GB 16668-1996 General technical requirements for dry powder fire extinguishing system components
Some standard content:
GB 16668-1996
This standard is formulated in accordance with the requirements of the "Fire Protection Technical Standards Formulation and Revision Project" of the Ministry of Public Security from 1993 to 1994, with reference to relevant domestic and foreign standards.
This standard specifies the performance requirements, test methods and inspection rules for the main components of fixed and semi-fixed dry powder fire extinguishing systems, such as dry powder tanks, bottle head valves, selector valves, gas generators, nozzles, spray guns, etc. The foreign standards referenced by this standard mainly include NFPA17 "Standard For Dry Chemical Extinguishing Systems", Articles 18 and 21 and detailed rules of the Enforcement Rules of the Japanese Fire Protection Law, CNS11176 "Container Valves, Safety Devices and Destruction Plates for Carbon Dioxide, Halon and Dry Powder Fire Extinguishing Equipment", CNS11177 "Rubber Hose Nozzles, Nozzle Switching Valves and Rubber Hose Wheels for Mobile Carbon Dioxide, Halon and Dry Powder Fire Extinguishing Equipment", etc.
This standard is formulated for the first time. The principle of formulation is to combine the actual level of dry powder fire extinguishing system manufacturers in my country with the actual application of fire protection engineering. The technical conditions strive to focus on safety, reliability and actual fire extinguishing applications, leaving as much freedom as possible for the gradual development and improvement of dry powder fire extinguishing systems in the future.
This standard is proposed by the Ministry of Public Security and is under the jurisdiction of the Second Sub-Technical Committee of the National Fire Protection Standardization Technical Committee. The responsible drafting unit of this standard: Tianjin Fire Science Research Institute of the Ministry of Public Security. Participating drafting unit: Baoji Fire Equipment Factory of the Ministry of Public Security. The main drafters of this standard: Dai Dianfeng, Liu Lianxi, Bai Ruizeng, Wang Yurui. 164
1 Scope
National Standard of the People's Republic of China
General technical specifications for components of powder extinguishing systems GB16668-1996
This standard specifies the performance requirements, test methods and inspection rules for components such as dry powder tanks, bottle valves, selector valves, gas generators, nozzles, spray guns, etc. of dry powder fire extinguishing systems.
This standard applies to fixed and semi-fixed dry powder fire extinguishing systems (hereinafter referred to as dry powder systems). 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards. GB150—89 Steel pressure vessels
GB 795—89
Performance requirements and test methods for valves of halogenated fire extinguishing systems GB796-89 Performance requirements and test methods for nozzles of halogenated fire extinguishing systems GB 3323-87
Radiography and quality classification of steel fusion welded butt joints GB 4351--84
GB 4715—-93
GB 4716—93
GB 4717—93
GB 5099--85
GB 5100—85
GB 12241—89
GB 12242—89
GB 12244--89
GB 12245-89
GB13532—93
General technical conditions for portable fire extinguishers
Technical requirements and test methods for point-type smoke detectorsTechnical requirements and test methods for point-type heat detectorsGeneral technical conditions for fire alarm controllers
Seamless steel gas cylinders
Welded steel gas cylinders
Safety valves
Safety valves
Pressure reducing valves
Pressure reducing valves
General requirements
Performance test methods
General requirements
Performance test methods
General technical conditions for dry powder fire extinguishing agents
GN 11—82 Method for compiling fire protection product modelsGA 61-93
3 Definitions
General technical conditions for drive control devices for fixed fire extinguishing systems This standard adopts the following definitions.
3.1 Dry powder system
A fire extinguishing system consisting of a dry powder supply source, a delivery pipeline, a spraying device, a detection and control device, etc. 3.2 Fixed dry powder system
Approved by the State Administration of Technical Supervision on December 18, 1996 and implemented on June 1, 1997
GB 16668-1996
Refers to a dry powder system in which all system components are fixedly installed. 3.3 Semi-fixed dry powder system
Refers to a dry powder system in which the dry powder supply source or the spraying device is movable and the remaining components are fixedly installed. 3.4 Gas cylinder type dry powder system
A dry powder system that sprays the fire extinguishing agent with the help of the pressure of the driving gas stored separately in the gas cylinder. 3.5 Pressure storage type dry powder system
Refers to a dry powder system in which the fire extinguishing agent and the driving gas are stored together in the same container. 3.6 Gas-fired dry powder system
A dry powder system that uses the gas pressure generated by the combustion of solid fuel in the gas generator to drive the fire extinguishing agent. 3.7 Assembly
refers to a partial system with certain functions formed by installing some components of the system together in normal working conditions. 3.8 Maximum working pressure
For a pressure storage type dry powder system, it refers to the internal equilibrium pressure of a storage tank with a rated filling volume when the ambient temperature is equal to the upper limit of the working temperature. For a gas cylinder type system, it refers to the maximum pressure at the outlet of the pressure reducing valve under the permitted working conditions. 4 Classification
4.1 Dry powder systems can be divided into the following according to the storage method of the driving gas: a) gas cylinder type dry powder system;
b) pressure storage type dry powder system;
c) gas-fired dry powder system.
