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GA 578-2005: Super fine powder fire extinguishing agent
GA 578-2005
GA
PUBLIC SECURITY INDUSTRY STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
ICS 13.220.10
C 83
Super fine powder fire extinguishing agent
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ISSUED ON: DECEMBER 8, 2005
IMPLEMENTED ON: MARCH 1, 2006
Issued by: The Ministry of Public Security of the People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Classification ... 5
5 Requirements ... 5
6 Test method ... 5
6.1 Bulk density ... 5
6.2 Moisture content ... 6
6.3 Moisture absorption rate ... 7
6.4 Water repellency ... 9
6.5 Caking resistance (penetration) ... 9
6.6 Low-temperature resistance ... 10
6.7 90% grain diameter ... 11
6.8 Electrical insulation ... 11
6.9 Extinguishing effectiveness to Class B and C fires ... 12
6.10 Extinguishing effectiveness to Class A fires ... 14
7 Inspection rules ... 18
7.1 Inspection classification and items ... 18
7.2 Group and batch ... 19
7.3 Sampling ... 19
7.4 Judgment of test results ... 19
8 Labeling, packaging, transportation, and storage ... 19
8.1 Labeling ... 19
8.2 Packaging ... 20
8.3 Transportation and storage ... 20
Super fine powder fire extinguishing agent
1 Scope
This standard specifies the definition, classification, requirements, test methods,
inspection rules, labeling, packaging, transportation, and storage of super fine powder
fire extinguishing agents.
This standard applies to BC super fine powder fire extinguishing agent and ABC super
fine powder fire extinguishing agent.
2 Normative references
The provisions in the following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this standard, however, parties who
reach an agreement based on this standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies to this standard.
GB/T 3864-1996 Industrial nitrogen
GB 4066(all parts) Powder extinguishing agent
GB 4351 General specifications for portable fire extinguishers (neq ISO 7165:1995)
GB/T 4509-1998 Bitumen - Determination of penetration (eqv ASTM D5-95)
SH 0004-1990 Solvent oil for the rubber industry
3 Terms and definitions
The terms and definitions defined in GB 4066 (all parts) and the followings apply to
this standard.
3.1 90% grain diameter
The mass percentage of particles that is less than or equal to a certain particle size is
90%, then this particle size is called 90% grain diameter.
3.2 super fine powder fire extinguishing agent
a) Balance: the sense quantity shall be 0.2 g;
b) Stoppered measuring cylinder: the measurement range shall be 250 mL, and
the division value shall be 2.5 mL;
c) Stopwatch: the division value shall be 0.1 s.
6.1.2 Test procedure
6.1.2.1 Weigh 35 g of super fine powder fire extinguishing agent sample, accurate to
0.2 g, and place it in a stoppered measuring cylinder.
6.1.2.2 Turn the measuring cylinder upside down for 10 cycles at a rate of 2 s per cycle.
6.1.2.3 After letting the stoppered cylinder stand vertically to the horizontal plane for 3
min, record the volume of the sample.
6.1.3 Test results
The bulk density is calculated according to formula (1), and the average value of the
two test results with a difference not exceeding 0.04 g/mL is taken as the measurement
result:
where:
Db -- bulk density, the unit is gram/milliliter (g/mL);
m0 -- the mass of the super fine powder fire extinguishing agent sample, in grams
(g);
V -- the volume occupied by the super fine powder fire extinguishing agent sample,
in milliliter (mL).
6.2 Moisture content
6.2.1 Instruments
a) Balance: the sense quantity shall be 0.2 mg;
b) Weighing bottle: ??50 mm??30 mm;
c) Desiccator: ??220 mm;
d) Vacuum drying oven: the precision shall be ??2 ??C, ??0.002 MPa.
6.2.2 Test procedure
6.2.2.1 In the weighing bottle with constant weight, weigh 2 g of super fine powder fire
extinguishing agent sample, accurate to 0.2 mg.
6.2.2.2 Place the weighing bottle without the cap in a vacuum drying oven at a
temperature of (50??2) ??C and a vacuum degree of (0.095-0.096) MPa for 1 h.
6.2.2.3 Take out the weighing bottle, put the cap on it and place it in a desiccator, let it
stand for 15 minutes, and then weigh it with an accuracy of 0.2 mg.
6.2.3 Test results
Moisture content x1 is calculated according to formula (2), and the average value of the
two test results with a difference not exceeding 0.02% is taken as the measurement
result:
where:
m1 -- the mass of the super fine powder fire extinguishing agent sample before
drying, in grams (g);
m2 -- the mass of the super fine powder fire extinguishing agent sample after drying,
in grams (g).
