Powered by Google-Search & Google-Books www.ChineseStandard.net Database: 169759 (Feb 21, 2021)
HOME   Quotation   Tax   Examples Standard-List   Contact-Us   View-Cart
  

GB 25972-2010

Chinese Standard: 'GB 25972-2010'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusRelated Standard
GB 25972-2010English440 Add to Cart 0--10 minutes. Auto immediate delivery. Gas fire extinguishing systems and components Valid GB 25972-2010
GB 25972-2010Chinese49 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]

  In 0~10 minutes time, full copy of this English-PDF will be auto-immediately delivered to your email. See samples for translation quality.  

BASIC DATA
Standard ID GB 25972-2010 (GB25972-2010)
Description (Translated English) Gas fire extinguishing systems and components
Sector / Industry National Standard
Classification of Chinese Standard C84
Classification of International Standard 13.220.10
Word Count Estimation 70,721
Date of Issue 2011-01-10
Date of Implementation 2011-06-01
Quoted Standard GB 150; GB 5099; GB 5100; GB/T 8979; GB/T 9969; GB 18614; GB 20128; GA 61
Drafting Organization Tianjin Fire Research Institute of Ministry of Public Security
Administrative Organization National Fire Protection Standardization Technical Committee Technical Committee fixed fire extinguishing systems
Regulation (derived from) Announcement of Newly Approved National Standards No. 1 of 2011 (No. 166 overall)
Proposing organization People's Republic of China Ministry of Public Security
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This Chinese standard specifies the gas fire extinguishing systems and component parts of the terms and definitions, model preparation methods, requirements, test methods, inspection rules, instructions written request extinguishing agent filling requirements. This standard applies to seven fluorine propane (HFC227ea) fire extinguishing systems, trifluoromethane (HFC23) extinguishing systems, inert gas fire extinguishing system [ including: IG01 (argon) extinguishing systems, IG100 (nitrogen) fire extinguishing systems, IG55 (argon, nitrogen) fire system, IG541 (argon, nitrogen, carbon dioxide) fire extinguishing system ].

GB 25972-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.10
C 84
Gas fire extinguishing systems and components
ISSUED ON. JANUARY 10, 2011
IMPLEMENTED ON. JUNE 01, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Model preparation method... 9 
5 Requirements ... 10 
6 Test methods ... 41 
7 Inspection rules ... 71 
8 Preparation requirements for instruction manual ... 78 
9 Fire extinguishing agent filling ... 78 
Appendix A (Informative) Part number preparation method ... 80 
Appendix B (Informative) Fire extinguishing concentration for category B n-
heptane fire and category A wood pile surface fire ... 82 
Appendix C (Informative) Test method for fire extinguishing concentrations for
putting out category B n-heptane fires and category A wood pile surface fires
... 83 
Appendix D (Normative) System test procedure and sample quantity ... 89 
Appendix E (Normative) Test procedure and sample quantity for fire
extinguishing agent cylinder group ... 90 
Appendix F (Normative) Test procedure and sample quantity for driving gas
cylinder group ... 92 
Appendix G (Normative) Container test procedure and sample quantity ... 93 
Appendix H (Normative) Container valve test procedure and sample quantity
... 94 
Appendix I (Normative) Nozzle test procedure and sample quantity ... 96 
Appendix J (Normative) Selection valve test procedure and sample quantity 98 
Appendix K (Normative) One-way valve test procedure and sample number
... 100 
Appendix L (Normative) Header pipe test procedure and sample quantity .. 102 
Appendix M (Normative) Connection pipe test procedure and sample quantity
... 103 
Appendix N (Normative) Safety venting device test procedure and sample
quantity ... 104 
Appendix P (Normative) Drive device test procedure and sample quantity.. 106 
Appendix Q (Normative) Control panel test procedure and sample quantity 107 
Appendix R (Normative) Weighing device test procedure and sample quantity
... 108 
Appendix S (Normative) Pressure display test procedure and sample quantity
... 109 
Appendix T (Normative) Level measuring device test procedure and sample
quantity ... 111 
Appendix U (Normative) Signal feedback device test procedure and sample
quantity ... 112 
Appendix V (Normative) Pipeline, fitting test procedure and sample quantity
... 114 
Appendix W (Normative) Hook, bracket test procedure and sample quantity
... 115 
Appendix Y (Normative) Decompression device test procedure and sample
quantity ... 116 
Appendix Z (Normative) Low venting high close valve test procedure and
sample quantity ... 117 
Gas fire extinguishing systems and components
1 Scope
This standard specifies the terms and definitions, the method of formulating the
model, the requirements, the test method, the inspection rules, the
requirements for the preparation of the operating instructions, and the fire
extinguishing agent filling requirements of the gas fire extinguishing system and
its components.