4.2 Dry powder systems can be divided into the following types according to the type of fire extinguishing agent: a) sodium bicarbonate dry powder system;
b) ammonium phosphate dry powder system;
c) amino dry powder system;
d) potassium chloride dry powder system;
e) sodium chloride dry powder system.
4.3 Dry powder systems can be divided into the following types according to the installation method:
a) fixed dry powder system;
b) semi-fixed dry powder system.
5 Specifications and models
5.1 Specifications
The dry powder system is divided into the following specifications according to the mass of dry powder fire extinguishing agent filled in the dry powder tank (unit: kg): 2, 3, 4, 5, 6, 8, 10, 12, 16, 25, 50, 100, 150, 200, 300, 500, 750, 1000, 2000, 3000. 5.2 Model
The model compilation method refers to the provisions of CN11. 166
6 Performance requirements
6.1 Dry powder tank
6.1.1 Appearance quality
GB16668-1996
Type of fire extinguishing agent
(N, L, A, J, N1 represent the five categories a, b, c, d and e in 4.2 respectively)
Main parameters (dry powder filling amount, kg)
-Characteristic code (according to 4.1, categories a, b and c are represented by P, Y and R respectively)
Group (belongs to dry powder fire extinguishing equipment, represented by F)-Class (belongs to automatic fire extinguishing equipment, represented by Z) 6.1.1.1 The outer surface of the dry powder tank should be painted with bright red topcoat with uniform surface color and no obvious defects such as flow marks, cracks, bubbles, scratches, bumps and missing paint.
6.1.1.2 The surface of the electroplated parts should be free of bubbles, obvious scratches, peeling and other defects. 6.1.1.3 The weld of the dry powder tank should be uniform, and the weld should not have visible cracks, burn-through, undercuts and incomplete penetration. The weld flaw detection inspection of the pressure-bearing parts should be carried out in accordance with the provisions of GB3323, and its quality should not be lower than the third-level requirements. 6.1.1.4 The inside of the tank should be clean and free of moisture, grease, iron filings, oxide scale and other debris. 6.1.2 Mechanical strength
6.1.2.1 Wall thickness of dry powder tank
The wall thickness of the dry powder tank with a volume not exceeding 1000L shall be determined according to the wall thickness calculation method specified in Chapter 5 of GB5100-85; the wall thickness of the tank with a volume greater than 1000L shall be determined according to the requirements of GB150. 6.1.2.2 Water pressure strength
The tank body and accessory assembly shall be subjected to water pressure test according to the method specified in 7.1.1.1. The test pressure shall be 1.5 times the maximum working pressure of the dry powder tank. During the test, the tank body shall not have defects such as leakage and macro deformation that affect normal operation. 6.1.2.3 Overpressure requirements
The tank body and its accessory assembly shall be subjected to overpressure test according to the method specified in 7.1.1.2. The test pressure shall be 3 times the maximum working pressure of the dry powder tank. During the test, the dry powder tank and its accessories shall not be broken. 6.1.3 Sealing performance
The tank body and its accessory assembly shall be subjected to overpressure test according to 7.1.2. The sealing performance test shall be carried out according to the method specified in 7.1.3. The test pressure shall be 1.1 times the maximum working pressure of the dry powder tank. There shall be no bubble leakage during the test. 6.1.4 Vibration resistance
The tank body and its accessory assembly shall be subjected to vibration test according to the method specified in 7.1.3. During the test, no cracks, significant deformation or other defects that affect normal operation shall be produced; after the vibration test, the tank body and accessory assembly shall also be subjected to sealing performance test according to the method specified in 7.1.2. The test results shall comply with the provisions of 6.1.3.
6.1.5 Performance requirements for pressure display device
The pressure storage type dry powder system shall be equipped with a pressure gauge or pressure detector that displays the internal pressure of the pressure storage tank; its inlet shall have effective protection measures to prevent powder blockage.
GB16668—1996
Its performance shall comply with the provisions of 3.8 in GB4351. 6.1.6 Performance requirements for safety protection devices
The gas cylinder type dry powder system should be equipped with an overpressure safety protection device: a safety valve or a safety diaphragm, etc. The upper limit of the operating pressure of the safety protection device should not be greater than 1.35 times the maximum working pressure of the system, and the lower limit should not be less than 1.1 times the maximum working pressure of the system.
