
The agent was poured into a 250mL high-type beaker, and then measured according to the above method. Read when the pointer is stable, multiply the reading by the coefficient of the rotor.
The viscosity value of the gunpowder.
5.4.3 Results
Take the average of the two test results as the measurement result, and the difference between the two measurement results should not exceed the error of the instrument.
5.5 pH measurement
5.5.1 Instruments and reagents
PH meter. range 0 ~ 14pH, accuracy 0.1pH;
Beaker. 50mL;
Thermometer. range 0 ~ 50 ℃, division value 0.5 ℃;
Volumetric flask. 250mL;
Laboratory water. secondary water;
pH reference reagent;
Sodium tetraborate (Na2B4O7 · 10H2O) pH9.182 (25 ℃)
Mixed phosphate (equivalent molar mixture of KH2PO4 and NaH2PO4) pH 6.864 (25 ° C)
Potassium hydrogen phthalate (KHC3H4O4) pH 4.003 (25 ° C)
5.5.2 Preparation
5.5.2.1 Prepare 250mL buffer solution with pH reference reagent and laboratory water.
5.5.2.2 Debugging the acidity meter
5.5.3 Test procedure
5.5.3.1 Inject 35 mL of fire extinguishing agent into a dry, clean beaker.
5.5.3.2 Immerse electrodes in fire extinguishing agent.
5.5.3.3 When the fire extinguishing agent is at a constant temperature of 20 ° C ± 0.5 ° C, measure the pH value of the fire extinguishing agent which is stirred uniformly.
5.5.4 Results
Take the average of the two test results as the measurement result, the difference between the two test results should not be greater than 0.1pH.
5.6 Foam multiple, foam leaching rate and foam stability
5.6.1 Instruments, equipment and materials
Stopwatch. accuracy is 0.1s;
Thermometer. The range is 0 ~ 100 ℃, and the division value is 1 ℃;
Bench scale. range is 10kg, accuracy is 5g;
Graduated cylinder. 1000mL range, 10mL division, 100mL range, 1mL division, 10mL range, and division value
0.1mL;
Wooden foam scraper;
Standard high magnification foam test system (see Appendix A).
5.6.2 Preparation
5.6.2.1 Before the test, wash the standard high multiple foam test system with clean water to exclude the remaining water.
5.6.2.2 The standard high-power foam test system is assembled, and there shall be no leakage in the entire system.
5.6.2.3 The outlet air volume of the medium source is 0.25m3/min.
5.6.2.4 Using 20 ℃ ± 2 ℃ water, adjust the outlet pressure of the nozzle water to be 0.1 ± 0.02MPa, and the flow rate to be 6.0 ± 0.2L/min.
5.6.2.5 Sample preparation
Prepare a 300mL solution in a graduated cylinder according to the specified concentration of fire extinguishing agent.
Pressurized solution storage tank.
5.6.3 Test procedure
5.6.3.1 According to the air volume and flow specified in 5.6.2, start foaming after foaming. After foaming is normal, use a stopwatch to record that the foam is filled with 0.05m3 foam bucket.
time.
Foam multiple N is calculated according to formula (1);
N =
2.4 × 105
Q · t
(1)
Where.
Q --- Standard high magnification foam test system solution flow;
t --- time for foam to fill 0.05m3 foam bucket, s.
5.6.3.2 After the foam is filled with a 0.05m3 foam bucket, scrape it with a wooden board. After removing the foam on the outer wall, place the foam bucket on the stand immediately.
On the bottom, a 100mL graduated cylinder is placed under the stand to receive the foaming liquid. At 15min, the foam
volume.
The foam leaching rate ρ is calculated according to formula (2).
ρ (%) =
0.05 × 100
(2)
Where.
V --- the volume of foam precipitation solution, m3
0.05 --- The volume of foam bucket, m3.
5.6.3.3 Record the time when the foam rupture volume in a 0.05m3 foam bucket is reduced to half.This time is the foam stability.
Bit is min.
5.6.4 Results
The average value of the test results of foam multiple, foam leaching rate and foam stability were taken as the measurement results.
