This standard specifies the performance requirements and test methods for firefighting interfaces. This standard applies to fire hose interfaces, fire suction pipe interfaces, and interfaces configured on fire hydrants, fire hydrant connectors, fire pumps, water pump couplers, water distributors, water collectors, fire hoses and other firefighting equipment, as well as various reducing interfaces, special-shaped interfaces, and interface covers. This standard does not apply to steel hose interfaces. GB 12514-1990 Firefighting Interface Performance Requirements and Test Methods GB12514-1990 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Performance requirements and test methods for fire coupling
1 Subject content and scope of application
This standard specifies the performance requirements and test methods for fire couplings. GB 12514—90
This standard applies to fire hose couplings, fire suction pipe couplings, and couplings configured on fire hydrants, fire hydrant connectors, fire pumps, water pump couplers, water distributors, water collectors, fire hoses and other fire fighting equipment, as well as various reducing couplings, special-shaped couplings, and coupling covers (hereinafter referred to as couplings).
This standard does not apply to steel hose couplings. 2 Reference standards
Ordinary thread tolerances and fits (diameter 1~~355mm) GB197
GB 1048
Nominal pressure and test pressure of pipes and pipeline accessories GB1173
Technical conditions for cast aluminum alloys
GB1176
Technical conditions for cast copper alloys
GB1804
Tolerances and fits Limit deviations and basic parameters of dimensions without tolerances
GB3265 Internal buckle fire protection interface
Gray cast iron parts
GB9439
3 Terms
3.1 Internal buckle interface
An interface that relies on two pairs of claws to connect with the inner slide. 3.2 Threaded interface
An interface that relies on threads to connect the inner and outer interfaces. 3.3 Special-shaped interface
Interface used for transitional connection between two different types of interfaces. 3.4 External hoop connection
Refers to the form in which the hose or suction pipe is sleeved outside the tail of the interface and is firmly connected to the interface by metal wire, deformation ring or other forms. 3.5 Internal expansion connection
Refers to the form in which the hose and suction pipe are placed on the inner wall of the tail of the interface and are firmly connected to the interface by means of a deformation ring. 4 Performance requirements
4.1 Basic dimensions
4.1.1 The specifications of the interface, the minimum diameter and the dimensions of the connection between the interface and the hose and suction pipe shall comply with the requirements of Table 1. Approved by the State Administration of Technical Supervision on November 6, 1990 386
Implemented on June 1, 1991
GB12514-90
4.1.2 The thread sizes of cylindrical pipes connected to the interfaces and fire hydrants, fire hydrant connectors, fire pumps, water pump adapters, water distributors, water collectors, fire hoses and other fire fighting equipment shall comply with the provisions of Table 2. 4.1.3 The thread sizes of the connection between threaded interfaces shall comply with the provisions of Table 3. 4.1.4 The connection sizes between buckle interfaces shall comply with the provisions of GB3265-82 4.1.5 The limit deviations of the dimensions without tolerance in Tables 1 to 3 shall be manufactured according to the 14-level precision in GB180479. Table 1
Dimensions of the connection between the interface and the hose
Minimum diameter
External hoop type
Inner diameter of internal expansion
Type
After connecting with the hose
, the diameter of the connection part
is not smaller
than the corresponding inner diameter of the hose
Minimum diameter
Minimum diameter
Connection length
Interface and suction pipe Connection part size
Straight type
Cylindrical pipe thread size
Expanded type
Minimum connection length
Thread length
Connecting thread between threaded interfaces
Thread size
M100×6
M125×6
Thread length
4.2 Appearance quality
Minimum drift diameter
GB 12514—90
Continued Table 3
Connecting thread between threaded interfaces
Thread size
M125×6
M150×6
M170×6
4.2.1 The casting surface should be free of scars, cracks, sand holes, and the machined surface should be free of scratches. Thread length
4.2.2 The thread surface of the interface should be smooth and without damaged teeth. The incomplete tooth shape at the beginning and end of the threaded interface head should be trimmed to a tooth height of more than 1.