This standard applies to heptafluoropropane (HFC227ea) fire extinguishing
system, trifluoromethane (HFC23) fire extinguishing system, inert gas fire
extinguishing system [including. lG01 (argon) fire extinguishing system, lG100
(nitrogen) fire extinguishing system, IG55 (argon, nitrogen) fire extinguishing
system, IG541 (argon, nitrogen, and carbon dioxide) fire extinguishing system.
2 Normative references
The provisions in 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.
GB 150 Steel pressure vessels
GB 5099 Seamless steel gas cylinder (GB 5099-1994, neq ISO 4705.1983)
GB 5100 Welded steel gas cylinders (GB 5100-1994, neq ISO 4706.1989)
GB/T 8979 Pure nitrogen and high purity nitrogen and ultra-pure nitrogen
GB/T 9969 General principles for preparation of instructions for use of
industrial products
GB 18614 Fire extinguishing agent - Heptafluoropropane (HFC227ea)
GB 20128 Inert fire extinguishing agent (GB 20128-2006, ISO 14520.2005,
NEQ)
GA 61 General technical specifications of actuating and control devices of
fixed extinguishing systems
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
System working pressure
Pressure at the outlet of the fire extinguishing agent cylinder group container
valve.
Note. If the container valve on the fire extinguishing agent cylinder group
does not have a decompression function, the working pressure of the system
is the working pressure of the cylinder group.
If the container valve on the fire extinguishing agent cylinder group has a
decompression function, the working pressure of the system is the pressure
at the outlet of the container valve after decompression.
3.2
Filling density
The ratio of the mass of the fire extinguishing agent in the storage container
to the volume of the container, in kilograms per cubic meter (kg/m3).
3.3
Compressed inert gaseous fire extinguishing system
The fire extinguishing system in which the fire extinguishing agent in the
extinguishing agent cylinder group is delivered by its own pressure.
3.4
Stored pressure gaseous fire extinguishing system
The fire extinguishing system in which the fire extinguishing agent is
pressurized and stored in the cylinder group with inert gas, and the fire
extinguishing agent in the cylinder group is delivered by the pressurized gas
in the cylinder group when the system operates.
3.5
Storage pressure
For a compressed inert gaseous fire extinguishing system, it refers to the
equilibrium pressure in an environment of +20 °C of the filled fire
other components.
5.1.2.3 All parts of the same system shall be fixed firmly and connected reliably,
the parts are installed in the correct position, the overall layout is reasonable,
and it is easy to operate, check and maintain.
5.1.2.4 The specifications of the same functional components in the system
shall be the same (except for selection valves and nozzles). The volume, filling
density or filling pressure of each fire extinguishing agent storage container
shall be the same.
5.1.3 Appearance
5.1.3.1 The components of the system shall be free from obvious processing
defects or mechanical damage. The external surfaces of the components shall
be subject to anti-corrosion treatment. The anti-corrosion coating and plating
shall be complete and uniform.
5.1.3.2 The name of the fire extinguishing agent shall be marked on the
extinguishing agent storage container, the handwriting shall be clear and legible.
The name of the filling gas shall be marked on the driving gas storage container.
