GB 4066-2017_English: PDF (GB4066-2017)
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Powder extinguishing agent
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GB 4066-2017
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| GB 4066.1-2004 | English | 90 |
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Fire extinguishing media -- Part 1: BC powder
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GB 4066.1-2004
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| GB 4066-1994 | English | 439 |
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Fire extinguishing agent-Sodium bicarbonate dry chemical
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GB 4066-1994
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Fire extinguishing agent--Sodium bicarbonate dry chemical
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GB 4066-1983
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| Standard ID | GB 4066-2017 (GB4066-2017) | | Description (Translated English) | Powder extinguishing agent | | Sector / Industry | National Standard | | Classification of Chinese Standard | C83 | | Classification of International Standard | 13.220.10 | | Word Count Estimation | 26,248 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | Drafting Organization | Ministry of Public Security Tianjin Fire Research Institute | | Administrative Organization | Ministry of Public Security of the People's Republic of China | | Proposing organization | Ministry of Public Security of the People's Republic of China | | Issuing agency(ies) | People's Republic of China General Administration of Quality Supervision, Inspection and Quarantine, China National Standardization Administration | | Standard ID | GB 4066.1-2004 (GB4066.1-2004) | | Description (Translated English) | Fire extinguishing media. Part1: BC powder | | Sector / Industry | National Standard | | Classification of Chinese Standard | C84 | | Classification of International Standard | 13.220.30 | | Word Count Estimation | 14,164 | | Date of Issue | 2004-08-05 | | Date of Implementation | 2005-02-01 | | Older Standard (superseded by this standard) | GB 4066-1994 | | Quoted Standard | GB/T 622-1989; GB 4351 | | Adopted Standard | ISO 7202-1987, NEQ | | Drafting Organization | Tianjin Fire Research Institute of Ministry of Public Security | | Administrative Organization | Third National Fire Protection Standardization Technical Committee Technical Committee | | Regulation (derived from) | Announcement of Newly Approved National Standards 2004 No. 8 (No. 70 overall) | | Proposing organization | Ministry of Public Security of the People Republic of China | | Issuing agency(ies) | State Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China China National Standardization Administration Committee | | Summary | This Chinese standard specifies the definition of BC powder extinguishing agent, requirements, test methods, inspection rules, marking, packaging, transport and storage, etc. This standard applies capable of extinguishing Class B and Class C fires dry powder extinguishing agent. | | Standard ID | GB 4066-1994 (GB4066-1994) | | Description (Translated English) | Fire extinguishing agent-Sodium bicarbonate dry chemical | | Sector / Industry | National Standard | | Classification of Chinese Standard | C84 | | Classification of International Standard | 13.220.30 | | Word Count Estimation | 11,125 | | Date of Issue | 1994/5/5 | | Date of Implementation | 1995/2/1 | | Older Standard (superseded by this standard) | GB 4066-1983 | | Adopted Standard | ISO 7202-1987, NEQ | | Regulation (derived from) | Announcement of Newly Approved National Standards 2004 No. 8 (No. 70 overall) | | Proposing organization | Ministry of Public Security of the People Republic of China | | Issuing agency(ies) | State Bureau of Technical Supervision | | Summary | This Standard specifies the technical requirements of sodium bicarbonate powder extinguishing agent, test methods, inspection rules, marking, packaging, transport and storage and so on. This Standard is applicable to sodium bicarbonate powder extinguishing agent-based material. |
GB 4066-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.10
C 83
Replacing GB 4066.1-2004, GB 4066.2-2004
Powder extinguishing agent
干粉灭火剂
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Models ... 6
5 Technical requirements ... 7
6 Test methods ... 7
7 Inspection rules ... 18
8 Marks, packaging, instruction manual, transportation and storage ... 19
Annex A (Normative) Test method for sodium bicarbonate content ... 20
Annex B (Normative) Test method for ammonium dihydrogen phosphate content ... 24
Annex C (Normative) Test method for class A fire extinguishing performance ... 27
Annex D (Normative) Test method for class B, C fire extinguishing performance ... 31
Powder extinguishing agent
1 Scope
This Standard specifies the terms and definitions, models, technical requirements, test
methods, inspection rules, marks, packaging, transportation and storage for powder
extinguishing agent.
