GB 21976.7-2012 PDF in English
GB 21976.7-2012 (GB21976.7-2012) PDF English
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Escape apparatus for building fire -- Part 7: Filtering respiratory protective devices for self-rescue from fire
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Standards related to (historical): GB 21976.7-2012
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GB 21976.7-2012: PDF in English GB 21976.7-2012
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.10
C 85
Escape apparatus for building fire - Part 7: Filtering
respiratory protective devices for self-rescue from fire
建筑火灾逃生避难器材
ISSUED ON: NOVEMBER 05, 2012
IMPLEMENTED ON: JUNE 01, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Type, model ... 5
5 Technical requirements ... 6
6 Test methods ... 8
7 Inspection rules ... 16
8 Marking, packaging, transportation, storage ... 18
Escape apparatus for building fire - Part 7: Filtering
respiratory protective devices for self-rescue from fire
1 Scope
This part of GB 21976 specifies the type, model, technical requirements, test
methods, inspection rules, marking, packaging, transportation, storage, other
requirements of the filtering respiratory protective devices for self-rescue from
fire.
This part applies to the disposable filtering respiratory protective devices for
self-rescue from fire worn by personnel when they are in a place where the
oxygen concentration in the air is not less than 17% in the event of a fire.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB 2626-2006 Respiratory protective equipment - non-powered air-purifying
particle respirator
GB 2890-2009 Respiratory protection - Non-powered air-purifying
respirators
GB 14866-2006 The specifications for personal eye-protectors
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Filtering respiratory protective devices for self-rescue from fire
A respirator for removing harmful gases such as carbon monoxide and
smoke by adsorption, absorption, catalysis and direct filtration of a filtering
device, for a person to escape in the event of a fire.
5.3 Materials
5.3.1 Surface quality of metal materials
All metal parts of the respirator shall be subjected to corrosion-resistance
treatment. The surface shall be free from such defects as cracks, wrinkles, burrs.
5.3.2 Aging-resistance of rubber-plastic materials
The rubber-plastic materials used in the respirator shall, after being subjected
to high-temperature and low-temperature test, not show obvious deformation,
damage, adhesion, cracking, hardening, other abnormal phenomena.
5.3.3 Flame-retardancy of materials
After the flame-retardancy test, all materials that may come into contact with
the flame shall not continue to burn, melt, etc.; and shall not cause additional
injury to the human body.
5.3.4 Strength of packaging materials
The respirator shall be sealed and packaged. The packaging material shall
have sufficient fastness. After the anti-drop, anti-perforation, anti-tear
performance tests, there shall be no damage.
5.4 Resistance to mechanical impact and environmental change
The respirator shall have sufficient stability for the specified mechanical load,
ambient temperature and humidity changes. It shall not have damages such as
cracks, explosions, crushing, etc., which may cause failure. Meanwhile it shall
comply with the requirements of 5.5 ~ 5.8.
5.5 Protective performance
5.5.1 Protective performance for carbon monoxide
During the rated protective time, in any single 5 min process, the time-weighted
average of the carbon monoxide’s penetrating concentration shall not exceed
200 mL/m3, the inhalation temperature shall not exceed 65 °C, the inhalation
resistance shall not exceed 800 Pa, the exhalation resistance shall not exceed
300 Pa.
5.5.2 Smoke-filtering performance
The smoke-filtering efficiency shall not be less than 95%.
5.6 Protective hood
5.6.1 Air-leakage coefficient
6.2 Determination of wearing mass
Use the electronic scale which has a range of 0 g ~ 3000 g and an accuracy of
grade-III to measure the wearing mass of the respirator.
6.3 Material test
6.3.1 Surface quality of metal materials
Use visual inspection to determine it.
6.3.2 Aging performance test of rubber-plastic materials
After the following tests, the rubber and plastic materials are determined by
visual inspection:
a) Place it in a 70 °C ± 3 °C environment for 72 h;
b) Place it in a -30 °C ± 3 °C environment for 24 h.
6.3.3 Flame-retardancy test of materials
It is carried out according to the provisions of 6.15.2 and 6.15.3 of GB 2626-
2006.
6.3.4 Strength test of packaging materials
6.3.4.1 Anti-drop performance test
Allow the packed respirators (storage-type respirators are not tested) to drop
from a height of 1.5 m to a flat concrete floor for 6 times at different azimuth
angles.