5.1.3.3 Each manually operated part of the system shall be marked with text
and graphic symbols to indicate the operation method.
5.1.3.4 The system nameplate shall be firmly set on the obvious part of the
system, indicating. system name, model specification, implemented standard
code, fire extinguishing agent filling total mass, working temperature range,
production unit, product number, exit-factory date, etc.
5.1.3.5 The system warning sign shall be firmly set in the obvious part of the
system. The content of the warning sign for the inert gas fire extinguishing
system is that “The nozzle will emit high-pressure gas when the system is in
operation”; for the heptafluoropropane fire extinguishing system and the
trifluoromethane extinguishing system, the content of the warning sign is that
“The system will decompose and produce a certain amount of hydrogen fluoride
gas when it extinguishes fire”. The contents of the warning sign shall be clearly
readable under the general lighting conditions at a distance of 3 m from the sign.
5.1.4 System quasi-working status
The working positions of the operating parts of the system, the control and
monitoring functions of the control panel shall all be in the normal quasi-working
state; the leak detection devices of each cylinder group shall be in normal
working condition, and the filling mass of the medium in the cylinder group
(filling pressure) shall be consistent with the nominal value on the cylinder group.
group shall not be loose, fall off or damaged. After the test, the air tightness of
the fire extinguishing agent cylinder group shall comply with the provisions of
5.2.4, the container valve shall be able to open normally in case of automatic
and manual startup.
5.2.9 Siphon
For fire extinguishing agent cylinder group with siphons, the siphon shall be
made of a metal material that can resist corrosion by the fire extinguishing agent.
5.2.10 Incorrect discharge protection device
The fire extinguishing agent cylinder group shall have a protective device at the
container valve outlet for preventing the accidental discharge of the fire
extinguishing agent during the transportation, loading and unloading, and
storage. The opening on the protective device shall enable the fire extinguishing
agent to be uniformly sprayed without generating excessive recoil force. And
shall not be charged out.
5.2.11 Gas sampling requirements
Fire extinguishing agent cylinder group (on container or container valve) shall
be equipped with fire extinguishing agent sampling port, and the fire
extinguishing agent shall be able to be drawn from the cylinder group without
opening the container valve or fully opening the container valve (it can still be
closed after the sampling of fire extinguishing agent).
5.2.12 Fire extinguishing agent release time
At the maximum filling density or filling pressure of the fire extinguishing agent
cylinder group, the discharge time of the fire extinguishing agent from the
container valve shall be not more than 80% of the system discharge time as
specified in 5.1.1.3.
5.2.13 Fire extinguishing agents and pressurized gas requirements
Heptafluoropropane fire extinguishing agent shall meet the requirements of GB
18614.
The inert gas extinguishing agent shall meet the requirements of GB 20128.
Other fire extinguishing agents shall be products announced by the public
security department of the State Council.
The pressurized gas shall be pure nitrogen and shall meet the requirements of
GB/T 8979.
5.2.14 Signs
5.5.10.1 Salt spray corrosion resistance
The salt spray corrosion test shall be carried out in accordance with the method
specified in 6.9, the container valve and its accessories shall not have obvious
corrosion damage. After the test, the sealing performance of the container valve
shall comply with the provisions of 5.5.5. When the working reliability is tested
in accordance with the provisions of 6.6.1, it shall be able to open accurately
and reliably.
5.5.10.2 Stress corrosion resistance
The stress corrosion test shall be carried out in accordance with the method
specified in 6.11. The container valve and its accessories shall not be cracked
or damaged. The strength of the container valve after the test shall comply with
the provisions of 5.5.4.
5.5.10.3 Sulfur dioxide corrosion resistance
Sulfur dioxide corrosion test shall be carried out in accordance with the method
specified in 6.10. The container valve and its accessories shall not have obvious
corrosion damage. After the test, the container valve sealing performance shall
comply with the provisions of 5.5.5. When the working reliability is tested in
accordance with the provisions of 6.6.1, it shall be able to open accurately and
reliably.