This Standard applies to powder extinguishing agent whose major chemical content is
not less than 75%. It is not suitable for ultra-fine powder extinguishing agent specified
in GA 578 and Class D powder extinguishing agent specified in GA 979.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 535, Fertilizer grade ammonium sulphate
GB/T 622, Chemical reagent - Hydrochloric acid
GB 4351.1, Portable fire extinguishers - Part 1: Performance and construction
GB/T 4509, Standard test method for penetration of bitumen
GB/T 4968, Classification of fires
GB/T 5907 (all parts), Fire protection vocabulary
GB/T 6003.1, Test sieves - Technical requirements and testing - Part 1: Test sieves
of metal wire cloth
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 9969, General principles for preparation of instructions for use of industrial
products
GA 578, Super fine powder fire extinguishing agent
GA 634, Adiabatic protective clothing for firefighter
GA 979, Fire extinguishing media. D power
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 5907 and
GB/T 4968 as well as the followings apply.
3.1 characterization statement
The data and information on the physical or chemical properties of powder
extinguishing agent provided by the manufacturer or the inspection entrusting party. It
includes the content of chemical content, bulk density, particle size distribution, fire
extinguishing performance, etc.
3.2 chemical content
The basic component of powder extinguishing agent. Additives used to improve
extinguishing agent storage, moisture resistance, fluidity, etc. are not included.
3.3 major chemical content
Among the chemical contents of powder extinguishing agent, the chemical content with
the highest content.
3.4 batch
Uniformed products that are produced according to the same formula and the same
process, one-time feeding and production.
3.5 lot
Multiple batches of products under the same formula, process, and raw materials. The
total amount shall not exceed 25 t.
NOTE: Any major changes in production personnel, manufacturing process, raw materials or
environmental conditions are considered as different lots.
4 Models
The model of powder extinguishing agent is represented by a combination of fire type
codes applicable to firefighting, chemical content and amount, and enterprise-defined
information. The total content of chemical contents shall not be less than 90%.
b) Weighing bottle: ϕ70 mm × 40 mm;
c) Desiccator: ϕ220 mm;
d) Balance: accuracy is 0.2 mg.
6.3.2 Test steps
6.3.2.1 In the weighing bottle with constant weight, weigh 5 g of powder extinguishing
agent specimen, accurate to 0.2 mg.
6.3.2.2 Place the weighing bottle without the cap in the desiccator filled with sulfuric
acid at a temperature of 20°C±2°C for 48 h.
6.3.2.3 Take out the weighing bottle and put it in the desiccator. Weigh after standing
for 15 min, accurate to 0.2 mg.
6.3.3 Results
Moisture content x1 is calculated according to formula (2):
Where,
m1 - the mass of the specimen before drying, in grams (g);
m2 - the mass of the specimen after drying, in grams (g).
Take the average of the two test results with a difference of not more than 0.02% as the
measurement result.
6.4 Moisture absorption rate
6.4.1 Reagents, instruments and equipment
The requirements for reagents, instruments, and equipment for the moisture absorption
rate test are as follows:
a) Ammonium chloride: chemically pure;
b) Balance: accuracy is 0.2 mg;
c) Weighing bottle: ϕ50 mm × 30 mm;
d) Desiccator: ϕ220 mm;
e) Constant temperature and humidity system: saturated ammonium chloride
6 - base.
Figure 2 -- Liquidity tester
6.5.2 Test steps
6.5.2.1 Weigh 300 g of powder extinguishing agent specimen, accurate to 0.5 g. Put it
into the glass sand clock.
6.5.2.2 Mount the glass sand clock on the stand. Turn the specimen continuously in the
sand clock for 30 s. After inflating the specimen, immediately start measuring the time
for 20 consecutive free passages through the middle of the neck.
