Some standard content:
National Standard of the People's Republic of China
Portable dry powder fire extinguishers (stored-pressure)
Subject content and scope of application
GB 1251590
This standard specifies the types, specifications, basic parameters, technical requirements and test methods of portable dry powder fire extinguishers. This standard applies to portable dry powder fire extinguishers (hereinafter referred to as fire extinguishers). 2 Reference standards
Ordinary thread tolerances and fits (diameter 1~～355mm) GB1804
Tolerances and fits Limit deviations of dimensions without tolerances GB2828
GB 2829
GB3323
GB3864
GB4066
GB4351
Count sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)Count sampling procedure and sampling table for periodic inspection (applicable to inspection of stability of production process)Radiograph and quality classification of steel fusion welded butt jointsGaseous nitrogen for industrial use
Sodium bicarbonate dry powder fire extinguishing agent
General technical conditions for portable fire extinguishers
GB4402 Portable dry powder fire extinguishers
ZBC84006Ammonium phosphate dry powder fire extinguishing agent
GN11 Method for compiling fire protection product models
3 Types, specifications and basic parameters
3.1 Type
This type of fire extinguisher is a pressurized dry powder type.
The model compilation method of fire extinguishers shall be in accordance with the provisions of GN11. Marking example:
Nominal weight of dry powder filled (4kg)
Characteristic code of dry powder fire extinguishing agent
(L represents ammonium phosphate dry powder fire extinguishing agent)
Stored pressure type
Dry powder fire extinguishing agent
-fire extinguisher
Approved by the State Administration of Technical Supervision on November 6, 1990 and implemented on June 1, 1991
3.2 Specifications
GB12515-90
The specifications of fire extinguishers are divided according to the weight of dry powder filled, and the series specifications are divided into 8 types: 1, 2, (3), 4, 5, (6), 8 and 10kg. Note: The specifications in brackets should be avoided as much as possible. 3.3 Basic parameters
3.3.1 When the temperature of the fire extinguisher is 20±5℃, its performance parameters shall comply with the provisions of Table 1. Table 1
Weight of fire extinguishing agent, kg
Effective spraying time, s
Effective spraying distance, m
Spraying delay time, s
Spraying residual rate, %www.bzxz.net
Electrical insulation performance, kV
(3) kg
Note: The effective spraying distance refers to the horizontal distance from the top of the fire extinguisher nozzle to the most concentrated point of the fire extinguishing agent. (6)kg
108:28
3.3.2 The operating temperature range of the fire extinguisher shall comply with the provisions of Article 3.3.1 of GB4351. The recommended operating temperature range of this standard is 20~55℃.
The spray performance at the highest or lowest operating temperature shall meet the following requirements: The effective spray time shall not deviate more than ±25% from the effective spray time at 20±5℃ and shall not be less than 6s. The spray lag time shall not be more than 5s.
The spray residual rate shall not be more than 15%.
3.3.3 For fire extinguishers that can spray intermittently, the intermittent spray lag time shall not be more than 3s. 3.3.4 The fire extinguishing performance of the fire extinguisher shall meet the requirements of Article 3.4 of GB4351. 3.3.5 The total weight of the fire extinguisher shall not be more than 20kg. 4 Technical requirements
4.1 Mechanical strength
4.1.1 The cylinder of the fire extinguisher and the head under internal pressure and the connecting parts between the cylinder and the head shall be subjected to water pressure test in accordance with the requirements of Article 3.6.2 of GB4351.
4.1.2 The measured burst pressure of the fire extinguisher shall satisfy the result of the following calculation: P. ≥ 0. 95 2t : 0g
Wherein: P. —— measured burst pressure of the cylinder (gauge pressure), MPa; D.—external diameter of the cylinder, mm
g--tensile strength of the material at room temperature, N/mm2; t nominal wall thickness of the cylinder, mm.
The bursting hole of the cylinder shall be plastically damaged, and no fragments shall be produced during the bursting. The test method shall be in accordance with the provisions of Article 4.6.2 of GB4351. 4.1.3 The vibration resistance of the fire extinguisher shall comply with the provisions of Articles 3.6.4 and 3.6.5 of GB4351. 4.1.4 The impact resistance of the fire extinguisher shall comply with the provisions of Article 3.6.6 of GB4351. 4.2 Structure
GB12515—90
4.2.1 The requirements for the operating mechanism of the fire extinguisher shall comply with the provisions of Article 3.10.1 of GB4351. 4.2.2 The fire extinguisher shall be equipped with a pressure relief structure to ensure safe disassembly under hysteresis. 4.2.3 When the amount of dry powder filled in the fire extinguisher is greater than or equal to 4kg, it shall be equipped with an intermittent spraying mechanism and a spray hose. The sealing of the intermittent spraying mechanism shall be reliable and its requirements shall comply with the provisions of Article 3.5.3 of GB4351. The length of the spray hose shall not be less than 80% of the height of the fire extinguisher cylinder. The spray hose shall be a pressure-resistant and insulated braided hose. Its bursting pressure shall be greater than 3.5 times the maximum pressure it withstands when the fire extinguisher is in the working state of 60℃, and shall not be less than 3.0MPa. 4.2.4 The spray hose and joints shall have reliable connection strength and shall not be disconnected after a water pressure test of 1.5 times the design pressure or a tensile test of 400N.