5.5.11 Manual operation requirements
The container valve shall have a mechanical emergency startup function.
Perform an emergency manual startup operation test in accordance with the
method specified in 6.16. The following requirements shall be met.
a) The manual operating force shall not exceed 150 N;
b) The finger pulling operation force shall not exceed 50 N;
c) The finger pushing operation force shall not exceed 10 N;
d) All manual operation displacement shall not exceed 300 mm;
e) The operating torque for rotary opening the container valve shall not
exceed 10 N • m and the rotation angle shall not exceed 27°.
5.5.12 Structural requirements
A one-way needle valve should be installed at the pressure monitor mounting
port for the container valve which is equipped with the pressure display.
5.6 Nozzle
The test pressure is the maximum working pressure of the system and the
pressure holding time is 5 mm.
5.7.6 Working reliability requirements
The working reliability test is carried out in accordance with the method
specified in 6.6.1. The selection valve and its auxiliary control drive shall be
flexible and reliable, and shall not cause any failure or structural damage
(except for parts that are allowed to be damaged during normal operation).
5.7.7 Local resistance loss
The local resistance loss of the selection valve of the heptafluoropropane fire
extinguishing system and the trifluoromethane fire extinguishing system is
expressed by the equivalent length of the connected pipeline. The difference
between the equivalent length of the selection valve measured by the test
method specified in 6.8.1 and the published value in the manufacturer's
instructions shall not exceed 10% of the published value in the operating
instructions.
The local resistance loss of the inert gas fire extinguishing system is
represented by the pressure loss curve. The difference between the pressure
loss curve measured by the test method specified in 6.8.2 and the published
value in the production unit's instruction manual shall not exceed 10% of the
published value in the instruction manual.
5.7.8 Corrosion resistance
5.7.8.1 Salt spray corrosion resistance
The salt spray corrosion test shall be carried out in accordance with the method
specified in 6.9. The selection valve and its accessories shall not have obvious
corrosion damage. After the test, the sealing performance of the selection valve
shall comply with the provisions of 5.7.5. When the working reliability is tested
in accordance with the provisions of 6.6.1, it shall be able to open accurately
and reliably.
5.7.8.2 Stress corrosion resistance
The stress corrosion test is performed in accordance with the method specified
in 6.11. The valve and its accessories shall not be cracked or damaged. The
strength of the selection valve after the test shall comply with the provisions of
5.7.4.
5.7.8.3 Resistance to sulfur dioxide corrosion
The sulfur dioxide corrosion test shall be carried out in accordance with the
method specified in 6.10. The selection valve and its accessories shall not have
group and the pressure holding time is 5 minutes.
The one-way valves have the same forward and reverse strength requirements.
5.8.5 Forward sealing requirements
The airtightness test shall be carried out in accordance with the method
specified in 6.4.3. The one-way valve shall be free from air leakage. The test
pressure is the maximum working pressure of the cylinder group and the
pressure holding time is 5 min.
5.8.6 Backward sealing requirements
The one-way valve used on the flow channel of the fire extinguishing agent shall
be tested for backward airtightness in accordance with the method specified in
6.4.3. The bubble leakage shall not exceed 20 bubbles per minute at the
maximum working pressure of the cylinder group.
The one-way valve which is used along the driving gas control pipeline shall not
produce air bubble leakage under the maximum working pressure.
5.8.7 Working reliability requirements
The working reliability test shall be carried out in accordance with the method
specified in 6.6.2. The one-way valve shall be able to withstand 100 times
“open-close” action tests. The opening and closing actions shall be flexible and
accurate and shall not cause any failure or structural damage.
5.8.8 Opening pressure requirements
The test is carried out in accordance with the method specified in 6.22, the
opening pressure of the one-way valve shall not exceed the published value of
the production unit's instruction manual.
5.8.9 Local resistance loss
The local resistance loss of the one-way valve of the heptafluoropropane fire
extinguishing system and the trifluoromethane fire extinguishing system is
expressed in terms of the equivalent length of the connected pipeline. The
difference between the equivalent length of the one-way valve measured by the
test method specified in 6.8.1 and the published value in the manufacturer's
instruction manual shall not exceed 10% of the published value in the instruction
manual.