The rated displacement of the safety protection device should not be less than the rated flow of the pressure reducing valve. According to the test method of 7.1.4, its operating pressure should meet the above requirements and the operating accuracy should be 100%. Other performances should comply with the provisions of GB12241 and GB12242. 6.1.7 Thermal stability of plastic and rubber parts The plastic and rubber parts of the dry powder tank should be made of materials that can be in contact with the dry powder fire extinguishing agent for a long time without corrosion and damage; and the thermal stability test should be carried out according to the method specified in 7.1.5. After the test, no fracture and obvious embrittlement or softening should occur. 6.1.8 Corrosion resistance
The outer surface of the dry powder tank should be resistant to atmospheric corrosion, and its interior should be resistant to dry powder fire extinguishing agent corrosion. 6.1.8.1 The dry powder tank and its accessories should be subjected to external corrosion test according to the method specified in 7.1.6.1. After the test, the coating should not have cracks, peeling and other defects visible to the naked eye, and the operating parts should be able to work normally (if it is a slice, the outer surface coating from the outer edge to the inner 10mm is not evaluated). 6.1.8.2 The dry powder tank and its accessory assembly should be subjected to internal corrosion test according to the method specified in 7.1.6.2. After the test, the internal surface coating should not have defects such as bubbles, cracks, peeling and other defects visible to the naked eye; if there is no coating, the inner surface should not have rust spots visible to the naked eye; the operating parts should be able to work normally.
6.2 Bottle head valve
6.2.1 Strength requirements
The bottle head valve assembly shall be tested according to the method specified in 7.2.1. The test pressure shall be 1.5 times the maximum working pressure of the bottle head valve. During the test, the bottle head valve assembly shall not be deformed or leaking. 6.2.2 Overpressure requirements
Perform an overpressure test according to the method specified in 7.2.2. The test pressure shall be 3 times the maximum working pressure of the bottle head valve. During the test, the bottle head valve assembly shall not rupture.
6.2.3 Sealing performance
Perform a sealing performance test according to the method specified in 7.2.3. The test pressure shall be 1.1 times the maximum working pressure of the bottle head valve. During the test, there shall be no bubble leakage at the outlet of the valve and accessories, and there shall be no mechanical damage. 6.2.4 Corrosion resistance
The bottle head valve assembly shall be subjected to a salt spray corrosion test according to the requirements of 7.2.4. After the test, there shall be no obvious corrosion damage in any part. After the corrosion test, the bottle head valve shall also be tested according to the requirements of 7.2.3 and 7.2.6, and the results shall comply with the provisions of 6.2.3 and 6.2.6. 6.2.5 Vibration resistance
The bottle head valve assembly (including the auxiliary control part) shall be tested according to the method of 7.2.5. During the test, no part of the bottle head valve assembly shall cause structural damage. After the test, it shall be tested again according to the requirements of 7.2.3 and 7.2.6, and the results shall comply with the provisions of 6.2.3 and 6.2.6.
6.2.6 Working reliability requirements
The bottle head valve assembly (including the auxiliary control part) shall be tested according to the method of 7.2.6. During the test, the valve should move flexibly and accurately, and no failure or structural damage shall occur (except for damage to parts of the valve that work normally). 6.2.7 Performance requirements for pressure display devices
The cylinder head valve shall be equipped with a device to display the internal pressure of the gas cylinder, and its performance shall comply with the provisions of 3.8 of GB4351-84. 6.3 Gas cylinders
6.3.1 General requirements
Gas cylinders, including power cylinders, replenishing cylinders, and starter cylinders, shall all be made of seamless steel cylinders, and their performance parameters shall comply with the relevant provisions of GB5099.