4.2.5 The fire extinguisher shall be equipped with a device that can display the internal pressure, and its requirements shall comply with the provisions of Article 3.8 of GB4351. 4.3 Materials
4.3.1 The material of the steel cylinder of the fire extinguisher shall be made of calm steel and shall meet the requirements of the use temperature range. The chemical composition and mechanical properties of the material shall comply with the provisions of relevant national standards. 4.3.2 The main parts of the fire extinguisher such as the head can be made of materials such as copper alloy, aluminum alloy or stainless steel, and their chemical composition and mechanical properties shall comply with the provisions of relevant national standards.
4.3.3 The material properties of the rubber and plastic parts of the fire extinguisher shall comply with the provisions of Article 3.9 of GB4351. 4.3.4 The performance of dry powder used in fire extinguishers shall comply with the provisions of GB4066, ZBC84006 or relevant dry powder fire extinguishing agent standards. 4.3.5 Nitrogen used as a driving gas for fire extinguishers shall comply with the provisions of GB3864. 4.4 Manufacturing process
4.4.1 The body of the fire extinguisher can be manufactured by welding, drawing or spinning. 4.4.2 The weld of the fire extinguisher should be uniform, and there should be no visible cracks, pores, isolated pits, slag inclusions, incomplete penetration and incomplete fusion. For the body of the fire extinguisher using radiographic flaw detection, the weld flaw detection inspection should be carried out in accordance with GB3323, and the weld quality should meet the requirements of level 3. 4.4.3 The surface of sheet metal and stamping parts should be free of defects such as burrs, wrinkles and mechanical damage. 4.4.4 The surface of cast parts should be free of defects such as pores, slag inclusions, cracks and insufficient pouring. 4.4.5 The surface of forged parts shall be free of defects such as burrs, heavy skin and cracks. 4.4.6 The tolerance grade of the unnoted tolerance dimensions of metal parts shall comply with the provisions of IT14 in GB1804. The unnoted tolerance grade of non-metallic parts shall comply with the provisions of IT16 in GB1804. 4.4.7 The thread tolerance of parts shall comply with the provisions of 7H for internal threads and 8g for external threads in GB197. 4.4.8 The exterior of the fire extinguisher shall be treated with anti-corrosion, and its performance shall comply with the provisions of Article 3.7.1 of GB4351. The interior of the fire extinguisher shall be resistant to the corrosion of the fire extinguishing agent, and its performance shall comply with the provisions of Article 3.7.2 of GB4351. 4.5 Sealing performance
4.5.1 During the use of the fire extinguisher, there shall be no leakage at the joints. 4.5.2 The sealing performance of the fire extinguisher shall comply with the provisions of Article 3.5.2 of GB4351. 4.5.3 The body and head of the fire extinguisher should be able to withstand the airtightness test of the design pressure value without leakage. 4.6 Appearance quality
4.6.1 The outer surface coating of the fire extinguisher should be uniform in color, without obvious defects such as flow marks, cracks, bubbles, scratches and bruises. 4.6.2 The surface of the electroplated parts should be free of defects such as bubbles, obvious scratches and bruises. 4.6.3 The decals should be straight and flat, without missing edges or words, without obvious defects such as wrinkles and bubbles, and should not fall off after the external corrosion test. 5 Test method
5.1 Spray performance test: Install the fire extinguisher on the test stand, so that the center line of the nozzle is 1m vertically away from the ground, and then carry out the spray test.