The local resistance loss of the one-way valve of the inert gas fire extinguishing
system is represented by the pressure loss curve. The difference between the
pressure loss curve measured by the test method specified in 6.8.2 and the
published value in the manufacturer's instruction manual shall not exceed 10%
The stress corrosion test shall be carried out in accordance with the method
specified in 6.11. The safety venting device shall not be cracked or damaged.
The discharge pressure range of the safety venting device after the test shall
comply with the provisions of 5.11.1.
5.11.2.3 Resistance to sulfur dioxide corrosion
Sulfur dioxide corrosion test shall be carried out in accordance with the method
specified in 6.10. The safety venting device shall not have obvious corrosion
damage. The discharge pressure range of the safety venting device after the
test shall comply with the provisions of 5.11.1.
5.11.3 Temperature cycling resistance
After the temperature cycling test in accordance with the method specified in
6.13, the discharge pressure range of the safety venting device installed on the
cylinder group shall comply with the provisions of 5.11.1.
5.12 Drive device
The performance of the drive system of the system shall comply with the
provisions of GA 61, where the working temperature range shall comply with
the requirements of 5.1.1.1.
5.13 Control panel
5.13.1 Power requirements
The power supply shall meet the following requirements.
a) When the AC supply voltage varies within the range of 187 V ~ 242 V and
the frequency is 50 Hz ± 1 Hz, the control panel shall be able to work
reliably;
b) The standby power supply capacity of the control panel shall be capable
of continuous operation for 24 h under normal monitoring conditions,
during which the system shall be reliably started;
c) Main and standby power supply shall have working instructions.
5.13.2 Alarm function
The control panel shall be able to receive the fire alarm signal from the fire
detector and the fire alarm triggering device, and emit an audible and visual
alarm signal. At rated working voltage, at 1 m away from the control panel, the
sound pressure levels (A weighting) of the internal and external audio
components shall be 65 dB (A) and 85 dB (A) above and 115 dB (A) below,
respectively.
units or trademarks, product name models, product numbers, date of exit-
factory, etc.
5.14 Leak detection device
5.14.1 Weighing device
5.14.1.1 Alarm function
The weighing device installed in the fire extinguishing system shall have an
upper leakage alarm function. When the leakage of the filled media in the
cylinder group reaches 5% of the filling mass, it shall be able to be reliably
alarmed. The light alarm signal shall be yellow, in the general lighting conditions,
it shall be clearly visible from a distance of 3 m; the sound pressure level (A
weighting) of sound alarm signal at rated voltage at a distance of 1 m shall not
be less than 65 dB (A).
5.14.1.2 High and low temperature resistance
After the weighing device is placed in the maximum working temperature and
minimum working temperature environment specified in 5.1.1.1 for 8 h, its alarm
function shall meet the requirements of 5.14.1.1.
5.14.1.3 Overload requirements
The weighing device is subjected to a static load of 2 times the mass of the
cylinder group (calculated in accordance with the maximum filling density of the
medium in the cylinder group) and maintained at 15 min, and shall not be
damaged. The alarm function after the test shall comply with the provisions of
5.14.1.1.
5.14.1.4 Corrosion resistance
5.14.1.4.1 Salt spray corrosion resistance
The salt spray corrosion test shall be carried out in accordance with the method
specified in 6.9. The weighing device shall not have obvious corrosion damage.
The alarm function after the test shall comply with the provisions of 5.14.1.1.
5.14.1.4.2 Resistance to sulfur dioxide corrosion
Sulfur dioxide corrosion test shall be carried out in accordance with the method
specified in 6.10. The weighing device shall not have obvious corrosion damage.
The alarm function after the test shall meet the requirements of 5.14.1.1
5.14.1.5 Signs
The obvious part of the device is marked with. production unit or trademark,
the provisions of 5.14.3.1.