6.3.2 Sealing performance
GB 16668-1996
After the gas cylinder and the cylinder head valve are assembled in normal working conditions, a sealing performance test shall be carried out according to the method of 7.3 of this standard. The test pressure shall be 1.1 times the maximum working pressure of the gas cylinder, and there shall be no bubble leakage during the test. 6.4 Selector valve
6.4.1 General requirements
Selector valves are used in combined distribution systems and should be quick-opening valves with both manual and automatic control functions. Check the manual operation according to the method in 7.9.2.1, and the results should meet the following requirements: a) The manual operation force is not greater than 150N,
b) The manual operation stroke is not greater than 300.mm. 6.4.2 Strength requirements
Carry out water pressure test according to the method specified in 7.4.1 of this standard. The test pressure is 1.5 times the maximum working pressure of the dry powder system. The valve and accessories shall not be deformed, leaked, cracked or otherwise damaged. 6.4.3 Overpressure requirements
Carry out the test according to the method specified in 7.4.2. The test pressure is 3 times the maximum working pressure of the dry powder system. The valve shall not rupture. 6.4.4 Sealing performance
Perform a water pressure test according to the method specified in 7.4.3. The test pressure is 1.1 times the maximum working pressure of the dry powder system. The water leakage at the outlet of the valve and its accessories shall not exceed 3.0mL/min. 6.4.5 Working reliability requirements
When the selection valve is tested according to the method specified in 7.4.4, the valve should move flexibly, accurately and reliably, and no failure or structural damage should occur (except for damage to parts of the valve that are working normally). 6.4.6 Valve equivalent length
The equivalent length of the selection valve shall be determined according to the method of 7.4.5, and the test result shall not be greater than 10% of the value specified by the manufacturer. 6.4.7 Corrosion resistance
The inside and outside of the selection valve shall be resistant to the corrosion of dry powder fire extinguishing agent and the external environment respectively. The selection valve shall be subjected to salt spray corrosion test according to 7.4.6 in the open and closed positions. After the test, all parts of the valve shall be flexible to operate and there shall be no obvious corrosion damage. After the salt spray corrosion test, the sealing test and reliability test shall be carried out according to 7.4.3 and 7.4.4, and the requirements of 6.4.4 and 6.4.5 shall be met. 6.5 Gas generator
6.5.1 Strength requirements
The pressure shell of the gas generator shall be subjected to a water pressure test according to the method of 7.5.1. The test pressure shall be 1.5 times its maximum working pressure. During the test, there shall be no defects such as rupture and macro deformation that affect normal use. 6.5.2 Overpressure requirements
The pressure shell of the gas generator shall be subjected to an overpressure strength test according to the method specified in 7.5.2. The test pressure shall be 3 times its maximum working pressure. During the test, the shell shall not rupture. 6.5.3 Corrosion resistance
The pressure shell of the gas generator shall be subjected to a corrosion resistance test according to the method specified in 7.2.4 of this standard. There shall be no obvious corrosion damage after the test, and the corroded pressure shell shall still meet the requirements of 6.5.1 and 6.5.2. 6.5.4 Vibration resistance
The gas generator shall be tested according to the method specified in 7.5.3. During the test, the gas generator shall not have any defects such as cracks and deformation that affect normal operation. The gas generator can still ignite normally after the test. 6.5.5 Moisture resistance
The gas generator as a whole shall be tested according to the method specified in 7.5.4, and the ignition rate of the ignition cartridge shall be 100%. 6.6 Dry powder nozzle
6.6.1 Materials
GB16668-1996
All parts of the nozzle shall be made of corrosion-resistant materials, and the nozzle part must be made of corrosion-resistant metal materials. 6.6.2 Heat and pressure resistance
The nozzle shall be tested according to the method in 7.6.1, and the test pressure shall be its maximum working pressure. After the test, the nozzle shall not have cracks, deformation or other damage. 6.6.3 Heat and cold shock resistance test
After the nozzle is tested according to the method specified in 7.6.2, the nozzle as a whole shall not have any deformation, cracks or other damage. 6.6.4 Impact resistance
The nozzle shall be tested according to the method specified in 7.6.3. After the test, the nozzle as a whole shall not have any cracks, deformation or other damage. 6.6.5 Corrosion resistance
The nozzle shall have a certain corrosion resistance, according to 7.6.After the test specified in 4, the nozzle should not have obvious corrosion damage. Then carry out the powder distribution test according to the method of 7.6.5, and its performance should meet the requirements of 6.6.6. 6.6.6 Powder distribution performance
Carry out the powder distribution test according to the method of 7.6.5, and the nozzle dry powder flow rate and powder spray density distribution curve should be consistent with the values and curves provided by the manufacturer.
6.7 Dry powder spray gun
6.7.1 Materials
Dry powder spray guns should be made of corrosion-resistant or anti-corrosion treated metal materials or other materials with performance not lower than that required by this chapter. 6.7.2 Strength requirements
The combination of dry powder spray gun and spray hose should be subjected to water pressure strength test according to the method of 7.7.1. The test pressure is 1.5 times its maximum working pressure. After the test, the dry powder gun should not have defects such as deformation that affect normal operation. 6.7.3 Overpressure requirements
The dry powder gun and spray hose assembly shall be subjected to an overpressure test according to the method of 7.7.2. The test pressure shall be 3 times its maximum working pressure. After the test, the dry powder gun shall not rupture.
6.7.4 Sealing performance
The dry powder gun shall be subjected to a water pressure sealing test according to the method specified in 7.7.3. The test pressure shall be 1.1 times its maximum working pressure. During the test, there shall be no leakage in the dry powder gun body and various sealing parts. 6.7.5 Corrosion resistance
The dry powder gun shall be subjected to a salt spray corrosion test according to the method of 7.7.4. After the test, there shall be no delamination, peeling or pitting pits visible to the naked eye, and it shall not affect normal operation.
