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GB 38451-2019

Chinese Standard: 'GB 38451-2019'
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BASIC DATA
Standard ID GB 38451-2019 (GB38451-2019)
Description (Translated English) Respiratory protection--Self-contained open-circuit compressed air breathing apparatus for escape
Sector / Industry National Standard
Classification of Chinese Standard C73
Classification of International Standard 13.340.30
Word Count Estimation 18,128
Date of Issue 2019-12-31
Date of Implementation 2020-07-01
Drafting Organization Institute of Chemical Defense, Academy of Military Sciences, Institute of Military Engineering, Academy of System Engineering, Academy of Military Sciences, Mei SiAn (China) Safety Equipment Co., Ltd., Shanghai Baoya Safety Equipment Co., Ltd., Honeywell Safety Equipment (Shanghai) Co., Ltd. the company
Administrative Organization Ministry of Emergency Management of the People's Republic of China
Regulation (derived from) National Standards Bulletin No. 17 of 2019
Proposing organization Ministry of Emergency Management of the People's Republic of China
Issuing agency(ies) State Administration of Market Supervision and Administration, National Standardization Administration

GB 38451-2019
Respiratory protection--Self-contained open-circuit compressed air breathing apparatus for escape
ICS 13.340.30
C73
National Standards of People's Republic of China
Respiratory self-sufficient open-circuit compressed air
Escape breathing apparatus
2019-12-31 release
2020-07-01 implementation
State Administration of Market Supervision
Published by the National Standardization Administration
Contents
Foreword I
1 range 1
2 Normative references 1
3 Terms and definitions 1
4 Classification, grading and marking 2
5 Technical requirements 3
6 Test method 7
7 Identification and packaging 14
References 15
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed and managed by the Ministry of Emergency Management of the People's Republic of China.
This standard was drafted. Institute of Chemical Defense, Academy of Military Sciences, Institute of Military Engineering Technology, Academy of System Engineering, Academy of Military Sciences, Mays
(China) Safety Equipment Co., Ltd., Shanghai Baoya Safety Equipment Co., Ltd., Honeywell Safety Equipment (Shanghai) Co., Ltd.
the company.
The main drafters of this standard. Yang Xiaobing, Wang Chunyu, Zhang Mingming, Fu Yahui, Yao Haifeng, Zhang Shouzheng, Ma Chuang, Wang Desheng, Zhou Chuan, Yan Xiaoshan,
Ding Songtao, Wu Lei, Liu Ruimin, Lu Yukun.
Respiratory self-sufficient open-circuit compressed air
Escape breathing apparatus
1 Scope
This standard specifies the classification, classification, marking, technical requirements, test methods, identification and identification of self-sufficient open-circuit compressed air respirators for escape.
package.
This standard applies to self-sufficient open-circuit compressed air respirators for emergency escape in work and public places.
This standard does not apply to oxygen respirators, diving respirators, and self-contained open-circuit compressed air respirators for work.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 529-2008 Determination of tear strength of vulcanized rubber or thermoplastic rubber (trousers, right angles and crescents)
GB/T 2410 Determination of light transmittance and haze of transparent plastics
GB 2626-2006 Respiratory protective equipment
GB 2890-2009 Respiratory self-priming filter gas mask
GB 3836.1-2010 Explosive environment Part 1. General requirements for equipment
GB/T 5099-1994 steel seamless gas cylinder
GB/T 7307-2001 55 ° unsealed pipe thread
GB/T 12586-2003 Rubber or plastic coated fabrics-Determination of flexural damage resistance
GB/T 12903-2008 Terms for personal protective equipment
GB/T 13277.1 Compressed air Part 1. Pollutant purification level
GB/T 16556-2007 self-contained open-circuit compressed air respirator
GB/T 18664-2002 Selection, use and maintenance of respiratory protective equipment
GB/T 23465-2009 Practical performance evaluation of respiratory protective equipment
GB/T 28053 Compound gas cylinder for respirator
3 terms and definitions
The terms and definitions defined in GB/T 12903-2008 and GB/T 18664-2002 and the following terms apply to this document.
3.1
Self-contained open-circuit compressed air escape respirator
forescape
With its own compressed air source, it can provide clean air for personnel to breathe. The exhaled gas is directly discharged into the atmosphere for escape.
A respirator.
3.2
Hood
It can completely cover the head, eyes, nose, mouth to neck, and can also cover part of the shoulders or non-tight masks used in conjunction with protective clothing.