5.14.3.4 Signs
The obvious part of the device shall be marked with. production unit or
trademark, product model specifications, measurement range, etc.
5.15 Signal feedback device
5.15.1 Working pressure
The working pressure of the signal feedback device shall not be less than the
maximum working pressure of the system.
5.15.2 Action pressure
The action pressure setting of the signal feedback device shall not exceed 0.5
times the minimum working pressure of the system. When the signal feedback
device is installed behind the decompression device, its action pressure setting
value shall not exceed 50% of the pressure behind the decompression device.
The action pressure deviation of the signal feedback device shall not exceed
10% of the set value.
The signal feedback device shall have a self-locking function that can only be
manually reset after the action.
5.15.3 Working reliability requirements
It is tested in accordance with the method specified in 6.36, the signal feedback
device shall be operated 100 times reliably under the pressure greater than or
equal to the action pressure without any failure and structural damage. The
contact resistance of the signal feedback device contact after the test shall meet
the requirements of 5.15.9.
5.15.4 Strength requirements
Perform the hydraulic strength test in accordance with the method specified in
6.3. The signal feedback device shall not be damaged.
The test pressure is 1.5 times the maximum working pressure of the system
and the pressure holding time is 5 min.
5.15.5 Sealing requirements
The airtightness test shall be carried out in accordance with the method
specified in 6.4.2. The signal feedback device shall not have air bubble leakage.
The test pressure is the maximum working pressure of the system, and the
pressure is maintained for 5 minutes.
5.16 1 Decompression device
5.16.1 Working pressure
The working pressure of the inert gas extinguishing system decompression
device shall comply with the provisions of 5.1.1.2.
5.16.2 Strength requirements
The hydraulic strength test shall be carried out in accordance with the method
specified in 6.3. The pressure relief device shall not leak, deform or be damaged.
The test pressure is 1.5 times the maximum working pressure of the system
and the pressure holding time is 5 minutes.
5.16.3 Sealing requirements
The airtightness test shall be carried out in accordance with the method
specified in 6.4.5. The pressure relief device shall be free of air bubbles.
The test pressure is the maximum working pressure of the system and the
pressure holding time is 5 min.
5.16.4 Decompression characteristics
In accordance with the test method specified in 6.38, the difference between
the decompression characteristics of the decompression device measured at
the specified flow rate and the published values in the operating instructions of
the production unit shall be no more than 10% of the value declared in the
operating instruction.
5.16.5 Signs
The obvious parts of the decompression device shall be marked with.
production unit or trademark, model specification, medium flow direction, etc.
5.17 Low venting high close valve
5.17.1 Setting requirements
The low venting high close valve shall be installed on the header pipe of the
combined distribution system.
Low venting high close valve shall be installed on the driving gas control
pipeline.
5.17.2 Materials
The low venting high close valve and its internal mechanical parts shall be made
a) Ambient temperature. + 15 °C ~ + 35 °C;
b) Relative humidity. 45 % ~ 75 %;
c) Atmospheric pressure. 86 kPa ~ 106 kPa.
6.2 Appearance, material inspection
6.2.1 With reference to the design drawings and related technical
documentation, visually check or using a general-purpose instrument to check
the sample structure, size, extinguishing agent and pressurized gas, the volume
and diameter of the storage container, and the material of the part to see if they
are in accordance with the provisions of Clause 5.
6.2.2 Use visual inspection to check the contents of component signs, fixing
methods, and cylinder group composition.
6.2.3 Check the consistency of the sample process, visually inspect whether
there are processing defects, surface coating defects, mechanical damage and
other defects, whether it meets the provisions of the corresponding provisions
and design requirements.
6.3 Hydraulic strength test
6.3.1 The hydraulic source for the hydraulic strength test device shall have a
voltage regulator function to eliminate pressure pulses. The accuracy of the
pressure measuring instrument shall not be lower than class 1.6. The rate of
pressure increase of the test device shall be adjustable within the range of
service pressure.