5.1.1 The test methods for effective spray time, spray lag time and spray residual rate shall be in accordance with the provisions of Article 4.1.1 of GB4351. 5.1.2 The effective spray distance test shall be the same as 5.1.1. During the test, place 5 rows of powder receiving pans in front of the spray direction. Each row has 5 pans, with a size of 35cm×25cm×2cm. The centers of adjacent powder receiving pans are 50cm apart, and the placement direction should be consistent. After the continuous spray test, weigh the extinguishing agent in each row of powder receiving pans perpendicular to the spray direction of the fire extinguisher. The distance from the center of the group of powder receiving pans with the heaviest weight to the top of the nozzle is the effective spray distance (the test should be conducted indoors or outdoors without wind). 5.1.3 For fire extinguishers that can spray intermittently, the intermittent spray test method should comply with the provisions of Article 4.1.2 of GB4351. 5.2 The test method for the spray performance of fire extinguishers at the use temperature should comply with the provisions of Article 4.2 of GB4351. 5.3 The test method for the fire extinguishing performance of fire extinguishers should comply with the provisions of Article 4.3 or 4.4 of GB4351. 5.4 The water pressure test method for fire extinguishers shall comply with the provisions of Article 4.6.1 of GB4351. 5.5 The burst test method for fire extinguishers shall comply with the provisions of Article 4.6.2 of GB4351. 5.6 The performance test method for rubber and plastic parts shall comply with the provisions of Article 4.11 of GB4351. 5.7 The vibration test method shall comply with the provisions of Article 4.7 of GB4351. 5.8 The impact test method shall comply with the provisions of Article 4.8 of GB4351. 5.9 The corrosion test method shall comply with the provisions of Articles 4.9.1 and 4.9.3 of GB4351. 5.10 Fire extinguisher sealing performance test
5.10.1 The test method for the sealing performance of fire extinguishers shall comply with the provisions of Articles 4.5.2, 4.5.3 and 4.5.5 of GB4351. The manufacturer shall conduct an airtightness test on each fire extinguisher. 5.10.2 Immerse the fire extinguisher (without spray hose and nozzle) filled with fire extinguishing agent and driving gas in clean water with a water temperature of not less than 5℃. The water surface should be more than 50mm away from the top of the fire extinguisher. Keep it for 10 minutes and observe carefully. There should be no visible leakage bubbles in the fire extinguisher. 5.10.3 The body and head of the fire extinguisher that have passed the water pressure test are filled with compressed air or nitrogen at the design pressure value, and submerged in clean water with a water temperature of not less than 5℃. The water surface should be more than 50mm above the top of the tested parts. Keep it for 10 minutes and observe carefully. There should be no visible leakage bubbles.
5.11 The burst test method of the spray hose and joint shall be in accordance with the provisions of Article 4.13 of GB4351. The tensile test of the connection strength of the spray hose and joint can be measured by a tensile testing machine, or it can be replaced by a magnetic code load. The accuracy of the magnetic code should not be lower than grade 5. 5.12 The performance test method of the pressure gauge of the fire extinguisher shall comply with the provisions of Article 4.10 of GB4351. 5.13 The performance test method of the operating mechanism of the fire extinguisher shall comply with the provisions of Article 4.12 of GB4351. 5.14 The electrical insulation performance test of the fire extinguisher shall comply with the provisions of Article 3.14 of GB4402. 6 Inspection rules
6.1 Products shall be inspected by the quality inspection department of the manufacturer before leaving the factory to ensure that the products comply with the provisions of this standard. 6.2 The test sampling method and the evaluation of the results shall comply with the provisions of GB2828 and GB2829. 6.3 The inspection items of the fire extinguisher shall be as specified in Table 2. Table 2
Hydraulic pressure test
Inspection items
Fire extinguisher airtightness test
Fire extinguisher filling quantity inspection
Fire extinguisher appearance quality inspection
Spray performance test
Burst test
Spray hose and joint strength test
Using temperature spray performance test
Interval mechanism test
Main performance test of pressure gauge
7 Marking, packaging, transportation and storage
7.1 Marking
GB 12515—90
Continued Table 2
Inspection Items
Weld Quality Inspection
Performance Test of Rubber and Plastic Parts
Corrosion Test
Vibration Test
Impact Test
Operating Mechanism Test
Fire Extinguishing Test
Electrical Insulation Performance Test
Main Performance Test of Fire Extinguishing Agent
Purity and Water Content Test of Driving Gas
The Marking of Fire Extinguisher shall comply with the provisions of Chapter 6 of GB4351. Type
Full Inspection or Random Inspection (according to Design Requirements)
Inspection when Material and Process are Changed
Structure and Material
Inspection when Changed
7.2 Packaging
7.2.1 The packaging of the product shall ensure that it is not damaged or loose during normal transportation and shall comply with the needs of the user and the regulations of the transportation department. 7.2.2 The packaging of export products shall comply with the regulations on export packaging. The exterior of the packaging box shall have the following contents:
Product name and specification (or model);
Inner quantity (boxes);
Outer dimensions of the packaging box l×3×h (mm); Total weight (kg);
Product year and month or serial number;
Manufacturer name and address;
“Handle with care”, “Keep away from moisture”, “Strictly avoid exposure to sunlight” and other words or marks. 7.3 Transportation and storage
During transportation and storage, fire extinguishers should be kept away from being placed upside down, exposed to rain, exposed to the sun, strong radiation and contact with corrosive substances. 7.3.13
7.3.2 The storage temperature of fire extinguishers should be within the range of -10~～45℃. 8 Repair and maintenance
8.1 Maintenance of fire extinguishers during use
8.1.1 The place where the fire extinguisher is placed should be kept dry and ventilated to prevent moisture and corrosion of the cylinder. Sunlight exposure and strong radiant heat should be avoided to avoid affecting the normal use of the fire extinguisher.