Note. Rewrite GB/T 18664-2002, definition 3.1.12.
3.3
Full facepiece
A close-fitting mask that covers the mouth, nose, eyes, and jaw.
[GB 2626-2006, definition 3.8]
3.4
Rated working time
Respirator operating time determined under specified test conditions.
3.5
Static pressure
After the positive pressure device of the air supply valve is opened, the pressure in the mask when the system air circuit is balanced.
[GB/T 16556-2007, definition 3.5]
4 Classification, grading and marking
4.1 Classification
Divided into two types according to the mask type, as follows.
a) Full-face-type self-contained open-circuit compressed air escape breathing apparatus, marked with the code. FF;
b) Hood-type self-contained open-circuit compressed air escape breathing apparatus, marked with code. H.
4.2 Classification
According to the rated protection time (t), it is divided into four levels of 10min, 15min, 20min, and 30min, of which.
a) 10min≤t <15min, marking code. 10;
b) 15min≤t <20min, marking code. 15;
c) 20min≤t <30min, marking code. 20;
d) t≥30min, marking code. 30.
4.3 Marking
The product mark consists of five parts. name, this standard number, mask type, cylinder category and rated protection time. Mask type mark generation
See 4.1 and 4.2 for code numbers and rated protection time marks. The letters F and G represent composite gas cylinders and steel gas cylinders, respectively.
Example 1. Full-faced self-contained open-circuit compressed air escape respirator, using a composite gas cylinder, with a rated protection time of 15min ~ 20min, which is marked as.
Escape breathing apparatus GB 38451-FF-F-15
The meaning of each element in the mark is as follows.
FF --- full face mask;
F --- composite gas cylinder;
15 --- The rated protection time is 15min ~ 20min.
Example 2. A hood-type self-contained open-circuit compressed air escape respirator using a steel gas cylinder with a rated protection time of 10min ~ 15min, which is marked as.
Escape breathing apparatus GB 38451-HG-10
The meaning of each element in the mark is as follows.
H --- hood;
G --- steel cylinder;
10 --- The rated protection time is 10min ~ 15min.
5 Technical requirements
5.1 Design requirements
Check in accordance with 6.2 and evaluate in 6.12.The design of the respirator should meet the following requirements.
a) Respirators should be simple, compact, reliable, and easy to inspect based on information provided by the manufacturer;
b) The respirator should have no protruding parts or sharp edges, and the respirator should not be hung when the wearer passes through a narrow passage;
c) The surface of the parts of the respirator that may come into contact with the wearer should be free of sharp edges and burrs;
d) the respirator should be able to maintain its full function when in any direction;
e) The respirator should be easy to wear and put into use, and it can be worn quickly even in adverse conditions such as dark and confined spaces;
f) The installation position of the cylinder valve of the respirator should be convenient for the wearer to quickly open the cylinder valve;
g) the respirator should have a device for filtering impurities in the compressed air;
h) The respirator should be able to display the cylinder pressure in real time.
5.2 Material requirements
Check in accordance with 6.2 and evaluate in 6.12.The respirator material should meet the following requirements.
a) The materials used in the respirator should have appropriate mechanical strength and corrosion resistance;
b) The materials used in the respirator should be resistant to the cleaning agents and disinfectants recommended by the manufacturer without significant damage after cleaning and disinfection;
c) Materials on the respirator that may come into direct contact with the user's skin should be non-irritating to the skin and not harmful to health;
d) If the manufacturer declares that the product can be used in a flammable and explosive environment, bare parts on the respirator should not use aluminum, magnesium, titanium and their alloys;
e) If the manufacturer declares that the product can be used in a flammable and explosive environment, the surface resistance of the respirator backing material must not exceed 1 × 109Ω.
Method test of 26.13 in GB 3836.1-2010.
5.3 Performance requirements
5.3.1 Quality
After the cylinder is filled with gas, the overall weight of the respirator (excluding the carrying case) should not exceed 6.5kg.
5.3.2 Rated protection time
Tested according to the method of 6.5, the rated protection time of the respirator should meet the classification requirements of its mark.
5.3.3 Respiratory resistance
Tested according to method 6.6, the respiratory resistance of the respirator should meet the following requirements.
a) For a hood-type respirator, when the cylinder is full pressure to 5MPa, the breathing frequency is 40 times/min, the tidal volume is 2.5L/breath, and the breath is exhaled
Both resistance and suction resistance should not be greater than 1000Pa. When the cylinder pressure is 5MPa ~ 1MPa, the breathing rate is 25 times/min.