4.2.3 The sharp angles of the interface and the hose and suction pipe connection parts should be blunt. 4.3 Operating torque
4.3.1 After the interfaces are connected in pairs, they shall be tested in accordance with the provisions of Article 5.3. The operating torque shall be within the range of 0.5 to 2.5 N·m. 4.4 Sealing performance
4.4.1 After the suction pipe interfaces are connected in pairs, they shall be tested in accordance with the provisions of Article 5.4.1. There shall be no leakage under a water pressure of 0.45 MPa. 4.4.2 After the interfaces other than the suction pipe interfaces are connected in pairs, they shall be tested in accordance with the provisions of Article 5.4.2. There shall be no leakage under a water pressure of 0.3 MPa and 1.6 MPa. When this test is performed on internal and external threaded fixed interfaces, corresponding interface caps or pipe thread interfaces can be used to connect them.
4.5 Water pressure strength
4.5.1 After the suction pipe interfaces are connected in pairs, they shall be tested in accordance with the provisions of Article 5.5. No cracks or fractures shall occur under a water pressure of 1.0MPa. 4.5.2 After the interfaces other than the suction pipe interfaces are connected in pairs, they shall be tested in accordance with the provisions of Article 5.5. No cracks or fractures shall occur under a water pressure of 2.4MPa. When this test is performed on internal and external threaded fixed interfaces, corresponding interface caps or pipe thread interfaces can be used to connect them.
4.5.3 After the water pressure strength test, the interface shall be able to operate normally. 4.6 Connection force between interface and hose
4.6.1 For the interface connected to the hose by the deformation of the deformation ring, when tested in accordance with the provisions of Article 5.6, there should be no leakage at the connection between the interface and the hose under a water pressure of 1.6MPa. The hose should not fall off the interface under a water pressure of 2.4MPa. 4.7 Drop resistance
4.7.1 When tested in accordance with the provisions of Article 5.7, the hose interface and the suction pipe interface should not be damaged after free falling from a height of 1.50m for 5 times, and can operate normally.
4.8 Corrosion resistance
4.8.1 The interface should be made of corrosion-resistant materials; the surface of aluminum alloy castings should be anodized. 4.8.2 According to the provisions of Article 5.8, after the interface is subjected to a 96h continuous spray salt spray corrosion test, the sample should have no delamination, oxidation, peeling or pitting pits visible to the naked eye.
4.8.3 The interface should be able to operate normally after the corrosion resistance test. 4.9 Materials
4.9.1 Aluminum castings should use the aluminum-silicon alloy specified in GB1173-74, and the inner buckle interface body using cast aluminum should use ZL104. Or other aluminum materials with mechanical properties not lower than the aforementioned aluminum-silicon alloy. 4.9.2 Copper castings should use tin bronze specified in GB1176-74, or other copper materials with mechanical properties not lower than tin bronze. 4.9.3 The mechanical properties of iron castings should comply with the provisions of GB9439-88. 4.9.4 The rubber seal on the interface should be oil-resistant rubber. 388
5 Test methods
5.1 Connection dimensions
GB 12514-90
5.1.1 Check the size of the sample with a vernier caliper. The measured value is taken to 2 decimal places, and the decimal places below 2 are rounded off. The accuracy of the vernier caliper shall not be less than 0.02mm.
5.1.2 Check the size of the thread with a thread ring gauge. The accuracy of the cylindrical pipe thread ring gauge shall not be less than grade 3; the accuracy of the metric thread ring gauge shall not be less than grade 7H, 8g.
5.2 Appearance quality
5.2.1 Check the appearance with the naked eye, which shall meet the requirements of Article 4.2. 5.3 Operating torque test
Install the connected paired inner buckle interface specimens on the test bench, and rotate one specimen evenly and slowly without applying axial force until the specimen is released. Measure the maximum torque during the release of the specimen. Repeat 3 times, and the arithmetic mean is the operating torque of the specimen. The test results shall meet the requirements of Article 4.3. 5.4 Water pressure sealing test
5.4.1 Clamp the connected paired suction pipe interface samples on the water pressure test bench, fill with water and remove the air in the samples, slowly and evenly increase the pressure to 0.45MPa within 2 minutes, and maintain the pressure for 2 minutes. The test results should comply with the provisions of Article 4.4.1. 5.4.2 For other interface samples other than the suction pipe interface, increase the water pressure to 0.3MPa and 1.6MPa using the method in Article 5.4.1, and maintain the pressure for 2 minutes each, and observe the condition of the sample during the pressure maintenance process. The test results should comply with the provisions of Article 4.4.2. 5.4.3 The test device should comply with the provisions of Article 5.5.2. 5.5 Water pressure strength testwww.bzxz.net
5.5.1 Increase the pressure to 4.5.1 or 4.5. according to the provisions of 5.4.1.2. Maintain the pressure for 2 minutes. The test result shall comply with the provisions of Article 4.5. This test can be carried out immediately after the water pressure sealing test. 5.5.2 The test device shall comply with the following provisions. 5.5.2.1 The rated working pressure of the water pressure source shall not be lower than the corresponding water pressure strength pressure of the specimen. 5.5.2.2 When the water pressure in the system is not greater than 3.0MPa, the pressure fluctuation value displayed by the pressure display shall not exceed ±0.03.MPa. 5.5.2.3 The lower limit of the pressure display is 0MPa, the upper limit is 4.0 or 6.0MPa, and the accuracy is not less than ±1.5%. 5.5.2.4 The structure of the test bench shall ensure that the stress state and sealing conditions of the specimen during the test are consistent with those during actual operation. The test bench should be equipped with an exhaust device.