6.7.6 Drop resistance
The dry powder gun shall be tested at a height of 1.5m above the cement floor according to the method specified in 7.7.5. After the test, it shall be able to operate normally. 6.7.7 Spray performance
Measure the effective spray distance of the spray gun, spray powder intensity and other indicators specified by the manufacturer according to the method specified in 7.7.6. The results should be consistent with the regulations of the manufacturer.
6.8 Pressure reducing valve
6.8.1 Corrosion resistance
The pressure reducing valve shall be subjected to salt spray corrosion test according to the method specified in 7.2.4. After the test, the valve body shall not have corrosion damage such as delamination, peeling and visible pitting pits; the pressure reducing valve after the test shall still comply with the provisions of 6.8.2, 6.8.3 and 6.8.4. 6.8.2 Shell strength
The shell of the pressure reducing valve shall be subjected to water pressure strength test according to the method specified in 6.1 of GB12245--89. The test pressure shall be 1.5 times the nominal working pressure of the gas cylinder. During the test, the shell shall not leak. 6.8.3 Flow requirements
The pressure reducing valve shall be tested for flow according to the method specified in 6.3 of GB12245-89; when its inlet pressure is 170
GB 16668-1996
of the nominal working pressure of the gas cylinder, its flow shall be able to meet the filling time of the dry powder tank not more than the following provisions: a) 30s (rated filling volume of the dry powder tank ≤ 1000kg) b) 45s (rated filling volume of the dry powder tank> 1000kg) 6.8.4 Other performances shall comply with the provisions of GB12244 and GB12245. 6.9 Alarm and control components
6.9.1 Driver requirements
6.9.1.1 The driving force of the solenoid valve driver shall not be less than twice the operating force required for the valve to operate at the maximum load. 6.9.1.2 The driving force of the pneumatic driver shall not be less than twice the operating force required for the valve to operate at the maximum load. 6.9.1.3 The minimum driving force of other types of actuators under the permitted use conditions shall not be less than twice the driving force required for the valve under the maximum load.
Other performances of alarm and control components shall comply with the provisions of GB4715, GB4716, GB4717 and GA61. 6.10 System requirements
6.10.1 Appearance quality
6.10.1.1 The paint film of painted parts shall be uniform in color and free of obvious flow marks, bubbles, bumps and other defects. 6.10.1.2 The surface of electroplated parts shall be free of obvious bubbles, magnetic damage, plating leakage and other defects. 6.10.1.3 Signs and decals shall be straight, flat and not fall off due to external corrosion. 6.10.2 Structural requirements
6.10.2.1 The device shall be equipped with three starting modes: automatic, manual and mechanical emergency operation. a) Automatic operation: The operation of the system does not require any human action. b) Manual operation: The operation of the system shall be able to complete the entire system operation in one action. c) Mechanical emergency operating mechanism:
The measurement should be carried out according to the method of 7.9.2.1, and the measurement results should meet the following requirements: The operating force of the emergency operating mechanism should not be greater than 150N; The operating stroke should not be greater than 300mm; The emergency operating mechanism should have a safety device, and its release force should not be greater than 100N. 6.10.2.2 A dust cap should be added to the nozzle end of the pipeline to prevent moisture and dust from entering the pipeline and tank and causing corrosion. Once the system is started, the dust cap should be easily blown off.
6.10.3 Nameplate requirements for dry powder fire extinguishing system
The dry powder system must be equipped with a nameplate at a prominent position at the control end. The nameplate should indicate the system name, model specifications, rated working pressure (under 20℃), working temperature range, factory date and other precautions. 6.10.4 Other requirements
6.10.4.1 The fire extinguishing agent used in the system should comply with GB13532 and relevant standards. The type of fire extinguishing agent used in the dry powder system shall not be changed at will. If there is any change, it must be approved by the quality supervision and inspection department. 6.10.4.2 System operating temperature range: The operating temperature limit of the dry powder system is generally -20℃~~50℃. When the design operating temperature range is determined separately according to actual needs, it must be inspected and approved by the quality supervision and inspection department. 6.10.5 System action requirements
Carry out linkage test according to the method specified in 7.8.3. There should be no visible leakage at the system components and interfaces, and the action should be accurate and flexible. The filling time, effective spraying time, spraying distance, dry powder remaining rate, and dry powder distribution of the dry powder tank should all meet the requirements of relevant standards. 7 Test method
The water temperature of the test water should not be lower than 5℃.
The pressure gauge accuracy should not be lower than Class 1.5.