The tidal volume is 2L/breath, the exhalation resistance and the inhalation resistance should not be greater than 500Pa.
b) For full-face respirator, when the pressure of the cylinder reaches 5MPa, the breathing frequency is 40 times/min, and the tidal volume is 2.5L/breath.
Positive pressure should be maintained in the mask. When the cylinder pressure is 5MPa ~ 1MPa, the breathing frequency is 25 times/min, and the tidal volume is 2L/time.
Inhalation and exhalation resistance should not be greater than 800Pa.
5.3.4 Carbon dioxide content in inhaled gas
Tested according to method 6.7, the content of carbon dioxide in the inhaled gas should not exceed 1.8%.
5.3.5 Leak rate
Tested according to method 6.8, the leakage rate of the respirator should meet the following requirements.
a) For full-face respirators, the average leak rate for at least 8 of the 10 subjects should not exceed 0.01%.
b) For hood-type respirators, the average leakage rate (oral and nasal area) of at least 8 of the 10 subjects should not exceed 0.05%.
5.3.6 Temperature resistance
5.3.6.1 General requirements
The respirator should work without failure at -15 ℃ ~ 60 ℃. Respirators for special temperature ranges shall be tested and marked as specified
Temperature conditions. The respirator should meet the breathing resistance specified in 5.3.6.2 and 5.3.6.3 under the maximum and minimum temperatures in the specified temperature range.
5.3.6.2 Low-temperature respiratory resistance
According to the method of 6.6.4, the hood type respirator requires that the low-temperature inhalation resistance should not exceed 500Pa, and the low-temperature exhalation resistance should not exceed 700Pa;
Full-facepiece respirators require that positive pressure be maintained in the full-facepiece at all times, and low-temperature exhalation resistance should not exceed 1000Pa.
5.3.6.3 High-temperature breathing resistance
Tested according to 6.6.5, the hood type respirator requires that the high-temperature inhalation resistance should not exceed 500Pa, and the exhalation resistance should not exceed 700Pa;
Full-facepiece respirators require that positive pressure be maintained in the full-facepiece at all times, and high-temperature exhalation resistance should not exceed 1000Pa.
5.3.7 Static pressure
Tested according to the method of 6.9, under equilibrium conditions, the pressure in the cavity of the full face mask should not be greater than 500Pa.
Note. This indicator is for full-face respirators only.
5.3.8 Air tightness
Tested according to the 6.10 method, the respirator (excluding the mask) should be tested for air tightness under a positive pressure of 750Pa. After the pressure stabilizes, the pressure becomes
It should be no more than 30Pa within 1min.
5.3.9 Flammability
Test sequentially in accordance with 6.11, 6.10, and 6.6.All parts of the respirator that may be exposed to the flame should have flame retardant properties.
The burning time should be no more than 5s. After the test, the respirator should still maintain air tightness, meet the requirements of 5.3.3 respiratory resistance, and there should be no interruption of air supply
phenomenon.
5.3.10 Practical performance
According to the method of 6.12, under the conditions of simulated use, for the performance that is difficult to evaluate by other test methods, subjective evaluation is provided by the subject.
The following requirements should be met.
a) The respirator should be tested under normal conditions for normal temperature practical performance and low temperature practical performance;
b) In any activity, if any subject fails to complete the specified activity because the respirator is not suitable for its intended use, then
Find the respirator unqualified;
c) If the respirator fails the test, the laboratory shall describe the test method in detail so that other laboratories can repeat the test process.
5.3.11 Mechanical strength
Tested according to the methods of 6.4 and 6.6, the respirator should have no visible damage after vibration treatment, and the breathing resistance should meet the requirements of 5.3.3.
5.4 Component requirements
5.4.1 Mask
5.4.1.1 Hood
The hood should meet the following requirements.
a) The hood and breathing hose should be firmly connected, and the hood design should be easy to remove. In practical performance tests, the hood should remain stable on the head
Stable (use headband if necessary) and comfortable.
b) The window of the hood should be firmly combined with the hood material. In the practical performance test, the window should ensure that the field of view is not distorted and the field of view is not affected
To the effect, fogging of the window should not seriously damage the vision of the hood. When the surface of the window is sprayed with anti-fog material, the material should
His performance has no effect, and it is non-irritating to the skin and harmless to health.
c) The impact resistance of the window should be tested according to the method specified in 6.13 of GB 2626-2006 to ensure that the window has no impact after impact.