6.3.4.2 Anti-perforation and anti-tear performance test of packaging
materials
The test device is as shown in Figure 1. The effective mass when the mounting
arm and the striker are horizontally and freely released is 100 g. Place a single
packaged respirator on the test device, so that the striker can be released to hit
the respirator. Adjust the distance between the tip of the striker to the surface
of the package to 100 mm. Release the striker. Keep the striker in contact with
the surface of the package. Along the direction as shown by the arrow in Figure
1, gently and quickly pull out the respirator. Repeat the above process twice
more, to make the striker hit different parts of the package surface.
b) Carry out airtightness test for the test device: under the pressure of 1.96
kPa, hold it for 1 min, the pressure drop of the test device shall not exceed
29 Pa;
c) Calibrate the respiratory rate and respiratory volume of the respirator;
d) Check the water volume in the constant-temperature humidification tank;
e) Calibrate the flowrate of test gas;
f) Place the test respirator in an environment of 20 °C ± 5 °C for more than 2
h.
6.5.1.4 Test procedures
The test is carried out as follows:
a) Connect the respirator's filter device and half mask (for respirator with
exhalation valve, it shall include exhalation valve) to the test port in the
test chamber;
b) When the concentration of carbon monoxide in the test chamber rises to
the value as specified in the test conditions, immediately turn on the
respirator and start timekeeping. Continuously test the concentration of
the filtered carbon monoxide.
6.5.1.5 Record
The record shall include the following:
a) The concentration of carbon monoxide in the test gas;
b) The concentration of carbon monoxide in the filtered gas;
c) The temperature of the gas entering the test chamber;
d) The humidity of the gas entering the test chamber;
e) Exhalation humidity;
f) Inhalation temperature;
g) Exhalation resistance;
h) Inhalation resistance.
6.5.2 Test of smoke-filter performance
The test of smoke-filtering performance is carried out according to the
1 - Respirator; 2 - Sampling pump; 3 - Check valve; 4 - Flowmeter; 5 - Buffering airbags;
6 - Gas analyzer of carbon dioxide; 7 - Check valve; 8 - Test head mold; 9 - Sampling
tube of inhaled carbon dioxide; 10 - Carbon dioxide absorber.
Figure 3 -- Schematic diagram of the test device for carbon dioxide
content in the inhaled gas
6.6.3.3 Test preparation
The test preparation is carried out as follows:
a) Use standard gas to calibrate the gas analyzer of carbon monoxide;
b) Carry out airtightness test for the test device: under the pressure of 1.96
kPa, hold it for 1 min, the pressure drop of the test device shall not exceed
29 Pa;
c) Calibrate the respiratory rate and respiratory volume of the respirator;
d) Place the test respirator in an environment of 20 °C ± 5 °C for more than
2 h.
6.6.3.4 Test procedure
The test is carried out as follows:
a) Wear the respirator on the standard head mold, so that the half mask is in
close contact with the head mold. If necessary, it may use sealant;
b) Adjust the carbon dioxide content in the exhaled gas to the specified value.
Turn on the ventilator. Continuously carry out test and record it. Stop the
test until the carbon dioxide content in the inhaled gas reaches a stable
state. At the steady state, the concentration of carbon dioxide is the carbon
dioxide content in the inhaled gas.
6.6.4 Test of light transmittance
The test of light transmittance is carried out in accordance with the provisions
of 6.1.3 of GB 14866-2006.
6.7 Test of mechanical structural integrity of respirator at high
concentration of carbon monoxide
The test conditions, test equipment, test preparation, test procedures are the
same as 6.5.1.1 ~ 6.5.1.4. After the test is completed, take apart the filter device
for inspection.
6.8 Test of connection strength
Resistance to mechanical collision and environmental changes,
mechanical structural integrity of respirator at high concentrations of
carbon monoxide
Personnel wearing suitability 5
7.2.3 When all the type inspection items comply with the requirements of this
part, it is qualified.
8 Marking, packaging, transportation, storage
8.1 Marking
8.1.1 At an eye-catching part of a single respirator, it shall be indicated of the
following:
a) There shall be the words “This product is for one-time escape from fire
only and cannot be used for work protection”;
b) Manufacturer's name and registered trademark;
c) Product name and model number;
d) The product’s use instructions or a brief diagram of use method;
e) Environmental requirements in the standby state of product;
f) The warnings for the storage-type respirator that it shall not be arbitrarily
moved, knocked, disassembled, etc.;
g) Date of manufacture and batch number;
h) Standard number implemented;
i) Expiration date of product.
8.1.2 The surface of the package shall have the following contents:
a) Name of the manufacturer;
b) Product name and model number;
c) Date of manufacture and batch number;
d) Quantity;
e) Words or symbols such as “Avoid humidity”, “Avoid heat”, “Handle with
care”, etc.;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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