6.5.3 Results
Take the arithmetic mean value of 20 test times as the measurement result.
6.6 Water repellency
6.6.1 Reagents and instruments
The requirements for the reagents and instruments for water repellency test are as
follows:
a) Sodium chloride: chemically pure;
b) Petri dish: ϕ70 mm;
c) Pipette: 0.5 mL;
d) Desiccator: ϕ220 mm.
6.6.2 Test steps
6.6.2.1 Put an excess powder extinguishing agent specimen in the petri dish. Use a
spatula to smooth the surface.
6.6.2.2 Use a pipette to drop 0.3 mL of grade three water at three different points on the
surface of the dry powder (according to the provisions of GB/T 6682). The distance
between the dripping points and between the dripping points and the edge of the petri
dish shall not be less than 10 mm.
6.6.2.3 Place the petri dish in a desiccator filled with saturated sodium chloride solution
at a temperature of (20±5)°C (relative humidity is 75%). The time for placement is
(120±5) min.
6.6.2.4 Remove the Petri dish. Gradually tilt to make the drops roll off.
6.6.3 Results
Observe whether the specimen has obvious water absorption and agglomeration.
6.7 Penetration
6.7.1 Reagents, instruments and equipment
The requirements for the reagents, instruments, and equipment for the penetration test
are as follows:
a) Ammonium chloride: chemically pure;
b) Saturated ammonium chloride constant humidity system or constant temperature
and humidity box: The saturated ammonium chloride constant humidity system
(see Figure 1) controls the air flow rate of 5 L/min (humidity is 78%) to pass
through the humidistat. The lower part of the humidistat is filled with saturated
ammonium chloride solution;
c) Penetration meter: in accordance with GB/T 4509; precision is 0.1 mm; the sum
of the mass of the standard needle and the needle strip is (50.00±0.05) g;
d) Electrothermal constant temperature drying oven: accuracy is ±2°C;
e) Beaker: capacity is 100 mL;
f) Stopwatch: graduation value is 0.1 s;
g) Vibrating screen machine: swing frequency is 4.58 Hz ~ 4.92 Hz; shock frequency
is 0.52 Hz ~ 0.55 Hz; shock height is 4.0 mm.
6.7.2 Test steps
6.7.2.1 In a dry and clean beaker, fill the powder extinguishing agent specimen. Use a
spatula to smooth the surface.
6.7.2.2 Place the beaker on the shaker. Use a clamp to clamp. Shake for 5 min. Remove
the beaker. Humidify in a humidistat with a temperature of (21±3)°C and a relative
humidity of 78% for 24 h. Then move it into an electric constant temperature drying
oven with a temperature of (48±3)°C and dry for 24 h.
6.7.2.3 Determination of penetration: When measuring, the tip of the needle shall be
close to the surface of the specimen. The distance between the needle penetration points
and between the needle penetration point and the beaker wall shall not be less than 10
mm. After the needle falls freely into the specimen for 5s, record the depth of the needle
inserted into the specimen. Measure three needle penetration points for each beaker
specimen.
6.7.3 Results
Take the average value of 9 test results whose deviation from the average value does
6.9.1 Instruments and equipment
The requirements for the instruments and equipment for the low temperature resistance
test are as follows:
a) Low temperature tester: accuracy is ±1°C;
b) Test tube: ϕ20 mm × 150 mm;
c) Balance: resolution is 0.2 g;
d) Stopwatch: division value is 0.1 s.
6.9.2 Test steps
6.9.2.1 Weigh 20 g of powder extinguishing agent specimen, accurate to 0.2 g. Place in
a dry, clean test tube.
6.9.2.2 Put the test tube in a -55°C environment for 1 h after stoppering.
6.9.2.3 Remove the test tube. Tilt it upside down within 2 s. Use the stopwatch to record
the time for the specimen to flow completely.
6.9.3 Results
Take the average value of 3 test results as the measurement result.