Breakdown and no cracking. After the test, the leakage rate test shall be performed in accordance with the requirements of 5.3.5.
d) Tested in accordance with GB/T 12586-2003 Method B. The sample of the hood material (excluding the window and neck seal) has been flexed 5000 times.
There should be no visible damage after scratching.
e) Tested in accordance with GB/T 529-2008 Method B (using a right-angled specimen with a notch), the hood material (excluding the window and neck seals)
Sealing ring) The tear strength of the sample is not less than 20N.
f) According to the method of 6.13, the joint strength of the hood material should not be less than 30N.
g) On the premise of ensuring that the protective performance and use performance meet the requirements, the hood can include a water blocking hood and an exhalation valve to increase the
Comfort.
5.4.1.2 Full face mask
Full face masks should meet the following requirements.
a) The full-face tight-fitting frame should closely fit the contours of the human face without obvious tenderness; the full-face fixing system should have sufficient strength
And elastic, and should be adjustable according to the needs of the wearer. The combined strength of the fixing system and the full face mask should not be less than 50N. test
In accordance with the provisions of 6.2, 6.12 and 6.13.
b) According to the method of 6.8 in GB 2890-2009, the full-face mask should have a wide field of vision, and the vision should be true without distortion. Total visual field retention is not small
At 70%, the binocular visual field retention rate is not less than 55%, and the lower visual field is not less than 35 °.
c) Tested in accordance with the method of GB/T 16556-2007 Appendix B, the full-face lens should be able to withstand a speed of 44.2m/s and a diameter of 3mm
The impact of the steel ball should be no visible cracks or broken after the test.
d) According to the method in GB/T 2410, the light transmittance of the full-face lens should not be less than 85%.
5.4.2 Air supply valve
Check in accordance with 6.2, the air supply valve should have an active positive pressure mechanism.
Note. Only full-face respirators contain this part.
5.4.3 Connections
The connection should meet the following requirements.
a) In accordance with the methods of 6.2 inspection and 6.12 test, the connection parts of the respirator should be easy to remove in order to facilitate cleaning, inspection and testing.
All removable connectors shall be easily connected and tightened by hand after removal. Disconnects during normal use and maintenance
When used, the seals used should not fall off or shift.
b) Checked in accordance with 6.2 and 6.12, the distortion of the breathing tube of the respirator should not affect the installation of the connector or the performance of the respirator
Can, or cause detachment of the breathing tube. The structure of the connection should prevent accidental interruption of the air supply.
c) Tested in accordance with 6.13.The strength of the combination
Not less than 250N. The bonding strength between the breathing tube and the hood should be not less than 50N.
d) Check in accordance with 6.2. The high, medium and low voltage connections shall not be interchangeable.
5.4.4 Respiratory catheter
The breathing tube should meet the following requirements.
a) According to the test of 6.14, the air flow reduction should not be greater than 10% under the pressure of the breathing tube. After 5 minutes of pressure relief,
Check according to 6.2, the breathing catheter should be free of air leakage and deformation.
b) Tested in accordance with 6.12, the breathing tube should not obstruct the free movement of the wearer's head and not interfere with its connection to the mask.
In accordance with GB/T 23465-2009.
5.4.5 Pressure reducer
Check in accordance with 6.2, the respirator should be equipped with a pressure reducer to ensure that downstream components can withstand the pressure after decompression. When downstream components cannot support
When receiving the full pressure of the pressure reducer, a pressure relief valve should be provided. When setting a pressure relief valve, the pressure relief valve should meet the following requirements.
a) Tested according to the method of 6.15.1, the pressure relief valve of the pressure reducer should be able to pass 400L/min when the input pressure does not exceed 3MPa.
Airflow;
b) Tested in accordance with 6.15.2. After the pressure relief valve of the pressure reducer is activated, the inhalation resistance and exhalation resistance should not be greater than 2.5kPa.
5.4.6 High-voltage components
Check in accordance with 6.2.Metal high-pressure pipes, valves and connections shall be able to withstand 1.5 times the rated working pressure of gas cylinders.
2 times the rated working pressure of the gas cylinder.