8.1.2 Fire extinguishers should be inspected regularly according to the requirements and inspection cycles specified by the manufacturer. 8.1.3 The inspection of fire extinguishers should be carried out by trained personnel. 8.2 Repair and refilling of fire extinguishers
8.2.1 Once the fire extinguisher is opened, it must be refilled according to the specified requirements even if not much is sprayed out. Refilling should be carried out by professional maintenance departments according to the requirements and methods specified by the manufacturer. The type, weight and driving gas pressure of the fire extinguishing agent shall not be changed at will. 8.2.2 Every five years and before each refilling, the main pressure-bearing parts of the fire extinguisher, such as the head and cylinder, shall be subjected to a water pressure test in accordance with the provisions of Article 5.4 of this standard. Only those that pass the test can continue to be used. After the test, it should be dried in time and the inner wall should be checked for obvious rust. If the water pressure test fails, it is not allowed to be repaired and used by welding or other methods. 8.2.3 Fire extinguishers repaired by the maintenance department shall have a mark approved by the fire supervision department, and the name of the maintenance unit and the maintenance date shall be noted. 396
A1 Symbol
Si: calculated minimum wall thickness of cylinder, mm;
S2: calculated minimum wall thickness of head, mm;
Ph: hydraulic test pressure of cylinder (gauge pressure), MPa; gb: tensile strength of material at room temperature, N/mm2; : yield stress of material at room temperature, N/mm2; D: inner diameter of cylinder, mm;
R,: inner radius of spherical part of head, mm; Hi: height of inner convex surface of head, mm;
r: inner radius of corner of transition zone of head, mm; Z: weld coefficient;
K: shape coefficient of head;
h: height of straight edge of head, mm.
A2 Calculation of wall thickness
GB 12515—90
Appendix A
Calculation of wall thickness of fire extinguisher cylinder
(Supplement)
A2.1 The minimum wall thickness of the cylinder of the fire extinguisher is calculated according to formula (A1) St=
Where:, take the minimum value specified in the relevant material standard or the guaranteed value after heat treatment. A2.2 When there is no yield point α of the material in the corresponding standard. But only the tensile strength α, the minimum wall thickness of the cylinder is calculated according to formula (A2).
Op — P.
Where: take the minimum value specified in the standard or the guaranteed value after heat treatment. A2.3 Among the weld coefficients: the coefficient of the girth weld and the longitudinal weld for all radiographic flaw detection is 1.0; the coefficient of the longitudinal weld for local radiographic flaw detection should not be greater than 0.9; the coefficient of the longitudinal weld without radiographic flaw detection should not be greater than 0.8. A2.4 The minimum wall thickness of the head should not be less than the calculated minimum wall thickness of the cylinder (except for the head that is stretched integrally with the cylinder). The shape of the head should be elliptical, dished or hemispherical, and should meet the following conditions: a. See Figure A1a for elliptical heads; b. See Figure A1b for dished heads; The straight edge height h of the head should not be less than 10mm. 397
GB12515—90
A2.5 The calculated minimum wall thickness of the head shall be calculated according to formula (A3). S2—
Ph· D,K
r>0. 1 D,
When there is no yield point of the material in the corresponding standard but only tensile strength, the minimum wall thickness of the head is calculated according to formula (A4). S
. (A4)
Where: The shape coefficient K of the standard elliptical head (H-0.25D) is equal to 1: The shape coefficients of other heads can be found from Figure A2; 0. The values of and α are selected in the same way as in A2.1 and A2.2. 398
GB12515-90
S,/ D,
0.25H+ D.
a Applicable to the ratio H,/D, between 0.20 and 0.250. s
b Applicable to the ratio H/D, between 0.25 and 0.50 Figure A2
A2.6 The actual thickness of the shell and the head should also take into account the negative deviation of the steel plate and the process thinning amount. 0. 50H,/D.
Additional Notes:
12515--90
This standard is proposed by the Ministry of Public Security of the People's Republic of China. This standard is under the jurisdiction of the National Fire Protection Standardization Technical Committee. This standard is drafted by the Shanghai Fire Science Research Institute of the Ministry of Public Security. The main drafters of this standard are Mei Rusong, Li Yuewei, Kang Hongxiang, Dai Guoding. This standard mainly refers to ISO/DP7165 portable fire extinguishers and UL299 dry powder fire extinguishers. 400
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