6.10 Electrical insulation
6.10.1 Instruments and equipment
The requirements for the instruments and equipment for electrical insulation testing are
as follows:
a) Test cup (see Figure 3): The cup body is made of high insulating material that does
not absorb moisture. The distance between any part of the electrode and the test
cup is not less than 13 mm. The distance between the top of the test cup and the
top of the electrode is not less than 32 mm.
b) Plate electrodes are polished brass plates. The diameter is 25 mm. The thickness
is not less than 3 mm. The edges are at right angles. The electrode spacing is (2.50
± 0.01) mm.
c) Pressure resistance tester: the output voltage can be continuously raised to above
5 kV.
d) Drop test bench: the maximum drop height is 30 mm. The maximum allowable
load is 50 kg. It is continuously adjustable in the frequency range of 0 Hz ~ 1.667
Hz. The falling acceleration is greater than 9.3 m/s2.
Put the powder extinguishing agent specimen in a colorless glass. Observe the color.
6.12 Fire extinguishing performance
The extinguishing performance of powder extinguishing agent for class A fire shall be
inspected according to the provisions of Annex C. The extinguishing performance of
powder extinguishing agent for classes B, C fire shall be inspected according to the
provisions of Annex D.
7 Inspection rules
7.1 Inspection categories and items
7.1.1 Routine inspection
In normal production, each batch of products shall be routinely inspected. Bulk density,
fluidity, water repellency, particle size distribution, low temperature resistance, and
color are routine inspection items.
7.1.2 Confirmation inspection
All inspection items in Table 1 are confirmation inspection items. Each lot of products
shall be sampled for inspection of the content of chemical content, moisture content,
moisture absorption rate, and penetration. The rest of the items shall also be inspected
regularly to ensure that the products continue to meet the requirements of this Standard.
7.1.3 Type inspection
All the inspection items in Table 1 are type inspection items. In one of the following
situations, type inspection shall be carried out:
a) When a new product is identified, or an old product is transferred to a factory for
production;
b) After formal production, when the raw materials and process have changed greatly;
c) When the production has been suspended for more than one year, production is
resumed;
d) When the national quality supervision agency proposes type inspection
requirements according to law.
7.2 Sampling method
7.2.1 Samples for type inspection and confirmation inspection shall be taken from
products that pass routine inspection. The sampling method shall ensure that the
sampling is representative. The samples shall be thoroughly mixed before testing.
Annex A
(Normative)
Test method for sodium bicarbonate content
A.1 Titration method (arbitration method)
A.1.1 Method principle
After destroying the silicon film of the powder extinguishing agent specimen, heat
distilled water to dissolve and filter. Take its filtrate. Use cresyl red-thymol blue and
bromocresol green-methyl red as indication solutions respectively. Use standard
hydrochloric acid solution to titrate.
A.1.2 Reagents
Test reagents:
a) Acetone: analytically pure;
b) Grade three water: comply with the provisions of GB/T 6682;
c) Bromocresol green ethanol solution (0.1%);
d) Methyl red ethanol solution (0.2%);
e) Bromocresol green-methyl red mixed indicator: Mix bromocresol green ethanol
solution (0.1%) with methyl red ethanol solution (0.2%) at a volume ratio of 3:1.
Shake well;
f) Cresyl red sodium salt solution (0.1%);
g) Thymol blue sodium salt solution (0.1%);
h) Cresyl red-thymol blue mixed indicator: Mix cresyl red sodium salt solution
(0.1%) with thymol blue sodium salt solution (0.1%) at a volume ratio of 1:3.
Shake well;
i) Hydrochloric acid standard titration solution: Use hydrochloric acid (in
accordance with the provisions of GB/T 622) to prepare an aqueous solution of
which the concentration is about 0.1 mol/L.
A.1.3 Instruments
Test instruments:
a) Balance: resolution is 0.2 mg;
b) Volumetric flask: 500 mL;
c) Pipette: 50 mL;
d) Burette: 50 mL;
e) Erlenmeyer flask: 250 mL.