5.4.7 Pressure indicator
Check in accordance with method 6.2 and test in method 6.12.The pressure indicator shall meet the following requirements.
a) The respirator should be equipped with a reliable pressure indicator that can indicate the maximum inflation pressure of the cylinder;
b) The range of the pressure indicator should be at least 5 MPa greater than the maximum inflation pressure of the cylinder; the reading of the pressure indicator should be the same as that of the cylinder valve.
Switch status is irrelevant;
c) The pressure indicator shall be provided with an explosion-proof mechanism to protect the wearer from injury, and the window material shall be made of a transparent material that is not easily broken;
d) When the pressure indicator ruptures, the leakage gas flow under its maximum inflation pressure shall not be greater than 25L/min.
5.4.8 Gas cylinder valve
According to the methods of 6.2 inspection and 6.12 test, the cylinder valve shall meet the following requirements.
a) As a special equipment, the cylinder valve should pass the corresponding type inspection to ensure its safety performance.If necessary, ask the manufacturer for the type
Inspection report;
b) The switch of the gas cylinder valve can be a pin type or a knob type, and its structure design should make the gas cylinder valve easy to open automatically or quickly by hand;
c) The structure of the cylinder valve should be such that the cylinder valve will not be closed unintentionally after opening;
d) The gas cylinder valve shall include gas input and output ports. The gas input port should be internally threaded and the thread size is G5/8, and its tolerance should be
Meet the requirements of Table 1 in GB/T 7307-2001.
5.4.9 Gas cylinder
Inspection according to 6.2, gas cylinders shall meet the following requirements.
a) Steel gas cylinders shall meet the requirements of GB/T 5099-1994;
b) Composite gas cylinders shall meet the requirements of GB/T 28053.
5.4.10 Carrying gear
Check in accordance with Method 6.2 and Test in Method 6.12.The respirator should include a harness or similar parts so that the user can
Put your hands up. The design of the harness should ensure that the user can wear the respirator quickly, simply and correctly without assistance.
5.5 Information to be provided by the manufacturer
Check in accordance with 6.2, each set of respirators should provide instructions for use in Chinese, so that personnel can easily master the use. About product selection, use
The content of use and maintenance shall be consistent with the relevant requirements of GB/T 18664-2002, and shall include at least the following information.
a) should be provided with the smallest sales package;
b) scope of application and restrictions;
c) the correct method of wearing and removing the respirator should be given in the form of pictures and text;
d) Information on proper wearing, use, maintenance, care, charging (if applicable), storage and shelf life, recommended usage temperature and storage temperature
Degree and humidity range;
e) The product should indicate the contact information with the manufacturer or its designated service provider for users to understand the breathing of a certain model in a specific environment.
And other information about the suitability of the device;
f) The user should be informed that the compressed air in the respirator cylinders should comply with GB/T 13277.1;
g) the information should be clear, and help explanations such as commentary, part number and labeling can be added;
h) The warning should give the problems that the product may encounter, such as. use in explosive environments, problems that may occur during wearing, etc .;
i) A description of typical failures, causes, and remedies.
6 Test method
6.1 Test samples and test environmental conditions
6.1.1 Test samples
Unless otherwise required, 2 samples shall be tested, and the temperature and humidity shall be pretreated according to the provisions of 6.3 before testing. Samples should conform to product identification
The description is functional.
6.1.2 Subject requirements
In the low-temperature use performance test and practical performance test, when the subject is involved in the test, the subject should meet GB/T 23465-
According to the requirements of 4.2 in.2009, the routine tests of the subjects' ECG, heart rate, and blood pressure should be qualified.
6.1.3 Test environmental conditions
Unless otherwise specified, the tests shall be performed under the following environmental conditions.
a) Temperature range. 16 ℃ ~ 32 ℃;
b) Humidity range. Relative humidity is 20% ~ 80%.
6.2 apparent inspection
6.2.1 Before the laboratory performance test, an apparent inspection should be performed, including disassembly according to the manufacturer's use and maintenance manual.
6.2.2 Appearance inspections should include information on the identification of the respirator, information provided by the manufacturer,
Evaluation.
6.3 Temperature and humidity pretreatment
Exposing all parts of the sample to the air, follow these steps in order.
a) placed in a dry environment at (70 ± 3) ℃ and relative humidity less than 20% for (72 ± 3) h;
b) placed in a humid environment at (70 ± 3) ℃ and relative humidity 95% ~ 100% for (72 ± 3) h;
c) Store in a low temperature environment at (-30 ± 3) ℃ for (24 ± 1) h.