7.1 Dry powder tank
7.1.1 Strength test
GB16668-1996
Before the test, the fire extinguishing agent in the dry powder tank should be cleaned up, and the internal inspection should be carried out after flushing with water. The results should comply with the provisions of 6.1.1.4. Then assemble the tank body and accessories according to the working state requirements and prepare for the following tests. 7.1.1.1 Water pressure test
Fix the dry powder tank and accessory assembly on the test bench and connect it to the water pressure supply device, seal the powder outlet; an exhaust port can be reserved. Start the pressurizing device and slowly pressurize to exhaust the gas in the tank. After the gas is exhausted, seal the reserved exhaust port, and then slowly pressurize to the pressure value specified in 6.1.2.2, maintain the pressure for 1 minute, and the result should comply with the provisions of 6.1.2.2. 7.1.1.2 Overpressure test
The test steps are the same as 7.1.1.1, but the test bench is required to have safety protection measures. The test pressure shall be in accordance with the provisions of 6.1.2.3. The pressure shall be maintained for 1 minute at the specified pressure. The test results shall comply with the provisions of 6.1.2.3. 7.1.2 Sealing test
Assemble the tank body and its accessories according to the working state, close the external interface of the powder outlet pipe, connect the air inlet to the air pressure supply device, immerse the tank body in a pool filled with clean water, and the top immersion depth should not be less than 20cm. Then slowly pressurize the dry powder tank to the test pressure. Maintain the pressure for 2 minutes. The test results shall comply with the provisions of 6.1.3. 7.1.3 Vibration test
Fasten the dry powder tank and its accessories assembly in the clamping device of the vibration table in an upright state and start the vibration table. During the test, the vibration direction should be changed in turn according to the directions of the three vertical coordinate axes of X, Y, and Z for testing. Requirements: displacement amplitude: 0.8mm;
frequency: 20Hz;
vibration time: 2h (in each direction);
test results shall comply with the provisions of 6.1.4.
7.1.4 Safety protection device test
7.1.4.1 Determination of safety valve opening pressure
The safety valve and accessory assembly are adjusted and installed on the test bench. The inlet is connected to the air pressure supply device. A pressure gauge is installed on the pipeline to display the pressure at the safety valve inlet. Slowly increase the pressure until the safety valve operates and record this pressure; the safety valve opening pressure measurement shall be repeated three times, with an interval of not less than 3 minutes each time. The test results shall comply with the provisions of 6.1.6.
7.1.4.2 Determination of the bursting pressure of the safety diaphragm The safety diaphragm together with the entire safety device is slowly pressurized by the air pressure supply device until it bursts, and the bursting pressure is recorded. This test shall be repeated 10 times.
The test results shall comply with the provisions of 6.1.6.
7.1.5 Thermal stability test of plastic and rubber parts Take out all plastic and rubber parts of the dry powder tank and place them in a temperature box at 60℃±3℃. Keep them in this environment for 500 hours, then take them out and put them in an environment at 20℃±5℃ for 5 hours, then take them out and check them carefully. The test results should comply with the provisions of 6.1.7.
7.1.6 Corrosion test
7.1.6.1 External corrosion test
The party submitting the test should provide a test piece with an area of not less than 360cm (if it is a welded seam, it should include a weld with a length of not less than 15cm). The material and treatment method should be the same as the tank body; put the test piece (small tanks can directly use the tank body) and the exposed accessories on the tank body into the salt spray corrosion test box; test according to the method of 7.2.4, and the test cycle is 240 hours. The test results should comply with the provisions of 6.1.8.1.
7.1.6.2 Internal corrosion test
Seal the powder outlet of the dry powder tank assembly, load the corresponding type of dry powder fire extinguishing agent, place it in the specified maximum operating temperature environment for 21 days (temperature deviation is -5°C), take it out and store it indoors for 70 days. After the test expires, remove the fire extinguishing agent first, clean the internal surface of the dry powder tank 172
assembly with warm water, and carefully check the corrosion. The test results should comply with the provisions of 6.1.8.2.
7.2 Bottle head valve
7.2.1 Strength test
GB 16668—1996
Connect the inlet of the tested bottle head valve to the hydraulic supply device, seal all outlets (including the outlet of the pressure relief device), but reserve an outlet in advance to discharge the gas in the valve, open the hydraulic device valve, slowly pressurize, and seal the reserved outlet after the air in the valve is exhausted. Slowly increase the pressure to the pressure specified in 6.2.1 and maintain the pressure for 5 minutes. The test results shall comply with the provisions of 6.2.1.
7.2.2 Overpressure test
The test steps are the same as those in 7.2.1, and the test pressure shall comply with the provisions of 6.2.2. Maintain the pressure for 5 minutes. The test results shall comply with the provisions of 6.2.2. bzxZ.net
7.2.3 Sealing test
Connect the inlet of the closed bottle head valve to the air supply device and block all outlets upstream of the valve seat; immerse the entire bottle head valve in water (the top of the valve is immersed in the water surface for no less than 20cm), gradually increase the pressure to the test pressure specified in 6.2.3, maintain the pressure for 3 minutes, observe whether there are bubbles at the valve outlet, then remove the valve from the water and open the valve without releasing the pressure. The test results shall comply with the provisions of 6.2.3.