5.7 Water hardness test
5.7.1 Instruments, equipment and materials
Stopwatch. accuracy is 0.1s;
Thermometer. The range is 0 ~ 100 ℃, and the division value is 1 ℃;
Bench scale. range is 10kg, accuracy is 5g;
Simple measurement. the range is 1000mL, the division value is 10mL; the range is 100mL, the division value is 1mL; the range is 10mL, the division value is
0.1mL;
Wooden foam scraper;
Standard high magnification foam test system (see Appendix A).
5.7.2 Preparation
5.7.2.1 Carry out according to 5.6.2.1, 5.6.2.2, 5.6.2.3 and 5.6.2.4.
5.7.2.2 Sample preparation
Prepare 300mL solution in a graduated cylinder with water with a degree of greater than 30, stir well, filter through a 80-100 mesh filter and pour into a pressure-resistant solution.
Liquid storage tank.
5.7.3 Test procedure
According to the methods of 5.6.3.1, 5.6.3.2 and 5.6.3.3, the foam multiple, foam leaching rate and foam stability were measured.
5.7.4 Results
Take the average of the two test results as the measurement result.
5.8 Determination of the use concentration of fire extinguishing agent
5.8.1 Instruments, equipment and materials
Stopwatch. accuracy is 0.1s;
Thermometer. The range is 0 ~ 100 ℃, and the division value is 1 ℃;
Bench scale. range is 10kg, accuracy is 5g;
Graduated cylinder. 1000mL range, 10mL division, 100mL range, 1mL division; 10mL range, division value
0.1mL;
Wooden foam scraper;
Standard high magnification foam test system (see Appendix A).
5.8.2 Preparation
5.8.2.1 Carry out according to 5.6.2.1, 5.6.2.2, 5.6.2.3 and 5.6.2.4.
5.8.2.2 Sample preparation
Within the specified concentration range of the fire extinguishing agent, take two different concentrations of the upper limit and the lower limit, and prepare 300mL of solution in each graduated cylinder.
After mixing well, use a 80-100 mesh strainer to filter into the pressure-resistant solution storage tank.
5.8.3 Test procedure
According to the methods of 5.6.3.1, 5.6.3.2 and 5.6.3.3, the foam multiple, foam leaching rate and foam stability were measured.
5.8.4 Results
Take the average of the test results of foam multiple, foam leaching rate and foam stability twice as the measurement results. Two different use concentrated
Foam multiple, foam leaching rate and foam stability under the temperature should all meet the requirements of Table 1.
5.9 Fire performance test
5.9.1 Equipment, instruments, materials
Stopwatch. accuracy is 0.1s;
Thermometer. The range is 0 ~ 100 ℃, and the division value is 1 ℃;
Standard high magnification foam test system (see Appendix A).
No. 90 gasoline (research method octane number) or No. 70 gasoline (motor octane number), 20L;
Pine wood. 70, moisture content should be 10% ~ 15%, specifications are (30 ± 3) mm × (30 ± 3) mm × (730 ± 5) mm;
Class B fire 1.0m2 combustion disk (see Appendix Figure A2).
Class A fire wood grid and combustion table (see Appendix Figure A3).
5.9.2 Test procedure
The fire performance test is divided into Class B fire extinguishing test and Class A fire extinguishing test.
Preparations are carried out in accordance with 5.6.2.1, 5.6.2.2, 5.6.2.3 and 5.6.2.4.
5.9.2.1 Test procedures for Class B fire suppression
--- Put about 130mL of tap water (or a water depth of about 8cm) and 20L of No. 90 car into a clean Class B fire 1.0m2 burner.
Gasoline or No. 70 gasoline.
--- Ignition, start timing;
--- After 30 seconds of pre-ignition, foam fire extinguishing.
--- After continuous foaming for 2.5min, stop foaming;
--- Fire Extinguishing Time. The time from the start of foam fire extinguishing until the flame is completely extinguished is the fire extinguishing time.
5.9.2.2 Test procedures for Class A fire suppression
--- Put 70 pine wood on a Class A fire burning table according to the requirements of Appendix A, Figure 3, and put 1.5L90 in a Class A fire burning plate
Motor gasoline or gasoline 70;
--- Ignition, start timing;
--- After 100s of pre-ignition, perform foam fire extinguishing;
--- After continuous foaming for 5min, stop foaming.
--- Within 10min after stopping the foam, observe whether it re-ignites;
--- Fire Extinguishing Time. The time from foam extinguishing to complete flame extinction is the fire extinguishing time.