A.1.4 Test steps
A.1.4.1 Prepare the solution to be tested as follows:
a) Weigh 2 g of powder extinguishing agent specimen, accurate to 0.0002 g. Put in
a 100 mL beaker. Add 3 mL ~ 4 mL of acetone and keep stirring.
b) After the acetone volatilizes, add a small amount of hot tertiary water at 60℃ ~
70℃ to dissolve and filter. Use about 250 mL of grade three water to wash the
insoluble matters. Collect the filtrate and detergent in a 500 mL volumetric flask.
Use grade three water to dilute to 500 mL. Shake well and it shall be solution A
to be tested.
A.1.4.2 Use a pipette to draw 50 mL of solution A. Transfer to a 250 mL Erlenmeyer
flask. Add 5 drops of cresyl red-thymol blue mixed indicator. Use hydrochloric acid
standard solution to titrate until the color of the test solution changes from purple to
yellow. Read the volume V1 of the consumed hydrochloric acid standard solution.
A.1.4.3 Add 10 drops of bromocresol green-methyl red mixed indicator. Use
hydrochloric acid standard solution to titrate until the color of the test solution changes
from green to dark red.
A.1.4.4 Boil for 2 min. The color of the solution changes back to green. Cool to room
temperature. Use hydrochloric acid standard solution to continue titrating till dark red
as the end point. Read the volume V2 of the consumed hydrochloric acid standard
solution.
A.1.5 Results
The sodium bicarbonate content x1 in the specimen is calculated according to formula
(A.1):
Where,
m0 - the specimen mass, in grams (g);
Annex B
(Normative)
Test method for ammonium dihydrogen phosphate content
B.1 Method principle
The orthophosphate ion in the ammonium dihydrogen phosphate solution reacts with
the quinolybdocitone reagent in an acidic medium to form a yellow quinoline
phosphomolybdate precipitate. After filtering, washing and drying, weigh the weight of
the obtained precipitate and perform the nitrogen content inspection according to GB/T
535 for correction.
B.2 Reagents
Test reagents:
a) Sodium molybdate: analytically pure;
b) Citric acid: analytically pure;
c) Nitric acid: analytically pure;
d) Grade three water: comply with the provisions of GB/T 6682;
e) Quinoline: no reducing agent;
f) Acetone: analytically pure;
g) Nitric acid solution: 1+1 solution;
h) Preparation of quincimolicone reagent:
1) Prepare solution a: Put 70 g of sodium molybdate in a 400 mL beaker. Add 100
mL of grade three water to dissolve;
2) Preparation solution b: Place 60 g of citric acid in a 1000 mL beaker. After
adding 100 mL of grade three water to dissolve, add 85 mL of nitric acid;
3) Prepare solution c: Add solution a to solution b. Mix well;
4) Prepare solution d: In a 400 mL beaker, mix 35 mL of nitric acid with 100 mL
of grade three water. Then add 5 mL of quinoline;
5) Add solution d to solution c. Mix well. Stand overnight. Use filter paper or
cotton to filter. Add 280 mL of acetone to the filtrate. Use grade three water to
......
GB 4066.1-2004
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.30
C 84
Replacing GB 4066-1994
Fire extinguishing media - Part 1. BC powder
(ISO 7202.1987, Fire protection - Fire extinguishing media - Powder, NEQ)
ISSUED ON. AUGUST 5, 2004
IMPLEMENTED ON. FEBRUARY 1, 2005
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Requirements ... 6
5 Test methods ... 6
6 Inspection rules ... 17
7 Marks, packaging, user manual, transport and storage ... 18
Annex A (Normative) Test method for sodium bicarbonate content ... 20
Annex B (Informative) Mobility test method ... 24
Foreword
Clause 4, Clause 6 of this Part are mandatory; the rest are recommendatory.
GB 4066 Fire extinguishing media consists of two parts.
- Part 1. BC powder;
- Part 2. ABC powder.
This Part is the first part of GB 4066.