5.6 Connection force test between interface and hose
5.6.1 The interface manufacturer shall provide a sample with the interface and the lined hose clamped by a deformation ring. The length of each hose section shall not be less than 0.5m.
5.6.2 Clamp the hose on the water pressure test bench, fill it with water and remove the air in the sample, slowly and evenly increase the pressure to 1.6MPa, maintain the pressure for 2 minutes, and the test results shall comply with the corresponding provisions of Article 4.6.1. 5.6.3 After the test of Article 5.6.2 is completed, continue to slowly increase the pressure to 2.4MPa water pressure, maintain the pressure for 2 minutes, and the test results shall comply with the corresponding provisions of Article 4.6.1.
5.7 Drop test
5.7.1 The number of samples and their hanging methods are as follows: 2 claws of the inner buckle interface sample are downward;
One pair of connected threaded interface samples, with the axis in a horizontal state. 5.7.2 Clamp the sample on the test frame according to the provisions of 5.7.1, so that the distance from the lowest point of the sample to the base is 1.50 ± 0.05m. After the sample is stationary, let it fall freely on the base. Repeat the test 5 times for each sample, and the result should meet the requirements of 4.7. 5.7.3 The base of the test frame is a reinforced concrete platform with a thickness of 10cm. 5.8 Corrosion resistance test
5.8.1 Sample
GB12514-90
5.8.1.1 Disassemble the sample before the test, first wash each part with a neutral solution, then rinse with clean water, and reassemble the sample after the parts are dry. Snap the sample together 100 times continuously. Keep the sample clean during the operation so that the sample is no longer contaminated. 5.8.1.2 Take 2 pairs of samples, one of which is in a mutually connected state. Hang the samples vertically in the salt spray test chamber, with the inner interface of the connected sample at the top and the mutually connected ends of the other samples facing upward. 5.8.1.3 After completing the test cycle of 96h, first check whether the two interfaces can operate normally. Then take out the sample, dry it indoors for 1h, rinse it with clean water not exceeding 40℃, and check the surface condition of the sample after drying. The results should comply with the provisions of Article 4.8. 5.8.2 Test conditions
The test conditions of the salt spray corrosion test should meet the following requirements: a.
The concentration of the salt solution is 501g/L;
The pH value of the salt solution at 35℃ should be maintained in the range of 6.5~7.2; b.
Salt spray deposition rate is 1.0~2.0mL/h (within the horizontal collection area of ​​80cm2); c.
The temperature of the effective test space in the salt spray test chamber should be 35±2℃; d.
6 mark
Continuous spraying within 96h.
The model, specification, trademark (or factory name) should be clearly cast in a conspicuous place on the interface surface. Additional remarks:
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 was drafted by the Shanghai Fire Protection Research Institute of the Ministry of Public Security. The main drafters of this standard are Xiong Zhuxiao, Hu Chuanping, Jin Yizhong, Pan Yinsu, and Xu Yaoliang. This standard mainly refers to the American ANSI/UL236-82 "Fire Hose Interface" and the Japanese Autonomous Province Order No. 5 in 1978 revised "Inserted Fire Hose Interface Technical Standard" and "Threaded Fire Hose or Suction Pipe Interface Technical Standard" and 1984 "Inserted Fire Hose Interface Verification Detailed Rules" and "Threaded Fire Hose or Suction Pipe Interface Verification Detailed Rules". 390
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