When the sample is processed by temperature and humidity, the cylinder pressure should not exceed 1/2 of the maximum inflation pressure; before and after each step,
Under thermal shock, the temperature gradient of the temperature and humidity cabinet should not exceed 2 ℃/min.
6.4 Mechanical strength
6.4.1 Test device
The mechanical strength test device is shown in Figure 1. The test device contains a steel container (K) which is fixed vertically on the piston (S)
Each rotary cam (N) is raised by 20mm, and falls on a steel plate (P) with its own weight as the cam rotates. Steel container
The weight should be more than 10kg, and the base of the test equipment should be at least 10 times the weight of the container or be bolted to the ground.
In millimeters
Explanation.
K --- steel container;
N --- cam;
P --- steel plate;
S --- Piston.
Figure 1 Mechanical strength test device
6.4.2 Test method
The test sample is placed in the partition of the steel container (K) to avoid collision with each other during the test.The sample should be kept in the horizontal direction.
(6 ± 2) mm clearance and can move freely in the vertical direction. Rotate for 5min at 100r/min, check and record the respirator
Damage after the test.
6.5 Rated protection time
The rated protection time test is completed by a ventilator. The test conditions are a breathing frequency of 20 times/min and a tidal volume of 1.75L/time.
Fill the cylinder with gas, wear the mask correctly on the test head mold, start the ventilator to start the test and time, when the respiratory resistance does not meet 5.3.3
Stop testing when requested. Record the working time of the respirator, which is the rated protection time.
6.6 Breathing resistance
6.6.1 General
If the environmental conditions are not 23 ° C and 0.1MPa, the flow value should be corrected according to the conditions of 23 ° C and 0.1MPa.
6.6.2 Intake resistance
Wear the mask on a suitable type of test head mold.The breathing interface of the head mold is connected to the ventilator.The mask should be airtight but not deformed.
Zero the force indicator, start the ventilator, adjust the breathing frequency and tidal volume of the ventilator to the specified conditions, test the inhalation stage near the mouth and nose area
Peak static pressure (Pa) of the segment. The suction resistance of the mask in different orientations should be tested. look forward horizontally, look upward vertically, look vertically downward; then
Then the test head mold is placed in a flat state, and the original vertical axis of the test head mold is used as the axis, and the left and right sides are respectively viewed. Recorded maximum test value
As a test result.
6.6.3 Expiratory resistance
Wear the mask on a suitable type of test head mold.The breathing interface of the head mold is connected to the ventilator.The mask should be airtight but not deformed.
Zero the force indicator, start the ventilator, adjust the ventilator's breathing frequency and tidal volume to the specified conditions, and test the breath pattern near the snout area
Peak static pressure (Pa) of the segment. Exhalation resistance of the mask in different orientations should be tested. look forward horizontally, look up vertically, look down vertically; then
Then the test head mold is placed in a flat state, and the original vertical axis of the test head mold is used as the axis, and the left and right sides are respectively viewed. Recorded maximum test value
As a test result.
6.6.4 Low-temperature respiratory resistance
Breathing resistance at low temperature should be tested at (-15 ± 3) ℃ (or the lowest temperature used by the manufacturer)
(20 ± 1) h, then test the respiratory resistance. The cylinder pressure should be charged to the maximum inflation pressure recommended by the manufacturer.The ventilator test conditions are.
The suction frequency is 25 times/min, and the tidal volume is 2L/time.
6.6.5 High-temperature breathing resistance
Respiratory resistance at high temperature should be tested at (60 ± 2) ° C (or the maximum temperature used by the manufacturer)
(20 ± 1) h, then test the respiratory resistance. The cylinder pressure should be charged to the maximum inflation pressure recommended by the manufacturer.The ventilator test conditions are. breathing
The frequency is 25 times/min, and the tidal volume is 2L/time.
6.7 Carbon dioxide content in inhaled gas
6.7.1 Test device
The test device is shown in Figure 2. The test device is mainly composed of a ventilator with a solenoid valve, a connecting pipe, a CO2 flow meter and a CO2 gas analyzer.
composition.
Explanation.
1 --- ventilator;
2 --- auxiliary pump;
3 --- check valve;
4 --- flowmeter;
5 --- compensation bag;
6 --- carbon dioxide gas analyzer;
7 --- Solenoid valve;
8 --- test head mold;
9 --- suction gas sampling tube;
10 --- carbon dioxide absorber;
a --- carbon dioxide gas.