This Part is not equivalent to ISO 7202.1987 "Fire protection - Fire
extinguishing media - Powder". The main differences are as follows.
- added requirements for moisture content, moisture absorption, color;
- modified test method for fire-extinguishing performance;
- added Annex A “Test method for sodium bicarbonate content”;
- provided Annex B “Liquidity test method”.
This Part replaces GB 4066-1994 Fire extinguishing agent-Sodium
bicarbonate dry chemical. Compared with GB 4066-1994, the main changes
in this Part are as follows.
- added requirements for moisture content, color;
- modified requirements for content, particle size distribution;
- modified test methods for water repellency, hygroscopicity, and fire
resistance;
- added a normative annex “Test method for sodium bicarbonate content”
(see Annex A);
- added an informative annex “Liquidity test method” (see Annex B).
Since the implementation of this Part, GB 13532-1992 General specifications
for powder extinguishing agent and GB 4066-1994 Fire extinguishing
agent-Sodium bicarbonate dry chemical are repealed simultaneously.
Annex A of this Part is normative. Annex B is informative.
This Part was proposed by Ministry of Public Security of the People 's
Republic of China.
Fire extinguishing media - Part 1. BC powder
1 Scope
This Part of GB 4066 specifies the definition, requirements, test methods,
inspection rules, marks, packaging, transport and storage of BC Fire
extinguishing media - Powder.
This Part is applicable to dry powder fire extinguishing medias capable of
extinguishing Class B and Class C fires.
2 Normative references
The following standards contain the provisions which, through reference in
this Part of GB 4066, constitute the provisions of this Part. For dated
references, subsequent amendments (excluding corrections) or revisions do
not apply to this Part. However, the parties who enter into agreement based
on this Part are encouraged to investigate whether the latest versions of
these documents are applicable. For undated reference documents, the latest
versions apply to this Part.
GB 622-1989, Chemical reagent - Hydrochloric acid (eqv ISO
6353/2.1983)
GB 4351, Portable fire extinguishers
GB/T 4509-1998, Bitumen--Determination of penetration
GB/T 6003.1-1997, Test sieves of metal wire cloth (eqv ISO 3310-1.1990)
GB/T 6682-1992, Water for laboratory use; Specifications (neq ISO
3696.1987)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 BC Fire extinguishing media - Powder
Fire extinguishing agent capable of extinguishing Class B and Class C fires
c) Penetration instrument (in line with the provisions of GB/T 4509-1998).
accuracy of 0.1 mm; the sum of the standard needle and the needle bar
mass is (50.00 ± 0.05) g;
d) Electric thermostat oven. accuracy ±2°C;
e) Beaker. 100 mL;
f) Stopwatch. division value of 0.1 s;
g) Seismic screening machine. swing frequency of (4.58 ~ 4.92) Hz, shock
frequency of (0.52 ~ 0.55) Hz, shock height of 4.0 mm.
5.5.2 Test steps
5.5.2.1 In a dry, clean beaker, fill the dry powder fire extinguishing media
sample and scrape the surface with a scraper.
5.5.2.2 Place the beaker on the shock sieve. Clamp with clamps. Shake for
5 min. Remove the beaker. Humidify for 24 h at a temperature of (21 ± 3)°C
and a relative humidity of 78%. And then transfer it into an (48 ± 3)°C electric
heating oven for drying 24 h.
5.5.2.3 Determination of penetration. during the determination, the tip is
close to the specimen surface; the distance between the needle points, the
distance between the needle point and the cup wall shall not be less than 10
mm. Within 5 s after the needle is free to fall into the sample, record the depth
of the needle inserted into the sample (in mm). Test three needle points for
each beaker sample.
5.5.3 Results
Take the average of the nine test results as determination results.
5.6 Water repellency
5.6.1 Reagents, apparatus
a) Sodium chloride. chemically pure;
b) Petri dish. Φ70 mm;
c) Pipette. 0.5 mL;
d) Dryer. Φ220 mm.