7.2.4 Salt spray corrosion test
The salt spray corrosion test shall be conducted in a salt spray corrosion test chamber, with the chamber temperature of 35℃±2℃ and the spray rate of 1～2mL/h (the average spray rate measured after a collector with an effective area of 80cm2 is placed in the test chamber for 24 hours). The test solution is made of white sodium chloride dissolved in distilled water, with a concentration of 50g/L±5g/L and a pH value of 6.5～7.2 at 25℃. The residual liquid after spraying cannot be reused.
After cleaning and decontamination, the test piece is hung on a special bracket in the test chamber. Only one test piece is tested each time, and the test cycle is 240h. The spraying cannot be stopped during the test cycle. The test chamber is allowed to be opened for a short time only when inspection or other necessary operations are carried out, but the surface of the test piece shall not be touched; after the test, it shall be dried for 0.5～1h, then cleaned in clean water at 40℃, and finally dried in air. 7.2.5 Vibration test
Assemble the cylinder head valve and gas cylinder (the smallest gas cylinder allowed by the design of the cylinder head valve can be selected) in working state, pressurize to the working pressure at 20℃, and fix it together with the control part in working state on the vibration table. Test according to the method of 7.1.3, and the result should meet the requirements of 6.2.5. 7.2.6 Working reliability test
Connect the inlet of the cylinder head valve assembly (including the control device) to the air pressure supply device, and complete the following cycle test at a temperature of 20℃±5℃.
Test sequence:
a) Open the pressure gas source valve, pressurize to the working pressure of the cylinder head valve, and maintain the pressure for no less than 5s; b) Start the cylinder head valve in normal working mode; c) Close the gas valve after starting, and the cylinder head valve returns to normal (parts damaged during normal working should be replaced in time); d) Close the cylinder head valve and pressurize again.
The above cycle test should be repeated 100 times, and 10 times at the highest and lowest operating temperatures respectively. The test results shall comply with the provisions of 6.2.6.
7.3 Sealing test of gas cylinders and components
Assemble the gas cylinder and the cylinder head valve (including accessories) in normal working state, and connect the cylinder head valve inlet to the nitrogen pressure supply system; during the test, first slowly pressurize to the pressure specified in 6.3.2, remove the air pressure supply device, and close the cylinder head valve, immerse the gas cylinder together with the cylinder head valve and accessories in water for 3 minutes (the immersion depth of the top of the assembly is not less than 20cm). The test results shall comply with the provisions of 6.3.2.
7.4 Selector valve
7.4.1 Strength test
GB16668-1996
Open the selector valve, connect the valve inlet to the water pressure supply device, block the valve outlet (one outlet can be reserved to exhaust the gas in the valve, and the exhaust port can be sealed after the gas is exhausted), slowly pressurize to the pressure specified in 6.4.2, and maintain the pressure for 5 minutes. The test results shall comply with the provisions of 6.4.2.
7.4.2 Overpressure test
The test steps are the same as 7.4.1, the test pressure is in accordance with 6.4.3, and the pressure is maintained for 5 minutes. The test results shall comply with the provisions of 6.4.3.
7.4.3 Sealing test
Close the selector valve, connect its inlet to the hydraulic supply device, block the valve outlet, gradually increase the pressure to the value specified in 6.4.4, maintain the pressure for 3 minutes, observe whether there is leakage, and measure the water seepage. The test results shall comply with the provisions of 6.4.4.
7.4.4 Working reliability test
Assemble the selector valve and other auxiliary control equipment according to the working state, drive the selector valve according to the drive type of the selector valve, and the test sequence and number are the same as 7.2.6.
The test results shall comply with the provisions of 6.4.5.
7.4.5 Determination of equivalent length
The test shall be carried out in accordance with the method for determining the equivalent length of container valves in GB795. The test results shall comply with the provisions of 6.4.6.
7.4.6 Salt spray corrosion test
The test shall be carried out in accordance with the method specified in 7.2.4 of this standard. The test results shall comply with the provisions of 6.4.7.
7.5 Gas generator
7.5.1 Shell water pressure test
The shell of the gas generator is fixed on the test bench for water pressure strength test. During the test, the shell is first filled with clean water, the inlet is connected to the water pressure supply device, and the pressure is slowly increased to the test pressure specified in 6.5.1, and the pressure is maintained for 3 minutes. The test results shall comply with the provisions of 6.5.1.
7.5.2 Shell overpressure test
The test steps are the same as 7.5.1, and the test pressure shall be in accordance with the provisions of 6.5.2. The test results shall comply with the provisions of 6.5.2.
7.5.3 Vibration test
Fix the gas generator in the clamping device of the vibration table, start the vibration table, and conduct the vibration test according to the method specified in 7.3.1. The test results should comply with the provisions of 6.5.4.