5.9.3 Results
Class B and A fire extinguishing tests shall be conducted three times each and shall be qualified twice.
5.10 Aging test
Put the solution into a 10L container, put it in a 65 ± 2 ℃ constant temperature box for 216h, return to room temperature, and then put it in -18 ± 2 ℃
Keep in the low temperature box for 24 hours, and then return to room temperature to perform all tests except the aging test.
6 Inspection rules
Inspection is divided into factory inspection and type inspection.
6.1 Sampling
6.1.1 Taking the same production batch as the sampling unit, the total amount of samples shall not be less than 10L.
6.1.2 The samples for type inspection shall be taken from the products that pass the factory inspection, and the total sample shall not be less than 50L.
6.1.3 The sampling should be representative, and the sample should be consistent with the overall.The product in the package should be shaken evenly before sampling.
Take an equal amount of sample from the packaging. Before each test, the sample should be shaken evenly before testing.
6.2 Factory inspection
Including density, viscosity, pH value, water hardness, foam ratio, foam leaching rate, concentration of fire extinguishing agent, foam stability and Class B fire
Fire extinguishing performance and other items.
6.3 Type inspection
Including all technical requirements items specified in Table 1 of Article 4.2 of this standard. In any of the following cases, a type test is required.
--- When new products are identified or old products are transferred to the factory for production;
--- After formal production, if major changes in raw materials and processes may affect product performance;
--- Periodic inspection during normal production;
--- Long-term production suspension, when production resumes;
--- When the national quality supervision agency puts forward the requirements for type inspection.
6.4 Determination of inspection results
The results of factory inspection or type inspection must meet the technical requirements in Chapter 4 of this standard.
Samples are taken from the packaging. If there is still one unqualified after re-inspection, it is judged as unqualified product.
7 Marking, packaging, transportation, storage
7.1 Signs
The packing barrel must be clearly and firmly marked with the manufacturer's name, product name, trademark, model, mixing ratio, production date or production batch number, and
Grid marking, quality or volume, number of this standard and storage requirements.
7.2 Packaging
7.2.1 High-expansion foam fire extinguishing agent shall be packed in iron drums or polyethylene plastic drums, and shall meet the requirements specified in Table 2.
Table 2
Packaging specifications
Packaging requirements
Packing error
L1
100 round iron drum coated with red paint on the outer wall, anti-corrosion treatment on the inner wall ± 0.5
50 plastic drums plus wooden crate protection for long distance transportation ± 0.5
25 plastic barrels plus wooden crate protection for long distance transportation ± 0.2
7.2.2 The package must be accompanied by instructions and a certificate of conformity.
7.3 Transport and storage
7.3.1 The product shall not be mixed with other substances and other types of fire extinguishing agents during transportation and storage.
7.3.2 The product should be stored in a cool, dry warehouse to prevent exposure, and the storage environment temperature should be within the specified operating temperature range.
7.3.3 The storage period of the product in the above environment is 2 years, and its performance indicators must not be lower than the technical requirements specified in this standard.
Appendix A
(Standard appendix)
Diagram of foam test device
1-media source; 2-air tube (ϕ150 × 500mm, iron tube); 3-nozzle (bore diameter. ϕ1.5mm);
4-pressure-resistant infusion gas hose (ϕ15); 5-float flowmeter (LEJ0 ~ 60); 6-steel pressure-resistant solution storage tank;
7- compressed air source (oxygen bottle or air compressor); 8-foam net (cotton thread net, aperture 2mm × 2mm);
9-foam receiving barrel (transparent plexiglass); 10- liquid analysis hole (ϕ5mm); 11- measuring cylinder;
12-foam receiving bucket bracket; 13-caster (MP50); 14-bracket (40 × 4);
15-caster (MP60); 16-bench (40 × 4); 17-caster (MP60)
Figure A1 6.0 ± 0.21L/min standard high multiple foam fire extinguishing test system
Fig. A2 Type B fire 1.0m2 combustion disk
1-90 pine fence (pine size. 30 × 35 × 730);
2-A type fire burning bench (50 × 4);
3-A type fire burning plate (size 730 × 730)
Figure A3 Schematic diagram of Class A fire wood grid and combustion table
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