6.3 Moisture absorption rate
6.3.1 Reagents, instruments, and equipment
a) Ammonium chloride: chemically pure;
b) Balance: the sense quantity shall be 0.2 mg;
c) Weighing bottle: ??50 mm??30 mm;
d) Desiccator: ??220 mm;
e) Constant temperature and humidity system: a saturated ammonium chloride
constant humidity system (used in arbitration inspection) or temperature and
humidity regulator; see Figure 1 for the saturated ammonium chloride constant
humidity system; the air (humidity is 78%) flowing through the humidistat is
controlled at 5 L/min, and the lower part of the humidistat is filled with
saturated ammonium chloride solution.
moisture absorption, in grams (g).
6.4 Water repellency
6.4.1 Reagents and instruments
a) Sodium chloride: chemically pure;
b) Petri dish: ??70 mm;
c) Pipette: 0.5 mL;
d) Desiccator: ??220 mm.
6.4.2 Test procedure
6.4.2.1 Put an excessive amount of super fine powder fire extinguishing agent sample
in the petri dish, and make the surface flat with a scraper.
6.4.2.2 Use a pipette to drop 0.3 mL of distilled water at three different points on the
surface of the fire extinguishing agent.
6.4.2.3 Place the petri dish in a desiccator with a temperature of (20??5) ??C and filled
with saturated sodium chloride solution (relative humidity 75%) for 1 h.
6.4.2.4 Take out the petri dish and tilt it gradually to make the water droplets roll down.
6.4.3 Test results
Observe the super fine powder fire extinguishing agent sample for obvious water
absorption and caking phenomenon.
6.5 Caking resistance (penetration)
6.5.1 Reagents, instruments, and equipment
a) Ammonium chloride: chemically pure;
b) Constant temperature and humidity system: according to the provisions in e) of
6.3.1;
c) Electrothermal constant temperature drying oven: the precision shall be ??2 ??C;
d) Penetrometer (according to the provisions of GB/T 4509-1998): the precision
shall be 0.1 mm, and the sum of the mass of the standard needle and the needle
shaft shall be (50.00??0.05) g;
e) Beaker: 100 mL;
f) Stopwatch: the division value shall be 0.1 s;
g) Vibration screen machine: the swing frequency shall be (4.58~4.92) Hz, the
vibration frequency shall be (0.52~0.55) Hz, and the vibration height shall be
4.0 mm.
6.5.2 Test procedure
6.5.2.1 In a dry and clean beaker, fill the super fine powder fire extinguishing agent
sample, and make the surface flat with a scraper.
6.5.2.2 Place the beaker on the vibration screen machine, clamp it with a clamp, and
vibrate for 5 minutes; remove the beaker, and humidify it at a temperature of (21??3) ??C
and relative humidity of 78% for 24 hours; then, move it into an electrothermal constant
temperature drying oven at a temperature of (48??2) ??C and dry for 24 hours.
6.5.2.3 Determination of penetration: When measuring, the needle tip shall be close to
the surface of the sample, and the distance between the needle penetration points, and
between the needle penetration points and the cup wall shall not be less than 10 mm.
After the needle freely falls into the sample for 5 seconds, record the depth (in mm) of
the needle inserted into the sample, and measure three needle penetration points for the
sample in each beaker.
6.5.3 Test results
Take the average value of the results of three tests (nine needle penetration points in
total) as the measurement result.
6.6 Low-temperature resistance
6.6.1 Instruments and equipment
a) Low-temperature tester: the precision shall be ??2 ??C;
b) Test tube: ??20 mm??150 mm;
c) Balance: the sense quantity shall be 0.2 g;
d) Stopwatch: the division value shall be 0.1 s.
6.6.2 Test procedure
6.6.2.1 Weigh 8 g of super fine powder fire extinguishing agent sample, accurate to 0.2
g, and place it in a dry and clean test tube.
6.6.2.2 After corking the test tube, put it in the -55 ??? environment for 1 h.
Before the fire extinguishing test, fix the electrodes in the test room at a distance of 50
mm from the bottom and not more than 1 m from the fire model. After spraying, adjust
the transformer to apply a voltage of 4 kV to the electrodes for 5 minutes.
6.8.3 Test results
Apply a voltage of 4 kV and keep for 5 min to record whether there is a breakdown.