7.5.4 Moisture resistance test
Take a cup (which should be able to hold the ignition cartridge) and inject 5-40℃ clean water, immerse the ignition cartridge completely in the cup of water, let it stand for 24 hours, then take it out and immediately conduct an ignition test, the test should be no less than 10 times. The test results should comply with the provisions of 6.5.5.
7.6 Nozzle
7.6.1 Heat and pressure resistance test
Install the nozzle on the pipe in the high temperature test chamber, and connect the nozzle to the standard dry powder tank at room temperature through the pipe. The standard tank is an ellipsoid tank with 10kg of fire extinguishing agent and a filling ratio of 0.65kg/L. The tank should be equipped with an air supply system to ensure that the pressure at the nozzle meets the requirements of 6.6.2.
The temperature in the high temperature test chamber is 400℃±10℃. The nozzle is kept at this temperature for 5 minutes, and then the valve is opened until the dry powder is sprayed out. 174
The test results should meet the requirements of 6.6.2.
7.6.2 Heat and cold shock resistance test
GB 16668-1996
First, install the nozzle in the high temperature chamber and connect it to the standard dry powder tank at room temperature through a pipeline. The temperature of the high temperature chamber is controlled at 400℃±10℃. After 5 minutes, quickly move the nozzle into the low temperature chamber with a temperature equal to the lower limit of the system operating temperature, and immediately open the valve until the dry powder is sprayed out.
7.6.3 Impact resistance test
The test shall be conducted according to the method specified in 5.5 of GB796-89. The test results shall comply with the provisions of 6.6.4. 7.6.4 Corrosion resistance test
Carry out salt spray corrosion test according to the method of 7.2.4 of this standard, and the test results shall comply with the provisions of 6.6.5. 7.6.5 Powder distribution test
The test site is a square with a side length not less than 4 times the protection radius of the nozzle to be tested. The nozzle position can be arranged according to the nozzle type, and the nozzle height can be adjusted; square powder collection boxes are densely distributed in the test area, and the area of each powder collection box is not more than 0.5m×0.5m. During the test, the nozzle is installed according to the construction requirements and connected to the standard dry powder storage tank through a pipeline; the pressure and air replenishment speed of the standard dry powder tank should enable the nozzle to spray the fire extinguishing agent according to the working pressure. The dry powder spraying time and the remaining amount of dry powder should be recorded during the test. After the powder spraying is completed, the powder collection amount and the total powder spraying amount of each powder collection box are measured, the average powder distribution density at each powder collection box is calculated, and the powder spraying density curve is drawn. Compare with the curve provided by the manufacturer; and calculate the nozzle flow rate according to the formula: Nozzle flow rate = powder mass - powder remaining amount spray time
The result should comply with the provisions of 6.6.6.
7.7 Dry powder gun
7.7.1 Strength test
Assemble the dry powder gun and the connecting hose according to the working state, fix the dry powder gun on the test bench, and connect the inlet end of the hose to the water pressure supply device; turn on the dry powder gun switch, slowly pressurize to exhaust the air in the spray gun, turn off the spray gun switch, continue to pressurize to the test pressure specified in 6.7.2, and maintain the pressure for 5 minutes.
The test result should comply with the provisions of 6.7.2.
7.7.2 Overpressure test
Test according to the steps of 7.7.1, and the test pressure is in accordance with the provisions of 6.7.3. The test result should comply with the provisions of 6.7.3.
7.7.3 Sealing test
Connect the inlet of the dry powder gun and hose assembly to the water pressure supply device; first turn on the dry powder gun switch, slowly increase the pressure, and turn off the switch after the gas in the gun body is exhausted. Continue to increase the pressure to the pressure specified in 6.7.4 and maintain the pressure for 2 minutes. The test results should comply with the provisions of 6.7.4.
7.7.4 Corrosion test
Carry out the salt spray corrosion test in accordance with the provisions of 7.2.4, and the test results should comply with the provisions of 6.7.5. 7.7.5 Drop test
The dry powder gun is freely dropped from a height of 1.5m±0.05m above the ground (starting from the lowest point of the spray gun) to the cement floor from three positions: the nozzle facing up, the nozzle facing down, and the axis of the spray gun is in a horizontal state (if there is a switch, the switch should be below the horizontal axis). The spray gun is checked after falling twice at each position, and the results should comply with the provisions of 6.7.6. 7.7.6 Spray test
Fix the dry powder gun on the bracket, the axis of the gun body should be parallel to the ground, and the center of the nozzle should be 1.2m ± 0.05m from the ground; the inlet of the dry powder gun is connected to the standard dry powder tank specified in 7.6.1, and pressurized according to the working pressure of the dry powder gun. Within the range of 60% to 150% of the range, place a square powder receiving plate with a side length of 300mm and a height of 30mm every 0.5m, 175
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.