Figure 2 Test device for carbon dioxide content in gas inhaled by mask
The CO2 gas is sent into the ventilator through a flow meter, compensation bag, and check valve. To prevent the accumulation of CO2,
A CO2 absorber should be used in the suction circuit between the machines. At the front of the solenoid valve, a small amount of exhaled gas is continuously extracted through a sampling tube.
The exhaled gas is then returned to the exhaled air stream after passing through the CO2 analyzer.
The auxiliary pump is used to extract 5% of the stroke volume of the ventilator during the inspiratory process at the marked position and send it to the CO2 analyzer. test
The total dead space (excluding ventilator) of the gas path of the testing device shall not exceed.2000 mL.
6.7.2 Test conditions
Ventilator. Breathing frequency 20 times/min, tidal volume 1.75L/time.
6.7.3 Test method
Put the mask on the test head mold correctly. The mask should be airtight and not deformed. When needed, use PVC tape or other suitable sealant
The periphery of the mask is sealed with the test head mold.
Turn on the ventilator, adjust the ventilator to the specified conditions, continuously measure and record the CO2 content in the inhaled gas, and the test proceeds to CO2
When the concentration has stabilized.
Test the CO2 concentration in the environment 1m away from the nose of the test head die. When the CO2 concentration in the inhaled gas has stabilized, at the same time
Measure CO2 concentration in the environment. The CO2 concentration in the environment can also be measured from the sampling tube after the CO2 gas source is turned off. Only when the ring
The test results are considered valid only when the ambient CO2 concentration is below 0.1%.
The test result is the CO2 concentration in the laboratory environment minus the CO2 concentration in the inhaled gas.
The test sample should be tested 3 times, and the average value is the CO2 content in the inhaled gas.
6.8 Leak rate
According to the method of 6.4 in GB 2626-2006, the test medium is oily aerosol.
6.9 Static pressure
The full-face mask is air-tightly worn on the test head mold, and the breathing interface of the test head mold is connected to the ventilator, with the air supply valve completely closed
Open the cylinder valve, start the ventilator to take a few slow breaths, then stop breathing, and record the pressure in the full face mask.
6.10 Air tightness
Close the cylinder valve of the respirator, connect the respirator (excluding the mask) to a device that can generate a positive pressure of 750Pa, and connect it to
Test on a pressure gauge.
Note. In the air-tight test, if necessary, the alarm (if equipped) can be sealed.
6.11 Flammability
6.11.1 Test equipment and conditions
The schematic diagram of the test device is shown in Figure 3. The test device mainly consists of a propane gas cylinder with a flow control valve, a pressure indicator, a tempering eliminator, and a sample
It consists of a product holder, a rotating motor with speed control and a combustion nozzle. The purity of propane should not be less than 95%.
In millimeters
a) Schematic diagram of the mask fixed on the rotating electrical machine b) Schematic diagram of the parts fixed on the rotating electrical machine
Figure 3 Schematic diagram of flame retardancy test device
In millimeters
c) Schematic diagram of the combustion nozzle
Explanation.
1 --- rotating motor (mask);
2--rotary motor (parts);
3--combustion nozzle;
4--thermocouple;
5 --- Thermometer.
Figure 3 (continued)
The flame of the burner is adjustable, so that the flame height is (40 ± 4) mm, and the flame temperature from the top of the burner (20 ± 2) mm is (800 ±
50) ° C, this height point is the test point where the tested sample is in contact with the flame. The flame temperature was measured using a thermocouple with a diameter of about 1.5 mm.
The respirator mask or hood is worn on a metal test head mold with the test head face down; other parts of the respirator need to be fixed in gold
Is on the bracket. The test head mold and metal bracket can be moved horizontally or circularly to make the sample to be tested pass directly above the burner flame and
In contact with the flame, the displacement speed of the test point relative to the flame is (60 ± 6) mm/s. The height of the tested sample holder should be adjustable so that the tested sample
The vertical distance between the test point and the top of the burner is (20 ± 2) mm.
6.11.2 Test method
Wear the respirator mask under test on a metal test head mold, or fix other parts under test on a metal stand, so that the top of the burner and
The vertical distance between the test points of the tested samples is (20 ± 2) mm, and then the test head mold or bracket is located outside the combustion zone of the burner.