5.6.2 Test steps
5.6.2.1 Add excess dry powder fire extinguishing media sample to the petri
where,
m5 - mass of dry powder fire extinguishing media in each layer of sieve and
chassis, in grams (g);
m6 - mass of dry powder fire extinguishing media, in grams (g).
Take the average of two test results with the recovery rate greater than 98%
as determination results.
5.8 Low temperature resistance
a) Low temperature tester. accuracy of ±1°C;
b) Test tube. Φ20 mm × 150 mm;
c) Balance. resolution of 0.2 g;
d) Stopwatch. division value of 0.1 s.
5.8.2 Test steps
5.8.2.1 Weigh 20 g of dry powder fire extinguishing media sample, to
nearest of 0.2 g. Place in a dry, clean test tube.
5.8.2.2 Plug the test tube and place into a 55°C environment for 1 h.
5.8.2.3 Remove the tube so that it tilts within 2 s until it is upside down. Use
stopwatch to record the time at which all the samples have flowed.
5.8.3 Results
Take the average of three test results as determination results.
5.9 Electrical insulation
5.9.1 Apparatus, equipment
a) Test cup (see Figure 2). the cup is made of a non-hygroscopic high
insulating material. The distance between any part of the electrode and the
test cup is not less than 13 mm. The distance between the top of the test
cup and the top of the electrode is not less than 32 mm. The plate
electrode is polished brass plate of which the diameter is 25 mm, the
thickness is not less than 3 mm, the edge is at right angle, the electrode
spacing is (2.50 ± 0.01) mm.
b) Boost transformer. the output voltage can be continuously risen to 5 kV
or more.
c) Electric blast drying oven. accuracy of ±2°C;
d) Platform scale. accuracy of 0.05 kg;
e) Stopwatch. division value of 0.1 s.
5.11.2.2 Test steps
5.11.2.2.1 Load 8 kg of dry powder fire extinguishing media sample into the
dry power fire extinguisher. Charge the pressure to working pressure.
5.11.2.2.2 Fix the dry powder fire extinguisher on the vibration table. Vibrate
for 30 min at an amplitude of 1.27 mm and a frequency of 34 Hz.
5.11.2.2.3 Place the dry powder fire extinguisher in a (54 ± 3)°C dryer for 24
h.
5.11.2.2.4 Remove the dry powder fire extinguisher. Place it still to room
temperature. Inject till the pressure disappears.
5.11.2.2.5 Weigh the mass of dry powder fire extinguishing media remaining
in the dry powder fire extinguisher.
5.11.2.3 Results
Calculate according to the provisions of 5.11.1.3.
5.12 Class B, C fires extinguishing performance
5.12.1 Materials, apparatus, equipment
a) Fuel. No. 90 unleaded petrol for automobile;
b) Anemometer;
c) 3 kg special dry powder fire extinguisher. the initial pressure is (1.4 ± 0.1)
MPa; the nozzle diameter is Φ4 mm; the nozzle diameter is Φ10 mm; the
nozzle length is 320 mm; the cylinder diameter is Φ127.4; the cylinder
volume is 3.8 L; the siphon inner diameter is Φ12 mm; the siphon distance
from the bottom of the tube is (13 ~ 16) mm; the material and strength, etc.
comply with the provisions of GB 4351;
d) Stopwatch. divisions value is 0.1 s;
e) Steel pan. diameter is (1750 ± 20) mm; height is (200 ± 15) mm; the wall
thickness is 2.5 mm.
5.12.2 Test steps
Annex A
(Normative)
Test method for sodium bicarbonate content
A.1 Titration method (arbitration method)
A.1.1 Principle of method
After the dry powder fire extinguishing media sample damages the silicon film,
heat the distilled water, dissolve and filter. Take the filtrate. Respectively take
cresol red thymol blue and bromocresol green methyl red as indicator solution.
Use hydrochloric acid standard solution for titration.
A.1.2 Reagents
A.1.2.1 Acetone. analytically pure
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