The hydraulic strength test of pressure display can also be performed on a
piston pressure tester.
6.3.2 Connect the inlet of the sample to be tested to the hydraulic strength tester,
remove the air from the connection pipeline and the sample cavity, close all the
outlets of the sample. Slowly pressurize to the test pressure at a rate of no more
than 0.5 MPa/s. Relieve the pressure after holding for 5 min. Examine the
sample and record the test results.
The pressurizing rate of connection pipeline strength test is not less than 0.5
MPa/s.
6.4 Airtightness test
6.4.1 Test requirements
The air pressure sealing test device uses nitrogen or compressed air, the
accuracy of the pressure measuring instrument is not less than level 1.6. The
and the sample cavity, close all the outlets of the sample. The pressure is
gradually increased to the test pressure at a pressure increase rate of not more
than 0.5 MPa/s. After 5 minutes, the pressure is released. The samples are
examined and the test results are recorded.
6.6 Working reliability test
6.6.1 Working reliability test of container valve and selection valve
6.6.1.1 The working reliability test of the container valve and selection valve is
performed on a special test device. Compressed air or nitrogen is used as the
gas source; the volume of the special test container and the working state of
the driver shall meet the requirement that the tested valve is fully opened after
starting, and the outlet of the tested valve shall be connected to the straight
pipe with the same nominal diameter as the outlet and not exceeding 0.5 m in
length, as well as a nozzle with an equivalent bore diameter of not less than 3
mm.
6.6.1.2 Install the tested valve on the special test container, connect the control
drive components, make it work under the specified conditions. Follow the
following procedures.
a) Pressurize the inlet end of the tested valve to the cylinder storage pressure
p, for the gas fire extinguishing system selection valve whose container
valve itself is equipped with the decompression device, the value p is the
pressure at the outlet side of the container valve, the pressure holding
time is not less than 5 s;
b) Start the control drive component to open the tested valve (the drive force
applied by the drive component to the tested valve shall be the drive force
of the drive component at the corresponding temperature);
c) When the pressure in the special test container drops below 0.5 MPa,
close the tested valve;
d) Pressurize the test valve again and continue the next cycle.
Parts that are subject to damage during normal operation of the tested valve
are replaced after each cycle of testing.
6.6.1.3 At room temperature (+20 °C ± 5 °C), the above cyclic test is repeated
100 times. The test device and the sample are transferred into the temperature
test chamber, the test is performed 10 times at the lowest and highest working
temperatures. Before the test, the sample is left in the test environment for a
period of not less than 2 h for the first test. The rest of the test shall allow the
temperature of the sample to fully balance with the temperature in the test
chamber.
suspended in the middle of the working space of the test chamber in
accordance with its normal use position. The temperature of the working space
is controlled at + 35 °C ± 2 °C. Drops of solution from the tested sample cannot
be recycled. Salt mists shall be collected in the working space from at least two
areas to adjust the spray rate during the test and the concentration of the test
salt solution. Collection is made continuously for 16 h from every 80 cm2
collection area, 1.0 mL ~ 2.0 mL of saline solution shall be collected every hour.
The concentration shall be 19% ~ 21% (mass fraction).
The test period is 10 days and ensure continuous spray. After the end of the
test, the sample is rinsed with clean water and allowed to dry naturally for 7
days at a temperature of +20 °C ± 5 °C and a relative humidity of less than 70%.
The corrosion of the sample is checked and recorded.
6.10 Sulfur dioxide corrosion test
The test is conducted in a chemical gas corrosion test device. In the working
chamber, 1% sulfur dioxide gas is added every 24 h in accordance with the
volume fraction. Inject enough distilled water into the bottom flatware at the
bottom of the working chamber to volatilize naturally to form a humid
environment. The temperature in the working chamber is maintained at +45 °C
± 2 °C.
After the sample is removed of oil stain, suspend it in t......
Related standard: GB 25971-2010    GB 19156-2019
Related PDF sample: GB 25204-2010    GB 32157-2015