6.9 Extinguishing effectiveness to Class B and C fires
6.9.1 Test conditions
6.9.1.1 Fire extinguishing test room
a) The net volume of the test room shall not be less than 100 m3, its length and
width shall not be less than 4 m, and the height H shall be 3.7 m??0.2 m;
b) Before each test, the temperature of each temperature measuring point in the
test room shall be 15 ??C~35 ??C. The fire extinguishing process should be
observed with an infrared camera.
6.9.1.2 Test instruments and materials
a) Oxygen concentration meter: the precision shall be ??0.1%. The instrument
shall be capable of continuously monitoring and recording the oxygen
concentration in the enclosure throughout the test. The height of M1 from the
ground shall be equal to the height of the fire model, and the horizontal
distance from the fire model shall be 600 mm to 1000 mm. M2 shall be located
above M1, perpendicular to M1, with a height of 0.9 H. M3 shall be located
below M1, perpendicular to M1, with a height of 0.1 H (see Figure 2);
b) Temperature measuring device: K-type thermocouple with a diameter of 1 mm.
M4 shall be located 100 mm above the center of the fire model, and M5 shall
be located 50 mm above the four fuel tanks (See Figure 2);
c) Pressure transmitter: the precision shall be 0.5 grade; it shall be able to
continuously monitor and display the outlet pressure of the nozzle;
d) Fuel tray (fire model): a square steel tray with an area of 0.25 m2??0.02 m2, a
height of 120 mm, a wall thickness of 6 mm; 12.5 L of fuel is added to the tray,
and the fuel surface is at least 50 mm away from the upper edge of the tray. The
bottom of the fuel tray shall be 600 mm from the ground, and it can be placed
anywhere in the room where the fire extinguishing agent will not directly spray;
e) Fuel tanks: four steel circular test tanks. The diameter shall be 80 mm??5 mm,
the height shall not be less than 100 mm, and the wall thickness shall not be
c) Pipeline: it shall be made of DN40 seamless steel pipe;
d) Nozzle: The nozzle diameter shall be 10 mm.
6.9.1.4 Installation of fire extinguishing devices
The fire extinguishing agent storage tank and nitrogen cylinder are placed outside the
wall of the test room, and the nozzle is placed in the center of the top of the test room,
300 mm from the top, and sprays downward. The fire extinguishing agent storage tank
and the nozzle are connected by pipelines.
6.9.2 Test procedure
6.9.2.1 Put the super fine powder fire extinguishing agent at -20 ??C??2 ??C for 24 h, then
immediately move it to an environment of 50 ??C??2 ??C for 24 h; then, take it out and
place it at room temperature for at least 2 h.
6.9.2.2 Weigh the super fine powder fire extinguishing agent treated as steps in 6.9.2.1
according to the amount of fire extinguishing agent provided by the manufacturer, and
put it into the fire extinguishing agent storage tank.
6.9.2.3 Fill the fuel tray and fuel tanks with fuel according to regulations, first ignite
the four fuel tanks, then ignite the fuel tray; the pre-combustion shall be 30 seconds.
6.9.2.4 Close the door of the test room (at this time, the oxygen concentration in the
room shall not be lower than the oxygen concentration in the normal atmosphere by
exceeding 0.5%), and start the fire extinguishing device. During the process of spraying,
the pressure regulating valve of the steel cylinder shall be adjusted to keep the outlet
pressure of the nozzle at 0.50 MPa??0.05 MPa. Close the nitrogen cylinder after the
release of the extinguishing agent stops.
6.9.3 Test results
If the flame is completely extinguished within 30 seconds after the release of the fire
extinguishing agent stops, and there is residual fuel in the fuel tray and fuel tanks, then
the test for extinguishing a Class B fire is successful.
NOTE: If the super fine powder fire extinguishing agent has the fire extinguishing effectiveness to class
B fires, it is considered to have the fire extinguishing effectiveness to class C fires.
6.10 Extinguishing effectiveness to Class A fires
6.10.1 Wood crib fire
6.10.1.1 Fire extinguishing test room
It is the same as 6.9.1.1.
combustion. The wood crib is located on the metal support 600 mm above the ground
and can be placed in any place in the room that is not directly sprayed by the fire
extinguishing agent.
6.10.1.5.5 When the pre-combustion reaches 6 minutes, close the door of the room (at
this time, the oxygen concentration in the room shall not be lower than the oxygen
concentration in the normal atmosphere by exceeding 0.5%) and start the fire
extinguishing device. During the process of spraying, the pressure regulating valve of
the steel cylinder shall be adjusted to keep the outlet pressure of the nozzle at 0.50
MPa??0.05 MPa.
6.10.1.5.6 After the release of the fire extinguishing agent stops, close the nitrogen
cylinder, keep the r...