After igniting the burner, adjust the flame so that the flame height and the flame temperature at the test site meet the requirements of 6.11.1.
Start the metal test head mold or stand motion control device to make the tested sample pass through the combustion zone. Record the sample being measured as it passes over the flame
Burning of materials. All exposed surfaces of the respirator shall be tested, and each part shall be passed through a flame.
Observe and report the burning phenomenon of the sample.
6.12 Practical performance
6.12.1 Practical performance at room temperature
Test in accordance with the requirements of isolated escape breathing apparatus in GB/T 23465-2009.
6.12.2 Low temperature practical performance
Place the two respirators in standby state at a temperature of (-15 ± 3) ℃ for (4 ± 1) h. Two in warm clothing
The subjects wore air respirators that had been refrigerated in a freezer and worked in an environment with a temperature of (-15 ± 3) ℃. Subject to
The speed of 6km/h walks for 10 minutes without obstacles on flat ground. For respirators with a rated protection time of more than 10 minutes, the test personnel leave
The freezer should then return to normal temperature environment and continue walking at 6km/h for 5min.
After the test, the respirator is checked for failure, and the subject should report breathing comfort and wearing characteristics.
6.13 Combining Strength
Suspend the connecting part and apply the corresponding axial tensile force for 10s. Sample formation should not occur during suspension and tension
Shock.
6.14 Compression Resistance of Respiratory Catheters
6.14.1 Test device
The test setup is shown in Figure 4. Use two rigid discs with a diameter of 100mm and a thickness of 10mm, one of which is fixed and the other
Ability to move in a direction perpendicular to the plane of the disc, and a load can be applied to the specimen between the two discs to bear the total
50N force.
In millimeters
Explanation.
1 --- moving circular plate;
2 --- breathing catheter.
Figure 4 Schematic diagram of the anti-flattening test device of the respiratory catheter
6.14.2 Test method
Place the breathing catheter in the middle between the two discs, let the air flow of 120L/min pass through the breathing hose, apply to the breathing catheter
With a pressure of 50N (including the weight of the disc above), test the air flow again.
If there are multiple breathing tubes at the same time, each breathing tube should be tested at the same time, each breathing tube should be subjected to a load of 50N.
Record the change in air flow after loading.
6.15 Pressure reducing valve
6.15.1 Connect the respirator to the ventilator by appropriate means, and wear the mask on the test head mold. Adjust the ventilator to a breathing rate
25 times/min, tidal volume 2L/time.
6.15.2 Before turning on the ventilator, connect a suitable flow meter to the outlet end of the pressure relief valve, and supply air to the middle pressure section of the pressure reducer.
gas. Increase the supply air pressure gradually until the air flow through the pressure relief valve reaches 400L/min. At this point, start the ventilator,
Measure respiratory resistance at a suitable pressure sampling point.
7 Identification and packaging
7.1 Identification
Each respirator should clearly and securely identify the following information.
a) the words "for escape only";
b) warning signs or Chinese warning instructions;
c) product name and manufacturer logo;
d) product marking;
e) product model;
f) date of manufacture (or number), period of use and certification mark or lot number;
g) Product origin, manufacturer name, full address, zip code and telephone.
7.2 Packaging
7.2.1 Each respirator should have a fixed packing box.The packing box should be clean and dry. It is not allowed to use the respirator which can cause rust or cause harm to the respirator.
Gas material.
7.2.2 The surface of the packaging box shall have the manufacturer's name or trademark, the product name and model, the production date and batch number, and the number of products.
7.2.3 Moisture-proof measures shall be taken in the packing box; the disassembled packing components shall be properly placed in the box, the layout shall be reasonable, and fixed measures shall be taken.
There should be product certificate and product manual in the box.
7.2.4 The full face mask should be packed separately, and the full face lens should take protective measures.
references
[1] EN402..2003 Respiratoryprotectivedevices-Lunggoverneddemandself-containedopen-
circuitcompressedairbreathingapparatuswithfulfacemaskormouthpieceassemblyforescape-
Requirements, testing, marking
[2] EN1146..2005 Respiratoryprotectivedevices-Self-containedopen-circuitcompressedair
breathingapparatusincorporatingahoodforescape-Requirements, testing, marking
Related standard:   GB 38452-2019  GB 38453-2019
Related PDF sample:   GB 5725-2009  GB 811-2010
   
 
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